[llvm-bugs] [Bug 29169] New: Compiling mesa-11.0.6 crashes clang with "fatal error: error in backend: symbol 'x86_64_entry_start' is already defined"

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29169

            Bug ID: 29169
           Summary: Compiling mesa-11.0.6 crashes clang with "fatal error:
                    error in backend: symbol 'x86_64_entry_start' is
                    already defined"
           Product: new-bugs
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: other.moxian at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17064
  --> https://llvm.org/bugs/attachment.cgi?id=17064&action=edit
the -emit-llvm output that breaks llc

I'm compiling mesa-11.0.6 with clang on gentoo from portage, and encounter the
following (reduced) problem:

$ clang -DUSE_X86_64_ASM -DGLX_USE_TLS  -I../../include -I../../src  
-DMAPI_ABI_HEADER=\"shared-glapi/glapi_mapi_tmp.h\"   -c entry.c  -v
clang version 3.7.1 (tags/RELEASE_371/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
Selected GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3
 "/usr/bin/x86_64-pc-linux-gnu-clang-3.7" -cc1 -triple x86_64-pc-linux-gnu
-emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name
entry.c -mrelocation-model static -mthread-model posix -mdisable-fp-elim
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables
-fuse-init-array -target-cpu x86-64 -v -dwarf-column-info -coverage-file
/home/moxian/temp/mesa/mesa-11.0.6/src/mapi/entry.c -resource-dir
/usr/bin/../lib/clang/3.7.1 -D USE_X86_64_ASM -D GLX_USE_TLS -D
"MAPI_ABI_HEADER=\"shared-glapi/glapi_mapi_tmp.h\"" -I ../../include -I
../../src -internal-isystem /usr/local/include -internal-isystem
/usr/bin/../lib/clang/3.7.1/include -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdebug-compilation-dir
/home/moxian/temp/mesa/mesa-11.0.6/src/mapi -ferror-limit 19 -fmessage-length
136 -mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option
-fcolor-diagnostics -o entry.o -x c entry.c
clang -cc1 version 3.7.1 based upon LLVM 3.7.1 default target
x86_64-pc-linux-gnu
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 ../../include
 ../../src
 /usr/bin/../lib/clang/3.7.1/include
 /usr/include
End of search list.
In file included from entry.c:51:
./entry_x86-64_tls.h:65:1: 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
x86_64-pc-linux-gnu-clang-3.7: error: clang frontend command failed with exit
code 70 (use -v to see invocation)
clang version 3.7.1 (tags/RELEASE_371/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: PLEASE submit a bug report
to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source,
and associated run script.
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: /tmp/entry-85ce4f.c
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: /tmp/entry-85ce4f.sh
x86_64-pc-linux-gnu-clang-3.7: note: diagnostic msg: 

********************


Running with -emit-llvm works fine:

$ clang -DUSE_X86_64_ASM -DGLX_USE_TLS 
-DMAPI_ABI_HEADER=\"shared-glapi/glapi_mapi_tmp.h\"   -c entry-85ce4f.c
-emit-llvm -o entry-85ce4f.bc
In file included from entry.c:51:
./entry_x86-64_tls.h:65:1: warning: tentative array definition assumed to have
one element
x86_64_entry_start[];
^
1 warning generated.


$ llc entry-85ce4f.bc
LLVM ERROR: symbol 'x86_64_entry_start' is already defined


$ bugpoint run-llc entry-85ce4f.bc
Read input file      : 'entry-85ce4f.bc'
*** All input ok
Initializing execution environment: Found lli: /usr/bin/lli
Sorry, I can't automatically select a safe interpreter!

Exiting.

$ uname -a
Linux engi 4.4.6-gentoo #6 SMP Sun Aug 28 05:01:42 UTC 2016 x86_64 Intel(R)
Core(TM) i5-6600 CPU @ 3.30GHz GenuineIntel GNU/Linux



The diagnostic .c (preprocessed) .sh .bc and (just in case) full build log and
gentoo's emerge diagnostic info attached.

It's probably important to note that I don't encounter this problem if I try to
compile the original mesa source (i.e. not from gentoo's portage). Not that I'm
successful in compiling that, but at least this crash does not occur.

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