Red Hat Bugzilla – Bug 1261016
When building a cross-gcc, ld SEGV's when creating the ppc32 BE shared libgcc
Last modified: 2016-11-03 21:53:13 EDT
Description of problem: I'm using the sources from the RHEL-7.2 binutils and gcc to build cross-toolchains that can be hosted on non-RHEL-7 platforms to target the RHEL-7.2 environment. The linker, however, SEGVs when building the shared libgcc for ppc32 BE and at least one other time according to the log. Version-Release number of selected component (if applicable): gcc-4.8.5-20150702 binutils-2.23.52.0.1-54 How reproducible: 100% Steps to Reproduce: 1. Unpack the object tarball in /tmp/objects 2. Run: /usr/bin/powerpc64-rhel72-linux-gnu-ld \ --build-id --no-add-needed --eh-frame-hdr --hash-style=gnu -V -shared \ -m elf32ppclinux -o /tmp/libgcc_s.so.1.tmp \ crti.o crtbeginS.o \ -L/tmp/objects \ --soname=libgcc_s.so.1 \ --version-script=libgcc.map \ _muldi3_s.o \ _negdi2_s.o \ _lshrdi3_s.o \ _ashldi3_s.o \ _ashrdi3_s.o \ _cmpdi2_s.o \ _ucmpdi2_s.o \ _clear_cache_s.o \ _trampoline_s.o \ __main_s.o \ _absvsi2_s.o \ _absvdi2_s.o \ _addvsi3_s.o \ _addvdi3_s.o \ _subvsi3_s.o \ _subvdi3_s.o \ _mulvsi3_s.o \ _mulvdi3_s.o \ _negvsi2_s.o \ _negvdi2_s.o \ _ctors_s.o \ _ffssi2_s.o \ _ffsdi2_s.o \ _clz_s.o \ _clzsi2_s.o \ _clzdi2_s.o \ _ctzsi2_s.o \ _ctzdi2_s.o \ _popcount_tab_s.o \ _popcountsi2_s.o \ _popcountdi2_s.o \ _paritysi2_s.o \ _paritydi2_s.o \ _powisf2_s.o \ _powidf2_s.o \ _powixf2_s.o \ _powitf2_s.o \ _mulsc3_s.o \ _muldc3_s.o \ _mulxc3_s.o \ _multc3_s.o \ _divsc3_s.o \ _divdc3_s.o \ _divxc3_s.o \ _divtc3_s.o \ _bswapsi2_s.o \ _bswapdi2_s.o \ _clrsbsi2_s.o \ _clrsbdi2_s.o \ _fixunssfsi_s.o \ _fixunsdfsi_s.o \ _fixunsxfsi_s.o \ _fixsfdi_s.o \ _fixdfdi_s.o \ _fixxfdi_s.o \ _fixtfdi_s.o \ _fixunssfdi_s.o \ _fixunsdfdi_s.o \ _fixunsxfdi_s.o \ _fixunstfdi_s.o \ _floatdisf_s.o \ _floatdidf_s.o \ _floatdixf_s.o \ _floatditf_s.o \ _floatundisf_s.o \ _floatundidf_s.o \ _floatundixf_s.o \ _floatunditf_s.o \ _divdi3_s.o \ _moddi3_s.o \ _udivdi3_s.o \ _umoddi3_s.o \ _udiv_w_sdiv_s.o \ _udivmoddi4_s.o \ ibm-ldouble_s.o \ tramp_s.o \ ppc64-fp_s.o \ addsf3_s.o \ divsf3_s.o \ eqsf2_s.o \ gesf2_s.o \ lesf2_s.o \ mulsf3_s.o \ negsf2_s.o \ subsf3_s.o \ unordsf2_s.o \ fixsfsi_s.o \ floatsisf_s.o \ floatunsisf_s.o \ adddf3_s.o \ divdf3_s.o \ eqdf2_s.o \ gedf2_s.o \ ledf2_s.o \ muldf3_s.o \ negdf2_s.o \ subdf3_s.o \ unorddf2_s.o \ fixdfsi_s.o \ floatsidf_s.o \ floatunsidf_s.o \ extendsfdf2_s.o \ truncdfsf2_s.o \ enable-execute-stack_s.o \ unwind-dw2_s.o \ unwind-dw2-fde-dip_s.o \ unwind-sjlj_s.o \ unwind-c_s.o \ emutls_s.o \ libgcc.a \ ./libc-2.17.so \ crtendS.o \ crtn.o Actual results: Expected results: Additional info:
Created attachment 1071335 [details] Objects to install in /tmp/objects/ for failing command to process
