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preserve CFLAGS between hardening checks, enable mingw

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Allow hardening CFLAGS for mingw that do not cause link-time failures.
Add proper quoting on flags for commas
Check LDFLAGS for linker-only flags.
This commit is contained in:
Brent Cook 2015-01-05 20:31:34 -06:00 committed by Brent Cook
parent 303b972d55
commit 872ecfd856
1 changed files with 46 additions and 26 deletions
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54
configure.ac
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@ -95,40 +95,60 @@ AC_ARG_ENABLE([hardening],
[], [enable_hardening=yes])
AC_DEFUN([CHECK_CFLAG],
[AC_LANG_ASSERT(C)
AC_LANG_ASSERT(C)
AC_MSG_CHECKING([if $saved_CC supports "$1"])
old_cflags="$CFLAGS"
CFLAGS=[$1]
AC_TRY_LINK([#include <stdio.h>],
CFLAGS=$1
AC_TRY_LINK([
#include <stdio.h>
],
[printf("Hello")],
AC_MSG_RESULT([yes])
HARDEN_CFLAGS="$HARDEN_CFLAGS [$1]",
HARDEN_CFLAGS="$HARDEN_CFLAGS $1",
AC_MSG_RESULT([no])
$2
$2)
CFLAGS=$old_cflags
)
])
AS_IF([test "x$enable_hardening" == "xyes" -a "x$HOST_OS" != "xwin"], [
AC_DEFUN([CHECK_LDFLAG],
AC_LANG_ASSERT(C)
AC_MSG_CHECKING([if $saved_LD supports "$1"])
old_ldflags="$LDFLAGS"
LDFLAGS=$1
AC_TRY_LINK([
#include <stdio.h>
],
[printf("Hello")],
AC_MSG_RESULT([yes])
HARDEN_LDFLAGS="$HARDEN_LDFLAGS $1",
AC_MSG_RESULT([no])
$2)
LDFLAGS=$old_ldflags
)
AS_IF([test "x$enable_hardening" == "xyes"], [
# Tell GCC to NOT optimize based on signed arithmetic overflow
CHECK_CFLAG([-fno-strict-overflow])
CHECK_CFLAG([[-fno-strict-overflow]])
# _FORTIFY_SOURCE replaces builtin functions with safer versions.
CHECK_CFLAG([-D_FORTIFY_SOURCE=2])
CHECK_CFLAG([[-D_FORTIFY_SOURCE=2]])
# Enable read only relocations
CHECK_LDFLAG([[-Wl,-z,relro]])
CHECK_LDFLAG([[-Wl,-z,now]])
])
# Use stack-protector-strong if available; if not, fallback to
# stack-protector-all which is considered to be overkill
CHECK_CFLAG([-fstack-protector-strong],
CHECK_CFLAG([-fstack-protector-all],
AC_MSG_ERROR([compiler does appear to support stack protection
- use --disable-hardening to override])
AS_IF([test "x$enable_hardening" == "xyes" -a "x$HOST_OS" != "xwin"], [
CHECK_CFLAG([[-fstack-protector-strong]],
CHECK_CFLAG([[-fstack-protector-all]],
AC_MSG_ERROR([compiler does appear to support stack protection - use --disable-hardening to override])
)
)
# Enable read only relocations
CHECK_CFLAG([-Wl,-z,relro])
CHECK_CFLAG([-Wl,-z,now])
])
# Restore CC, LD
CC="$saved_CC"
LD="$saved_LD"