Fix Fortran build

As reported by #51

Author: tbeu

.github/workflows/autotools.yml

@@ -19,11 +19,16 @@ jobs:
       matrix:
         toolchain:
           - linux-gcc
+          - linux-gcc-fortran
           - macos-clang
         include:
           - toolchain: linux-gcc
             os: ubuntu-latest
             compiler: gcc
+          - toolchain: linux-gcc-fortran
+            os: ubuntu-latest
+            compiler: gcc
+            fortran: true
           - toolchain: macos-clang
             os: macos-latest
             compiler: clang
@@ -40,6 +45,9 @@ jobs:
           else
             pip install --user cpp-coveralls
           fi
+          if [ "${{ matrix.fortran }}" == "true" ]; then
+            sudo apt-get install -y gfortran
+          fi
       - name: Install hdf5
         timeout-minutes: 5
         run: |
@@ -52,7 +60,11 @@ jobs:
       - name: Configure
         run: |
           ./autogen.sh
-          ./configure --quiet --enable-shared --enable-coverage --enable-debug --enable-mat73 --enable-extended-sparse --with-pic --with-hdf5=${GITHUB_WORKSPACE}/hdf5
+          FORTRAN_FLAG=""
+          if [ "${{ matrix.fortran }}" == "true" ]; then
+            FORTRAN_FLAG="--enable-fortran"
+          fi
+          ./configure --quiet --enable-shared --enable-coverage --enable-debug --enable-mat73 --enable-extended-sparse --with-pic --with-hdf5=${GITHUB_WORKSPACE}/hdf5 $FORTRAN_FLAG
       - name: Build with ${{ matrix.compiler }}
         run: make -j8
       - name: Test

configure.ac

@@ -30,12 +30,39 @@ AC_ARG_VAR([FCLDFLAGS],[Fortran compiler-specific flags at link time])
 AC_ARG_VAR([LT_CFLAGS],[C compiler flags passed to libtool in compile mode])
 AC_ARG_VAR([LT_LDFLAGS],[Flags passed to libtool in link mode])
 
+dnl
+# Enable fortran interface
+AC_ARG_ENABLE(fortran,
+[  --enable-fortran            enable fortran interface to mat library],
+  [if test "$enableval" = "no" ; then
+    enable_fortran=no
+  else
+    enable_fortran=yes
+  fi],
+  enable_fortran=no)
+
 dnl
 dnl  Build programs, C compiler, F77 compiler, make, install, etc.
 dnl
 AC_PROG_CC([pgcc icc gcc cc])
 AC_USE_SYSTEM_EXTENSIONS
 
+if test "$enable_fortran" = "yes"
+then
+    AC_PROG_FC([pgf95 pgf90 ifort gfortran g95])
+    AC_FC_WRAPPERS
+    AC_CONFIG_FILES([src/fortran/matio_t.inc])
+    dnl gfortran >= 10 requires -fallow-argument-mismatch for legacy interfaces
+    AC_MSG_CHECKING([whether $FC supports -fallow-argument-mismatch])
+    saved_FCFLAGS="$FCFLAGS"
+    FCFLAGS="$FCFLAGS -fallow-argument-mismatch"
+    AC_LANG_PUSH([Fortran])
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+        [AC_MSG_RESULT([yes])],
+        [AC_MSG_RESULT([no]); FCFLAGS="$saved_FCFLAGS"])
+    AC_LANG_POP([Fortran])
+fi
+
 AC_ARG_ENABLE(coverage,
 [  --enable-coverage       Enable coverage testing],
 [CFLAGS="$CFLAGS -fprofile-arcs -ftest-coverage"])
@@ -105,6 +132,10 @@ then
     FCFLAGS="$PROFILE_FCFLAGS $FCFLAGS"
 fi
 
