tree d38eace299b2dad55b497d23ce3aabb96bb28539
parent c267928700778f01870094009fe6afdce79635a6
author yonghong-song <yhs@fb.com> 1753227430 -0700
committer GitHub <noreply@github.com> 1753227430 -0700
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[BPF] Fix build warnings due to a static var in header file (#150128)

Simon Pilgrim ([1]) and Anton reported that the following warning will
appear when building clang compiler:
```
In file included from .../llvm-project/llvm/lib/Target/BPF/BPFASpaceCastSimplifyPass.cpp:9: .../llvm-project/llvm/lib/Target/BPF/BPF.h:25:20: warning: ‘llvm::BPF_TRAP’ defined but not used [-Wunused-variable]
   25 | static const char *BPF_TRAP = "__bpf_trap";
      |                    ^~~~~~~~
...
In file included from .../llvm-project/llvm/lib/Target/BPF/MCTargetDesc/BPFInstPrinter.cpp:14:
.../llvm-project/llvm/lib/Target/BPF/BPF.h:25:20: warning: ‘llvm::BPF_TRAP’ defined but not used [-Wunused-variable]
   25 | static const char *BPF_TRAP = "__bpf_trap";
      |                    ^~~~~~~~
...
```
Instead of using static const variable, use macro to silence warnings.

  [1] https://github.com/llvm/llvm-project/pull/131731