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

6 files changed, 121 insertions, 16 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dd5531a..d11c5ce 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2011-08-22  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* configure.ac (GCC_PICFLAG_FOR_TARGET): Call it.
+	(PICFLAG_FOR_TARGET): Substitute.
+	* aclocal.m4: Regenerate.
+	* configure: Regenerate.
+
 2011-08-22  Dodji Seketeli  <dodji@redhat.com>
 
 	* c-family/c-pch.c (c_common_read_pch): Re-set line table right
diff --git a/gcc/aclocal.m4 b/gcc/aclocal.m4
index 1b90b2f..06028cc 100644
--- a/gcc/aclocal.m4
+++ b/gcc/aclocal.m4
@@ -114,6 +114,7 @@ m4_include([../config/lib-ld.m4])
 m4_include([../config/lib-link.m4])
 m4_include([../config/lib-prefix.m4])
 m4_include([../config/override.m4])
+m4_include([../config/picflag.m4])
 m4_include([../config/progtest.m4])
 m4_include([../config/stdint.m4])
 m4_include([../config/warnings.m4])
diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index caf5885..4b32ee7 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,12 @@
+2011-08-22  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* 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.
+
 2011-08-07  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gcc-interface/Makefile.in (raise-gcc.o): Fix previous change.
diff --git a/gcc/ada/gcc-interface/Makefile.in b/gcc/ada/gcc-interface/Makefile.in
index 6166001..0440855 100644
--- a/gcc/ada/gcc-interface/Makefile.in
+++ b/gcc/ada/gcc-interface/Makefile.in
@@ -111,10 +111,11 @@ NO_SIBLING_ADAFLAGS=-fno-optimize-sibling-calls
 NO_REORDER_ADAFLAGS=-fno-toplevel-reorder
 GNATLIBFLAGS = -gnatpg -nostdinc
 GNATLIBCFLAGS = -g -O2
+PICFLAG_FOR_TARGET = @PICFLAG_FOR_TARGET@
 # Pretend that _Unwind_GetIPInfo is available for the target by default.  This
 # should be autodetected during the configuration of libada and passed down to
 # here, but we need something for --disable-libada and hope for the best.
-GNATLIBCFLAGS_FOR_C = $(GNATLIBCFLAGS) $(TARGET_LIBGCC2_CFLAGS) -fexceptions \
+GNATLIBCFLAGS_FOR_C = $(GNATLIBCFLAGS) $(PICFLAG_FOR_TARGET) -fexceptions \
 	-DIN_RTS -DHAVE_GETIPINFO
 ALL_ADAFLAGS = $(CFLAGS) $(ADA_CFLAGS) $(ADAFLAGS)
 MOST_ADAFLAGS = $(CFLAGS) $(ADA_CFLAGS) $(SOME_ADAFLAGS)
@@ -2482,7 +2483,7 @@ gnatlib: ../stamp-gnatlib1-$(RTSDIR) ../stamp-gnatlib2-$(RTSDIR)
 gnatlib-shared-default:
 	$(MAKE) $(FLAGS_TO_PASS) \
              GNATLIBFLAGS="$(GNATLIBFLAGS)" \
-	     GNATLIBCFLAGS="$(GNATLIBCFLAGS) $(TARGET_LIBGCC2_CFLAGS)" \
+	     GNATLIBCFLAGS="$(GNATLIBCFLAGS) $(PICFLAG_FOR_TARGET)" \
 	     GNATLIBCFLAGS_FOR_C="$(GNATLIBCFLAGS_FOR_C)" \
 	     MULTISUBDIR="$(MULTISUBDIR)" \
 	     THREAD_KIND="$(THREAD_KIND)" \
@@ -2490,14 +2491,14 @@ gnatlib-shared-default:
 	$(RM) $(RTSDIR)/libgna*$(soext)
 	cd $(RTSDIR); `echo "$(GCC_FOR_TARGET)" \
                 | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -shared $(GNATLIBCFLAGS) \
-		$(TARGET_LIBGCC2_CFLAGS) \
+		$(PICFLAG_FOR_TARGET) \
 		-o libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
 		$(GNATRTL_NONTASKING_OBJS) $(LIBGNAT_OBJS) \
 		$(SO_OPTS)libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
 		$(MISCLIB) -lm
 	cd $(RTSDIR); `echo "$(GCC_FOR_TARGET)" \
                 | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -shared $(GNATLIBCFLAGS) \
-		$(TARGET_LIBGCC2_CFLAGS) \
+		$(PICFLAG_FOR_TARGET) \
 		-o libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
 		$(GNATRTL_TASKING_OBJS) \
 		$(SO_OPTS)libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
