cannot load such file -- mysql2/2.4/mysql2 (LoadError)`

[araufit]

I am new on Ruby on Rails. My Ruby version is ruby2.4.1p111 (2017-03-22 revision 58053) [x64-mingw32].

I have created a new project using rails new sample_cms -d mysql command.

The command rails server is throwing following error.

C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/mysql2-0.4.6-x64-mingw32/lib/mysql2/mysql2.rb:2:inrequire': cannot load such file -- mysql2/2.4/mysql2 (LoadError)`
I have installed mysql and mysql Connector C. I have installed the mysql2 gem like that.

gem install mysql2 —platform=ruby — ‘—with-mysql-dir="C:\Program Files\MySQL\MySQL Connector C 6.1"’
I have uninstall and install the mysql2 gem but still facing the issue. Here is the directory which may have issue.

Here is the gem file entry for mysql2

Bundle edge Rails instead: gem 'rails', github: 'rails/rails'

gem 'rails', '~> 5.1.1'

Use mysql as the database for Active Record

gem 'mysql2', '>= 0.3.18', '< 0.5'

Use Puma as the app server

gem 'puma', '~> 3.7'
Any Help?

[sodabrew]

There is no mysql2 binary for Ruby 2.4 for Windows available at this time. You could compile it on your own at this time. At some point in the future I will have this in the public packages, but that will not happen on any immediate schedule.

[araufit]

@sodabrew .. How can i compile it. Can you please guide me to any tutorial or procedure?

[wjh94]

I'm also having problem in using mysql2 gem in Ruby 2.4. The binary is not listed inside the gem directory, and googling takes me here. I have tried downloading the source code, building the gem by using **gem build** _mysql2.gemspec_, then install it by providing the mysql connector location -since that I'm using 32-bit version of Ruby inside 64-bit Windows-, and then I got this error. Any idea on how to compile it properly?

E:\mysql2-0.4.6>gem install .\mysql2-0.4.6.gem --platform ruby -- '--with-mysql-dir="C:/Program Files (x86)/MySQL/MySQL Connector C 6.1"'
Temporarily enhancing PATH for MSYS/MINGW...
Building native extensions with: '--with-mysql-dir="C:/Program Files (x86)/MySQL/MySQL Connector C 6.1"'
This could take a while...
ERROR:  Error installing .\mysql2-0.4.6.gem:
        ERROR: Failed to build gem native extension.

    current directory: E:/ruby24x86/lib/ruby/gems/2.4.0/gems/mysql2-0.4.6/ext/mysql2
E:/ruby24x86/bin/ruby.exe -r ./siteconf20170625-6748-g1m887.rb extconf.rb --with-mysql-dir="C:/Program Files (x86)/MySQL/MySQL Connector C 6.1"
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
checking for rb_big_cmp()... yes
-----
Using --with-mysql-dir=C:/Program Files (x86)/MySQL/MySQL Connector C 6.1
-----
checking for mysql.h... yes
checking for SSL_MODE_DISABLED in mysql.h... yes
checking for SSL_MODE_PREFERRED in mysql.h... yes
checking for SSL_MODE_REQUIRED in mysql.h... yes
checking for SSL_MODE_VERIFY_CA in mysql.h... yes
checking for SSL_MODE_VERIFY_IDENTITY in mysql.h... yes
checking for errmsg.h... yes
checking for mysqld_error.h... yes
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers.  Check the mkmf.log file for more details.  You may need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=E:/ruby24x86/bin/$(RUBY_BASE_NAME)
        --with-mysql-dir
        --with-mysql-include
        --without-mysql-include=${mysql-dir}/include
        --with-mysql-lib
        --without-mysql-lib=${mysql-dir}/lib
        --with-sanitize
        --without-sanitize
E:/ruby24x86/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task_manager.rb:58:in `[]': Don't know how to build task 'E:/ruby24x86/lib/ruby/gems/2.4.0/gems/mysql2-0.4.6/support/libmysql.def' (see --tasks) (RuntimeError)
        from E:/ruby24x86/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:61:in `lookup_prerequisite'
        from E:/ruby24x86/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:57:in `block in prerequisite_tasks'
        from E:/ruby24x86/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:57:in `map'
        from E:/ruby24x86/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:57:in `prerequisite_tasks'
        from E:/ruby24x86/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:214:in `invoke_prerequisites'
        from E:/ruby24x86/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:193:in `block in invoke_with_call_chain'

