https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70305
Bug ID: 70305
Summary: 5.3.0 solaris: ld: fatal: relocation error:
R_SPARC_DISP32: file
../src/c++11/.libs/libc++11convenience.a
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: andrew at ishiboo dot com
Target Milestone: ---
In 5.3.0 release on Solaris, the libstdc++, libitm, and libgfortran libraries
all fail to link with hundreds of errors such as:
ld: fatal: relocation error: R_SPARC_DISP32: file
../src/c++11/.libs/libc++11convenience.a(wlocale-inst.o): section
[1504].rela.eh_frame: symbol
.text._ZNKSt19istreambuf_iteratorIwSt11char_traitsIwEE5equalERKS2_%std::istreambuf_iterator<wchar_t,
std::char_traits<wchar_t> >::equal(std::istreambuf_iterator<wchar_t,
std::char_traits<wchar_t> > const&) const (section): symbol has been discarded
with discarded section:
[716].text._ZNKSt19istreambuf_iteratorIwSt11char_traitsIwEE5equalERKS2_%std::istreambuf_iterator<wchar_t,
std::char_traits<wchar_t> >::equal(std::istreambuf_iterator<wchar_t,
std::char_traits<wchar_t> > const&) const
or
ld: fatal: relocation error: R_SPARC_UA32: file
../src/c++11/.libs/libc++11convenience.a(wlocale-inst.o): section [1509].rel
a.debug_line: symbol
.text._ZNKSt19istreambuf_iteratorIwSt11char_traitsIwEE5equalERKS2_%std::istreambuf_iterator<wchar_t,
st
d::char_traits<wchar_t> >::equal(std::istreambuf_iterator<wchar_t,
std::char_traits<wchar_t> > const&) const (section): symb
ol has been discarded with discarded section:
[716].text._ZNKSt19istreambuf_iteratorIwSt11char_traitsIwEE5equalERKS2_%std::i
streambuf_iterator<wchar_t, std::char_traits<wchar_t>
>::equal(std::istreambuf_iterator<wchar_t, std::char_traits<wchar_t> >
const&) const
The Solaris 11 linker by default now is very strict about COMDAT relocation
processing. A new linker flag has been added `-z relax=comdat` that relaxes
COMDAT rules and enables sloppy relocation processing. In order to get a
working 5.3.0 build, it is necessary to patch configure (since libtool is not
patched) to add the `-z relax=comdat` linker flag in all cases where GCC is
used with the Solaris linker.
I opened this here because patching libtool to add this flag seems incorrect.
The built xg++ compiler should not be generating code that causes the (now)
more strict linker to fail.
$ ld -V
ld: Software Generation Utilities - Solaris Link Editors: 5.11-1.2329
$ as -V
as: Sun Compiler Common 12 SunOS_sparc s11_2sru04_1 09/30/2014
$ uname -a
SunOS xxx 5.11 11.2 sun4v sparc sun4v Solaris
From the man page:
-z relax=item1,item2,...
The link-editor performs validity checks in order to
ensure that the resulting output object is valid and
usable at runtime. In addition, the link-editor can
transition a variety of relocations to generate more
optimal instruction sequences. The -z relax option can
be used to relax validity checking and relocation tran-
sitions in order to produce an output object that would
otherwise be rejected.
comdat
The link-editor normally issues a fatal error upon
encountering a relocation using a symbol that refer-
ences an eliminated COMDAT section. If -z
relax=comdat is enabled, the link-editor instead
redirects such relocations to the equivalent symbol
in the COMDAT section that was kept.
