compile error in serial1.c on MacOS

[hexabyte23]

hello,

Get this error when trying to build_iso.sh on MacOS

-- Configuring done
-- Generating done
-- Build files have been written to: /Users/thierry/Dev/barebones/machines/default/build
Scanning dependencies of target exceptions
Scanning dependencies of target tinyprintf
[ 7%] Building C object ext/CMakeFiles/tinyprintf.dir/tinyprintf/tinyprintf.c.o
[ 7%] Creating directories for 'exceptions'
[ 11%] Performing download step (download, verify and extract) for 'exceptions'
-- Downloading...
dst='/Users/thierry/Dev/barebones/machines/default/build/exceptions/src/exceptions.zip'
timeout='none'
-- Using src='https://github.com/fwsGonzo/barebones/releases/download/exceptions/exceptions.zip'
[ 14%] Linking C static library libtinyprintf.a
[ 14%] Built target tinyprintf
Scanning dependencies of target kernel
[ 25%] Building C object src/CMakeFiles/kernel.dir/hw/serial1.c.o
[ 25%] Building C object src/CMakeFiles/kernel.dir/crt/c_abi.c.o
[ 25%] Building C object src/CMakeFiles/kernel.dir/kernel/kernel_start.c.o
/Users/thierry/Dev/barebones/src/hw/serial1.c:4:48: error: argument to 'section' attribute is not valid for this target: mach-o section specifier requires a segment and
section separated by a comma
static char initialized attribute((section(".data"))) = 0;
^
1 error generated.
make[2]: *** [src/CMakeFiles/kernel.dir/hw/serial1.c.o] Error 1
make[2]: *** Waiting for unfinished jobs....
/Users/thierry/Dev/barebones/src/kernel/kernel_start.c:6:13: warning: unused function '__init_paging' [-Wunused-function]
static void __init_paging()
^
1 warning generated.

[fwsGonzo]

Hey, the reason for that was because .bss was initialized pretty late. So, I just pushed a change where .bss (basically, the whole section needs to be zeroed) will now be initialized early on in the assembly.

See: 0064e3d

macOS is not exactly supported, as I don't have a mac. Still, hope that helps. I don't really expect this setup to work on mac, but it would be nice if it did.

[hexabyte23]

Yes, that fix section problem, but after installing NASM with brew, got this new errors:

Jarvis2:barebones thierry$ ./run.sh
~/Dev/barebones/machines/default ~/Dev/barebones
~/Dev/barebones/machines/default/build ~/Dev/barebones/machines/default ~/Dev/barebones
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/thierry/Dev/barebones/machines/default/build
[ 25%] Built target tinyprintf
[ 37%] Built target exceptions
[ 51%] Building CXX object src/CMakeFiles/kernel.dir/kernel/tls.cpp.o
[ 51%] Building C object src/CMakeFiles/kernel.dir/crt/c_stubs.c.o
[ 51%] Building ASM_NASM object src/CMakeFiles/kernel.dir/kernel/start.asm.o
[ 51%] Building CXX object src/CMakeFiles/kernel.dir/kernel/elf.cpp.o
/Users/thierry/Dev/barebones/src/kernel/start.asm:17: error: unknown section name

/Users/thierry/Dev/barebones/src/kernel/start.asm:17: error: segment name `.multiboot' not recognized
make[2]: *** [src/CMakeFiles/kernel.dir/kernel/start.asm.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from /Users/thierry/Dev/barebones/src/kernel/elf.cpp:1:
/Users/thierry/Dev/barebones/src/kernel/elf.hpp:2:10: fatal error: 'elf.h' file
not found
#include <elf.h>
^~~~~~~
/Users/thierry/Dev/barebones/src/crt/c_stubs.c:4:10: fatal error: 'link.h' file
not found
#include <link.h>
^~~~~~~~
1 error generated.
make[2]: *** [src/CMakeFiles/kernel.dir/crt/c_stubs.c.o] Error 1
/Users/thierry/Dev/barebones/src/kernel/tls.cpp:9:45: error: argument to
'section' attribute is not valid for this target: mach-o section specifier
requires a segment and section separated by a comma
struct tls_table tls attribute((section(".data")));
^
1 error generated.
make[2]: *** [src/CMakeFiles/kernel.dir/kernel/tls.cpp.o] Error 1
1 error generated.
make[2]: *** [src/CMakeFiles/kernel.dir/kernel/elf.cpp.o] Error 1
make[1]: *** [src/CMakeFiles/kernel.dir/all] Error 2
make: *** [all] Error 2

