[PATCH] D61765: [OpenMP][Clang][BugFix] Split declares and math functions inclusion.

[Gheorghe-Teodor Bercea via Phabricator via cfe-commits]

gtbercea marked an inline comment as done.
gtbercea added inline comments.


================
Comment at: lib/Headers/__clang_cuda_math_forward_declares.h:30-38
+#ifndef _OPENMP
+__DEVICE__ long abs(long);
+__DEVICE__ long long abs(long long);
+#else
+#ifndef __cplusplus
 __DEVICE__ long abs(long);
 __DEVICE__ long long abs(long long);
----------------
tra wrote:
> I'm not quite sure what's the idea here. It may be worth adding a comment.
> 
> It could also be expressed somewhat simpler:
> 
> ```
> #if !(defined(_OPENMP) && defined(__cplusplus))
> ...
> #endif
> ```
> 
When these two functions definitions are here or in the __clang_cuda_cmath.h header then I get the following error (adapted for the __clang_cuda_cmath.h case):


```
/usr/lib/gcc/ppc64le-redhat-linux/4.8.5/../../../../include/c++/4.8.5/cstdlib:166:3: error: declaration conflicts with target of using declaration already in scope
  abs(long __i) { return __builtin_labs(__i); }
  ^
/autofs/home/gbercea/patch-compiler/obj-release/lib/clang/9.0.0/include/__clang_cuda_cmath.h:40:17: note: target of using declaration
__DEVICE__ long abs(long __n) { return ::labs(__n); }
                ^
/usr/lib/gcc/ppc64le-redhat-linux/4.8.5/../../../../include/c++/4.8.5/cstdlib:122:11: note: using declaration
  using ::abs;
          ^
/usr/lib/gcc/ppc64le-redhat-linux/4.8.5/../../../../include/c++/4.8.5/cstdlib:174:3: error: declaration conflicts with target of using declaration already in scope
  abs(long long __x) { return __builtin_llabs (__x); }
  ^
/autofs/home/gbercea/patch-compiler/obj-release/lib/clang/9.0.0/include/__clang_cuda_cmath.h:39:22: note: target of using declaration
__DEVICE__ long long abs(long long __n) { return ::llabs(__n); }
                     ^
/usr/lib/gcc/ppc64le-redhat-linux/4.8.5/../../../../include/c++/4.8.5/cstdlib:122:11: note: using declaration
  using ::abs;
```




Repository:
  rC Clang

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  https://reviews.llvm.org/D61765/new/

https://reviews.llvm.org/D61765