richi's fixes for c++ bootstrap

From-SVN: r160105

1 files changed, 71 insertions, 0 deletions

diff --git a/libcpp/aclocal.m4 b/libcpp/aclocal.m4
index c3a9f03..a92771a 100644
--- a/libcpp/aclocal.m4
+++ b/libcpp/aclocal.m4
@@ -22,3 +22,74 @@ m4_include([../config/lib-link.m4])
 m4_include([../config/lib-prefix.m4])
 m4_include([../config/override.m4])
 m4_include([../config/warnings.m4])
+
+## ---------------------------------------------------------------- ##
+## Checking for declared symbols.                                   ##
+## This is like *AC_CHECK_DECL*, except that for c++, we may use a  ##
+## prototype to check for a (possibly overloaded) function.         ##
+## ---------------------------------------------------------------- ##
+
+
+# _AC_CHECK_PROTO_BODY
+# -------------------
+# Shell function body for AC_CHECK_PROTO.
+m4_define([_AC_CHECK_PROTO_BODY],
+[  AS_LINENO_PUSH([$[]1])
+  [as_decl_name=`echo $][2|sed 's/(.*//'`]
+  [as_decl_use=`echo $][2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`]
+  AC_CACHE_CHECK([whether $as_decl_name is declared], [$[]3],
+  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]4],
+[@%:@ifndef $[]as_decl_name
+@%:@ifdef __cplusplus
+  (void) $[]as_decl_use;
+@%:@else
+  (void) $[]as_decl_name;
+@%:@endif
+@%:@endif
+])],
+		   [AS_VAR_SET([$[]3], [yes])],
+		   [AS_VAR_SET([$[]3], [no])])])
+  AS_LINENO_POP
+])# _AC_CHECK_PROTO_BODY
+
+# AC_CHECK_PROTO(SYMBOL,
+#               [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
+#               [INCLUDES = DEFAULT-INCLUDES])
+# -------------------------------------------------------
+# Check whether SYMBOL (a function, variable, or constant) is declared.
+AC_DEFUN([AC_CHECK_PROTO],
+[AC_REQUIRE_SHELL_FN([ac_fn_]_AC_LANG_ABBREV[_check_proto],
+  [AS_FUNCTION_DESCRIBE([ac_fn_]_AC_LANG_ABBREV[_check_proto],
+    [LINENO SYMBOL VAR],
+    [Tests whether SYMBOL is declared, setting cache variable VAR accordingly.])],
+  [_$0_BODY])]dnl
+[AS_VAR_PUSHDEF([ac_Symbol], [ac_cv_have_decl_$1])]dnl
+[ac_fn_[]_AC_LANG_ABBREV[]_check_proto ]dnl
+["$LINENO" "$1" "ac_Symbol" "AS_ESCAPE([AC_INCLUDES_DEFAULT([$4])], [""])"
+AS_VAR_IF([ac_Symbol], [yes], [$2], [$3])
+AS_VAR_POPDEF([ac_Symbol])dnl
+])# AC_CHECK_PROTO
+
+
+# _AC_CHECK_PROTOS(SYMBOL, ACTION-IF_FOUND, ACTION-IF-NOT-FOUND,
+#                  INCLUDES)
+# -------------------------------------------------------------
+# Helper to AC_CHECK_PROTOS, which generates the check for a single
+# SYMBOL with INCLUDES, performs the AC_DEFINE, then expands
+# ACTION-IF-FOUND or ACTION-IF-NOT-FOUND.
+m4_define([_AC_CHECK_PROTOS],
+[AC_CHECK_PROTO([$1], [ac_have_decl=1], [ac_have_decl=0], [$4])]dnl
+[AC_DEFINE_UNQUOTED(AS_TR_CPP(patsubst(HAVE_DECL_[$1],[(.*])), [$ac_have_decl],
+  [Define to 1 if you have the declaration of `$1',
+   and to 0 if you don't.])]dnl
+[m4_ifvaln([$2$3], [AS_IF([test $ac_have_decl = 1], [$2], [$3])])])
+
+# AC_CHECK_PROTOS(SYMBOLS,
+#                 [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
+#                 [INCLUDES = DEFAULT-INCLUDES])
+# --------------------------------------------------------
+# Defines HAVE_DECL_SYMBOL to 1 if declared, 0 otherwise.  See the
+# documentation for a detailed explanation of this difference with
+# other AC_CHECK_*S macros.  SYMBOLS is an m4 list.
+AC_DEFUN([AC_CHECK_PROTOS],
+[m4_map_args_sep([_$0(], [, [$2], [$3], [$4])], [], $1)])