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| author | Fangrui Song <i@maskray.me> | 2021-03-09 10:52:26 -0800 |
|---|---|---|
| committer | Fangrui Song <i@maskray.me> | 2021-03-09 10:52:26 -0800 |
| commit | c11ff4bbada3b5127a1f010e0a97a1e6e46fb61a (patch) | |
| tree | 154e5f482ad93d1e3cce831b4f0c9ffbc83af35a /clang/lib/Frontend/CompilerInvocation.cpp | |
| parent | cc52ea30012d3d9495a41255be50dccc77464cad (diff) | |
| download | llvm-c11ff4bbada3b5127a1f010e0a97a1e6e46fb61a.zip llvm-c11ff4bbada3b5127a1f010e0a97a1e6e46fb61a.tar.gz llvm-c11ff4bbada3b5127a1f010e0a97a1e6e46fb61a.tar.bz2 | |
Define __GCC_HAVE_DWARF2_CFI_ASM if applicable
In -fno-exceptions -fno-asynchronous-unwind-tables -g0 mode,
GCC does not emit `.cfi_*` directives.
```
% diff <(gcc -fno-asynchronous-unwind-tables -dM -E a.c) <(gcc -dM -E a.c)
130a131
> #define __GCC_HAVE_DWARF2_CFI_ASM 1
```
This macro is useful because code can decide whether inline asm should include `.cfi_*` directives.
`.cfi_*` directives without `.cfi_startproc` can cause assembler errors
(integrated assembler: `this directive must appear between .cfi_startproc and .cfi_endproc directives`).
Differential Revision: https://reviews.llvm.org/D97743
Diffstat (limited to 'clang/lib/Frontend/CompilerInvocation.cpp')
| -rw-r--r-- | clang/lib/Frontend/CompilerInvocation.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp index 2606e9f..bd02408 100644 --- a/clang/lib/Frontend/CompilerInvocation.cpp +++ b/clang/lib/Frontend/CompilerInvocation.cpp @@ -4355,6 +4355,11 @@ bool CompilerInvocation::CreateFromArgsImpl( Res.getCodeGenOpts().Argv0 = Argv0; Res.getCodeGenOpts().CommandLineArgs = CommandLineArgs; + if ((T.isOSBinFormatELF() || T.isOSBinFormatMachO()) && + (Res.getLangOpts()->Exceptions || Res.getCodeGenOpts().UnwindTables || + Res.getCodeGenOpts().getDebugInfo() != codegenoptions::NoDebugInfo)) + Res.getPreprocessorOpts().addMacroDef("__GCC_HAVE_DWARF2_CFI_ASM=1"); + Success &= FixupInvocation(Res, Diags, Args, DashX); return Success; |