[PATCH] Lower optimization level for Sun Studio before 12.1

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1313530448 -14400
# Node ID 0879b1bfe58dbccc21accbf32f25306ecacb26e4
# Parent  561a37709f6d7f31424a04d7e2c4855a7464a933
Lower optimization level for Sun Studio before 12.1.

At least Sun Studio 12 has problems with bit-fields exposed by nginx code
(caught by test suite).  They seems to be fixed in Sun Studio 12.1.  As a
workaround use "-fast -xalias_level=any" for older versions, it resolves
the problem.

diff --git a/auto/cc/sunc b/auto/cc/sunc
--- a/auto/cc/sunc
+++ b/auto/cc/sunc
@@ -6,6 +6,7 @@
 # Sun C 5.8 2005/10/13                    Sun Studio 11
 # Sun C 5.9 SunOS_i386 2007/05/03         Sun Studio 12
 # Sun C 5.9 SunOS_sparc 2007/05/03
+# Sun C 5.10 SunOS_i386 2009/06/03        Sun Studio 12.1
 
 NGX_SUNC_VER=`$CC -V 2>&1 | grep 'Sun C' 2>&1 \
                           | sed -e 's/^.* Sun C \(.*\)/\1/'`
@@ -57,9 +58,19 @@ esac
 
 # optimizations
 
+# 20736 == 0x5100, Sun Studio 12.1
+
+if [ "$ngx_sunc_ver" -ge 20736 ]; then
+    FAST="-fast"
+
+else
+    # older versions had problems with bit-fields
+    FAST="-fast -xalias_level=any"
+fi
+
 IPO=-xipo
-CFLAGS="$CFLAGS -fast $IPO"
-CORE_LINK="$CORE_LINK -fast $IPO"
+CFLAGS="$CFLAGS $FAST $IPO"
+CORE_LINK="$CORE_LINK $FAST $IPO"
 
 
 case $CPU in
@@ -126,15 +137,15 @@ CFLAGS="$CFLAGS $CPU_OPT"
 
 
 if [ ".$PCRE_OPT" = "." ]; then
-    PCRE_OPT="-fast $IPO $CPU_OPT"
+    PCRE_OPT="$FAST $IPO $CPU_OPT"
 fi
 
 if [ ".$MD5_OPT" = "." ]; then
-    MD5_OPT="-fast $IPO $CPU_OPT"
+    MD5_OPT="$FAST $IPO $CPU_OPT"
 fi
 
 if [ ".$ZLIB_OPT" = "." ]; then
-    ZLIB_OPT="-fast $IPO $CPU_OPT"
+    ZLIB_OPT="$FAST $IPO $CPU_OPT"
 fi