From d7d3003e06ee0a313dbf9fbf2e7c7e0d70d22ff1 Mon Sep 17 00:00:00 2001
From: dan <dan>
Date: Sun, 31 Oct 2004 05:33:39 +0000
Subject: [PATCH] Detect if gcc is able to compile x86 asm and if it supports
 passing more than 10 parameters in inline asm, else disable asm code. This
 should enable it to work on any x86 platform (not just linux as before) given
 that a recent enough gcc is available (no more need to guess by looking at
 $host)

This should also fix the issues of compiling wrlib with gcc-2.95
---
 configure.ac | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/configure.ac b/configure.ac
index 4df05663..7f088821 100644
--- a/configure.ac
+++ b/configure.ac
@@ -205,23 +205,19 @@ dnl -----------------------
 asm_support=no
 mmx_support=no
 if test "$ac_cv_prog_gcc" = yes; then
-   
-    # gcc-3.4 complains about some of our stuff without this
+
+    # gcc-3.3 or newer complains about some of our stuff without this
     NOSTRICTALIASING="-fno-strict-aliasing"
 
-    x86=0
-    changequote(,)dnl
-    case "$host_cpu" in
-       i[3456]86) x86=1
-       ;;
-    esac
-    changequote([,])dnl
+    AC_CACHE_CHECK(whether gcc supports x86 inline asm,
+                   ac_cv_c_inline_asm,
+                   [AC_TRY_LINK(,[{int x; asm volatile("movl %%eax, %%ebx\n"::
+                          "m" (x),"m" (x),"m" (x),"m" (x),"m" (x),"m" (x),
+                          "m" (x),"m" (x),"m" (x),"m" (x),"m" (x),"m" (x));}],
+                   ac_cv_c_inline_asm=yes,
+                   ac_cv_c_inline_asm=no)])
 
-    if test "$host_os" != "linux" -a "$host_os" != "linux-gnu" ; then
-       x86=0
-    fi
-
-    if test $x86 = 1; then
+    if test "x$ac_cv_c_inline_asm" = xyes; then
        AC_DEFINE(ASM_X86, 1, [define if processor is x86 (normally detected by configure)])
        asm_support=yes