        from E:/ruby24x86/lib/ruby/2.4.0/monitor.rb:214:in `mon_synchronize'
        from E:/ruby24x86/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:187:in `invoke_with_call_chain'
        from E:/ruby24x86/lib/ruby/gems/2.4.0/gems/rake-12.0.0/lib/rake/task.rb:180:in `invoke'
        from extconf.rb:197:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  E:/ruby24x86/lib/ruby/gems/2.4.0/extensions/x86-mingw32/2.4.0/mysql2-0.4.6/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in E:/ruby24x86/lib/ruby/gems/2.4.0/gems/mysql2-0.4.6 for inspection.
Results logged to E:/ruby24x86/lib/ruby/gems/2.4.0/extensions/x86-mingw32/2.4.0/mysql2-0.4.6/gem_make.out

The content of mkmf.log file is shown as below:

have_func: checking for rb_absint_size()... -------------------- yes

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main(int argc, char **argv)
6: {
7:   return 0;
8: }
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_absint_size; return !p; }
/* end */

--------------------

have_func: checking for rb_absint_singlebit_p()... -------------------- yes

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_absint_singlebit_p; return !p; }
/* end */

--------------------

have_header: checking for ruby/thread.h... -------------------- yes

"i686-w64-mingw32-gcc -E -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <ruby/thread.h>
/* end */

--------------------

have_func: checking for rb_thread_call_without_gvl() in ruby/thread.h... -------------------- yes

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: #include <ruby/thread.h>
 6: 
 7: /*top*/
 8: extern int t(void);
 9: int main(int argc, char **argv)
10: {
11:   if (argc > 1000000) {
12:     printf("%p", &t);
13:   }
14: 
15:   return 0;
16: }
17: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_thread_call_without_gvl; return !p; }
/* end */

--------------------

have_func: checking for rb_thread_blocking_region()... -------------------- no

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
conftest.c: In function 't':
conftest.c:16:57: error: 'rb_thread_blocking_region' undeclared (first use in this function)
 int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_thread_blocking_region; return !p; }
                                                         ^~~~~~~~~~~~~~~~~~~~~~~~~
conftest.c:16:57: note: each undeclared identifier is reported only once for each function it appears in
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_thread_blocking_region; return !p; }
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
C:\Users\jianh\AppData\Local\Temp\cc8qbCYP.o:conftest.c:(.text+0x4): undefined reference to `rb_thread_blocking_region'
collect2.exe: error: ld returned 1 exit status
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: extern void rb_thread_blocking_region();
17: int t(void) { rb_thread_blocking_region(); return 0; }
/* end */

--------------------

have_func: checking for rb_wait_for_single_fd()... -------------------- yes

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
conftest.c: In function 't':
conftest.c:16:57: error: 'rb_wait_for_single_fd' undeclared (first use in this function)
 int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_wait_for_single_fd; return !p; }
                                                         ^~~~~~~~~~~~~~~~~~~~~
conftest.c:16:57: note: each undeclared identifier is reported only once for each function it appears in
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_wait_for_single_fd; return !p; }
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: extern void rb_wait_for_single_fd();
17: int t(void) { rb_wait_for_single_fd(); return 0; }
/* end */

--------------------

have_func: checking for rb_hash_dup()... -------------------- yes

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_hash_dup; return !p; }
/* end */

--------------------

have_func: checking for rb_intern3()... -------------------- yes

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
conftest.c: In function 't':
conftest.c:16:57: error: 'rb_intern3' undeclared (first use in this function)
 int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_intern3; return !p; }
                                                         ^~~~~~~~~~
conftest.c:16:57: note: each undeclared identifier is reported only once for each function it appears in
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_intern3; return !p; }
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: extern void rb_intern3();
17: int t(void) { rb_intern3(); return 0; }
/* end */

--------------------

have_func: checking for rb_big_cmp()... -------------------- yes

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include conftest.c  -L. -LE:/ruby24x86/lib -L. -pipe     -lmsvcrt-ruby240  -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
 1: #include "ruby.h"
 2: 
 3: #include <winsock2.h>
 4: #include <windows.h>
 5: 
 6: /*top*/
 7: extern int t(void);
 8: int main(int argc, char **argv)
 9: {
10:   if (argc > 1000000) {
11:     printf("%p", &t);
12:   }
13: 
14:   return 0;
15: }
16: int t(void) { void ((*volatile p)()); p = (void ((*)()))rb_big_cmp; return !p; }
/* end */

