re PR libgcj/44216 (All libjava tests fail on IRIX 6.5: ld warns about -no-merge-exidx-entries)

	PR libgcj/44216
	* configure.ac (libgcj_cv_exidx): Enable AC_LANG_WERROR.
	Save and restore werror flag.
	* configure: Regenerate.

From-SVN: r159833

libjava/ChangeLog

+2010-05-25  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	PR libgcj/44216
+	* configure.ac (libgcj_cv_exidx): Enable AC_LANG_WERROR.
+	Save and restore werror flag.
+	* configure: Regenerate.
+
 2010-05-04  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
 	PR other/43620

libjava/configure

@@ -599,6 +599,7 @@ ac_includes_default="\
 #endif"
 
 enable_option_checking=no
+ac_c_werror_flag=
 ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
@@ -13338,7 +13339,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 13341 "configure"
+#line 13342 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -13444,7 +13445,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 13447 "configure"
+#line 13448 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -19423,7 +19424,7 @@ if test "${enable_sjlj_exceptions+set}" = set; then :
   enableval=$enable_sjlj_exceptions; :
 else
   cat > conftest.$ac_ext << EOF
-#line 19426 "configure"
+#line 19427 "configure"
 struct S { ~S(); };
 void bar();
 void foo()
@@ -20528,6 +20529,14 @@ if test "${libgcj_cv_exidx+set}" = set; then :
 else
   saved_ldflags="$LDFLAGS"
    LDFLAGS="${LDFLAGS} -Wl,--no-merge-exidx-entries"
+   # The IRIX 6 ld doesn't recognize --no-merge-exidx-entries, but only
+   # warns about unknown options, which breaks the testsuite.  So enable
+   # AC_LANG_WERROR, but there's currently (autoconf 2.64) no way to turn
+   # it off again.  As a workaround, save and restore werror flag like
+   # AC_PATH_XTRA.
+   ac_xsave_c_werror_flag=$ac_c_werror_flag
+
+ac_c_werror_flag=yes
    if test x$gcc_no_link = xyes; then
   as_fn_error "Link tests are not allowed after GCC_NO_EXECUTABLES." "$LINENO" 5
 fi
@@ -20542,6 +20551,7 @@ else
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
+   ac_c_werror_flag=$ac_xsave_c_werror_flag
    LDFLAGS="${saved_ldflags}"
 
 fi

libjava/configure.ac

@@ -932,9 +932,17 @@ esac
 AC_CACHE_CHECK([for --no-merge-exidx-entries], [libgcj_cv_exidx],
   [saved_ldflags="$LDFLAGS"
    LDFLAGS="${LDFLAGS} -Wl,--no-merge-exidx-entries"
+   # The IRIX 6 ld doesn't recognize --no-merge-exidx-entries, but only
+   # warns about unknown options, which breaks the testsuite.  So enable
+   # AC_LANG_WERROR, but there's currently (autoconf 2.64) no way to turn
+   # it off again.  As a workaround, save and restore werror flag like
+   # AC_PATH_XTRA.
+   ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag
+   AC_LANG_WERROR
    AC_LINK_IFELSE([int main(void){ return 0;} ],
 		      [eval "libgcj_cv_exidx=yes"],
 		      [eval "libgcj_cv_exidx=no"])
+   ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag
    LDFLAGS="${saved_ldflags}"]
 )
 if test "${libgcj_cv_exidx}" = "yes"; then