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# A few convenience macros for Mesa, mostly to keep all the platform
# specifics out of configure.ac.
# MESA_PIC_FLAGS()
#
# Find out whether to build PIC code using the option --enable-pic and
# the configure enable_static/enable_shared settings. If PIC is needed,
# figure out the necessary flags for the platform and compiler.
#
# The platform checks have been shamelessly taken from libtool and
# stripped down to just what's needed for Mesa. See _LT_COMPILER_PIC in
# /usr/share/aclocal/libtool.m4 or
# http://git.savannah.gnu.org/gitweb/?p=libtool.git;a=blob;f=libltdl/m4/libtool.m4;hb=HEAD
#
AC_DEFUN([MESA_PIC_FLAGS],
[AC_REQUIRE([AC_PROG_CC])dnl
AC_ARG_VAR([PIC_FLAGS], [compiler flags for PIC code])
AC_ARG_ENABLE([pic],
[AS_HELP_STRING([--disable-pic],
[compile PIC objects @<:@default=enabled for shared builds
on supported platforms@:>@])],
[enable_pic="$enableval"
test "x$enable_pic" = x && enable_pic=auto],
[enable_pic=auto])
# disable PIC by default for static builds
if test "$enable_pic" = auto && test "$enable_static" = yes; then
enable_pic=no
fi
# if PIC hasn't been explicitly disabled, try to figure out the flags
if test "$enable_pic" != no; then
AC_MSG_CHECKING([for $CC option to produce PIC])
# allow the user's flags to override
if test "x$PIC_FLAGS" = x; then
# see if we're using GCC
if test "x$GCC" = xyes; then
case "$host_os" in
aix*|beos*|cygwin*|irix5*|irix6*|osf3*|osf4*|osf5*)
# PIC is the default for these OSes.
;;
mingw*|os2*|pw32*)
# This hack is so that the source file can tell whether
# it is being built for inclusion in a dll (and should
# export symbols for example).
PIC_FLAGS="-DDLL_EXPORT"
;;
darwin*|rhapsody*)
# PIC is the default on this platform
# Common symbols not allowed in MH_DYLIB files
PIC_FLAGS="-fno-common"
;;
hpux*)
# PIC is the default for IA64 HP-UX and 64-bit HP-UX,
# but not for PA HP-UX.
case $host_cpu in
hppa*64*|ia64*)
;;
*)
PIC_FLAGS="-fPIC"
;;
esac
;;
*)
# Everyone else on GCC uses -fPIC
PIC_FLAGS="-fPIC"
;;
esac
else # !GCC
case "$host_os" in
hpux9*|hpux10*|hpux11*)
# PIC is the default for IA64 HP-UX and 64-bit HP-UX,
# but not for PA HP-UX.
case "$host_cpu" in
hppa*64*|ia64*)
# +Z the default
;;
*)
PIC_FLAGS="+Z"
;;
esac
;;
linux*|k*bsd*-gnu)
case `basename "$CC"` in
icc*|ecc*|ifort*)
PIC_FLAGS="-KPIC"
;;
pgcc*|pgf77*|pgf90*|pgf95*)
# Portland Group compilers (*not* the Pentium gcc
# compiler, which looks to be a dead project)
PIC_FLAGS="-fpic"
;;
ccc*)
# All Alpha code is PIC.
;;
xl*)
# IBM XL C 8.0/Fortran 10.1 on PPC
PIC_FLAGS="-qpic"
;;
*)
case `$CC -V 2>&1 | sed 5q` in
*Sun\ C*|*Sun\ F*)
# Sun C 5.9 or Sun Fortran
PIC_FLAGS="-KPIC"
;;
esac
esac
;;
solaris*)
PIC_FLAGS="-KPIC"
;;
sunos4*)
PIC_FLAGS="-PIC"
;;
esac
fi # GCC
fi # PIC_FLAGS
AC_MSG_RESULT([$PIC_FLAGS])
fi
AC_SUBST([PIC_FLAGS])
])# MESA_PIC_FLAGS
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