warzone2100/m4/stack-protector.m4

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dnl
dnl AX_STACK_PROTECT_CC and AX_STACK_PROTECT_CXX
dnl
dnl checks for -fstack-protector with the C compiler and C++ compiler
dnl respectively, if it exists then updates CFLAGS and CXXFLAGS respectively
dnl
dnl Test program that should definitly cause -fstack-protector to
dnl insert stack checking code.
m4_define([stack_protector_c_test_program],
[
AC_LANG_PROGRAM([[
#include <stdio.h>
#include <string.h>
extern char *test_a, *test_b;
char *test_a, *test_b;
char* test_concat(void)
{
char buf[2048];
strcpy(buf, test_a);
strcat(buf, test_b);
return strdup(buf);
}
]],[[
puts(test_concat());
]])
])
AC_DEFUN([AX_STACK_PROTECT_CC],[
AC_MSG_CHECKING([whether ${CC} accepts -fstack-protector])
AC_LANG_PUSH([C])
AC_LANG_COMPILER_REQUIRE()
# Keep a copy of the old CFLAGS and CXXFLAGS
OLD_CFLAGS="$CFLAGS"
OLD_CXXFLAGS="$CXXFLAGS"
CFLAGS="$CFLAGS -fstack-protector"
CXXFLAGS="$CXXFLAGS -fstack-protector"
dnl Execute the actual checks
dnl Try to compile and link as C both
AC_LINK_IFELSE([stack_protector_c_test_program], [
dnl Try to compile as C and link as C++
AC_LANG_CONFTEST([stack_protector_c_test_program])
AS_IF([{
rm -f conftest.$ac_objext conftest$ac_exeext
AS_IF([_AC_DO_STDERR($ac_compile) &&
_AC_DO_STDERR($CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD) && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext && {
test "$cross_compiling" = yes ||
AS_TEST_X([conftest$ac_exeext])
}],
[ac_retval=0],
[_AC_MSG_LOG_CONFTEST
ac_retval=1])
# Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
# created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
# interfere with the next link command; also delete a directory that is
# left behind by Apple's compiler. We do this before executing the actions.
rm -rf conftest.dSYM conftest_ipa8_conftest.oo
test "$ac_retval" = 0
}], AC_MSG_RESULT(yes), [
CFLAGS="$OLD_CFLAGS"
AC_MSG_RESULT(no)
])
],[
CFLAGS="$OLD_CFLAGS"
AC_MSG_RESULT(no)
])
# Restore CXXFLAGS as we're testing the C compiler here, not the C++ compiler.
CXXFLAGS="$OLD_CXXFLAGS"
AC_LANG_POP([C])
])
AC_DEFUN([AX_STACK_PROTECT_CXX],[
AC_MSG_CHECKING([whether ${CXX} accepts -fstack-protector])
AC_LANG_PUSH([C++])
# Keep a copy of the old CXXFLAGS
OLD_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fstack-protector"
AC_LINK_IFELSE([stack_protector_c_test_program], AC_MSG_RESULT(yes), [
CXXFLAGS="$OLD_CXXFLAGS"
AC_MSG_RESULT(no)
])
AC_LANG_POP([C++])
])