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boinc/m4/sah_select_bitness.m4

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New autoconf macros: SAH_CHECK_LIB: Like AC_CHECK_LIB(), except it checks STATIC_LIB_LIST for libraries that should be linked statically. Static libraries are attempted to be linked with fully qualified path. If that fails, the static flags (-Wl,-Bstatic) are used. If no static library is found, the library is linked dynamically. SAH_STATICIZE_LDFLAGS: Goes through a given set of LDFLAGS and determines with libraries should be linked statically based upon STATIC_LIB_LIST, then calls SAH_CHECK_LIB on every library. SAH_DEFAULT_BITNESS: On architectures that support both 32 and 64 bit executables, this determines the current default model (including any CFLAGS settings). SAH_OPTION_BITNESS: Sets up a configure option to set the compiler -m64 or -m32 (or equivalent) flags for 32/64 bit compilation. svn path=/trunk/boinc/; revision=5957
2005-04-28 21:42:05 +00:00
AC_DEFUN([SAH_DEFAULT_BITNESS],[
if test -z "${COMPILER_MODEL_BITS}"
then
AC_MSG_CHECKING(default bitness of compiler)
echo "int main() { return 0; }" >conftest.c
${CC} ${CFLAGS} -c conftest.c >&5
COMPILER_MODEL_BITS=32
if test -f conftest.${OBJEXT} ; then
Removed unnecessary (since 1999) check for 16-bit compilers and made 64-bit detection better.
2014-05-02 15:17:26 +00:00
if test -n "`objdump --file-headers conftest.${OBJEXT} | grep 'file format' | grep 64`" || test -n "`file conftest.${OBJEXT} | grep 64-bit`" conftest.${OBJEXT}
New autoconf macros: SAH_CHECK_LIB: Like AC_CHECK_LIB(), except it checks STATIC_LIB_LIST for libraries that should be linked statically. Static libraries are attempted to be linked with fully qualified path. If that fails, the static flags (-Wl,-Bstatic) are used. If no static library is found, the library is linked dynamically. SAH_STATICIZE_LDFLAGS: Goes through a given set of LDFLAGS and determines with libraries should be linked statically based upon STATIC_LIB_LIST, then calls SAH_CHECK_LIB on every library. SAH_DEFAULT_BITNESS: On architectures that support both 32 and 64 bit executables, this determines the current default model (including any CFLAGS settings). SAH_OPTION_BITNESS: Sets up a configure option to set the compiler -m64 or -m32 (or equivalent) flags for 32/64 bit compilation. svn path=/trunk/boinc/; revision=5957
2005-04-28 21:42:05 +00:00
then
COMPILER_MODEL_BITS=64
Removed unnecessary (since 1999) check for 16-bit compilers and made 64-bit detection better.
2014-05-02 15:17:26 +00:00
# else
# if test -n "`objdump --file-headers conftest.${OBJEXT} | grep 'file format' | grep 16`"
# then
# COMPILER_MODEL_BITS=16
# fi
New autoconf macros: SAH_CHECK_LIB: Like AC_CHECK_LIB(), except it checks STATIC_LIB_LIST for libraries that should be linked statically. Static libraries are attempted to be linked with fully qualified path. If that fails, the static flags (-Wl,-Bstatic) are used. If no static library is found, the library is linked dynamically. SAH_STATICIZE_LDFLAGS: Goes through a given set of LDFLAGS and determines with libraries should be linked statically based upon STATIC_LIB_LIST, then calls SAH_CHECK_LIB on every library. SAH_DEFAULT_BITNESS: On architectures that support both 32 and 64 bit executables, this determines the current default model (including any CFLAGS settings). SAH_OPTION_BITNESS: Sets up a configure option to set the compiler -m64 or -m32 (or equivalent) flags for 32/64 bit compilation. svn path=/trunk/boinc/; revision=5957
2005-04-28 21:42:05 +00:00
fi
fi
/bin/rm conftest.c
AC_MSG_RESULT($COMPILER_MODEL_BITS)
fi
])
AC_DEFUN([SAH_SELECT_BITNESS],[
AC_LANG_PUSH(C)
SAH_DEFAULT_BITNESS
AC_MSG_CHECKING(Selecting $1 bit model)
echo "int main() { return 0; }" >conftest.$ac_ext
if test "$1" != "${COMPILER_MODEL_BITS}"
then
${CC} ${CFLAGS} ${CPPFLAGS} -m$1 -c conftest.$ac_ext >&5
if test -f conftest.${OBJEXT} ; then
if test -n "`file conftest.${OBJEXT} | grep -i $1-bit`"
then
CFLAGS="${CFLAGS} -m$1"
AC_MSG_RESULT(-m$1)
COMPILER_MODEL_BITS=$1
fi
AC_MSG_RESULT(failed)
fi
else
AC_MSG_RESULT(ok)
fi
AC_LANG_POP(C)
])
AC_DEFUN([SAH_OPTION_BITNESS],[
AC_ARG_ENABLE(bitness,
AC_HELP_STRING([--enable-bitness=(32,64)],
[enable 32 or 64 bit object/executable files]
),
[SAH_SELECT_BITNESS(${enableval})],
[SAH_DEFAULT_BITNESS]
)
])