[Mesa-dev] mesa-10.4.4: BROKEN TLS support in GLX with llvm-toolchain v3.6.0rc2

Mon Feb 9 12:51:23 PST 2015

On 09/02/15 17:44, Emil Velikov wrote:
> Hi Sedat,
>
> On 07/02/15 22:42, Sedat Dilek wrote:
>> [ Please CC me I am not subscribed to mesa-dev and llvmdev MLs ]
>>
>> Hi,
>>
>> I already reported this when playing 1st time with my llvm-toolchain
>> v3.6.0rc2 and mesa v10.3.7 [1].
>> The issue still remains in mesa v10.4.4.
>>
>> So, this is a field test to see if LLVM/Clang v3.6.0rc2 fits my needs.
>>
>> I see the following build-error...
>> ...
>>
>> make[4]: Entering directory `/home/wearefam/src/mesa/mesa-git/src/mapi'
>>    CC     shared_glapi_libglapi_la-entry.lo
>> clang version 3.6.0 (tags/RELEASE_360/rc2)
>> Target: x86_64-unknown-linux-gnu
>> Thread model: posix
>> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
>> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
>> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
>> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2
>> Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
>> Candidate multilib: .;@m64
>> Candidate multilib: 32;@m32
>> Selected multilib: .;@m64
>>   "/opt/llvm-toolchain-3.6.0rc2/bin/clang" -cc1 -triple
>> x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free
>> -main-file-name entry.c -mrelocation-model static -mthread-model posix
>> -mdisable-fp-elim -relaxed-aliasing -fmath-errno -masm-verbose
>> -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu
>> x86-64 -target-linker-version 2.22 -v -g -dwarf-column-info
>> -coverage-file /home/wearefam/src/mesa/mesa-git/src/mapi/entry.c
>> -resource-dir /opt/llvm-toolchain-3.6.0rc2/bin/../lib/clang/3.6.0
>> -dependency-file .deps/shared_glapi_libglapi_la-entry.Tpo
>> -sys-header-deps -MP -MT shared_glapi_libglapi_la-entry.lo -D
>> "PACKAGE_NAME=\"Mesa\"" -D "PACKAGE_TARNAME=\"mesa\"" -D
>> "PACKAGE_VERSION=\"10.4.4\"" -D "PACKAGE_STRING=\"Mesa 10.4.4\"" -D
>> "PACKAGE_BUGREPORT=\"https://urldefense.proofpoint.com/v2/url?u=https-3A__bugs.freedesktop.org_enter-5Fbug.cgi-3Fproduct-3DMesa&d=AwID-g&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=zfmBZnnVGHeYde45pMKNnVyzeaZbdIqVLprmZCM2zzE&m=LdbG9btkWrIw7ABhWDTiHtGwFnB7cDCY6cHlnzXawlQ&s=sH_YjhwwusfBRXm5X-z7LRFkCz68ItpSfCmRnHJAYkw&e= \""
>> -D "PACKAGE_URL=\"\"" -D "PACKAGE=\"mesa\"" -D "VERSION=\"10.4.4\"" -D
>> STDC_HEADERS=1 -D HAVE_SYS_TYPES_H=1 -D HAVE_SYS_STAT_H=1 -D
>> HAVE_STDLIB_H=1 -D HAVE_STRING_H=1 -D HAVE_MEMORY_H=1 -D
>> HAVE_STRINGS_H=1 -D HAVE_INTTYPES_H=1 -D HAVE_STDINT_H=1 -D
>> HAVE_UNISTD_H=1 -D HAVE_DLFCN_H=1 -D "LT_OBJDIR=\".libs/\"" -D
>> YYTEXT_POINTER=1 -D HAVE___BUILTIN_BSWAP32=1 -D
>> HAVE___BUILTIN_BSWAP64=1 -D HAVE___BUILTIN_CLZ=1 -D
>> HAVE___BUILTIN_CLZLL=1 -D HAVE___BUILTIN_CTZ=1 -D
>> HAVE___BUILTIN_EXPECT=1 -D HAVE___BUILTIN_FFS=1 -D
>> HAVE___BUILTIN_FFSLL=1 -D HAVE___BUILTIN_POPCOUNT=1 -D
>> HAVE___BUILTIN_POPCOUNTLL=1 -D HAVE___BUILTIN_UNREACHABLE=1 -D
>> HAVE_DLADDR=1 -D HAVE_PTHREAD=1 -D HAVE_LIBEXPAT=1 -D
>> USE_EXTERNAL_DXTN_LIB=1 -D _GNU_SOURCE -D USE_SSE41 -D DEBUG -D
>> USE_X86_64_ASM -D HAVE_XLOCALE_H -D HAVE_STRTOF -D HAVE_DLOPEN -D
>> HAVE_POSIX_MEMALIGN -D HAVE_LIBDRM -D GLX_USE_DRM -D HAVE_LIBUDEV -D
>> GLX_INDIRECT_RENDERING -D GLX_DIRECT_RENDERING -D GLX_USE_TLS -D
>> HAVE_ALIAS -D HAVE_MINCORE -D HAVE_LLVM=0x0306 -D LLVM_VERSION_PATCH=0
>> -D MAPI_MODE_GLAPI -D
>> "MAPI_ABI_HEADER=\"shared-glapi/glapi_mapi_tmp.h\"" -I . -I
>> ../../include -I ../../src/mapi -I ../../src/mapi -I /opt/xorg/include
>> -internal-isystem /usr/local/include -internal-isystem
>> /opt/llvm-toolchain-3.6.0rc2/bin/../lib/clang/3.6.0/include
>> -internal-externc-isystem /usr/include/x86_64-linux-gnu
>> -internal-externc-isystem /include -internal-externc-isystem
>> /usr/include -O0 -Wall -Werror=implicit-function-declaration
