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