[fwsGonzo]

What happens if you try building with Clang? You will probably have to download elf.h and link.h yourself, as I dont think I will be adding those manually into the repo. Although, I could do without link.h and just create the prototype for the stub myself, and then do provide elf.h. In the end, you do need a compiler that builds for linux and not macOS. Clang can do that with -target.

[hexabyte23]

I clean build dir then call run.sh again, and in fact it seems that I already used Clang compiler, but Apple version one...

Jarvis2:barebones thierry$ ./run.sh
~/Dev/barebones/machines/default ~/Dev/barebones
~/Dev/barebones/machines/default/build ~/Dev/barebones/machines/default ~/Dev/barebones
-- The C compiler identification is AppleClang 10.0.1.10010046
-- The CXX compiler identification is AppleClang 10.0.1.10010046
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- The ASM_NASM compiler identification is NASM
-- Found assembler: /usr/local/bin/nasm
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/thierry/Dev/barebones/machines/default/build
Scanning dependencies of target exceptions
Scanning dependencies of target tinyprintf
[ 7%] Building C object ext/CMakeFiles/tinyprintf.dir/tinyprintf/tinyprintf.c.o
[ 7%] Creating directories for 'exceptions'
[ 11%] Performing download step (download, verify and extract) for 'exceptions'
-- Downloading...
dst='/Users/thierry/Dev/barebones/machines/default/build/exceptions/src/exceptions.zip'
timeout='none'
-- Using src='https://github.com/fwsGonzo/barebones/releases/download/exceptions/exceptions.zip'
[ 14%] Linking C static library libtinyprintf.a
[ 14%] Built target tinyprintf
Scanning dependencies of target kernel
[ 25%] Building C object src/CMakeFiles/kernel.dir/hw/serial1.c.o
[ 25%] Building C object src/CMakeFiles/kernel.dir/crt/c_abi.c.o
[ 25%] Building C object src/CMakeFiles/kernel.dir/kernel/kernel_start.c.o
/Users/thierry/Dev/barebones/src/kernel/kernel_start.c:6:13: warning: unused function '__init_paging' [-Wunused-function]
static void __init_paging()
^
1 warning generated.
[ 29%] Building C object src/CMakeFiles/kernel.dir/crt/c_stubs.c.o
[ 33%] Building C object src/CMakeFiles/kernel.dir/crt/heap.c.o
[ 37%] Building C object src/CMakeFiles/kernel.dir/crt/malloc.c.o
/Users/thierry/Dev/barebones/src/crt/c_stubs.c:4:10: fatal error: 'link.h' file not found
#include <link.h>
^~~~~~~~
1 error generated.
make[2]: *** [src/CMakeFiles/kernel.dir/crt/c_stubs.c.o] Error 1
make[2]: *** Waiting for unfinished jobs....
/Users/thierry/Dev/barebones/src/crt/malloc.c:23:13: warning: 'sbrk' is deprecated [-Wdeprecated-declarations]
b = sbrk(word_align(sizeof(struct chunk)));
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/unistd.h:585:1: note: 'sbrk' has been explicitly
marked deprecated here
__deprecated __WATCHOS_PROHIBITED __TVOS_PROHIBITED
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/sys/cdefs.h:176:40: note: expanded from macro
'__deprecated'
#define __deprecated attribute((deprecated))
^
/Users/thierry/Dev/barebones/src/crt/malloc.c:70:22: warning: 'sbrk' is deprecated [-Wdeprecated-declarations]
Chunk newc = sbrk(length);
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/unistd.h:585:1: note: 'sbrk' has been explicitly
marked deprecated here
__deprecated __WATCHOS_PROHIBITED __TVOS_PROHIBITED
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/sys/cdefs.h:176:40: note: expanded from macro
'__deprecated'
#define __deprecated attribute((deprecated))
^
/Users/thierry/Dev/barebones/src/crt/malloc.c:88:46: warning: 'sbrk' is deprecated [-Wdeprecated-declarations]
