Centralize PICFLAG configuration

	config:
	* picflag.m4: New file.

	gcc:
	* configure.ac (GCC_PICFLAG_FOR_TARGET): Call it.
	(PICFLAG_FOR_TARGET): Substitute.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.

	gcc/ada:
	* gcc-interface/Makefile.in (PICFLAG_FOR_TARGET): New.
	(GNATLIBCFLAGS_FOR_C): Replace
	TARGET_LIBGCC2_CFLAGS by PICFLAG_FOR_TARGET.
	(gnatlib-shared-default, gnatlib-shared-dual-win32)
	(gnatlib-shared-win32, gnatlib-shared-darwin, gnatlib-shared)
	(gnatlib-sjlj, gnatlib-zcx): Likewise.

	libada:
	* configure.ac: Include ../config/picflag.m4.
	(GCC_PICFLAG): Call it.
	Substitute.
	* configure: Regenerate.
	* Makefile.in (TARGET_LIBGCC2_CFLAGS): Replace by PICFLAG.
	(GNATLIBCFLAGS_FOR_C): Replace TARGET_LIBGCC2_CFLAGS by PICFLAG.
	(LIBADA_FLAGS_TO_PASS): Pass PICFLAG as PICFLAG_FOR_TARGET.
	Don't include $(GCC_DIR)/libgcc.mvars.

	libiberty:
	* aclocal.m4: Include ../config/picflag.m4.
	* configure.ac (GCC_PICFLAG): Call it.
	(enable_shared): Clear PICFLAG unless shared.
	* configure: Regenerate.

From-SVN: r177967

4 files changed, 102 insertions, 7 deletions

diff --git a/libada/ChangeLog b/libada/ChangeLog
index 321712898be..689e9fb1a32 100644
--- a/libada/ChangeLog
+++ b/libada/ChangeLog
@@ -1,3 +1,14 @@
+2011-08-22  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* configure.ac: Include ../config/picflag.m4.
+	(GCC_PICFLAG): Call it.
+	Substitute.
+	* configure: Regenerate.
+	* Makefile.in (TARGET_LIBGCC2_CFLAGS): Replace by PICFLAG.
+	(GNATLIBCFLAGS_FOR_C): Replace TARGET_LIBGCC2_CFLAGS by PICFLAG.
+	(LIBADA_FLAGS_TO_PASS): Pass PICFLAG as PICFLAG_FOR_TARGET.
+	Don't include $(GCC_DIR)/libgcc.mvars.
+
 2010-11-20  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
 	PR other/46202
diff --git a/libada/Makefile.in b/libada/Makefile.in
index cd518239b21..6f3df38c322 100644
--- a/libada/Makefile.in
+++ b/libada/Makefile.in
@@ -1,5 +1,5 @@
 # Makefile for libada.
-#   Copyright 2003, 2004, 2009, 2010 Free Software Foundation, Inc.
+#   Copyright 2003, 2004, 2009, 2010, 2011 Free Software Foundation, Inc.
 #
 # This file is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -56,15 +56,13 @@ LOOSE_WARN = -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
 GCC_WARN_CFLAGS = $(LOOSE_WARN)
 WARN_CFLAGS = @warn_cflags@
 
-TARGET_LIBGCC2_CFLAGS=
+PICFLAG = @PICFLAG@
 GNATLIBCFLAGS= -g -O2
-GNATLIBCFLAGS_FOR_C = $(GNATLIBCFLAGS) $(TARGET_LIBGCC2_CFLAGS) -fexceptions \
+GNATLIBCFLAGS_FOR_C = $(GNATLIBCFLAGS) $(PICFLAG) -fexceptions \
 	-DIN_RTS @have_getipinfo@
 
-# Get target-specific overrides for TARGET_LIBGCC2_CFLAGS.
 host_subdir = @host_subdir@
 GCC_DIR=$(MULTIBUILDTOP)../../$(host_subdir)/gcc
-include $(GCC_DIR)/libgcc.mvars
 
