acinclude.m4

   1 # A few convenience macros for Mesa, mostly to keep all the platform
   2 # specifics out of configure.ac.
   3
   4 # MESA_PIC_FLAGS()
   5 #
   6 # Find out whether to build PIC code using the option --enable-pic and
   7 # the configure enable_static/enable_shared settings. If PIC is needed,
   8 # figure out the necessary flags for the platform and compiler.
   9 #
  10 # The platform checks have been shamelessly taken from libtool and
  11 # stripped down to just what's needed for Mesa. See _LT_COMPILER_PIC in
  12 # /usr/share/aclocal/libtool.m4 or
  13 # http://git.savannah.gnu.org/gitweb/?p=libtool.git;a=blob;f=libltdl/m4/libtool.m4;hb=HEAD
  14 #
  15 AC_DEFUN([MESA_PIC_FLAGS],
  16 [AC_REQUIRE([AC_PROG_CC])dnl
  17 AC_ARG_VAR([PIC_FLAGS], [compiler flags for PIC code])
  18 AC_ARG_ENABLE([pic],
  19     [AS_HELP_STRING([--disable-pic],
  20         [compile PIC objects @<:@default=enabled for shared builds
  21         on supported platforms@:>@])],
  22     [enable_pic="$enableval"
  23     test "x$enable_pic" = x && enable_pic=auto],
  24     [enable_pic=auto])
  25 # disable PIC by default for static builds
  26 if test "$enable_pic" = auto && test "$enable_static" = yes; then
  27     enable_pic=no
  28 fi
  29 # if PIC hasn't been explicitly disabled, try to figure out the flags
  30 if test "$enable_pic" != no; then
  31     AC_MSG_CHECKING([for $CC option to produce PIC])
  32     # allow the user's flags to override
  33     if test "x$PIC_FLAGS" = x; then
  34         # see if we're using GCC
  35         if test "x$GCC" = xyes; then
  36             case "$host_os" in
  37             aix*|beos*|cygwin*|irix5*|irix6*|osf3*|osf4*|osf5*)
  38                 # PIC is the default for these OSes.
  39                 ;;
  40             mingw*|os2*|pw32*)
  41                 # This hack is so that the source file can tell whether
  42                 # it is being built for inclusion in a dll (and should
  43                 # export symbols for example).
  44                 PIC_FLAGS="-DDLL_EXPORT"
  45                 ;;
  46             darwin*|rhapsody*)
  47                 # PIC is the default on this platform
  48                 # Common symbols not allowed in MH_DYLIB files
  49                 PIC_FLAGS="-fno-common"
  50                 ;;
  51             hpux*)
  52                 # PIC is the default for IA64 HP-UX and 64-bit HP-UX,
  53                 # but not for PA HP-UX.
  54                 case $host_cpu in
  55                 hppa*64*|ia64*)
  56                     ;;
  57                 *)
  58                     PIC_FLAGS="-fPIC"
  59                     ;;
  60                 esac
  61                 ;;
  62             *)
  63                 # Everyone else on GCC uses -fPIC
  64                 PIC_FLAGS="-fPIC"
  65                 ;;
  66             esac
  67         else # !GCC
  68             case "$host_os" in
  69             hpux9*|hpux10*|hpux11*)
  70                 # PIC is the default for IA64 HP-UX and 64-bit HP-UX,
  71                 # but not for PA HP-UX.
  72                 case "$host_cpu" in
  73                 hppa*64*|ia64*)
  74                     # +Z the default
  75                     ;;
  76                 *)
  77                     PIC_FLAGS="+Z"
  78                     ;;
  79                 esac
  80                 ;;
  81             linux*|k*bsd*-gnu)
  82                 case `basename "$CC"` in
  83                 icc*|ecc*|ifort*)
  84                     PIC_FLAGS="-KPIC"
  85                     ;;
  86                 pgcc*|pgf77*|pgf90*|pgf95*)
  87                     # Portland Group compilers (*not* the Pentium gcc
  88                     # compiler, which looks to be a dead project)
  89                     PIC_FLAGS="-fpic"
  90                     ;;
  91                 ccc*)
  92                     # All Alpha code is PIC.
  93                     ;;
  94                 xl*)
  95                     # IBM XL C 8.0/Fortran 10.1 on PPC
  96                     PIC_FLAGS="-qpic"
  97                     ;;
  98                 *)
  99                     case `$CC -V 2>&1 | sed 5q` in
 100                     *Sun\ C*|*Sun\ F*)
 101                         # Sun C 5.9 or Sun Fortran
 102                         PIC_FLAGS="-KPIC"
 103                         ;;
 104                     esac
 105                 esac
 106                 ;;
 107             solaris*)
 108                 PIC_FLAGS="-KPIC"
 109                 ;;
 110             sunos4*)
 111                 PIC_FLAGS="-PIC"
 112                 ;;
 113             esac
 114         fi # GCC
 115     fi # PIC_FLAGS
 116     AC_MSG_RESULT([$PIC_FLAGS])
 117 fi
 118 AC_SUBST([PIC_FLAGS])
 119 ])# MESA_PIC_FLAGS