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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [config/] [picflag.m4] - Blame information for rev 299

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1 161 khays
# _GCC_PICFLAG(FLAG, DISPATCH)
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# ----------------------------
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# Store PIC flag corresponding to DISPATCH triplet in FLAG.
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# Explit use of -fpic in CFLAGS corresponding to FLAG overrides default.
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AC_DEFUN([_GCC_PICFLAG], [
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case "${$2}" in
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    # PIC is the default on some targets or must not be used.
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    *-*-darwin*)
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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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        $1=-fno-common
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        ;;
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    alpha*-dec-osf5*)
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        # PIC is the default.
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        ;;
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    hppa*64*-*-hpux*)
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        # PIC is the default for 64-bit PA HP-UX.
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        ;;
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    i[[34567]]86-*-cygwin* | i[[34567]]86-*-mingw* | x86_64-*-mingw*)
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        ;;
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    i[[34567]]86-*-interix3*)
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        # Interix 3.x gcc -fpic/-fPIC options generate broken code.
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        # Instead, we relocate shared libraries at runtime.
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        ;;
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    i[[34567]]86-*-nto-qnx*)
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        # QNX uses GNU C++, but need to define -shared option too, otherwise
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        # it will coredump.
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        $1='-fPIC -shared'
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        ;;
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    i[[34567]]86-pc-msdosdjgpp*)
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        # DJGPP does not support shared libraries at all.
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        ;;
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    ia64*-*-hpux*)
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        # On IA64 HP-UX, PIC is the default but the pic flag
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        # sets the default TLS model and affects inlining.
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        $1=-fPIC
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        ;;
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    mips-sgi-irix6*)
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        # PIC is the default.
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        ;;
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    rs6000-ibm-aix* | powerpc-ibm-aix*)
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        # All AIX code is PIC.
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        ;;
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    # Some targets support both -fPIC and -fpic, but prefer the latter.
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    # FIXME: Why?
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    i[[34567]]86-*-* | x86_64-*-*)
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        $1=-fpic
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        ;;
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    m68k-*-*)
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        $1=-fpic
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        ;;
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    s390*-*-*)
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        $1=-fpic
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        ;;
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    # FIXME: Override -fPIC default in libgcc only?
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    sh-*-linux* | sh[[2346lbe]]*-*-linux*)
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        $1=-fpic
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        ;;
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    # FIXME: Simplify to sh*-*-netbsd*?
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    sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \
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      sh64-*-netbsd* | sh64l*-*-netbsd*)
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        $1=-fpic
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        ;;
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    # Default to -fPIC unless specified otherwise.
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    *)
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        $1=-fPIC
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        ;;
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esac
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# If the user explicitly uses -fpic/-fPIC, keep that.
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case "${m4_bpatsubsts($1, PICFLAG, CFLAGS)}" in
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    *-fpic*)
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        $1=-fpic
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        ;;
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    *-fPIC*)
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        $1=-fPIC
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        ;;
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esac
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])
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# GCC_PICFLAG
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# -----------
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# Store host PIC flag in PICFLAG.
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AC_DEFUN([GCC_PICFLAG], [
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  AC_REQUIRE([AC_CANONICAL_HOST])
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  _GCC_PICFLAG([PICFLAG], [host])])
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# GCC_PICFLAG_FOR_TARGET
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# ----------------------
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# Store target PIC flag in PICFLAG_FOR_TARGET.
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AC_DEFUN([GCC_PICFLAG_FOR_TARGET], [
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  AC_REQUIRE([AC_CANONICAL_TARGET])
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  _GCC_PICFLAG([PICFLAG_FOR_TARGET], [target])])

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