[Bug libc/25271] undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling with -std=c11

[romain.geissler at amadeus dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25271

Romain Geissler <romain.geissler at amadeus dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |romain.geissler at amadeus dot com

--- Comment #12 from Romain Geissler <romain.geissler at amadeus dot com> ---
Hi,

Please note that this cases happened to me when I tried to bootstrap clang/llvm
using the latest glibc master:

FAILED: CMakeFiles/clang_rt.builtins-x86_64.dir/emutls.c.o 

/workdir/build/final-system/llvm-build/./bin/clang --target=x86_64-1a-linux-gnu
-DVISIBILITY_HIDDEN  -O2 -msse -msse2 -msse3
-I/workdir/build/final-system/llvm-temporary-static-dependencies/install/include
-I/workdir/build/final-system/llvm-temporary-static-dependencies/install/include/ncursesw
-O3 -DNDEBUG    -m64 -std=c11 -fPIC -fno-builtin -fvisibility=hidden
-fomit-frame-pointer -MD -MT CMakeFiles/clang_rt.builtins-x86_64.dir/emutls.c.o
-MF CMakeFiles/clang_rt.builtins-x86_64.dir/emutls.c.o.d -o
CMakeFiles/clang_rt.builtins-x86_64.dir/emutls.c.o   -c
/workdir/src/llvm-11.0.0/compiler-rt/lib/builtins/emutls.c

/workdir/src/llvm-11.0.0/compiler-rt/lib/builtins/emutls.c:52:39: error: use of
undeclared identifier 'PTHREAD_MUTEX_DEFAULT'

static pthread_mutex_t emutls_mutex = PTHREAD_MUTEX_INITIALIZER;

                                      ^

/opt/1A/toolchain/x86_64-v21.0.0/include/pthread.h:87:36: note: expanded from
macro 'PTHREAD_MUTEX_INITIALIZER'

 { {  __PTHREAD_MUTEX_INITIALIZER (PTHREAD_MUTEX_DEFAULT) } }

                                   ^


So I am not sure whether glibc or clang must be changed, but I guess that's
annoying that a few days before the glibc 2.31 there is such a build failure
when building clang with this new glibc ;)

Cheers,
Romain

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