lib/autoconf.cfg

   1 # Automatic configuration of the UCW Library
   2 # (c) 2005 Martin Mares <mj@ucw.cz>
   3
   4 ### OS ###
   5
   6 Test("OS", "Checking on which OS we run", sub {
   7         my $os = `uname`;
   8         chomp $os;
   9         Fail "Unable to determine OS type" if $? || $os eq "";
  10         return $os;
  11 });
  12
  13 if (Get("OS") eq "Linux") {
  14         Set("CONFIG_LINUX");
  15 } else {
  16         Fail "Don't know how to run on this operating system.";
  17 }
  18
  19 ### Compiler ###
  20
  21 # Default compiler
  22 Test("CC", "Checking for C compiler", sub { return "gcc"; });
  23
  24 # GCC version
  25 Test("GCCVER", "Checking for GCC version", sub {
  26         my $gcc = Get("CC");
  27         my $ver = `$gcc --version | sed '2,\$d; s/^\\(.* \\)\\?\\([0-9]*\\.[0-9]*\\).*/\\2/'`;
  28         chomp $ver;
  29         Fail "Unable to determine GCC version" if $? || $ver eq "";
  30         return $ver;
  31 });
  32 my ($gccmaj, $gccmin) = split(/\./, Get("GCCVER"));
  33 my $gccver = 1000*$gccmaj + $gccmin;
  34 $gccver >= 3000 or Fail "GCC older than 3.0 doesn't support C99 well enough.";
  35
  36 ### CPU ###
  37
  38 Test("CPU_ARCH", "Checking for CPU architecture", sub {
  39         my $mach = `uname -m`;
  40         chomp $mach;
  41         Fail "Unable to determine machine type" if $? || $mach eq "";
  42         if ($mach =~ /^i[0-9]86$/) {
  43                 Set("CPU_I386");
  44                 UnSet("CPU_64BIT_POINTERS");
  45                 Set("CPU_LITTLE_ENDIAN");
  46                 UnSet("CPU_BIG_ENDIAN");
  47                 Set("CPU_ALLOW_UNALIGNED");
  48                 Set("CPU_STRUCT_ALIGN" => 4);
  49                 my $arch = "";
  50                 if (IsSet("CONFIG_EXACT_CPU") && IsSet("CONFIG_LINUX") && open X, "/proc/cpuinfo") {
  51                         my %pc = ();
  52                         while (<X>) {
  53                                 chomp;
  54                                 /^$/ && last;
  55                                 /^([^\t]+)\t+:\s*(.*)$/ and $pc{$1}=$2;
  56                         }
  57                         close X;
  58
  59                         # Try to understand CPU vendor, family and model [inspired by MPlayer's configure script]
  60                         my $vendor = $pc{'vendor_id'} || "";
  61                         my $family = $pc{'cpu family'} || 0;
  62                         my $model  = $pc{'model'} || 0;
  63                         if ($vendor eq "AuthenticAMD") {
  64                                 if ($family >= 6) {
  65                                         if ($model >= 31 && $gccver >= 3004) { $arch = "athlon64"; }
  66                                         elsif ($model >= 6 && $gccver >= 3003) { $arch = "athlon-xp"; }
  67                                         else { $arch = "athlon"; }
  68                                 }
  69                         } elsif ($vendor eq "GenuineIntel") {
  70                                 # We don't recognize Prescott and Nocona cores yet (gcc-3.4+)
  71                                 if ($family >= 15 && $gccver >= 3003) { $arch = "pentium4"; }
  72                                 elsif ($family >= 6 && $gccver >= 3003) {
  73                                         if ($model >= 7) { $arch = "pentium3"; }
  74                                         elsif ($model >= 3) { $arch = "pentium2"; }
  75                                 }
  76                         }
  77
  78                         # No match on vendor, try the family
