This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
make -march=native available even in some cross compiles
- From: gkeating at apple dot com (Geoffrey Keating)
- To: gcc-patches at gcc dot gnu dot org
- Date: Fri, 22 Sep 2006 16:50:36 -0700 (PDT)
- Subject: make -march=native available even in some cross compiles
The previous version of this code would make -mcpu=native available
only when the host and target were exactly the same. This patch
expands it to make -mcpu=native available whenever the host and target
are both x86 or x86_64 platforms.
This fixes a regression where
.../configure --target=i386-apple-darwin \
--with-sysroot=/Developer/SDKs/MacOSX10.4u.sdk --with-as=/usr/bin/as \
--with-ld=/usr/bin/ld
on a powerpc-darwin system would fail to link xgcc because
host_detect_local_cpu was undefined, by making it not required. It
also fixes a similar regression with the same command-line on an
i386-darwin system, but in that case by causing host_detect_local_cpu
to be defined.
Tested by building after the above configure command.
--
- Geoffrey Keating <geoffk@apple.com>
===File ~/patches/gcc-i386-alwayshostdetect.patch===========
2006-09-22 Geoffrey Keating <geoffk@apple.com>
* config/i386/driver-i386.c: Always define host_detect_local_cpu.
* config/i386/i386.h: Define EXTRA_SPEC_FUNCTIONS on any i386
or x86_64 host. Define HAVE_LOCAL_CPU_DETECT.
(CC1_CPU_SPEC): Make conditional on HAVE_LOCAL_CPU_DETECT rather
than replicating condition above.
* config.host (i[34567]86-*-*): Always use driver-i386.o.
Index: config.host
===================================================================
--- config.host (revision 117150)
+++ config.host (working copy)
@@ -97,11 +97,8 @@
case ${host} in
i[34567]86-*-* \
| x86_64-*-* )
- # include the support for -march=native only when not cross compiling
- if test x${host} = x${target} ; then
- host_extra_gcc_objs="driver-i386.o"
- host_xmake_file="${host_xmake_file} i386/x-i386"
- fi
+ host_extra_gcc_objs="driver-i386.o"
+ host_xmake_file="${host_xmake_file} i386/x-i386"
;;
esac
Index: config/i386/i386.h
===================================================================
--- config/i386/i386.h (revision 117150)
+++ config/i386/i386.h (working copy)
@@ -274,12 +274,15 @@
#define OPTIMIZATION_OPTIONS(LEVEL, SIZE) \
optimization_options ((LEVEL), (SIZE))
-/* -march=native handling only makes sense with a native compiler. */
-#ifndef CROSS_COMPILE
+/* -march=native handling only makes sense with compiler running on
+ an x86 or x86_64 chip. If changing this condition, also change
+ the condition in driver-i386.c. */
+#if defined(__i386__) || defined(__x86_64__)
/* In driver-i386.c. */
extern const char *host_detect_local_cpu (int argc, const char **argv);
#define EXTRA_SPEC_FUNCTIONS \
{ "local_cpu_detect", host_detect_local_cpu },
+#define HAVE_LOCAL_CPU_DETECT
#endif
/* Support for configure-time defaults of some command line options.
@@ -311,7 +314,7 @@
%{mno-intel-syntax:-masm=att \
%n`-mno-intel-syntax' is deprecated. Use `-masm=att' instead.\n}"
-#ifdef CROSS_COMPILE
+#ifndef HAVE_LOCAL_CPU_DETECT
#define CC1_CPU_SPEC CC1_CPU_SPEC_1
#else
#define CC1_CPU_SPEC CC1_CPU_SPEC_1 \
Index: config/i386/driver-i386.c
===================================================================
--- config/i386/driver-i386.c (revision 117150)
+++ config/i386/driver-i386.c (working copy)
@@ -22,11 +22,6 @@
#include "system.h"
#include <stdlib.h>
-#ifndef CROSS_COMPILE
-/* This file shouldn't even be included in a cross compiler, but
- let's be sure. */
-extern const char *host_detect_local_cpu (int argc, const char **argv);
-
#ifdef GCC_VERSION
#define cpuid(num,a,b,c,d) \
asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" \
@@ -170,5 +165,4 @@
{
return concat ("-m", argv[0], "=i386", NULL);
}
-#endif
-#endif
+#endif /* GCC_VERSION */
============================================================