--------------------

have_header: checking for mysql.h... -------------------- yes

"i686-w64-mingw32-gcc -E -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <mysql.h>
/* end */

--------------------

have_const: checking for SSL_MODE_DISABLED in mysql.h... -------------------- yes

"i686-w64-mingw32-gcc -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include   -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <mysql.h>
6: 
7: /*top*/
8: typedef int conftest_type;
9: conftest_type conftestval = (int)SSL_MODE_DISABLED;
/* end */

--------------------

have_const: checking for SSL_MODE_PREFERRED in mysql.h... -------------------- yes

"i686-w64-mingw32-gcc -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include   -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <mysql.h>
6: 
7: /*top*/
8: typedef int conftest_type;
9: conftest_type conftestval = (int)SSL_MODE_PREFERRED;
/* end */

--------------------

have_const: checking for SSL_MODE_REQUIRED in mysql.h... -------------------- yes

"i686-w64-mingw32-gcc -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include   -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <mysql.h>
6: 
7: /*top*/
8: typedef int conftest_type;
9: conftest_type conftestval = (int)SSL_MODE_REQUIRED;
/* end */

--------------------

have_const: checking for SSL_MODE_VERIFY_CA in mysql.h... -------------------- yes

"i686-w64-mingw32-gcc -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include   -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <mysql.h>
6: 
7: /*top*/
8: typedef int conftest_type;
9: conftest_type conftestval = (int)SSL_MODE_VERIFY_CA;
/* end */

--------------------

have_const: checking for SSL_MODE_VERIFY_IDENTITY in mysql.h... -------------------- yes

"i686-w64-mingw32-gcc -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include   -c conftest.c"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <mysql.h>
6: 
7: /*top*/
8: typedef int conftest_type;
9: conftest_type conftestval = (int)SSL_MODE_VERIFY_IDENTITY;
/* end */

--------------------

have_header: checking for errmsg.h... -------------------- yes

"i686-w64-mingw32-gcc -E -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <errmsg.h>
/* end */

--------------------

have_header: checking for mysqld_error.h... -------------------- yes

"i686-w64-mingw32-gcc -E -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT  conftest.c -o conftest.i"
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: #include <mysqld_error.h>
/* end */

--------------------

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Weverything -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
i686-w64-mingw32-gcc: error: unrecognized command line option '-Weverything'
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-bad-function-cast -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-conditional-uninitialized -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-covered-switch-default -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-declaration-after-statement -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-disabled-macro-expansion -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-documentation-unknown-command -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-missing-field-initializers -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-missing-variable-declarations -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-padded -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-reserved-id-macro -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-sign-conversion -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-static-in-inline -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-switch-enum -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-undef -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-unreachable-code -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

"i686-w64-mingw32-gcc -o conftest.exe -IE:/ruby24x86/include/ruby-2.4.0/i386-mingw32 -IE:/ruby24x86/include/ruby-2.4.0/ruby/backward -IE:/ruby24x86/include/ruby-2.4.0 -I. "-IC:/Program Files (x86)/MySQL/MySQL Connector C 6.1/include" -D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048 -IC:/msys64/mingw32/lib/libffi-3.2.1/include -D_WIN32_WINNT=0x0501 -D__MINGW_USE_VC2005_COMPAT -D_FILE_OFFSET_BITS=64  -march=i686 -mtune=generic -O2 -pipe -IC:/msys64/mingw32/lib/libffi-3.2.1/include -DFULL_SSL_MODE_SUPPORT conftest.c  -L. -LE:/ruby24x86/lib -L"C:/Program Files (x86)/MySQL/MySQL Connector C 6.1/lib" -L. -pipe     -lmsvcrt-ruby240 -Werror -Wno-used-but-marked-unused -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi  "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <winsock2.h>
4: #include <windows.h>
5: int main() {return 0;}
/* end */

[araufit]

@wjh94. I have the same issue but i have not compile it. I have revert back too ruby 2.3 and used 2.3 mysql2.

[sodabrew]

Using Ruby 2.3 is your best bet right now.

[sodabrew]

The 0.5.0 series will include Ruby 2.4 for Windows.

[laoyouzi]

I have the same issue, my ruby version is 2.2.1. but my os is ubuntu 16.04