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[ELF] #undef PPC to support GCC powerpc32 build

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GCC's powerpc32 port predefines `PPC` as a macro in GNU C++ mode in some configurations (Linux,
FreeBSD, and some others. See `builtin_define_std ("PPC"); ` in gcc/config/rs6000).

```
% powerpc-linux-gnu-g++ -E -dM -xc++ /dev/null -o - | grep -w PPC
#define PPC 1
```

Fixes https://bugs.gentoo.org/829599

Reviewed By: thesamesam

Differential Revision: https://reviews.llvm.org/D116017
This commit is contained in:
Fangrui Song 2021-12-20 10:12:50 -08:00
parent 4c5476b066
commit bee5bc9075
1 changed files with 3 additions and 0 deletions
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3
lld/ELF/Arch/PPC.cpp
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@ -20,6 +20,9 @@ using namespace llvm::ELF;
using namespace lld;
using namespace lld::elf;
// Undefine the macro predefined by GCC powerpc32.
#undef PPC
namespace {
class PPC final : public TargetInfo {
public: