4 files changed, 36 insertions, 39 deletions
diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index 233b175..9a80ed4 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,9 @@
+2007-06-14  Paolo Bonzini  <bonzini@gnu.org>
+
+	* aclocal.m4: Include config/warnings.m4.
+	* configure.ac: Use ACX_PROG_CC_WARNING_OPTS.
+	* configure: Regenerate.
+
 2007-06-07  Geoffrey Keating  <geoffk@apple.com>
 
 	* configure.ac: Non-default multilibs can be cross compilations.
diff --git a/libiberty/aclocal.m4 b/libiberty/aclocal.m4
index 0b49d03..643939e 100644
--- a/libiberty/aclocal.m4
+++ b/libiberty/aclocal.m4
@@ -1,5 +1,6 @@
 sinclude(../config/acx.m4)
 sinclude(../config/no-executables.m4)
+sinclude(../config/warnings.m4)
 
 dnl See whether strncmp reads past the end of its string parameters.
 dnl On some versions of SunOS4 at least, strncmp reads a word at a time
diff --git a/libiberty/configure b/libiberty/configure
index c745d8b..d350af7 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -2953,22 +2953,33 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 ac_c_preproc_warn_flag=yes
 
-# Warn C++ incompatibilities if supported.
 
-echo "$as_me:$LINENO: checking whether ${CC} accepts -Wc++-compat" >&5
-echo $ECHO_N "checking whether ${CC} accepts -Wc++-compat... $ECHO_C" >&6
-if test "${ac_cv_prog_cc_w_cxx_compat+set}" = set; then
+ac_libiberty_warn_cflags=
+save_CFLAGS="$CFLAGS"
+for option in -W -Wall -pedantic -Wwrite-strings -Wc++-compat \
+			  -Wstrict-prototypes; do
+  as_acx_Woption=`echo "acx_cv_prog_cc_warning_$option" | $as_tr_sh`
+
+  echo "$as_me:$LINENO: checking whether $CC supports $option" >&5
+echo $ECHO_N "checking whether $CC supports $option... $ECHO_C" >&6
+if eval "test \"\${$as_acx_Woption+set}\" = set"; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
-  save_CFLAGS="$CFLAGS"
-  CFLAGS="-Wc++-compat"
-  cat >conftest.$ac_ext <<_ACEOF
+  CFLAGS="$option"
+    cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
 cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
 
+int
+main ()
+{
+
+  ;
+  return 0;
+}
 _ACEOF
 rm -f conftest.$ac_objext
 if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
@@ -2992,28 +3003,25 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_status=$?
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; }; then
-  ac_cv_prog_cc_w_cxx_compat=yes
+  eval "$as_acx_Woption=yes"
 else
   echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
 
-ac_cv_prog_cc_w_cxx_compat=no
+eval "$as_acx_Woption=no"
 fi
 rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
-  CFLAGS="$save_CFLAGS"
 
 fi
-echo "$as_me:$LINENO: result: $ac_cv_prog_cc_w_cxx_compat" >&5
-echo "${ECHO_T}$ac_cv_prog_cc_w_cxx_compat" >&6
-
-
-if test x$GCC = xyes; then
-  ac_libiberty_warn_cflags='-W -Wall -pedantic -Wwrite-strings -Wstrict-prototypes'
-fi
-if test $ac_cv_prog_cc_w_cxx_compat = yes ; then
-  ac_libiberty_warn_cflags="${ac_libiberty_warn_cflags} -Wc++-compat"
+echo "$as_me:$LINENO: result: `eval echo '${'$as_acx_Woption'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_acx_Woption'}'`" >&6
+  if test `eval echo '${'$as_acx_Woption'}'` = yes; then
+  ac_libiberty_warn_cflags="$ac_libiberty_warn_cflags${ac_libiberty_warn_cflags:+ }$option"
 fi
 
+  done
+CFLAGS="$save_CFLAGS"
+
 
 if test "x$CC" != xcc; then
   echo "$as_me:$LINENO: checking whether $CC and cc understand -c and -o together" >&5
diff --git a/libiberty/configure.ac b/libiberty/configure.ac
index cdc3cd3..8212378 100644
--- a/libiberty/configure.ac
+++ b/libiberty/configure.ac
@@ -132,26 +132,8 @@ GCC_NO_EXECUTABLES
 AC_PROG_CC
 AC_PROG_CPP_WERROR
 
-# Warn C++ incompatibilities if supported.
-AC_CACHE_CHECK(
-  [whether ${CC} accepts -Wc++-compat],
-  [ac_cv_prog_cc_w_cxx_compat],
-  [save_CFLAGS="$CFLAGS"
-  CFLAGS="-Wc++-compat"
-  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[]])],
-                    [ac_cv_prog_cc_w_cxx_compat=yes],
-                    [ac_cv_prog_cc_w_cxx_compat=no])
-  CFLAGS="$save_CFLAGS"
-  ])
-
-
-if test x$GCC = xyes; then
-  ac_libiberty_warn_cflags='-W -Wall -pedantic -Wwrite-strings -Wstrict-prototypes'
-fi
-if test $ac_cv_prog_cc_w_cxx_compat = yes ; then
-  ac_libiberty_warn_cflags="${ac_libiberty_warn_cflags} -Wc++-compat"
-fi
-AC_SUBST(ac_libiberty_warn_cflags)
+ACX_PROG_CC_WARNING_OPTS([-W -Wall -pedantic -Wwrite-strings -Wc++-compat \
+			  -Wstrict-prototypes], [ac_libiberty_warn_cflags])
 
 AC_PROG_CC_C_O
 # autoconf is lame and doesn't give us any substitution variable for this.