From: Martin Mares <mj@ucw.cz>
Date: Tue, 12 Apr 2005 21:26:05 +0000 (+0000)
Subject: Even better CPU checks, this time taking into account GCC version.
X-Git-Tag: holmes-import~794
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=3e1e48b786ff2295ca6196253849b48d3a7f91b9;p=libucw.git

Even better CPU checks, this time taking into account GCC version.
---

diff --git a/lib/autoconf.cfg b/lib/autoconf.cfg
index e833836f..829b9b93 100644
--- a/lib/autoconf.cfg
+++ b/lib/autoconf.cfg
@@ -16,6 +16,23 @@ if (Get("OS") eq "Linux") {
 	Fail "Don't know how to run on this operating system.";
 }
 
+### Compiler ###
+
+# Default compiler
+Test("CC", "Checking for C compiler", sub { return "gcc"; });
+
+# GCC version
+Test("GCCVER", "Checking for GCC version", sub {
+	my $gcc = Get("CC");
+	my $ver = `$gcc --version | sed '2,\$d; s/^\\(.* \\)\\?\\([0-9]*\\.[0-9]*\\).*/\\2/'`;
+	chomp $ver;
+	Fail "Unable to determine GCC version" if $? || $ver eq "";
+	return $ver;
+});
+my ($gccmaj, $gccmin) = split(/\./, Get("GCCVER"));
+my $gccver = 1000*$gccmaj + $gccmin;
+$gccver >= 3000 or Fail "GCC older than 3.0 doesn't support C99 well enough.";
+
 ### CPU ###
 
 Test("CPU_ARCH", "Checking for CPU architecture", sub {
@@ -40,14 +57,14 @@ Test("CPU_ARCH", "Checking for CPU architecture", sub {
 			my $model  = $pc{'model'} || 0;
 			if ($vendor eq "AuthenticAMD") {
 				if ($family >= 6) {
-					if ($model >= 31) { $arch = "athlon64"; }
-					elsif ($model >= 6) { $arch = "athlon-xp"; }
+					if ($model >= 31 && $gccver >= 3003) { $arch = "athlon64"; }
+					elsif ($model >= 6 && $gccver >= 3003) { $arch = "athlon-xp"; }
 					else { $arch = "athlon"; }
 				}
 			} elsif ($vendor eq "GenuineIntel") {
-				# We don't recognize Prescott and Nocona cores yet
-				if ($family >= 15) { $arch = "pentium4"; }
-				elsif ($family >= 6) {
+				# We don't recognize Prescott and Nocona cores yet (gcc-3.4+)
+				if ($family >= 15 && $gccver >= 3003) { $arch = "pentium4"; }
+				elsif ($family >= 6 && $gccver >= 3003) {
 					if ($model >= 7) { $arch = "pentium3"; }
 					elsif ($model >= 3) { $arch = "pentium2"; }
 				}
@@ -76,23 +93,11 @@ if (Get("CPU_ARCH") eq "unknown") { Warn "CPU type not recognized, using default
 
 ### Compiler and its Options ###
 
-# Default compiler
-Test("CC", "Checking for C compiler", sub { return "gcc"; });
-
-# GCC version
-Test("GCCVER", "Checking for GCC version", sub {
-	my $gcc = Get("CC");
-	my $ver = `$gcc --version | sed '2,\$d; s/^\\(.* \\)\\?\\([0-9]*\\.[0-9]*\\).*/\\2/'`;
-	chomp $ver;
-	Fail "Unable to determine GCC version" if $? || $ver eq "";
-	return $ver;
-});
-
 # C flags: tell the compiler we're speaking C99
 Set("CLANG" => "-std=gnu99");
 
 # C optimizations
-Set("COPT" => '-O2 -fstrict-aliasing -march=$(CPU_ARCH)');
+Set("COPT" => '-O2 -fstrict-aliasing');
 Append("COPT", '-march=$(CPU_ARCH)') if IsSet("CPU_ARCH");
 
 # C optimizations for highly exposed code
@@ -112,11 +117,11 @@ Set("CSHARED" => '-fPIC');
 Set("LSHARED" => '-shared -Wl,-soname,lib/$(@F)');
 
 # Extra switches depending on GCC version:
-if (Get("GCCVER") eq "3.0") {
-} elsif (Get("GCCVER") eq "3.3") {
+if ($gccver == 3000) {
+} elsif ($gccver == 3003) {
 	Append("CWARNS" => "-Wundef -Wredundant-decls");
 	Append("COPT" => "-finline-limit=20000 --param max-inline-insns-auto=1000");
-} elsif (Get("GCCVER") eq "3.4") {
+} elsif ($gccver == 3004) {
 	Append("CWARNS" => "-Wundef -Wredundant-decls");
 	Append("COPT" => "-finline-limit=5000 --param large-function-insns=5000 --param inline-unit-growth=200 --param large-function-growth=400");
 } else {