@@ -2529,7 +2530,7 @@ gnatlib-shared-dual:
 gnatlib-shared-dual-win32:
 	$(MAKE) $(FLAGS_TO_PASS) \
              GNATLIBFLAGS="$(GNATLIBFLAGS)" \
-	     GNATLIBCFLAGS="$(GNATLIBCFLAGS) $(TARGET_LIBGCC2_CFLAGS)" \
+	     GNATLIBCFLAGS="$(GNATLIBCFLAGS) $(PICFLAG_FOR_TARGET)" \
 	     GNATLIBCFLAGS_FOR_C="$(GNATLIBCFLAGS_FOR_C)" \
 	     MULTISUBDIR="$(MULTISUBDIR)" \
 	     THREAD_KIND="$(THREAD_KIND)" \
@@ -2552,7 +2553,7 @@ gnatlib-shared-dual-win32:
 gnatlib-shared-win32:
 	$(MAKE) $(FLAGS_TO_PASS) \
              GNATLIBFLAGS="$(GNATLIBFLAGS)" \
-	     GNATLIBCFLAGS="$(GNATLIBCFLAGS) $(TARGET_LIBGCC2_CFLAGS)" \
+	     GNATLIBCFLAGS="$(GNATLIBCFLAGS) $(PICFLAG_FOR_TARGET)" \
 	     GNATLIBCFLAGS_FOR_C="$(GNATLIBCFLAGS_FOR_C)" \
 	     MULTISUBDIR="$(MULTISUBDIR)" \
 	     THREAD_KIND="$(THREAD_KIND)" \
@@ -2560,13 +2561,13 @@ gnatlib-shared-win32:
 	$(RM) $(RTSDIR)/libgna*$(soext)
 	cd $(RTSDIR); `echo "$(GCC_FOR_TARGET)" \
                 | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -shared -shared-libgcc \
-		$(TARGET_LIBGCC2_CFLAGS) \
+		$(PICFLAG_FOR_TARGET) \
 		-o libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
 		$(GNATRTL_NONTASKING_OBJS) $(LIBGNAT_OBJS) \
 		$(SO_OPTS)libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) $(MISCLIB)
 	cd $(RTSDIR); `echo "$(GCC_FOR_TARGET)" \
                 | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -shared -shared-libgcc \
-		$(TARGET_LIBGCC2_CFLAGS) \
+		$(PICFLAG_FOR_TARGET) \
 		-o libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
 		$(GNATRTL_TASKING_OBJS) \
 		$(SO_OPTS)libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
@@ -2575,21 +2576,21 @@ gnatlib-shared-win32:
 gnatlib-shared-darwin:
 	$(MAKE) $(FLAGS_TO_PASS) \
 	     GNATLIBFLAGS="$(GNATLIBFLAGS)" \
-	     GNATLIBCFLAGS="$(GNATLIBCFLAGS) $(TARGET_LIBGCC2_CFLAGS)" \
+	     GNATLIBCFLAGS="$(GNATLIBCFLAGS) $(PICFLAG_FOR_TARGET)" \
 	     GNATLIBCFLAGS_FOR_C="$(GNATLIBCFLAGS_FOR_C) -fno-common" \
 	     MULTISUBDIR="$(MULTISUBDIR)" \
 	     THREAD_KIND="$(THREAD_KIND)" \
 	     gnatlib
 	$(RM) $(RTSDIR)/libgnat$(soext) $(RTSDIR)/libgnarl$(soext)
 	cd $(RTSDIR); `echo "$(GCC_FOR_TARGET)" \
-                | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -dynamiclib $(TARGET_LIBGCC2_CFLAGS) \
+                | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -dynamiclib $(PICFLAG_FOR_TARGET) \
 		-o libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
 		$(GNATRTL_NONTASKING_OBJS) $(LIBGNAT_OBJS) \
 		$(SO_OPTS) \
 		-Wl,-install_name,@rpath/libgnat$(hyphen)$(LIBRARY_VERSION)$(soext) \
 		$(MISCLIB) -lm
 	cd $(RTSDIR); `echo "$(GCC_FOR_TARGET)" \
-                | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -dynamiclib $(TARGET_LIBGCC2_CFLAGS) \
+                | sed -e 's,\./xgcc,../../xgcc,' -e 's,-B\./,-B../../,'` -dynamiclib $(PICFLAG_FOR_TARGET) \
 		-o libgnarl$(hyphen)$(LIBRARY_VERSION)$(soext) \
 		$(GNATRTL_TASKING_OBJS) \
 		$(SO_OPTS) \
@@ -2638,7 +2639,7 @@ gnatlib-shared:
 	     GNATLIBCFLAGS_FOR_C="$(GNATLIBCFLAGS_FOR_C)" \
 	     MULTISUBDIR="$(MULTISUBDIR)" \
 	     THREAD_KIND="$(THREAD_KIND)" \
-	     TARGET_LIBGCC2_CFLAGS="$(TARGET_LIBGCC2_CFLAGS)" \
+	     PICFLAG_FOR_TARGET="$(PICFLAG_FOR_TARGET)" \
              $(GNATLIB_SHARED)
 
 gnatlib-sjlj:
@@ -2653,7 +2654,7 @@ gnatlib-sjlj:
 	     GNATLIBCFLAGS_FOR_C="$(GNATLIBCFLAGS_FOR_C)" \
 	     MULTISUBDIR="$(MULTISUBDIR)" \
 	     THREAD_KIND="$(THREAD_KIND)" \
-	     TARGET_LIBGCC2_CFLAGS="$(TARGET_LIBGCC2_CFLAGS)" gnatlib
+	     PICFLAG_FOR_TARGET="$(PICFLAG_FOR_TARGET)" gnatlib
 