if (!ptr || ptr < malloc_base() || ptr > sbrk(0)) return;
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/unistd.h:585:1: note: 'sbrk' has been explicitly
marked deprecated here
__deprecated __WATCHOS_PROHIBITED __TVOS_PROHIBITED
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/sys/cdefs.h:176:40: note: expanded from macro
'__deprecated'
#define __deprecated attribute((deprecated))
^
/Users/thierry/Dev/barebones/src/crt/malloc.c:101:9: warning: 'sbrk' is deprecated [-Wdeprecated-declarations]
sbrk(- c->size - sizeof(struct chunk));
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/unistd.h:585:1: note: 'sbrk' has been explicitly
marked deprecated here
__deprecated __WATCHOS_PROHIBITED __TVOS_PROHIBITED
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/sys/cdefs.h:176:40: note: expanded from macro
'__deprecated'
#define __deprecated attribute((deprecated))
^
/Users/thierry/Dev/barebones/src/crt/malloc.c:117:57: warning: 'sbrk' is deprecated [-Wdeprecated-declarations]
if (newptr && ptr && ptr >= malloc_base() && ptr <= sbrk(0)) {
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/unistd.h:585:1: note: 'sbrk' has been explicitly
marked deprecated here
__deprecated __WATCHOS_PROHIBITED __TVOS_PROHIBITED
^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/sys/cdefs.h:176:40: note: expanded from macro
'__deprecated'
#define __deprecated attribute((deprecated))
^
5 warnings generated.
make[1]: *** [src/CMakeFiles/kernel.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
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-- verifying file...
file='/Users/thierry/Dev/barebones/machines/default/build/exceptions/src/exceptions.zip'
-- Downloading... done
-- extracting...
src='/Users/thierry/Dev/barebones/machines/default/build/exceptions/src/exceptions.zip'
dst='/Users/thierry/Dev/barebones/machines/default/build/exceptions/src/exceptions'
-- extracting... [tar xfz]
-- extracting... [analysis]
-- extracting... [rename]
-- extracting... [clean up]
-- extracting... done
[ 44%] No update step for 'exceptions'
[ 44%] No patch step for 'exceptions'
[ 48%] No configure step for 'exceptions'
[ 51%] No build step for 'exceptions'
[ 55%] No install step for 'exceptions'
[ 59%] Completed 'exceptions'
[ 59%] Built target exceptions
make: *** [all] Error 2

[fwsGonzo]

Try installing clang using brew and use that. Although, if you just want this project to work then install Ubuntu desktop in VirtualBox or some other desktop virtualization application and it should just work out of the box.

[hexabyte23]

Yes I know that, but I thought could be cool to have source code directly compatible with MacOS. Thanks for your help fwsGonzo

[fwsGonzo]

The problem is that sections are named differently on macOS, but even so I think the ABI stuff is different too and that means there will be incompatibilities.
I removed the section attribute on the TLS structure, but there is still an error in your log that says that nasm can't access .multiboot, because there is no such section. You also don't have link.h and elf.h both of which are needed. So there is not going to be any building with APPLE defined anyway. Your best bet is to use crosstool-ng package and switch to a compiler that outputs Linux binaries, probably. :)

[hexabyte23]

ok, I find apple compatible version of elf.h and link.h (and dependencies) in Apple site here

https://opensource.apple.com/source/dtrace/dtrace-96/sys/

AppleClang compiler are no more complains, just see how to fix .multiboot problem ... must dig in my own kernel sample I wrote few months ago