Here's a backtrace: Program received signal SIGSEGV, Segmentation fault. 0x000000000048c074 in ppc_elf_reloc_type_class (info=0xc89c60, rel_sec=0x7ce1d8, rela=0x80000000) at ../../binutils-2.23.52.0.1/bfd/elf32-ppc.c:9356 9356 struct ppc_elf_link_hash_table *htab = ppc_elf_hash_table (info); Missing separate debuginfos, use: debuginfo-install zlib-1.2.8-7.fc21.x86_64 (gdb) bt #0 0x000000000048c074 in ppc_elf_reloc_type_class (info=0xc89c60, rel_sec=0x7ce1d8, rela=0x80000000) at ../../binutils-2.23.52.0.1/bfd/elf32-ppc.c:9356 #1 0x00000000004849ea in elf_link_sort_relocs (psec=<synthetic pointer>, info=0x78ad00 <link_info>, abfd=0x7ac5c0) at ../../binutils-2.23.52.0.1/bfd/elflink.c:8502 #2 bfd_elf_final_link (abfd=0x7ac5c0, info=0x78ad00 <link_info>) at ../../binutils-2.23.52.0.1/bfd/elflink.c:11394 #3 0x000000000041952e in ldwrite () at ../../binutils-2.23.52.0.1/ld/ldwrite.c:582 #4 0x00000000004037f5 in main (argc=129, argv=0x7fffffffdda8) at ../../binutils-2.23.52.0.1/ld/ldmain.c:400
Created attachment 1071358 [details] Specfile for building RHEL-7.2 cross compilers Here's the specfile for building the RHEL-7.2 cross binutils. Just add the sources from the regular RHEL-7.2 binutils package. If only the x86_64 and s390x cross-compilers aren't required, near the top of the specfile find this bit: %define build_rhel 1 %define build_powerpc64 %{build_rhel} %define build_powerpc64le %{build_rhel} %define build_s390x %{build_rhel} %define build_x86_64 %{build_rhel} Change build_rhel to 0 and build_powerpc64 to 1. Don't bother with build_powerpc64le as it's redundant.
Created attachment 1071386 [details] Altered version of bfd-ppc64le.patch
Created attachment 1071387 [details] Updated spec file
Hi David, The problem is the bfd-ppc64le.patch file. I tries to make powerpc64 specific changes to generic parts of the linker, but it was guarding these changes with a check for #ifdef __PPC__. Unfortunately that symbol is only defined if the *host* compiler is a ppc64 compiler, ie only when building a native ppc64 linker. If you are building a cross hosted ppc64 linker then __PPC__ is not defined, and the patches in bfd-ppc64le.patch do not work. I have uploaded a new patch file pfd-ppc64le.2.patch and a new spec file which includes it. You will note that I have left the old bfd-ppc64le.patch file in the spec file. This is just laziness on my part. It was simpler to do this than to remove the bfd-pp64le.patch and create a new, replacement patch instead. Please try out the new patch and let me know how you get on. Also please let me know if you would prefer it if I created a replacement patch for bfd-ppc64le.patch, rather than a supplemental patch. Cheers Nick