 gnatlib-zcx:
 	$(MAKE) $(FLAGS_TO_PASS) EH_MECHANISM="-gcc" \
@@ -2667,7 +2668,7 @@ gnatlib-zcx:
 	     GNATLIBCFLAGS_FOR_C="$(GNATLIBCFLAGS_FOR_C)" \
 	     MULTISUBDIR="$(MULTISUBDIR)" \
 	     THREAD_KIND="$(THREAD_KIND)" \
-	     TARGET_LIBGCC2_CFLAGS="$(TARGET_LIBGCC2_CFLAGS)" gnatlib
+	     PICFLAG_FOR_TARGET="$(PICFLAG_FOR_TARGET)" gnatlib
 
 # .s files for cross-building
 gnat-cross: force
diff --git a/gcc/configure b/gcc/configure
index 749dd2e..0feb911 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -784,6 +784,7 @@ loose_warn
 EGREP
 GREP
 CPP
+PICFLAG_FOR_TARGET
 OUTPUT_OPTION
 NO_MINUS_C_MINUS_O
 GNATMAKE
@@ -4873,6 +4874,88 @@ case "$CC" in
 esac
 
 
+# Determine PICFLAG for target gnatlib.
+
+
+
+
+case "${target}" in
+    # PIC is the default on some targets or must not be used.
+    *-*-darwin*)
+	# PIC is the default on this platform
+	# Common symbols not allowed in MH_DYLIB files
+	PICFLAG_FOR_TARGET=-fno-common
+	;;
+    alpha*-dec-osf5*)
+	# PIC is the default.
+	;;
+    hppa*64*-*-hpux*)
+	# PIC is the default for 64-bit PA HP-UX.
+	;;
+    i[34567]86-*-cygwin* | i[34567]86-*-mingw* | x86_64-*-mingw*)
+	;;
+    i[34567]86-*-interix3*)
+	# Interix 3.x gcc -fpic/-fPIC options generate broken code.
+	# Instead, we relocate shared libraries at runtime.
+	;;
+    i[34567]86-*-nto-qnx*)
+	# QNX uses GNU C++, but need to define -shared option too, otherwise
+	# it will coredump.
+	PICFLAG_FOR_TARGET='-fPIC -shared'
+	;;
+    i[34567]86-pc-msdosdjgpp*)
+	# DJGPP does not support shared libraries at all.
+	;;
+    ia64*-*-hpux*)
+	# On IA64 HP-UX, PIC is the default but the pic flag
+	# sets the default TLS model and affects inlining.
+	PICFLAG_FOR_TARGET=-fPIC
+	;;
+    mips-sgi-irix6*)
+	# PIC is the default.
+	;;
+    rs6000-ibm-aix* | powerpc-ibm-aix*)
+	# All AIX code is PIC.
+	;;
+
+    # Some targets support both -fPIC and -fpic, but prefer the latter.
+    # FIXME: Why?
+    i[34567]86-*-* | x86_64-*-*)
+	PICFLAG_FOR_TARGET=-fpic
+	;;
+    m68k-*-*)
+	PICFLAG_FOR_TARGET=-fpic
+	;;
+    s390*-*-*)
+	PICFLAG_FOR_TARGET=-fpic
+	;;
+    # FIXME: Override -fPIC default in libgcc only?
+    sh-*-linux* | sh[2346lbe]*-*-linux*)
+	PICFLAG_FOR_TARGET=-fpic
+	;;
+    # FIXME: Simplify to sh*-*-netbsd*?
+    sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \
+      sh64-*-netbsd* | sh64l*-*-netbsd*)
+	PICFLAG_FOR_TARGET=-fpic
+	;;
+    # Default to -fPIC unless specified otherwise.
+    *)
+	PICFLAG_FOR_TARGET=-fPIC
+	;;
+esac
+
+# If the user explicitly uses -fpic/-fPIC, keep that.
+case "${CFLAGS_FOR_TARGET}" in
+    *-fpic*)
+	PICFLAG_FOR_TARGET=-fpic
+	;;
+    *-fPIC*)
+	PICFLAG_FOR_TARGET=-fPIC
+	;;
+esac
+
+
+
 # -------------------------
 # Check C compiler features
 # -------------------------
@@ -17830,7 +17913,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 17833 "configure"
+#line 17916 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -17936,7 +18019,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 17939 "configure"
+#line 18022 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/gcc/configure.ac b/gcc/configure.ac
index ed01904..51ab3ac 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -297,6 +297,10 @@ case "$CC" in
 esac
 AC_SUBST(CFLAGS)
 
+# Determine PICFLAG for target gnatlib.
+GCC_PICFLAG_FOR_TARGET
+AC_SUBST(PICFLAG_FOR_TARGET)
+
 # -------------------------
 # Check C compiler features
 # -------------------------