 target_noncanonical:=@target_noncanonical@
 version := $(shell cat $(srcdir)/../gcc/BASE-VER)
@@ -83,7 +81,7 @@ LIBADA_FLAGS_TO_PASS = \
         "GNATLIBFLAGS=$(GNATLIBFLAGS) $(MULTIFLAGS)" \
         "GNATLIBCFLAGS=$(GNATLIBCFLAGS) $(MULTIFLAGS)" \
         "GNATLIBCFLAGS_FOR_C=$(GNATLIBCFLAGS_FOR_C) $(MULTIFLAGS)" \
-        "TARGET_LIBGCC2_CFLAGS=$(TARGET_LIBGCC2_CFLAGS)" \
+        "PICFLAG_FOR_TARGET=$(PICFLAG)" \
         "THREAD_KIND=$(THREAD_KIND)" \
         "TRACE=$(TRACE)" \
         "MULTISUBDIR=$(MULTISUBDIR)" \
diff --git a/libada/configure b/libada/configure
index 4137364df21..c0a294fdd0c 100755
--- a/libada/configure
+++ b/libada/configure
@@ -558,6 +558,7 @@ have_getipinfo
 default_gnatlib_target
 LN_S
 AWK
+PICFLAG
 enable_shared
 OBJEXT
 EXEEXT
@@ -2817,6 +2818,87 @@ fi
 
 
 
+
+
+
+
+case "${host}" in
+    # PIC is the default on some targets or must not be used.
+    *-*-darwin*)
+	# PIC is the default on this platform
+	# Common symbols not allowed in MH_DYLIB files
+	PICFLAG=-fno-common
+	;;
+    alpha*-dec-osf5*)
+	# PIC is the default.
+	;;
+    hppa*64*-*-hpux*)
+	# PIC is the default for 64-bit PA HP-UX.
+	;;
+    i[34567]86-*-cygwin* | i[34567]86-*-mingw* | x86_64-*-mingw*)
+	;;
+    i[34567]86-*-interix3*)
+	# Interix 3.x gcc -fpic/-fPIC options generate broken code.
+	# Instead, we relocate shared libraries at runtime.
+	;;
+    i[34567]86-*-nto-qnx*)
+	# QNX uses GNU C++, but need to define -shared option too, otherwise
+	# it will coredump.
+	PICFLAG='-fPIC -shared'
+	;;
+    i[34567]86-pc-msdosdjgpp*)
+	# DJGPP does not support shared libraries at all.
+	;;
+    ia64*-*-hpux*)
+	# On IA64 HP-UX, PIC is the default but the pic flag
+	# sets the default TLS model and affects inlining.
+	PICFLAG=-fPIC
+	;;
+    mips-sgi-irix6*)
+	# PIC is the default.
+	;;
+    rs6000-ibm-aix* | powerpc-ibm-aix*)
+	# All AIX code is PIC.
+	;;
+
+    # Some targets support both -fPIC and -fpic, but prefer the latter.
+    # FIXME: Why?
+    i[34567]86-*-* | x86_64-*-*)
+	PICFLAG=-fpic
+	;;
+    m68k-*-*)
+	PICFLAG=-fpic
+	;;
+    s390*-*-*)
+	PICFLAG=-fpic
+	;;
+    # FIXME: Override -fPIC default in libgcc only?
+    sh-*-linux* | sh[2346lbe]*-*-linux*)
+	PICFLAG=-fpic
+	;;
+    # FIXME: Simplify to sh*-*-netbsd*?
+    sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \
+      sh64-*-netbsd* | sh64l*-*-netbsd*)
+	PICFLAG=-fpic
+	;;
+    # Default to -fPIC unless specified otherwise.
+    *)
+	PICFLAG=-fPIC
+	;;
+esac
+
+# If the user explicitly uses -fpic/-fPIC, keep that.
+case "${CFLAGS}" in
+    *-fpic*)
+	PICFLAG=-fpic
+	;;
+    *-fPIC*)
+	PICFLAG=-fPIC
+	;;
+esac
+
+
+
 # These must be passed down, or are needed by gcc/libgcc.mvars
 for ac_prog in gawk mawk nawk awk
 do
diff --git a/libada/configure.ac b/libada/configure.ac
index 3aa8a62a522..f9b9c5ab3b0 100644
--- a/libada/configure.ac
+++ b/libada/configure.ac
@@ -1,5 +1,5 @@
 # Configure script for libada.
-#   Copyright 2003, 2004, 2009 Free Software Foundation, Inc.
+#   Copyright 2003, 2004, 2009, 2011 Free Software Foundation, Inc.
 #
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -18,6 +18,7 @@
 sinclude(../config/acx.m4)
 sinclude(../config/multi.m4)
 sinclude(../config/override.m4)
+sinclude(../config/picflag.m4)
 sinclude(../config/unwind_ipinfo.m4)
 
 AC_INIT
@@ -118,6 +119,9 @@ esac
 ], [enable_shared=yes])
 AC_SUBST([enable_shared])
 
+GCC_PICFLAG
+AC_SUBST([PICFLAG])
+
 # These must be passed down, or are needed by gcc/libgcc.mvars
 AC_PROG_AWK
 AC_PROG_LN_S