Automatic detection of host OS and also partial automatic detection of the

[libucw.git] / lib / autoconf.cfg

diff --git a/lib/autoconf.cfg b/lib/autoconf.cfg
index 2fea596c734412421ad4fd68c0f88d3a79e2e873..7bb50c7013b39a1bfe6c82431b324f3f8f971071 100644 (file)
--- a/lib/autoconf.cfg
+++ b/lib/autoconf.cfg
@@ -1,13 +1,74 @@
 # Automatic configuration of the UCW Library
 # (c) 2005 Martin Mares <mj@ucw.cz>
 
-Set("CC" => "gcc-3.0");
+### OS ###
+
+Test("OS", "Checking on which OS we run", sub {
+       my $os = `uname`;
+       chomp $os;
+       Fail "Unable to determine OS type" if $? || $os eq "";
+       return $os;
+});
+
+if (Get("OS") eq "Linux") {
+       Set("CONFIG_LINUX");
+} else {
+       Fail "Don't know how to run on this operating system.";
+}
+
+### CPU ###
+
+Test("CPU_ARCH", "Checking for CPU architecture", sub {
+       my $mach = `uname -m`;
+       chomp $mach;
+       Fail "Unable to determine machine type" if $? || $mach eq "";
+       if ($mach =~ /^i[0-9]86$/) {
+               Set("CPU_I386");
+               my $arch = "";
+               if (IsSet("CONFIG_EXACT_CPU") && IsSet("CONFIG_LINUX") && open X, "/proc/cpuinfo") {
+                       my %pc = ();
+                       while (<X>) {
+                               chomp;
+                               /^$/ && last;
+                               /^([^\t]+)\t+:\s*(.*)$/ and $pc{$1}=$2;
+                       }
+                       close X;
+                       if ($pc{'vendor_id'} eq "AuthenticAMD" && $pc{'cpu family'} >= 6) {
+                               $arch = "i686";
+                       }
+                       if ($arch ne "") {
+                               Log "(according to /proc/cpuinfo) ";
+                       } else {
+                               Log "(don't understand /proc/cpuinfo) ";
+                       }
+               }
+               return $arch ? $arch : "i386";
+       } else {
+               return "unknown";
+       }
+});
+if (Get("CPU_ARCH") eq "unknown") { Warn "CPU type not recognized, using defaults, keep fingers crossed."; }
+
+### 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=$(CPU_ARCH)');
+Append("COPT", '-march=$(CPU_ARCH)') if IsSet("CPU_ARCH");
 
 # C optimizations for highly exposed code
 Set("COPT2" => '-O3');
@@ -26,44 +87,40 @@ Set("CSHARED" => '-fPIC');
 Set("LSHARED" => '-shared -Wl,-soname,lib/$(@F)');
 
 # Extra switches depending on GCC version:
-# [FIXME]
-#GCCVER:=$(shell $(CC) --version | sed '2,$$d; s/^\(.* \)\?\([0-9]*\.[0-9]*\).*/\2/')
-#ifeq ($(GCCVER),3.3)
-#CWARNS+=-Wundef -Wredundant-decls
-#COPT+=-finline-limit=20000 --param max-inline-insns-auto=1000
-#endif
-#ifeq ($(GCCVER),3.4)
-#CWARNS+=-Wundef -Wredundant-decls
-#COPT+=-finline-limit=5000 --param large-function-insns=5000 --param inline-unit-growth=200 --param large-function-growth=400
-#endif
-
-# If debugging:
-Set("CDEBUG" => '-DDEBUG_ASSERTS -ggdb');
-#CDEBUG+=-DDEBUG_DIE_BY_ABORT
+if (Get("GCCVER") eq "3.0") {
+} elsif (Get("GCCVER") eq "3.3") {
+       Append("CWARNS" => "-Wundef -Wredundant-decls");
+       Append("COPT" => "-finline-limit=20000 --param max-inline-insns-auto=1000");
+} elsif (Get("GCCVER") eq "3.4") {
+       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 {
+       Warn "Don't know anything about this GCC version, using default switches.\n";
+}
+
+if (IsSet("CONFIG_DEBUG")) {
+       # If debugging:
+       Set("DEBUG_ASSERTS");
+       Set("DEBUG_DIE_BY_ABORT") if Get("CONFIG_DEBUG") > 1;
+       Set("CDEBUG" => "-ggdb");
+} else {
+       # If building a release version:
+       Append("COPT" => "-fomit-frame-pointer");
+       Append("LOPT" => "-s");
+}
 
 # If debugging memory allocations:
 #LIBS+=-lefence
 #CDEBUG+=-DDEBUG_DMALLOC
 #LIBS+=-ldmalloc
 
-# If building release versions:
-#CDEBUG=
-#COPT+=-fomit-frame-pointer
-#LOPT+=-s
-
 ### CPU Type and Features ###
 
-Set("CPU_ARCH" => 'i686');
-Set("CPU_I386");
 Set("CPU_LITTLE_ENDIAN");
 #CPU_BIG_ENDIAN=1
 Set("CPU_ALLOW_UNALIGNED");
 Set("CPU_STRUCT_ALIGN" => 4);
 Set("CPU_64BIT_POINTERS");
 
-### OS Type ###
-
-Set("CONFIG_LINUX");
-
 # Return success
 1;