  79                         if ($arch eq "") {
  80                                 if ($family >= 6) {
  81                                         $arch = "i686";
  82                                 } elsif ($family >= 3) {
  83                                         $arch = "i${family}86";
  84                                 }
  85                         }
  86                         if ($arch ne "") {
  87                                 Log "(using /proc/cpuinfo) ";
  88                         } else {
  89                                 Log "(don't understand /proc/cpuinfo) ";
  90                         }
  91                 }
  92                 return $arch ? $arch : "i386";
  93         } elsif ($mach =~ /^(x86[_-]|amd)64$/) {
  94                 Set("CPU_AMD64");
  95                 Set("CPU_64BIT_POINTERS");
  96                 Set("CPU_LITTLE_ENDIAN");
  97                 UnSet("CPU_BIG_ENDIAN");
  98                 Set("CPU_ALLOW_UNALIGNED");
  99                 Set("CPU_STRUCT_ALIGN" => 8);
 100                 return "x86-64";
 101         } else {
 102                 return "unknown";
 103         }
 104 });
 105 if (Get("CPU_ARCH") eq "unknown") { Warn "CPU type not recognized, using defaults, keep fingers crossed."; }
 106
 107 ### Compiler and its Options ###
 108
 109 # C flags: tell the compiler we're speaking C99
 110 Set("CLANG" => "-std=gnu99");
 111
 112 # C optimizations
 113 Set("COPT" => '-O2');
 114 Append("COPT", '-march=$(CPU_ARCH)') if IsSet("CPU_ARCH");
 115
 116 # C optimizations for highly exposed code
 117 Set("COPT2" => '-O3');
 118
 119 # Warnings
 120 Set("CWARNS" => '-Wall -W -Wno-parentheses -Wstrict-prototypes -Wmissing-prototypes -Winline');
 121 Set("CWARNS_OFF" => '');
 122
 123 # Linker flags
 124 Set("LOPT" => "");
 125
 126 # Extra libraries
 127 Set("LIBS" => "");
 128
 129 # Extra flags for compiling and linking shared libraries
 130 Set("CSHARED" => '-fPIC');
 131 Set("LSHARED" => '-shared -Wl,-soname,lib/$(@F)');
 132
 133 # Extra switches depending on GCC version:
 134 if ($gccver == 3000) {
 135         Append("COPT" => "-fstrict-aliasing");
 136 } elsif ($gccver == 3003) {
 137         Append("CWARNS" => "-Wundef -Wredundant-decls");
 138         Append("COPT" => "-finline-limit=20000 --param max-inline-insns-auto=1000");
 139 } elsif ($gccver == 3004) {
 140         Append("CWARNS" => "-Wundef -Wredundant-decls");
 141         Append("COPT" => "-finline-limit=5000 --param large-function-insns=5000 --param inline-unit-growth=200 --param large-function-growth=400");
 142 } elsif ($gccver == 4000) {
 143         Append("CWARNS" => "-Wundef -Wredundant-decls -Wno-pointer-sign -Wdisabled-optimization -Wno-missing-field-initializers");
 144         Append("CWARNS_OFF" => "-Wno-pointer-sign");
 145         Append("COPT" => "-finline-limit=5000 --param large-function-insns=5000 --param inline-unit-growth=200 --param large-function-growth=400");
 146 } else {
 147         Warn "Don't know anything about this GCC version, using default switches.\n";
 148 }
 149
 150 if (IsSet("CONFIG_DEBUG")) {
 151         # If debugging:
 152         Set("DEBUG_ASSERTS");
 153         Set("DEBUG_DIE_BY_ABORT") if Get("CONFIG_DEBUG") > 1;
 154         Set("CDEBUG" => "-ggdb");
 155 } else {
 156         # If building a release version:
 157         Append("COPT" => "-fomit-frame-pointer");
 158         Append("LOPT" => "-s");
 159 }
 160
 161 # If debugging memory allocations:
 162 #LIBS+=-lefence
 163 #CDEBUG+=-DDEBUG_DMALLOC
 164 #LIBS+=-ldmalloc
 165
 166 # Return success
 167 1;