Okay, I can build a ppc32 libgcc okay, but the ppc64 BE shared libgcc now fails with the linker SEGV'ing when called from collect2. Using the following command upon a set of objects extracted into a directory from an archive I'll upload shortly: /usr/bin/powerpc64-rhel72-linux-gnu-ld \ --build-id --no-add-needed --eh-frame-hdr --hash-style=gnu \ -V -shared \ -m elf64ppc \ -o ./libgcc_s.so.1.tmp \ crti.o \ crtbeginS.o \ -L. \ --soname=libgcc_s.so.1 \ --version-script=libgcc.map \ _muldi3_s.o \ _negdi2_s.o \ _lshrdi3_s.o \ _ashldi3_s.o \ _ashrdi3_s.o \ _cmpdi2_s.o \ _ucmpdi2_s.o \ _clear_cache_s.o \ _trampoline_s.o \ __main_s.o \ _absvsi2_s.o \ _absvdi2_s.o \ _addvsi3_s.o \ _addvdi3_s.o \ _subvsi3_s.o \ _subvdi3_s.o \ _mulvsi3_s.o \ _mulvdi3_s.o \ _negvsi2_s.o \ _negvdi2_s.o \ _ctors_s.o \ _ffssi2_s.o \ _ffsdi2_s.o \ _clz_s.o \ _clzsi2_s.o \ _clzdi2_s.o \ _ctzsi2_s.o \ _ctzdi2_s.o \ _popcount_tab_s.o \ _popcountsi2_s.o \ _popcountdi2_s.o \ _paritysi2_s.o \ _paritydi2_s.o \ _powisf2_s.o \ _powidf2_s.o \ _powixf2_s.o \ _powitf2_s.o \ _mulsc3_s.o \ _muldc3_s.o \ _mulxc3_s.o \ _multc3_s.o \ _divsc3_s.o \ _divdc3_s.o \ _divxc3_s.o \ _divtc3_s.o \ _bswapsi2_s.o \ _bswapdi2_s.o \ _clrsbsi2_s.o \ _clrsbdi2_s.o \ _fixunssfsi_s.o \ _fixunsdfsi_s.o \ _fixunsxfsi_s.o \ _fixsfdi_s.o \ _fixdfdi_s.o \ _fixxfdi_s.o \ _fixtfdi_s.o \ _fixunssfdi_s.o \ _fixunsdfdi_s.o \ _fixunsxfdi_s.o \ _fixunstfdi_s.o \ _floatdisf_s.o \ _floatdidf_s.o \ _floatdixf_s.o \ _floatditf_s.o \ _floatundisf_s.o \ _floatundidf_s.o \ _floatundixf_s.o \ _floatunditf_s.o \ _divdi3_s.o \ _moddi3_s.o \ _udivdi3_s.o \ _umoddi3_s.o \ _udiv_w_sdiv_s.o \ _udivmoddi4_s.o \ ibm-ldouble_s.o \ tramp_s.o \ ppc64-fp_s.o \ addsf3_s.o \ divsf3_s.o \ eqsf2_s.o \ gesf2_s.o \ lesf2_s.o \ mulsf3_s.o \ negsf2_s.o \ subsf3_s.o \ unordsf2_s.o \ fixsfsi_s.o \ floatsisf_s.o \ floatunsisf_s.o \ adddf3_s.o \ divdf3_s.o \ eqdf2_s.o \ gedf2_s.o \ ledf2_s.o \ muldf3_s.o \ negdf2_s.o \ subdf3_s.o \ unorddf2_s.o \ fixdfsi_s.o \ floatsidf_s.o \ floatunsidf_s.o \ extendsfdf2_s.o \ truncdfsf2_s.o \ enable-execute-stack_s.o \ unwind-dw2_s.o \ unwind-dw2-fde-dip_s.o \ unwind-sjlj_s.o \ unwind-c_s.o \ emutls_s.o \ libgcc.a \ ./libc-2.17.so \ crtendS.o \ crtn.o
Created attachment 1071813 [details] Objects to install in /tmp/objects2/ for failing ppc64 BE command to process
I applied the patch to the binutils src that is part of the RHEL7.2 beta build. The result was the same, ld core dumps sigsegv when trying to link libgcc... I am trying to create a cross toolchain on RHEL6.3 x86_64 targeted at powerpc64le
Created attachment 1072058 [details] Revised additional patch *sigh* I forgot to check the 64-bit ppc case. Sorry about that. I have uploaded a revised version of the new patch which should make both 32-bit and 64-bit ppc work. Cheers Nick
I can build the compiler now, thanks!
After applying this latest patch, I am now able to build the compiler for the ppc64le-redhat-linux target. Thank you.
The new 7.3 binutils should avoid the need for the patches uploaded here and instead just work. Changing to MODIFIED so that QE can test/verify.
Verified for build binutils-2.25.1-20.base.el7.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-2265.html