http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53282
Bug #: 53282
Summary: lto and visibility-inlines-hidden makes "wrongly"
hidden symbols and in a way that depends on the order
of the input compilation units
Classification: Unclassified
Product: gcc
Version: 4.7.1
Status: UNCONFIRMED
Severity: blocker
Priority: P3
Component: lto
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: vincenzo.innoce...@cern.ch
Target: x86_64-unknown-linux-gnu
Build: gcc-4_7-branch revision 187276
Created attachment 27345
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27345
directory containing three (very similar) real-life file after pre-compiler
step
in the following example (not much reduced from a real-life code)
a symbol, very similar to others, is made hidden for no good reason.
Apparently it also depends on the order of the input files…
bzip2 -d ltobug3.tar.bz2
tar -xf ltobug3.tar
cd ltobug3/
c++ -fvisibility-inlines-hidden -O2 -flto -shared -fPIC -o bha.so d1.cc d2.cc
d3.cc ; nm -C bha.so | grep "makeKey" | grep -v "type"
0000000000004290 t
_ZN3edm10eventsetup15heterocontainer7makeKeyI11DummyRecordNS0_19EventSetupRecordKeyEEET0_v.local.77.4195
0000000000004750 W edm::eventsetup::EventSetupRecordKey
edm::eventsetup::heterocontainer::makeKey<Dummy2Record,
edm::eventsetup::EventSetupRecordKey>()
00000000000048a0 W edm::eventsetup::EventSetupRecordKey
edm::eventsetup::heterocontainer::makeKey<DepRecord,
edm::eventsetup::EventSetupRecordKey>()
c++ -fvisibility-inlines-hidden -O2 -flto -shared -fPIC -o bha.so d2.cc d1.cc
d3.cc ; nm -C bha.so | grep "makeKey" | grep -v "type"
00000000000048a0 W edm::eventsetup::EventSetupRecordKey
edm::eventsetup::heterocontainer::makeKey<DummyRecord,
edm::eventsetup::EventSetupRecordKey>()
0000000000004750 W edm::eventsetup::EventSetupRecordKey
edm::eventsetup::heterocontainer::makeKey<Dummy2Record,
edm::eventsetup::EventSetupRecordKey>()
00000000000049f0 W edm::eventsetup::EventSetupRecordKey
edm::eventsetup::heterocontainer::makeKey<DepRecord,
edm::eventsetup::EventSetupRecordKey>()
