Bug 40923

Summary:	bootstrap failure for 20090730 with --enable-build-with-cxx
Product:	gcc	Reporter:	David Binderman <dcb314>
Component:	bootstrap	Assignee:	Not yet assigned to anyone <unassigned>
Status:	RESOLVED FIXED
Severity:	normal	CC:	bkoz, gcc-bugs, ian, jason
Priority:	P3
Version:	4.5.0
Target Milestone:	---
Host:	x86_64-suse-linux	Target:
Build:		Known to work:
Known to fail:		Last reconfirmed:	2009-10-24 04:04:57
Attachments:	Candidate patch

Description David Binderman 2009-07-31 09:08:07 UTC

I just tried to bootstrap gcc 4.5 mainline snapshot 20090730
and it failed when comparing stage 2 and stage3.

There is the output

Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/vec.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/eh_globals.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/eh_alloc.o differs
x86_64-unknown-linux-gnu/libstdc++-v3/src/locale.o differs

configure line was

../src/gcc-4.5-20090730/configure --enable-languages=c,c++ --prefix=/home/dcb/gcc/20090730/results --enable-checking --enable-build-with-cxx

The previous snapshot 20090723 also failed to bootstrap
but the one before that 20090716 bootstrapped fine.

I suspect a code change somewhere between 20090716 and 20090723.

Comment 1 David Binderman 2009-07-31 11:40:59 UTC

(In reply to comment #0)
> I just tried to bootstrap gcc 4.5 mainline snapshot 20090730
> and it failed when comparing stage 2 and stage3.

The extra word --enable-build-with-cxx seems to be significant,
because when I remove it, the compiler bootstraps fine.

Comment 2 Dmitry Gorbachev 2009-08-07 19:25:49 UTC

Keywords: mangling, anonymous namespaces.

Adding option such as -frandom-seed=271828 to CXXFLAGS_FOR_TARGET allows to bootstrap.

Comment 3 Jerry Quinn 2009-10-24 04:06:40 UTC

Created attachment 18885 [details]
Candidate patch

This fixes the bootstrap, though a bunch of plugin tests fail compared to unpatched build with C.

Comment 4 Jerry Quinn 2009-10-30 05:58:03 UTC

Should be fixed by r153734.