dnl Copyright © 2009-2021 Dynare Team
dnl
dnl This file is part of Dynare.
dnl
dnl Dynare is free software: you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation, either version 3 of the License, or
dnl (at your option) any later version.
dnl
dnl Dynare is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with Dynare.  If not, see <https://www.gnu.org/licenses/>.

AC_DEFUN([AX_MEXOPTS],
[dnl
AC_REQUIRE([AX_MEXEXT])
AC_REQUIRE([AX_MATLAB_ARCH])
AC_REQUIRE([AX_MATLAB_VERSION])
AC_REQUIRE([AC_PROG_SED])

AX_COMPARE_VERSION([$MATLAB_VERSION], [lt], [8.3], [AC_MSG_ERROR([Your MATLAB is too old, please upgrade to 8.3 (R2014a) at least.])])

AC_MSG_CHECKING([for options to compile MEX for MATLAB])

MATLAB_CPPFLAGS="-I$MATLAB/extern/include"

case ${MATLAB_ARCH} in
  glnxa64)
    MATLAB_DEFS="-D_GNU_SOURCE -DNDEBUG"
    MATLAB_CFLAGS="-fexceptions -fPIC -pthread"
    MATLAB_CXXFLAGS="-fPIC -pthread"
    MATLAB_FCFLAGS="-fPIC -fexceptions"
    MATLAB_LDFLAGS_NOMAP="-shared -Wl,--no-undefined -Wl,-rpath-link,$MATLAB/bin/glnxa64 -L$MATLAB/bin/glnxa64"
    MATLAB_LDFLAGS="$MATLAB_LDFLAGS_NOMAP -Wl,--version-script,$MATLAB/extern/lib/glnxa64/mexFunction.map"
    MATLAB_LIBS="-lmx -lmex -lmat -lm -lmwlapack -lmwblas"
    ax_mexopts_ok="yes"
    ;;
  win64)
    MATLAB_CFLAGS="-fexceptions"
    MATLAB_CXXFLAGS=""
    MATLAB_FCFLAGS="-fexceptions -fno-underscoring"
    MATLAB_DEFS="-DNDEBUG"
    # The hack for libquadmath is needed because -static-libgfortran
    # unfortunately does not imply the static linking of the former.
    # The last part about winpthread is a hack to avoid dynamically linking
    # against libwinpthread DLL (which is pulled in by libstdc++, even without
    # using threads, since we are using the POSIX threads version of MinGW)
    MATLAB_LDFLAGS_NOMAP="-static-libgcc -static-libstdc++ -static-libgfortran -Wl,-Bstatic,--whole-archive -lquadmath -Wl,-Bdynamic,--no-whole-archive -shared -L$MATLAB/bin/win64 -Wl,-Bstatic,--whole-archive -lwinpthread -Wl,-Bdynamic,--no-whole-archive"
    MATLAB_LDFLAGS="$MATLAB_LDFLAGS_NOMAP \$(abs_top_srcdir)/mex.def"
    # Hack for libssp, which is pulled in by -fstack-protector
    # (curiously only on some MEX files), see windows/build.sh.
    # Note that the link against libssp should not happen with compilers
    # from MSYS2, see:
    # https://www.msys2.org/news/#2022-10-10-libssp-is-no-longer-required
    # But it happens with Debian’s cross compilers (as of Debian “bookworm” 12).
    # Also note that the -lssp must come by the end of the link command
    # (otherwise it will have to be enclosed within --whole-archive).
    MATLAB_LIBS="-lmex -lmx -lmat -lmwlapack -lmwblas -Wl,-Bstatic -lssp -Wl,-Bdynamic"
    # Hack for static linking of libgomp, needed for OpenMP.
    # Should come by the end of the link command
    # (otherwise it will have to be enclosed within --whole-archive).
    OPENMP_LIBS="-Wl,-Bstatic -lgomp -Wl,-Bdynamic"
    ax_mexopts_ok="yes"
    ;;
  maci64)
    MATLAB_DEFS="-DNDEBUG"
    MATLAB_CFLAGS="-fno-common -fexceptions"
    MATLAB_CXXFLAGS="-fno-common -fexceptions"
    MATLAB_FCFLAGS="-fexceptions -fbackslash"
    MATLAB_LDFLAGS_NOMAP="-Wl,-twolevel_namespace -undefined error -bundle"
    MATLAB_LDFLAGS="$MATLAB_LDFLAGS_NOMAP -Wl,-exported_symbols_list,\$(abs_top_srcdir)/mexFunction-MacOSX.map"
    # This -L flag is put here, hence later on the linker command line, so as
    # to avoid linking against the HDF5 shipped by MATLAB (which would
    # otherwise override the HDF5 from Homebrew)
    MATLAB_LIBS="-L$MATLAB/bin/maci64 -lmx -lmex -lmat -lmwlapack -lmwblas"
    ax_mexopts_ok="yes"
    ;;
  *)
    ax_mexopts_ok="no"
    ;;
esac

# Converts the MATLAB version number into comparable integers with only major and minor version numbers
# For example, 7.4.2 will become 0704
ax_matlab_ver=$(echo "$MATLAB_VERSION" | $SED -e 's/\([[0-9]]*\)\.\([[0-9]]*\).*/Z\1ZZ\2Z/' \
                                              -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
                                              -e 's/[[^0-9]]//g')

MATLAB_DEFS="$MATLAB_DEFS -DMATLAB_VERSION=0x${ax_matlab_ver}"

if test "$ax_mexopts_ok" = "yes"; then
  AC_MSG_RESULT([ok])
else
  AC_MSG_RESULT([unknown])
fi

# Allow user to override default Matlab compilation flags
# Github ticket #1121
if test -n "$MATLAB_MEX_CPPFLAGS"; then
  MATLAB_CPPFLAGS="$MATLAB_CPPFLAGS $MATLAB_MEX_CPPFLAGS"
fi

if test -n "$MATLAB_MEX_DEFS"; then
  MATLAB_DEFS="$MATLAB_DEFS $MATLAB_MEX_DEFS"
fi

if test -n "$MATLAB_MEX_CFLAGS"; then
  MATLAB_CFLAGS="$MATLAB_CFLAGS $MATLAB_MEX_CFLAGS"
fi

if test -n "$MATLAB_MEX_CXXFLAGS"; then
  MATLAB_CXXFLAGS="$MATLAB_CXXFLAGS $MATLAB_MEX_CXXFLAGS"
fi

if test -n "$MATLAB_MEX_LDFLAGS"; then
  MATLAB_LDFLAGS="$MATLAB_LDFLAGS $MATLAB_MEX_LDFLAGS"
fi

if test -n "$MATLAB_MEX_LIBS"; then
  MATLAB_LIBS="$MATLAB_LIBS $MATLAB_MEX_LIBS"
fi

AC_SUBST([MATLAB_CPPFLAGS])
AC_SUBST([MATLAB_DEFS])
AC_SUBST([MATLAB_CFLAGS])
AC_SUBST([MATLAB_CXXFLAGS])
AC_SUBST([MATLAB_FCFLAGS])
AC_SUBST([MATLAB_LDFLAGS])
AC_SUBST([MATLAB_LIBS])
AC_SUBST([OPENMP_LIBS])
])