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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/51832] [4.7 regression] Rev.182970 causes LTO link errors (multiple definitions of allocator_traits)
Date: Mon, 16 Jan 2012 10:58:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51832

--- Comment #10 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-16 10:53:48 UTC ---
I can't reproduce it with the reduced testcase but _can_ reproduce it with
test.ii test2.ii from the attachment.

trunk-g/gcc> ./g++ -B. /tmp/test.ii /tmp/test2.ii -std=gnu++0x -B
../x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/ -flto 
/tmp/ccaH7unB.o (symbol from plugin): In function
`_ZNSt16allocator_traitsISaIP10ElfSegmentEE18__construct_helperIS1_JRKS1_EE5valueE':
(.text+0x0): multiple definition of
`_ZNSt16allocator_traitsISaIP10ElfSegmentEE18__construct_helperIS1_JRKS1_EE5valueE'
/tmp/ccsJ08q0.o (symbol from plugin):(.text+0x0): first defined here
/usr/lib/../lib64/crt1.o: In function `_start':
/usr/src/packages/BUILD/glibc-2.9/csu/../sysdeps/x86_64/elf/start.S:109:
undefined reference to `main'
collect2: error: ld returned 1 exit status


trunk-g/gcc> ./g++ -B. /tmp/test.ii /tmp/test2.ii -std=gnu++0x -B
../x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/ 
/usr/lib/../lib64/crt1.o: In function `_start':
/usr/src/packages/BUILD/glibc-2.9/csu/../sysdeps/x86_64/elf/start.S:109:
undefined reference to `main'
collect2: error: ld returned 1 exit status


It does not reproduce when not using the linker plugin though and I am
using a linker that uses the v2 interface with the fancy COMDAT support
(the 2.22 release).