configure.ac (HAVE_AS_IX86_DIFF_SECT_DELTA): New test to determine whether the…

configure.ac (HAVE_AS_IX86_DIFF_SECT_DELTA): New test to determine whether the assembler supports taking the difference of...


	* configure.ac (HAVE_AS_IX86_DIFF_SECT_DELTA): New test to determine
	whether the assembler supports taking the difference of symbols in
	different sections.  On x86/Solaris, GAS does but Solaris as doesn't.
	* configure: Regenerate.
	* config.in: Regenerate.
	* config/i386/sol2-10.h (JUMP_TABLES_IN_TEXT_SECTION): Define if
	the assembler doesn't support taking the difference of symbols in
	different sections, i.e. we're using the native solaris assembler.

From-SVN: r118405

gcc/ChangeLog

+2006-11-01  Roger Sayle  <roger@eyesopen.com>
+
+	* configure.ac (HAVE_AS_IX86_DIFF_SECT_DELTA): New test to determine
+	whether the assembler supports taking the difference of symbols in
+	different sections.  On x86/Solaris, GAS does but Solaris as doesn't.
+	* configure: Regenerate.
+	* config.in: Regenerate.
+	* config/i386/sol2-10.h (JUMP_TABLES_IN_TEXT_SECTION): Define if
+	the assembler doesn't support taking the difference of symbols in
+	different sections, i.e. we're using the native solaris assembler.
+
 2006-11-01  Pete Steinmetz  <steinmtz@us.ibm.com>
 	    Peter Bergner  <bergner@vnet.ibm.com>
 

gcc/config.in

@@ -203,6 +203,13 @@
 #endif
 
 
+/* Define if your assembler supports the subtraction of symbols in different
+   sections. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_IX86_DIFF_SECT_DELTA
+#endif
+
+
 /* Define if your assembler supports the ffreep mnemonic. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_IX86_FFREEP

gcc/config/i386/sol2-10.h

 /* Solaris 10 configuration.
-   Copyright (C) 2004 Free Software Foundation, Inc.
+   Copyright (C) 2004, 2006 Free Software Foundation, Inc.
    Contributed by CodeSourcery, LLC.
 
 This file is part of GCC.
@@ -34,6 +34,14 @@ Boston, MA 02110-1301, USA.  */
 		 "-s %(asm_cpu)"
 #endif
 
+/* The native Solaris assembler can't calculate the difference between
+   symbols in different sections, which causes problems for -fPIC jump
+   tables in .rodata.  */
+#ifndef HAVE_AS_IX86_DIFF_SECT_DELTA
+#undef JUMP_TABLES_IN_TEXT_SECTION
+#define JUMP_TABLES_IN_TEXT_SECTION 1
+#endif
+
 #undef NO_PROFILE_COUNTERS
 
 #undef MCOUNT_NAME

gcc/configure

@@ -15253,6 +15253,45 @@ _ACEOF
 
 fi
 
+    echo "$as_me:$LINENO: checking assembler for different section symbol subtraction" >&5
+echo $ECHO_N "checking assembler for different section symbol subtraction... $ECHO_C" >&6
+if test "${gcc_cv_as_ix86_diff_sect_delta+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  gcc_cv_as_ix86_diff_sect_delta=no
+  if test x$gcc_cv_as != x; then
+    echo '.section .rodata
+.L1:
+        .long .L2-.L1
+        .long .L3-.L1
+        .text
+.L3:    nop
+.L2:    nop' > conftest.s
+    if { ac_try='$gcc_cv_as  -o conftest.o conftest.s >&5'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }
+    then
+	gcc_cv_as_ix86_diff_sect_delta=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+echo "$as_me:$LINENO: result: $gcc_cv_as_ix86_diff_sect_delta" >&5
+echo "${ECHO_T}$gcc_cv_as_ix86_diff_sect_delta" >&6
+if test $gcc_cv_as_ix86_diff_sect_delta = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_AS_IX86_DIFF_SECT_DELTA 1
+_ACEOF
+
+fi
+
     # This one is used unconditionally by i386.[ch]; it is to be defined
     # to 1 if the feature is present, 0 otherwise.
     echo "$as_me:$LINENO: checking assembler for GOTOFF in data" >&5

gcc/configure.ac

@@ -2850,6 +2850,18 @@ foo:	nop
       [AC_DEFINE(HAVE_AS_IX86_FFREEP, 1,
         [Define if your assembler supports the ffreep mnemonic.])])
 
+    gcc_GAS_CHECK_FEATURE([different section symbol subtraction],
+      gcc_cv_as_ix86_diff_sect_delta,,,
+      [.section .rodata
+.L1:
+        .long .L2-.L1
+        .long .L3-.L1
+        .text
+.L3:    nop
+.L2:    nop],,
+      [AC_DEFINE(HAVE_AS_IX86_DIFF_SECT_DELTA, 1,
+        [Define if your assembler supports the subtraction of symbols in different sections.])])
+
     # This one is used unconditionally by i386.[ch]; it is to be defined
     # to 1 if the feature is present, 0 otherwise.
     gcc_GAS_CHECK_FEATURE([GOTOFF in data],