+dnl
+dnl Try to avoid having libtool search for a fortran compiler
+dnl
+F77=$FC
 AC_ENABLE_SHARED
 AC_ENABLE_STATIC
 LT_INIT
@@ -368,6 +399,18 @@ esac
 AM_CONDITIONAL([LINUX], [test "x$linux" = "xyes"])
 AM_CONDITIONAL([WINNT], [test "x$winnt" = "xyes"])
 AM_CONDITIONAL([SUN],   [test "x$sun"   = "xyes"])
+AM_CONDITIONAL([ENABLE_FORTRAN], [test "x$enable_fortran" = "xyes"])
+
+dnl
+dnl Without this, the linker line is incorrect on platforms without a fortran
+dnl compiler even if we are not using fortran sources
+dnl
+if test "x$enable_fortran" != "xyes"; then
+  FCLINK='$(LINK)'
+else
+  FCLINK='$(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=link $(FCLD) $(AM_FCFLAGS) $(FCFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@'
+fi
+AC_SUBST(FCLINK)
 
 winnt="no"
 case "${host_os}" in
@@ -396,9 +439,13 @@ AC_MSG_RESULT([])
 AC_MSG_RESULT([   MATIO Configuration Summary       ])
 AC_MSG_RESULT([==============================================================])
 AC_MSG_RESULT([           C Compiler: $CC])
+AC_MSG_RESULT([     Fortran Compiler: $FC])
 AC_MSG_RESULT([               CFLAGS: $CFLAGS])
+AC_MSG_RESULT([              FCFLAGS: $FCFLAGS])
+AC_MSG_RESULT([            FCLDFLAGS: $FCLDFLAGS])
 AC_MSG_RESULT([     Shared Libraries: $enable_shared])
 AC_MSG_RESULT([     Static Libraries: $enable_static])
+AC_MSG_RESULT([    Fortran Interface: $enable_fortran])
 AC_MSG_RESULT([  default MAT version: $file_ver])
 AC_MSG_RESULT([])
 AC_MSG_RESULT([Features --------------------------------------------])

src/Makefile.am

@@ -31,14 +31,25 @@ libmatio_la_SOURCES    = endian.c io.c $(ZLIB_SRC) read_data.c \
                          mat5.c mat4.c mat.c matvar_cell.c matvar_struct.c \
                          mcos.c
 libmatio_la_LIBADD     = $(HDF5_LIBS) $(ZLIB_LIBS) $(SNPRINTF_LIBS)
-libmatio_la_LDFLAGS    = -no-undefined -export-symbols @srcdir@/matio.sym $(AM_LDFLAGS)
 
 if MAT73
     libmatio_la_SOURCES += mat73.c
 endif
 
 EXTRA_DIST = matio.sym
 
+if ENABLE_FORTRAN
+    AM_FCFLAGS              = -I. -I$(top_builddir)/src/fortran
+    AM_LDFLAGS             += $(FCLDFLAGS)
+    libmatio_la_LDFLAGS     = $(AM_LDFLAGS)
+    libmatio_la_SOURCES    += fortran/matio_internal.c fortran/matio.f90
+    nodist_include_HEADERS += $(top_builddir)/src/matio.mod
+    noinst_HEADERS         += fortran/create.f90 fortran/read_data.f90 \
+                              fortran/write_data.f90 fortran/write.f90
+else
+    libmatio_la_LDFLAGS     = -no-undefined -export-symbols @srcdir@/matio.sym $(AM_LDFLAGS)
+endif
+
 dosubst = sed -e 's,[@]PACKAGE[@],$(PACKAGE),g' \
               -e 's,[@]VERSION[@],$(VERSION),g' \
               -e 's,\/,\\,g'

src/fortran/matio_internal.c

@@ -6,14 +6,12 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include "matio_private.h"
 #include <stdlib.h>
-#include <stdio.h>
 #include <string.h>
 #if defined(HAVE_STRINGS_H)
 #include <strings.h>
 #endif
-#include "matio.h"
-#include "matio_private.h"
 
 #define fmat_loginit_c \
             FC_FUNC_(fmat_loginit_c,FMAT_LOGINIT_C)

test/Makefile.am

@@ -783,6 +783,16 @@ TEST_LFLAGS = -L$(top_builddir)/src
 
 noinst_PROGRAMS = test_mat test_snprintf
 
+if ENABLE_FORTRAN
+noinst_PROGRAMS += test_matf
+
+test_matf_SOURCES = test_matf.f90
+test_matf_CFLAGS  = -I$(top_builddir)/src -I$(top_builddir)/src/fortran
+test_matf_FCFLAGS = -I$(top_builddir)/src -I$(top_builddir)/src/fortran
+test_matf_LDFLAGS = -L$(top_builddir)/src -L$(top_builddir)/src/fortran
+test_matf_LDADD   = $(TEST_LIBS)
+endif
+
 test_mat_SOURCES = test_mat.c
 test_mat_LDADD   = $(TEST_LIBS)
 test_mat_LDFLAGS = $(TEST_LFLAGS)