re PR other/7956 (unreadable error on -m64 with --disable-multilib)

	PR other/7956
	* genmultilib: New variable disable_multilib.  Set it to 'yes'
	if enable_multilib was set to 'no'.  Emit DISABLE_MULTILIB
	if disable_multilib was set to 'yes'.
	* gcc.c: Include multilib.h before tm.h.
	* config/sparc/sol2-bi.h (LINK_ARCH_SPEC): Emit an error
	message for multiarch options if DISABLE_MULTILIB is set.
	* config/sparc/sol2-gld-bi.h (LINK_ARCH_SPEC): Likewise.

From-SVN: r74875

gcc/ChangeLog

 2003-12-20  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
+	PR other/7956
+	* genmultilib: New variable disable_multilib.  Set it to 'yes'
+	if enable_multilib was set to 'no'.  Emit DISABLE_MULTILIB
+	if disable_multilib was set to 'yes'.
+	* gcc.c: Include multilib.h before tm.h.
+	* config/sparc/sol2-bi.h (LINK_ARCH_SPEC): Emit an error
+	message for multiarch options if DISABLE_MULTILIB is set.
+	* config/sparc/sol2-gld-bi.h (LINK_ARCH_SPEC): Likewise.
+
+2003-12-20  Eric Botcazou  <ebotcazou@libertysurf.fr>
+
 	PR c/12085
 	* c-typeck.c (build_function_call): Issue a warning if a
 	function is called through an incompatible prototype and

gcc/config/sparc/sol2-bi.h

@@ -149,11 +149,27 @@
 #define LINK_ARCH64_SPEC LINK_ARCH64_SPEC_BASE
 
 #undef LINK_ARCH_SPEC
+#if DISABLE_MULTILIB
+#if DEFAULT_ARCH32_P
 #define LINK_ARCH_SPEC "\
 %{m32:%(link_arch32)} \
+%{m64:%edoes not support multilib} \
+%{!m32:%{!m64:%(link_arch_default)}} \
+"
+#else
+#define LINK_ARCH_SPEC "\
+%{m32:%edoes not support multilib} \
 %{m64:%(link_arch64)} \
 %{!m32:%{!m64:%(link_arch_default)}} \
 "
+#endif
+#else
+#define LINK_ARCH_SPEC "\
+%{m32:%(link_arch32)} \
+%{m64:%(link_arch64)} \
+%{!m32:%{!m64:%(link_arch_default)}} \
+"
+#endif
 
 #define LINK_ARCH_DEFAULT_SPEC \
 (DEFAULT_ARCH32_P ? LINK_ARCH32_SPEC : LINK_ARCH64_SPEC)

gcc/config/sparc/sol2-gld-bi.h

@@ -10,9 +10,25 @@
   LINK_ARCH64_SPEC_BASE "%{!static: -rpath-link %R/usr/lib/sparcv9}"
 
 #undef LINK_ARCH_SPEC
+#if DISABLE_MULTILIB
+#if DEFAULT_ARCH32_P
+#define LINK_ARCH_SPEC "\
+%{m32:-m elf32_sparc %(link_arch32)} \
+%{m64:%edoes not support multilib} \
+%{!m32:%{!m64:%(link_arch_default)}} \
+"
+#else
+#define LINK_ARCH_SPEC "\
+%{m32:%edoes not support multilib} \
+%{m64:-m elf64_sparc %(link_arch64)} \
+%{!m32:%{!m64:%(link_arch_default)}} \
+"
+#endif
+#else
 #define LINK_ARCH_SPEC "\
 %{m32:-m elf32_sparc %(link_arch32)} \
 %{m64:-m elf64_sparc %(link_arch64)} \
 %{!m32:%{!m64:%(link_arch_default)}} \
 "
+#endif
 

gcc/gcc.c

@@ -73,6 +73,7 @@ compilation is specified by a string called a "spec".  */
 #include "config.h"
 #include "system.h"
 #include "coretypes.h"
+#include "multilib.h" /* before tm.h */
 #include "tm.h"
 #include <signal.h>
 #if ! defined( SIGCHLD ) && defined( SIGCLD )
@@ -791,7 +792,6 @@ static const char *multilib_select;
 static const char *multilib_matches;
 static const char *multilib_defaults;
 static const char *multilib_exclusions;
-#include "multilib.h"
 
 /* Check whether a particular argument is a default argument.  */
 

gcc/genmultilib

@@ -323,6 +323,7 @@ for combo in ${combinations}; do
     osdirout=`echo ${osdirout} | sed -e 's|^/||' -e 's|/$||g'`
     if [ "x${enable_multilib}" != xyes ]; then
       dirout=".:${osdirout}"
+      disable_multilib=yes
     else
       case "${osdirout}" in
         !*)
@@ -403,6 +404,12 @@ moptions=`echo ${options} | sed -e 's,[ 	][ 	]*, ,g'`
 echo ""
 echo "static const char *multilib_options = \"${moptions}\";"
 
+# Finally output the disable flag if specified
+if [ "x${disable_multilib}" = xyes ]; then
+  echo ""
+  echo "#define DISABLE_MULTILIB  1"
+fi
+
 cd ..
 rm -r tmpmultilib.$$