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("ARCH", "Checking for machine 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$/) {
  43                 return "i386";
  44         } elsif ($mach =~ /^(x86[_-]|amd)64$/) {
  45                 return "amd64";
  46         } else {
  47                 return "unknown";
  48         }
  49 });
  50
  51 Test("CPU_ARCH", "Checking for CPU architecture", sub {
  52         my $mach = Get("ARCH");
  53         if ($mach eq "i386") {
  54                 Set("CPU_I386");
  55                 UnSet("CPU_64BIT_POINTERS");
  56                 Set("CPU_LITTLE_ENDIAN");
  57                 UnSet("CPU_BIG_ENDIAN");
  58                 Set("CPU_ALLOW_UNALIGNED");
  59                 Set("CPU_STRUCT_ALIGN" => 4);
  60                 my $arch = "";
  61                 if (IsSet("CONFIG_EXACT_CPU") && IsSet("CONFIG_LINUX") && open X, "/proc/cpuinfo") {
  62                         my %pc = ();
  63                         while (<X>) {
  64                                 chomp;
  65                                 /^$/ && last;
  66                                 /^([^\t]+)\t+:\s*(.*)$/ and $pc{$1}=$2;
  67                         }
  68                         close X;
  69
  70                         # Try to understand CPU vendor, family and model [inspired by MPlayer's configure script]
  71                         my $vendor = $pc{'vendor_id'} || "";
  72                         my $family = $pc{'cpu family'} || 0;
  73                         my $model  = $pc{'model'} || 0;
  74                         if ($vendor eq "AuthenticAMD") {
  75                                 if ($family >= 6) {
  76                                         if ($model >= 31 && $gccver >= 3004) { $arch = "athlon64"; }
  77                                         elsif ($model >= 6 && $gccver >= 3003) { $arch = "athlon-xp"; }
  78                                         else { $arch = "athlon"; }
  79                                 }
  80                         } elsif ($vendor eq "GenuineIntel") {
  81                                 # We don't recognize Prescott and Nocona cores yet (gcc-3.4+)
  82                                 if ($family >= 15 && $gccver >= 3003) { $arch = "pentium4"; }
  83                                 elsif ($family >= 6 && $gccver >= 3003) {
  84                                         if ($model >= 7) { $arch = "pentium3"; }
  85                                         elsif ($model >= 3) { $arch = "pentium2"; }
  86                                 }
  87                         }
  88
  89                         # No match on vendor, try the family
  90                         if ($arch eq "") {
  91                                 if ($family >= 6) {
  92                                         $arch = "i686";
  93                                 } elsif ($family >= 3) {
  94                                         $arch = "i${family}86";
  95                                 }
  96                         }
  97                         if ($arch ne "") {
  98                                 Log "(using /proc/cpuinfo) ";
  99                         } else {
 100                                 Log "(don't understand /proc/cpuinfo) ";
 101                         }
 102                 }
 103                 return $arch ? $arch : "i386";
 104         } elsif ($mach eq "amd64") {
 105                 Set("CPU_AMD64");
 106                 Set("CPU_64BIT_POINTERS");
 107                 Set("CPU_LITTLE_ENDIAN");
 108                 UnSet("CPU_BIG_ENDIAN");
 109                 Set("CPU_ALLOW_UNALIGNED");
 110                 Set("CPU_STRUCT_ALIGN" => 8);
 111                 return "x86-64";
 112         } else {
 113                 return undef;
 114         }
 115 });
 116
 117 if (!IsSet("CPU_ARCH")) { Warn "CPU type not recognized, using defaults, keep fingers crossed."; }
 118
 119 ### Compiler and its Options ###
 120
 121 # C flags: tell the compiler we're speaking C99
 122 Set("CLANG" => "-std=gnu99");
 123
 124 # C optimizations
 125 Set("COPT" => '-O2');
 126 Append("COPT", '-march=$(CPU_ARCH)') if IsSet("CPU_ARCH");
 127
 128 # C optimizations for highly exposed code
 129 Set("COPT2" => '-O3');
 130
 131 # Warnings
 132 Set("CWARNS" => '-Wall -W -Wno-parentheses -Wstrict-prototypes -Wmissing-prototypes -Winline');
 133 Set("CWARNS_OFF" => '');
 134
 135 # Linker flags
 136 Set("LOPT" => "");
 137
 138 # Extra libraries
 139 Set("LIBS" => "");
 140
 141 # Extra flags for compiling and linking shared libraries
 142 Set("CSHARED" => '-fPIC');
 143 Set("LSHARED" => '-shared -Wl,-soname,lib/$(@F)');
 144
 145 # Extra switches depending on GCC version:
 146 if ($gccver == 3000) {
 147         Append("COPT" => "-fstrict-aliasing");
 148 } elsif ($gccver == 3003) {
 149         Append("CWARNS" => "-Wundef -Wredundant-decls");
 150         Append("COPT" => "-finline-limit=20000 --param max-inline-insns-auto=1000");
 151 } elsif ($gccver == 3004) {
 152         Append("CWARNS" => "-Wundef -Wredundant-decls");
 153         Append("COPT" => "-finline-limit=2000 --param large-function-insns=5000 --param inline-unit-growth=200 --param large-function-growth=400");
 154 } elsif ($gccver == 4000) {
 155         Append("CWARNS" => "-Wundef -Wredundant-decls -Wno-pointer-sign -Wdisabled-optimization -Wno-missing-field-initializers");
 156         Append("CWARNS_OFF" => "-Wno-pointer-sign");
 157         Append("COPT" => "-finline-limit=5000 --param large-function-insns=5000 --param inline-unit-growth=200 --param large-function-growth=400");
 158 } else {
 159         Warn "Don't know anything about this GCC version, using default switches.\n";
 160 }
 161
 162 if (IsSet("CONFIG_DEBUG")) {
 163         # If debugging:
 164         Set("DEBUG_ASSERTS");
 165         Set("DEBUG_DIE_BY_ABORT") if Get("CONFIG_DEBUG") > 1;
 166         Set("CDEBUG" => "-ggdb");
 167 } else {
 168         # If building a release version:
 169         Append("COPT" => "-fomit-frame-pointer");
 170         Append("LOPT" => "-s");
 171 }
 172
 173 # Decide how will lib/partmap.c work
 174 Set("PARTMAP_IS_MMAP") if IsSet("CPU_64BIT_POINTERS");
 175
 176 # If debugging memory allocations:
 177 #LIBS+=-lefence
 178 #CDEBUG+=-DDEBUG_DMALLOC
 179 #LIBS+=-ldmalloc
 180
 181 # Return success
 182 1;