| Dan Nicholson | d368eed | 2008-05-05 18:24:21 -0700 | [diff] [blame] | 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 |