[Bug lto/45375] [meta-bug] Issues with building Mozilla with LTO

["markus at trippelsdorf dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45375

--- Comment #191 from Markus Trippelsdorf <markus at trippelsdorf dot de> ---
First of all many thanks for your work on reducing memory usage.
Peak memory usage is now lower (~3GB) than clang's (~4GB).

However, with -enable-optimize=-O3 on rev202079 I get:
(An default (-Os) build on rev202053 went fine this morning)

/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: /tmp/ccd3grW1.ltrans0.ltrans.o: requires dynamic R_X86_64_PC32 reloc
against '_ZN17nsHtt
pTransaction18ReadRequestSegmentEP14nsIInputStreamPvPKcjjPj' which may overflow
at runtime; recompile with -fPIC
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: /tmp/ccd3grW1.ltrans0.ltrans.o: requires dynamic R_X86_64_PC32 reloc
against '_ZN17nsHtt
pTransaction18ReadRequestSegmentEP14nsIInputStreamPvPKcjjPj' which may overflow
at runtime; recompile with -fPIC
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: /tmp/ccd3grW1.ltrans1.ltrans.o: requires dynamic R_X86_64_PC32 reloc
against '_ZN16nsInp
utStreamTee15WriteSegmentFunEP14nsIInputStreamPvPKcjjPj' which may overflow at
runtime; recompile with -fPIC
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: /tmp/ccd3grW1.ltrans24.ltrans.o: requires dynamic R_X86_64_PC32 reloc
against '_ZN16nsIn
putStreamTee15WriteSegmentFunEP14nsIInputStreamPvPKcjjPj' which may overflow at
runtime; recompile with -fPIC
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: read-only segment has dynamic relocations
/tmp/ccd3grW1.ltrans0.ltrans.o:ccd3grW1.ltrans0.o:function
nsHttpTransaction::ReadSegments(nsAHttpSegmentReader*, unsigned int, unsigned
int*): error: undefined reference to 
'nsHttpTransaction::ReadRequestSegment(nsIInputStream*, void*, char const*,
unsigned int, unsigned int, unsigned int*)'
/tmp/ccd3grW1.ltrans0.ltrans.o:ccd3grW1.ltrans0.o:function
nsHttpConnection::OnSocketWritable(): error: undefined reference to
'nsHttpTransaction::ReadRequestSegment(nsIInput
Stream*, void*, char const*, unsigned int, unsigned int, unsigned int*)'
/tmp/ccd3grW1.ltrans0.ltrans.o:ccd3grW1.ltrans0.o:function
nsHttpPipeline::ReadSegments(nsAHttpSegmentReader*, unsigned int, unsigned
int*): error: undefined reference to 'ns
HttpPipeline::ReadFromPipe(nsIInputStream*, void*, char const*, unsigned int,
unsigned int, unsigned int*)'
/tmp/ccd3grW1.ltrans1.ltrans.o:ccd3grW1.ltrans1.o:function
imgRequest::OnDataAvailable(nsIRequest*, nsISupports*, nsIInputStream*,
unsigned long, unsigned int): error: undefi
ned reference to 'nsInputStreamTee::WriteSegmentFun(nsIInputStream*, void*,
char const*, unsigned int, unsigned int, unsigned int*)'
/tmp/ccd3grW1.ltrans24.ltrans.o:ccd3grW1.ltrans24.o:function
nsInputStreamTee::ReadSegments(tag_nsresult (*)(nsIInputStream*, void*, char
const*, unsigned int, unsigned int, 
unsigned int*), void*, unsigned int, unsigned int*): error: undefined reference
to 'nsInputStreamTee::WriteSegmentFun(nsIInputStream*, void*, char const*,
unsigned int, unsig
ned int, unsigned int*)'

Not sure if -O3 or rev202079 is to blame.