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| author | Aaron Ballman <aaron@aaronballman.com> | 2025-11-03 07:50:25 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-11-03 07:50:25 -0500 |
| commit | df1d786c460e0e47c9074f3533f098190ebfbc1b (patch) | |
| tree | 0154a2150d37f9f81f3194657edd67c644d7a382 /clang/lib/Frontend/InitPreprocessor.cpp | |
| parent | ef9ff15587cd0aa2676553b64ec3b11e36ebfd02 (diff) | |
[C2y] Support WG14 N3457, the __COUNTER__ macro (#162662)
This implements the parts of
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3457.htm which were
adopted at the recent meeting in Brno.
Clang already implemented `__COUNTER__`, but needed some changes for
conformance. Specifically, we now diagnose when the macro is expanded
more than 2147483647 times. Additionally, we now give the expected
extension and pre-compat warnings for the feature.
To support testing the limits, this also adds a -cc1-only option,
`-finitial-counter-value=`, which lets you specify the initial value the
`__COUNTER__` macro should expand to.
Diffstat (limited to 'clang/lib/Frontend/InitPreprocessor.cpp')
| -rw-r--r-- | clang/lib/Frontend/InitPreprocessor.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp index 8602be1d8a17..ed3f1f93d25d 100644 --- a/clang/lib/Frontend/InitPreprocessor.cpp +++ b/clang/lib/Frontend/InitPreprocessor.cpp @@ -1542,6 +1542,9 @@ void clang::InitializePreprocessor(Preprocessor &PP, llvm::raw_string_ostream Predefines(PredefineBuffer); MacroBuilder Builder(Predefines); + // Ensure that the initial value of __COUNTER__ is hooked up. + PP.setCounterValue(InitOpts.InitialCounterValue); + // Emit line markers for various builtin sections of the file. The 3 here // marks <built-in> as being a system header, which suppresses warnings when // the same macro is defined multiple times. |