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dnl as-compiler-flag.m4 0.1.0
dnl autostars m4 macro for detection of compiler flags
dnl David Schleef <ds@schleef.org>
dnl Tim-Philipp Müller <tim centricular net>
dnl AS_COMPILER_FLAG(CFLAGS, ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED])
dnl Tries to compile with the given CFLAGS.
dnl Runs ACTION-IF-ACCEPTED if the compiler can compile with the flags,
dnl and ACTION-IF-NOT-ACCEPTED otherwise.
AC_DEFUN([AS_COMPILER_FLAG],
[
AC_MSG_CHECKING([to see if compiler understands $1])
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $1"
AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no])
CFLAGS="$save_CFLAGS"
if test "X$flag_ok" = Xyes ; then
$2
true
else
$3
true
fi
AC_MSG_RESULT([$flag_ok])
])
dnl AS_CXX_COMPILER_FLAG(CPPFLAGS, ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED])
dnl Tries to compile with the given CPPFLAGS.
dnl Runs ACTION-IF-ACCEPTED if the compiler can compile with the flags,
dnl and ACTION-IF-NOT-ACCEPTED otherwise.
AC_DEFUN([AS_CXX_COMPILER_FLAG],
[
AC_REQUIRE([AC_PROG_CXX])
AC_MSG_CHECKING([to see if c++ compiler understands $1])
save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $1"
AC_LANG_PUSH(C++)
AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no])
CPPFLAGS="$save_CPPFLAGS"
if test "X$flag_ok" = Xyes ; then
$2
true
else
$3
true
fi
AC_LANG_POP(C++)
AC_MSG_RESULT([$flag_ok])
])
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