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dnl Copyright (C) 2010 Vincent Torri <vtorri at univ-evry dot fr>
dnl and Albin Tonnerre <albin dot tonnerre at gmail dot com>
dnl That code is public domain and can be freely used or copied.
dnl Macro that checks if a compiler flag is supported by the compiler.
dnl Usage: OPJ_COMPILER_FLAG(flag)
dnl flag is added to CFLAGS if supported.
AC_DEFUN([OPJ_COMPILER_FLAG],
[
CFLAGS_save="${CFLAGS}"
CFLAGS="${CFLAGS} $1"
AC_LANG_PUSH([C])
AC_MSG_CHECKING([whether the compiler supports $1])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]])],
[have_flag="yes"],
[have_flag="no"])
AC_MSG_RESULT([${have_flag}])
if test "x${have_flag}" = "xno" ; then
CFLAGS="${CFLAGS_save}"
fi
AC_LANG_POP([C])
])
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