re PR driver/49371 (xgcc: error: unrecognized option '-pie' on *-apple-darwin*)

	PR driver/49371
	* config/darwin.c (darwin_override_options): Improve warning when
	mdynamic-no-pic is given together with fPIC/fpic, also warn when it
	is given with fpie/fPIE.
	* config/darwin.h (PIE_SPEC): New, (LINK_SPEC): Use PIE_SPEC.
	* config/darwin9.h (PIE_SPEC): New.

From-SVN: r175397

gcc/ChangeLog

+2011-06-25  Iain Sandoe  <iains@gcc.gnu.org>
+
+	PR driver/49371
+	* config/darwin.c (darwin_override_options): Improve warning when
+	mdynamic-no-pic is given together with fPIC/fpic, also warn when it
+	is given with fpie/fPIE.
+	* config/darwin.h (PIE_SPEC): New, (LINK_SPEC): Use PIE_SPEC.
+	* config/darwin9.h (PIE_SPEC): New.
 
 2011-06-25  Basile Starynkevitch  <basile@starynkevitch.net>
 

gcc/config/darwin.c

@@ -2932,7 +2932,9 @@ darwin_override_options (void)
   if (MACHO_DYNAMIC_NO_PIC_P)
     {
       if (flag_pic)
-	warning (0, "-mdynamic-no-pic overrides -fpic or -fPIC");
+	warning_at (UNKNOWN_LOCATION, 0,
+		 "%<-mdynamic-no-pic%> overrides %<-fpic%>, %<-fPIC%>,"
+		 " %<-fpie%> or %<-fPIE%>");
       flag_pic = 0;
     }
   else if (flag_pic == 1)

gcc/config/darwin.h

@@ -226,6 +226,8 @@ extern GTY(()) int darwin_ms_struct;
 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
 #endif
 
+#define PIE_SPEC "%{fpie|pie|fPIE:}"
+
 /* Please keep the random linker options in alphabetical order (modulo
    'Z' and 'no' prefixes). Note that options taking arguments may appear
    multiple times on a command line with different arguments each time,
@@ -290,7 +292,7 @@ extern GTY(()) int darwin_ms_struct;
      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
-   %{fpie:-pie} \
+   " PIE_SPEC " \
    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
    %{read_only_relocs} \
    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \

gcc/config/darwin9.h

@@ -35,6 +35,12 @@ along with GCC; see the file COPYING3.  If not see
 /* Tell collect2 to run dsymutil for us as necessary.  */
 #define COLLECT_RUN_DSYMUTIL 1
 
+#undef PIE_SPEC
+#define PIE_SPEC \
+  "%{fpie|pie|fPIE: \
+     %{mdynamic-no-pic: %n'-mdynamic-no-pic' overrides '-pie', '-fpie' or '-fPIE'; \
+      :-pie}}"
+
 #undef  ASM_OUTPUT_ALIGNED_COMMON
 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)		\
   do {									\