cxa_demangle check

stepmania/autoconf/m4/backtrace.m4

@@ -33,6 +33,33 @@ AC_DEFUN(SM_FUNC_BACKTRACE_SYMBOLS,
     AC_MSG_RESULT($have_backtrace_symbols)
 ])
 
+AC_DEFUN(SM_FUNC_CXA_DEMANGLE,
+[
+    # Check for abi::__cxa_demangle (gcc 3.1+)
+    AC_MSG_CHECKING(for working cxa_demangle)
+    AC_LANG_PUSH(C++)
+    AC_TRY_RUN(
+    [
+	    #include <cxxabi.h>
+	    #include <stdlib.h>
+	    #include <typeinfo>
+
+	    int main()
+	    {
+		    struct foo { } fum;
+		    int status;
+		    char *realname = abi::__cxa_demangle(typeid(fum).name(), 0, 0, &status);
+		    free( realname );
+		    return 0;
+	    }
+    ], have_cxa_demangle=yes,have_cxa_demangle=no,have_cxa_demangle=no
+    )
+    AC_LANG_POP(C++)
+    AC_MSG_RESULT($have_cxa_demangle)
+    if test "$have_cxa_demangle" = "yes"; then
+	AC_DEFINE(HAVE_CXA_DEMANGLE, 1, [abi::__cxa_demangle available])
+    fi
+])    
 	
 # To support backtraces in the crash handler, we need two things: a call to
 # get backtrace pointers, and a way to convert them to symbols.
@@ -91,18 +118,31 @@ AC_DEFUN(SM_CHECK_CRASH_HANDLER,
 	    # All current symbol lookup methods need this flag.
 	    LDFLAGS="$LDFLAGS -rdynamic"
 
-	    # Check for libiberty.  This makes backtraces much nicer.
+	    SM_FUNC_CXA_DEMANGLE
+	    if test "$have_cxa_demangle" = "yes"; then
+	    	have_demangle=yes
+		AC_DEFINE([BACKTRACE_DEMANGLE_METHOD_TEXT],["cxa_demangle"],[Define demangle type])
+   	    fi 
+    
+	    if test "$have_demangle" != "yes"; then
+		    # Check for libiberty.
 		    AC_CHECK_HEADER(libiberty.h, have_iberty_header=yes, have_iberty_header=no)
 		    AC_SEARCH_LIBS(cplus_demangle, [iberty], have_iberty_lib=yes, have_iberty_lib=no)
 
 		    if test $have_iberty_lib = "yes" -a $have_iberty_header = "yes"; then
 			    AC_DEFINE(HAVE_LIBIBERTY, 1, [Liberty available])
-	    else
+			    have_demangle=yes
+			    AC_DEFINE([BACKTRACE_DEMANGLE_METHOD_TEXT],["libiberty"],[Define demangle type])
+		    fi
+	    fi
+
+	    if test "$have_demangle" != "yes"; then
 		    echo
 		    echo "*** Backtrace support has been detected, but libiberty is not installed."
 		    echo "*** Libiberty will make crash reports for developers much easier to read,"
 		    echo "*** and is strongly recommended."
 		    echo
+		    AC_DEFINE([BACKTRACE_DEMANGLE_METHOD_TEXT],["none"],[Define demangle type])
 	    fi
     fi
 ])