Re: [Libunwind-devel] LTO and dwarf_to_unw_regnum_map

[Dilyan Palauzov]

Hello Arun,

./configure --enable-coredump --enable-cxx-exceptions 
--enable-debug-frame --enable-block-signals --enable-msabi-support 
--enable-minidebuginfo --enable-ptrace --enable-setjmp

=> CONFIG_MSABI_SUPPORT is defined.

The output of './configure --help' makes it in no way clear, that 
--enable-msabi-support will break the linking.

Without --enable-msabi-support, linkage fails with:

Making all in src
make[1]: Entering directory '/git/libunwind/src'
make  all-am
make[2]: Entering directory '/git/libunwind/src'
/bin/sh ../libtool --tag=CC --mode=link gcc -pipe -O3 
-fno-fat-lto-objects -flto -fexceptions -Wall -Wsign-compare -XCClinker 
-nostartfiles -XCClinker -nostdlib -version-info 8:1:0		 -Wl,-O1 
-Wl,-z,relro -Wl,-s -o libunwind.la -rpath /usr/lib os-linux.lo 
mi/init.lo mi/flush_cache.lo mi/mempool.lo mi/strerror.lo 
x86_64/is_fpreg.lo x86_64/regname.lo x86_64/Los-linux.lo mi/_ReadULEB.lo 
mi/_ReadSLEB.lo mi/backtrace.lo mi/dyn-cancel.lo mi/dyn-info-list.lo 
mi/dyn-register.lo mi/Ldyn-extract.lo mi/Lfind_dynamic_proc_info.lo 
mi/Lget_accessors.lo mi/Lget_proc_info_by_ip.lo mi/Lget_proc_name.lo 
mi/Lput_dynamic_unwind_info.lo mi/Ldestroy_addr_space.lo mi/Lget_reg.lo 
mi/Lset_reg.lo mi/Lget_fpreg.lo mi/Lset_fpreg.lo 
mi/Lset_caching_policy.lo unwind/Backtrace.lo unwind/DeleteException.lo 
unwind/FindEnclosingFunction.lo unwind/ForcedUnwind.lo unwind/GetBSP.lo 
unwind/GetCFA.lo unwind/GetDataRelBase.lo unwind/GetGR.lo 
unwind/GetIP.lo unwind/GetLanguageSpecificData.lo 
unwind/GetRegionStart.lo unwind/GetTextRelBase.lo 
unwind/RaiseException.lo unwind/Resume.lo unwind/Resume_or_Rethrow.lo 
unwind/SetGR.lo unwind/SetIP.lo unwind/GetIPInfo.lo x86_64/setcontext.lo 
x86_64/Lcreate_addr_space.lo x86_64/Lget_save_loc.lo x86_64/Lglobal.lo 
x86_64/Linit.lo x86_64/Linit_local.lo x86_64/Linit_remote.lo 
x86_64/Lget_proc_info.lo x86_64/Lregs.lo x86_64/Lresume.lo 
x86_64/Lstash_frame.lo x86_64/Lstep.lo x86_64/Ltrace.lo 
x86_64/getcontext.lo libunwind-dwarf-local.la libunwind-elf64.la -lc 
-lgcc_s -llzma
libtool: link: gcc -shared -fPIC -DPIC .libs/os-linux.o mi/.libs/init.o 
mi/.libs/flush_cache.o mi/.libs/mempool.o mi/.libs/strerror.o 
x86_64/.libs/is_fpreg.o x86_64/.libs/regname.o x86_64/.libs/Los-linux.o 
mi/.libs/_ReadULEB.o mi/.libs/_ReadSLEB.o mi/.libs/backtrace.o 
mi/.libs/dyn-cancel.o mi/.libs/dyn-info-list.o mi/.libs/dyn-register.o 
mi/.libs/Ldyn-extract.o mi/.libs/Lfind_dynamic_proc_info.o 
mi/.libs/Lget_accessors.o mi/.libs/Lget_proc_info_by_ip.o 
mi/.libs/Lget_proc_name.o mi/.libs/Lput_dynamic_unwind_info.o 
mi/.libs/Ldestroy_addr_space.o mi/.libs/Lget_reg.o mi/.libs/Lset_reg.o 
mi/.libs/Lget_fpreg.o mi/.libs/Lset_fpreg.o 
mi/.libs/Lset_caching_policy.o unwind/.libs/Backtrace.o 
unwind/.libs/DeleteException.o unwind/.libs/FindEnclosingFunction.o 
unwind/.libs/ForcedUnwind.o unwind/.libs/GetBSP.o unwind/.libs/GetCFA.o 
unwind/.libs/GetDataRelBase.o unwind/.libs/GetGR.o unwind/.libs/GetIP.o 
unwind/.libs/GetLanguageSpecificData.o unwind/.libs/GetRegionStart.o 
unwind/.libs/GetTextRelBase.o unwind/.libs/RaiseException.o 
unwind/.libs/Resume.o unwind/.libs/Resume_or_Rethrow.o 
unwind/.libs/SetGR.o unwind/.libs/SetIP.o unwind/.libs/GetIPInfo.o 
x86_64/.libs/setcontext.o x86_64/.libs/Lcreate_addr_space.o 
x86_64/.libs/Lget_save_loc.o x86_64/.libs/Lglobal.o x86_64/.libs/Linit.o 
x86_64/.libs/Linit_local.o x86_64/.libs/Linit_remote.o 
x86_64/.libs/Lget_proc_info.o x86_64/.libs/Lregs.o 
x86_64/.libs/Lresume.o x86_64/.libs/Lstash_frame.o x86_64/.libs/Lstep.o 
x86_64/.libs/Ltrace.o x86_64/.libs/getcontext.o -Wl,--whole-archive 
./.libs/libunwind-dwarf-local.a ./.libs/libunwind-elf64.a 
-Wl,--no-whole-archive  -lc -lgcc_s /usr/lib/liblzma.so -O3 -flto 
-nostartfiles -nostdlib -Wl,-O1 -Wl,-z -Wl,relro -Wl,-s -pthread 
-Wl,-soname -Wl,libunwind.so.8 -o .libs/libunwind.so.8.0.1
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.3/../../../../x86_64-unknown-linux-gnu/bin/ld: 
/tmp/cccxfTD7.ltrans0.ltrans.o: relocation R_X86_64_PC32 against 
protected symbol `_ULx86_64_local_addr_space' can not be used when 
making a shared object
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.3/../../../../x86_64-unknown-linux-gnu/bin/ld: 
final link failed: Bad value
collect2: error: ld returned 1 exit status
Makefile:2582: recipe for target 'libunwind.la' failed
make[2]: *** [libunwind.la] Error 1
make[2]: Leaving directory '/git/libunwind/src'
Makefile:1646: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/git/libunwind/src'
Makefile:594: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1

Any ideas?

Greetings
  Dilian

On 07/06/2015 08:43 PM, Arun Sharma wrote:
> On Mon, Jul 6, 2015 at 11:14 AM, Dilyan Palauzov
> <address@hidden> wrote:
> > Hello,
> >
> > when consulting the output from the preprocessor, in
> > dwarf/Lfind_proc_info-lsb.i I have extern const uint8_t
> > _ULx86_64_dwarf_to_unw_regnum_map[17], and in x86_64/Lglobal.i is is
> > extern const uint8_t _ULx86_64_dwarf_to_unw_regnum_map[33]; .
> >
> > 33 != 17
>
> Do you have CONFIG_MSABI_SUPPORT=yes by any chance? Should be disabled
> by default.
>
>   -Arun