newlib-cygwin/config/picflag.m4

93 lines
2.3 KiB
Plaintext
Raw Permalink Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

# _GCC_PICFLAG(FLAG, DISPATCH)
# ----------------------------
# Store PIC flag corresponding to DISPATCH triplet in FLAG.
# Explit use of -fpic in CFLAGS corresponding to FLAG overrides default.
AC_DEFUN([_GCC_PICFLAG], [
case "${$2}" in
# PIC is the default on some targets or must not be used.
*-*-darwin*)
# For darwin, common symbols are not allowed in MH_DYLIB files
case "${CFLAGS}" in
# If we are using a compiler supporting mdynamic-no-pic
# and the option has been tested as safe to add, then cancel
# it here, since the code generated is incompatible with shared
# libs.
*-mdynamic-no-pic*) $1='-fno-common -mno-dynamic-no-pic' ;;
*) $1=-fno-common ;;
esac
;;
alpha*-dec-osf5*)
# PIC is the default.
;;
hppa*64*-*-hpux*)
# PIC is the default for 64-bit PA HP-UX.
;;
i[[34567]]86-*-cygwin* | x86_64-*-cygwin*)
;;
i[[34567]]86-*-mingw* | x86_64-*-mingw*)
;;
i[[34567]]86-*-nto-qnx*)
# QNX uses GNU C++, but need to define -shared option too, otherwise
# it will coredump.
$1='-fPIC -shared'
;;
i[[34567]]86-pc-msdosdjgpp*)
# DJGPP does not support shared libraries at all.
;;
ia64*-*-hpux*)
# On IA64 HP-UX, PIC is the default but the pic flag
# sets the default TLS model and affects inlining.
$1=-fPIC
;;
mips-sgi-irix6*)
# PIC is the default.
;;
rs6000-ibm-aix* | powerpc-ibm-aix*)
# All AIX code is PIC.
;;
# Some targets support both -fPIC and -fpic, but prefer the latter.
# FIXME: Why?
i[[34567]]86-*-* | x86_64-*-*)
$1=-fpic
;;
# FIXME: Override -fPIC default in libgcc only?
sh-*-linux* | sh[[2346lbe]]*-*-linux*)
$1=-fpic
;;
# FIXME: Simplify to sh*-*-netbsd*?
sh-*-netbsdelf* | shl*-*-netbsdelf*)
$1=-fpic
;;
# Default to -fPIC unless specified otherwise.
*)
$1=-fPIC
;;
esac
# If the user explicitly uses -fpic/-fPIC, keep that.
case "${m4_bpatsubsts($1, PICFLAG, CFLAGS)}" in
*-fpic*)
$1=-fpic
;;
*-fPIC*)
$1=-fPIC
;;
esac
])
# GCC_PICFLAG
# -----------
# Store host PIC flag in PICFLAG.
AC_DEFUN([GCC_PICFLAG], [
AC_REQUIRE([AC_CANONICAL_HOST])
_GCC_PICFLAG([PICFLAG], [host])])
# GCC_PICFLAG_FOR_TARGET
# ----------------------
# Store target PIC flag in PICFLAG_FOR_TARGET.
AC_DEFUN([GCC_PICFLAG_FOR_TARGET], [
AC_REQUIRE([AC_CANONICAL_TARGET])
_GCC_PICFLAG([PICFLAG_FOR_TARGET], [target])])