Re: [LinuxBIOS] Add automagic detection for -fno-stack-protector

[Jordan Crouse]

On 04/07/07 00:06 +0200, Uwe Hermann wrote:
> On Tue, Jul 03, 2007 at 05:01:43AM +0200, Stefan Reinauer wrote:
> > is there some way we can include this in util/xcompile/xcompile
> > instead?
> >
> > That script was meant to be an abstraction for stuff like this at some
> > point.
>
> Ack, would be better in xcompile. Could somebody please test this on
> non-Linux platforms, too? E.g. Solaris, FreeBSD, OpenBSD etc. etc.

Okay then - here goes.   Please test extensively.....

Jordan

[PATCH][v3]  Add testcc() function to xcompile to check for -fno-stack-protector

enable xcompile to check for various compiler flags and set them in the 
CFLAGS variable if they are located.

Signed-off-by: Jordan Crouse

Index: LinuxBIOSv3/Makefile
===================================================================
--- LinuxBIOSv3.orig/Makefile	2007-07-03 16:29:49.000000000 -0600
+++ LinuxBIOSv3/Makefile	2007-07-03 16:32:01.000000000 -0600
@@ -96,6 +96,7 @@
 AS := $(AS_$(ARCH))
 LD := $(LD_$(ARCH))
 OBJCOPY := $(OBJCOPY_$(ARCH))
+CFLAGS += $(CFLAGS_$(ARCH))

CPPFLAGS := $(LINUXBIOSINCLUDE)
 CFLAGS += $(LINUXBIOSINCLUDE)
Index: LinuxBIOSv3/util/xcompile/xcompile
===================================================================
--- LinuxBIOSv3.orig/util/xcompile/xcompile	2007-07-03 16:32:16.000000000 -0600
+++ LinuxBIOSv3/util/xcompile/xcompile	2007-07-03 16:32:20.000000000 -0600
@@ -25,6 +25,15 @@
    		-e s/s390x/s390/ -e s/parisc64/parisc/ \
    		-e s/ppc.*/powerpc/ -e s/mips.*/mips/`

+testcc()
+{
+	TMP=".$$$$.tmp"
+	$1 $2 -S -xc /dev/null -o $TMP > /dev/null 2>&1
+	ret=$?
+	rm -rf $TMP
+	return $ret 
+}
+
 searchgnu()
 {
    # $1 short name
@@ -45,18 +54,23 @@
 case  "$ARCH" in
 "x86_64")
    echo "CC_x86 := gcc -m32"
+	CC="gcc -m32"
+
    searchgnu as >/dev/null && echo "AS_x86 := $(searchgnu as) --32"
    searchgnu ld >/dev/null && echo "LD_x86 := $(searchgnu ld) -b elf32-i386 -melf_i386"
    searchgnu objcopy >/dev/null && echo "OBJCOPY_x86 := $(searchgnu objcopy)"
    ;;
 "x86")
    echo "CC_x86 := gcc"
+	CC="gcc"
+
    searchgnu as >/dev/null && echo "AS_x86 := $(searchgnu as)"
    searchgnu ld >/dev/null && echo "LD_x86 := $(searchgnu ld)"
    searchgnu objcopy >/dev/null && echo "OBJCOPY_x86 := $(searchgnu objcopy)"
    ;;
 *)
    # FIXME: This should be detected.
+	CC="i386-linux-gcc"
    echo "CC_x86 := i386-linux-gcc"
    echo "AS_x86 := i386-linux-as"
    echo "LD_x86 := i386-linux-ld"
@@ -64,6 +78,13 @@
    ;;
 esac

+# This is where we test for various flags and other things
+
+CFLAGS=""
+testcc "$CC" "-fno-stack-protector" && CFLAGS="$CFLAGS-fno-stack-protector " 
+
+echo "CFLAGS_x86 := $CFLAGS"
+
 # TODO: The same as above for PowerPC, and other architectures
 #       as soon as they are supported by LinuxBIOSv3.