96 lines
2.6 KiB
Plaintext
96 lines
2.6 KiB
Plaintext
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++])
|
|
])
|