https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64146
Bug ID: 64146
Summary: [5 Regression] ipa-icf breaks gold dynamic_test_2 test
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: amodra at gmail dot com
gold/testsuite/dynamic_list_lib2.cc contains the following:
extern "C" const char*
foo()
{
return "original";
}
const char*
test_foo()
{
return foo();
}
extern "C" const char*
bar()
{
return "original";
}
const char*
test_bar()
{
return bar();
}
As you can see (and icf sees!) foo and bar are identical, and it seems test_foo
and test_bar are also identical but they are not. Code emitted for foo is "jmp
bar". This is fine. Code emitted for _Z8test_foov is "jmp _Z8test_barv".
This is *not* OK. foo and/or bar may be overridden at runtime when this code
is compiled into a shared library, so the call to bar in test_bar might not go
to the local bar, and similarly for the call to foo in test_foo.
