| Summary: | [4.2 Regression] link fails with debug and anonymous namespace | ||
|---|---|---|---|
| Product: | gcc | Reporter: | Peter Naulls <peter> |
| Component: | c++ | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | critical | CC: | amodra, fang, gcc-bugs, gcc, geoffk, hubicka, janis, jason, marcus, peter, pinskia |
| Priority: | P1 | Keywords: | link-failure |
| Version: | 4.2.0 | ||
| Target Milestone: | 4.2.0 | ||
| Host: | Target: | ||
| Build: | Known to work: | ||
| Known to fail: | Last reconfirmed: | 2006-10-11 02:48:51 | |
| Bug Depends on: | 27657 | ||
| Bug Blocks: | |||
| Attachments: | minimal test case | ||
Created attachment 12405 [details]
minimal test case
Reducing. Reduced testcase:
template <int>
struct lambda_functor
{
lambda_functor() {}
};
namespace {
lambda_functor<2 > free2;
lambda_functor<3 > free3;
lambda_functor<3 > & _3 = free3;
}
int main (void){}
A regression hunt on powerpc-linux identified the following patch:
http://gcc.gnu.org/viewcvs?view=rev&rev=115086
r115086 | jason | 2006-06-30 01:15:56 +0000 (Fri, 30 Jun 2006)
(In reply to comment #5) > A regression hunt on powerpc-linux identified the following patch: This just confirms the problem here is the same as listed in PR 27657 as that patch cause anonymous namespace to be local linkage. Closing as a dup of PR 27657. *** This bug has been marked as a duplicate of 27657 *** |
This is with: gcc (GCC) 4.2.0 20061007 (experimental) On x86 Debian and under Fedora Core 3. Using the lamba part of the boost library, the following is seen: /tmp/ccNdhcXx.o:(.debug_info+0xec9): undefined reference to `boost::lambda::(anonymous namespace)::free2' /tmp/ccNdhcXx.o:(.debug_info+0xed8): undefined reference to `boost::lambda::(anonymous namespace)::free3' /tmp/ccNdhcXx.o:(.debug_info+0x47f2): undefined reference to `boost::lambda::(anonymous namespace)::free2' /tmp/ccNdhcXx.o:(.debug_info+0x4806): undefined reference to `boost::lambda::(anonymous namespace)::free3' I don't think the fault is in the boost library. Here is the code in question: namespace { // These are constants types and need to be initialised boost::lambda::placeholder1_type free1 = boost::lambda::placeholder1_type(); boost::lambda::placeholder2_type free2 = boost::lambda::placeholder2_type(); boost::lambda::placeholder3_type free3 = boost::lambda::placeholder3_type(); boost::lambda::placeholder1_type& _1 = free1; boost::lambda::placeholder2_type& _2 = free2; boost::lambda::placeholder3_type& _3 = free3; // _1, _2, ... naming scheme by Peter Dimov } // unnamed To trigger the problem requires at least -O and -g2. My C++ isn't good enough to comment further. I attach a minimal preprocessed case. compile with: g++-4.2 test.ii -O -g2 This works correctly on previous GCC versions, and with -g1.