>> -Werror=missing-prototypes -std=c99 -fdebug-compilation-dir
>> /home/wearefam/src/mesa/mesa-git/src/mapi -ferror-limit 19
>> -fmessage-length 0 -pthread -mstackrealign -fobjc-runtime=gcc
>> -fdiagnostics-show-option -o entry.o -x c ../../src/mapi/entry.c
>> clang -cc1 version 3.6.0 based upon LLVM 3.6.0 default target
>> x86_64-unknown-linux-gnu
>> ignoring nonexistent directory "/include"
>> ignoring duplicate directory "."
>> ignoring duplicate directory "."
>> #include "..." search starts here:
>> #include <...> search starts here:
>>   .
>>   ../../include
>>   /opt/xorg/include
>>   /usr/local/include
>>   /opt/llvm-toolchain-3.6.0rc2/bin/../lib/clang/3.6.0/include
>>   /usr/include/x86_64-linux-gnu
>>   /usr/include
>> End of search list.
>> In file included from ../../src/mapi/entry.c:49:
>> ./entry_x86-64_tls.h:66:1: warning: tentative array definition assumed
>> to have one element
>> x86_64_entry_start[];
>> ^
>> fatal error: error in backend: symbol 'x86_64_entry_start' is already defined
>> clang: error: clang frontend command failed with exit code 70 (use -v
>> to see invocation)
>> clang version 3.6.0 (tags/RELEASE_360/rc2)
>> Target: x86_64-unknown-linux-gnu
>> Thread model: posix
>> clang: note: diagnostic msg: PLEASE submit a bug report to
>> https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_bugs_&d=AwID-g&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=zfmBZnnVGHeYde45pMKNnVyzeaZbdIqVLprmZCM2zzE&m=LdbG9btkWrIw7ABhWDTiHtGwFnB7cDCY6cHlnzXawlQ&s=KIoF21N7HeIysvh3fgiAiZkFeeEw8ZEr0gu0BsHmOrU&e=  and include the crash backtrace, preprocessed
>> source, and associated run script.
>> clang: note: diagnostic msg:
>> ********************
>>
>> PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
>> Preprocessed source(s) and associated run script(s) are located at:
>> clang: note: diagnostic msg: /tmp/entry-f26a8a.c
>> clang: note: diagnostic msg: /tmp/entry-f26a8a.sh
>> clang: note: diagnostic msg:
>>
>> ********************
>> make[4]: *** [shared_glapi_libglapi_la-entry.lo] Error 1
>> make[4]: Leaving directory `/home/wearefam/src/mesa/mesa-git/src/mapi'
>> make[3]: *** [all-recursive] Error 1
>> make[3]: Leaving directory `/home/wearefam/src/mesa/mesa-git/src/mapi'
>> make[2]: *** [all] Error 2
>> make[2]: Leaving directory `/home/wearefam/src/mesa/mesa-git/src/mapi'
>> make[1]: *** [all-recursive] Error 1
>> make[1]: Leaving directory `/home/wearefam/src/mesa/mesa-git/src'
>> make: *** [all-recursive] Error 1
>> Command exited with non-zero status 2
>> ...
>>
>> I have attached my build-script, the detailed full build-log (used
>> 'clang -v' and 'make -j1') and the two diagnostic tmp-files.
>>
>> I am not sure if this is fixable in mesa by refactoring the code -
>> that's why I CCed especially Jose.

This is an issue with building Mesa with Clang, but I actually don't 
have much experience with that. (I mostly use LLVM as a JIT library.)

>>
>> If it's a llvm/clang bug, so the folks there should look.
>>
>> If you need more informations, please let me know.
>>
> Perhaps getting some (rough) idea of the commit this started failing is
> a nice start. Currently mapi is built in 3-4 different "modes", and it
> builds fine with gcc/msvc.
>
> It may be that it's a bug on our end, but it's a bit painful going
> through all the auto generated sources, the 10+ define guards and other
> magic that's inside src/mapi. Getting some idea on llvm/clang behaviour
> change should help out :-)
>
> Please open a bug-report with llvm and/or mesa, so that we have all the
> info in one place and things don't get lost.
>
> Thanks
> Emil
>

Yeah, the mapi/glapi code is a bit sensitive -- there are several 
possible configurations (assembly, no assembly, shared glapi, etc.) -- 
they all produce slightly different machine code.

Jose