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Compiling Samba with LTO
- From: Ralph Boehme <slow at samba dot org>
- To: gcc-help at gcc dot gnu dot org
- Date: Fri, 11 Mar 2016 16:27:25 +0100
- Subject: Compiling Samba with LTO
- Authentication-results: sourceware.org; auth=none
Hi all!
I'm seeing a problem when building Samba with LTO. Linking fails
reproducibly at this stage:
[4086/4247] Linking default/source4/torture/smbtorture
13:31:06 runner /usr/bin/gcc
default/source4/lib/registry/tests/generic_20.o ...
... many many object files and libraries ...
/tmp/cc9skRWL.ltrans3.ltrans.o: In function `smbsrv_accept.lto_priv.11':
<artificial>:(.text+0x4cd6): undefined reference to `timeval_current.lto_priv.641'
/tmp/cc9skRWL.ltrans4.ltrans.o: In function `smbsrv_recv_smb2_request':
<artificial>:(.text+0xf661): undefined reference to `timeval_current.lto_priv.641'
... many more undefined references to timeval_* ...
Full build log:
<https://www.samba.org/~slow/files/log.gz>
$ gcc --version
gcc (GCC) 5.3.1 20151207 (Red Hat 5.3.1-2)
The buildsystem correctly passes -flto when compiling .c files and the
link steps has it as well.
The missing symbols are in libsamba-util which is among the linked
libraries:
$ nm bin/shared/libsamba-util.so.0 | egrep
'timeval_current$|timeval_elapsed$'
000000000001cd6b T timeval_current
000000000001a206 T timeval_elapsed
The build works just fine without -flto.
I'd appreciate any pointers on how to get -flto going.
Thanks!
-slow