http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50888
Bug #: 50888
Summary: Bootstrap failure in libjava against latest git glibc
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: ja...@gcc.gnu.org
CC: a...@gcc.gnu.org, m...@gcc.gnu.org, tro...@gcc.gnu.org
./.libs/libgcj.so: undefined reference to `__cxa_call_unexpected'
collect2: ld returned 1 exit status
make[3]: *** [jv-convert] Error 1
make[3]: *** Waiting for unfinished jobs....
./.libs/libgcj.so: undefined reference to `__cxa_call_unexpected'
collect2: ld returned 1 exit status
make[3]: *** [gcj-dbtool] Error 1
The problem is that libgcj is compiled with C++ and -fnon-call-exceptions, but
doesn't link against -lstdc++ nor -lsupc++. <ctype.h> in glibc recently
changed, so that isspace in C++ is now an inline function:
# define __isctype_f(type) \
__extern_inline int \
is##type (int __c) __THROW \
{ \
return (*__ctype_b_loc ())[(int) (__c)] & (unsigned short int) _IS##type; \
}
...
__isctype_f (space)
While __ctype_b_loc, a function pointer, has throw () on it, the isspace inline
has it too. So normally not a problem. But with -fnon-call-exceptions we end
up with __cxa_call_unexpected call just in case __ctype_b_loc fn pointer would
be invalid (it is not, but gcc doesn't know it).
2011-10-27 Jakub Jelinek <ja...@redhat.com>
* prims.cc (__NO_CTYPE): For glibc define this before including
ctype.h.
--- libjava/prims.cc 2009-04-28 06:02:30.000000000 +0200
+++ libjava/prims.cc 2011-10-27 12:57:42.748752380 +0200
@@ -38,6 +38,14 @@ details. */
#endif
#ifndef DISABLE_GETENV_PROPERTIES
+#ifdef __GLIBC__
+/* glibc 2.15+ provides even for C++ inline optimized ::isspace etc.
+ Unfortunately those inlines are throw (), and call a function pointer
+ (which is throw () too, but with -fnon-call-exceptions this results
+ in a __cxa_call_unexpected call. This macro disables the optimized
+ version. */
+#define __NO_CTYPE 1
+#endif
#include <ctype.h>
#include <java-props.h>
#define PROCESS_GCJ_PROPERTIES process_gcj_properties()
works for me but might be considered too hackish (__NO_CTYPE results in macro
says to <ctype.h> it should optimize isspace etc.).
Other alternatives would be to link -lsupc++ in, or replace use of isspace (c)
with memchr (" \t\n\r\v", c, 5) != NULL (the standard POSIX "C" locale isspace
characters), or use safe-ctype, etc.
