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This option will cause -E to preserve the #include directives for system headers, rather than expanding them into the output. This can greatly reduce the volume of preprocessed source text in a test case, making test case reduction simpler. Note that -fkeep-system-includes is not always appropriate. For example, if the problem you want to reproduce is induced by a system header file, it's better to expand those headers fully. If your source defines symbols that influence the content of a system header (e.g., _POSIX_SOURCE) then -E will eliminate the definition, potentially changing the meaning of the preprocessed source. If you use -isystem to point to non-system headers, for example to suppress warnings in third-party software, those will not be expanded and might make the preprocessed source less useful as a test case.
12 lines
947 B
C
12 lines
947 B
C
// RUN: not %clang -c -fminimize-whitespace %s 2>&1 | FileCheck %s --check-prefix=ON -DOPT=-fminimize-whitespace
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// RUN: not %clang -c -fkeep-system-includes %s 2>&1 | FileCheck %s --check-prefix=ON -DOPT=-fkeep-system-includes
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// ON: error: invalid argument '[[OPT]]' only allowed with '-E'
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// RUN: not %clang -c -fno-minimize-whitespace %s 2>&1 | FileCheck %s --check-prefix=OFF -DOPT=-fno-minimize-whitespace
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// RUN: not %clang -c -fno-keep-system-includes %s 2>&1 | FileCheck %s --check-prefix=OFF -DOPT=-fno-keep-system-includes
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// OFF: error: invalid argument '[[OPT]]' only allowed with '-E'
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// RUN: not %clang -E -fminimize-whitespace -x assembler-with-cpp %s 2>&1 | FileCheck %s --check-prefix=ASM -DOPT=-fminimize-whitespace
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// RUN: not %clang -E -fkeep-system-includes -x assembler-with-cpp %s 2>&1 | FileCheck %s --check-prefix=ASM -DOPT=-fkeep-system-includes
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// ASM: error: '[[OPT]]' invalid for input of type assembler-with-cpp
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