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Add -fkeep-system-includes modifier for -E
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.
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int dashE_1; | ||
#include <a.h> | ||
int dashE_2; |
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int a_1; | ||
#include <b.h> | ||
int a_2; |
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int b_1; |
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// RUN: mkdir %t.dir | ||
// RUN: %clang_cc1 -E -fkeep-system-includes -I %S/Inputs/dashE -isystem %S/Inputs/dashE/sys %s | FileCheck %s | ||
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int main_1 = 1; | ||
#include <a.h> | ||
int main_2 = 1; | ||
#include "dashE.h" | ||
int main_3 = 1; | ||
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// CHECK: main_1 | ||
// CHECK: #include <a.h> | ||
// CHECK-NOT: a_1 | ||
// CHECK-NOT: a_2 | ||
// CHECK-NOT: b.h | ||
// CHECK: main_2 | ||
// CHECK-NOT: #include "dashE.h" | ||
// CHECK: dashE_1 | ||
// CHECK: #include <a.h> | ||
// CHECK-NOT: a_1 | ||
// CHECK-NOT: a_2 | ||
// CHECK-NOT: b.h | ||
// CHECK: dashE_2 | ||
// CHECK: main_3 |
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// RUN: not %clang -c -fminimize-whitespace %s 2>&1 | FileCheck %s --check-prefix=ON | ||
// ON: error: invalid argument '-fminimize-whitespace' only allowed with '-E' | ||
// RUN: not %clang -c -fminimize-whitespace %s 2>&1 | FileCheck %s --check-prefix=ON -DOPT=-fminimize-whitespace | ||
// RUN: not %clang -c -fkeep-system-includes %s 2>&1 | FileCheck %s --check-prefix=ON -DOPT=-fkeep-system-includes | ||
// 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 | ||
// OFF: error: invalid argument '-fno-minimize-whitespace' only allowed with '-E' | ||
// RUN: not %clang -c -fno-minimize-whitespace %s 2>&1 | FileCheck %s --check-prefix=OFF -DOPT=-fno-minimize-whitespace | ||
// RUN: not %clang -c -fno-keep-system-includes %s 2>&1 | FileCheck %s --check-prefix=OFF -DOPT=-fno-keep-system-includes | ||
// 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 | ||
// ASM: error: '-fminimize-whitespace' invalid for input of type assembler-with-cpp | ||
// RUN: not %clang -E -fminimize-whitespace -x assembler-with-cpp %s 2>&1 | FileCheck %s --check-prefix=ASM -DOPT=-fminimize-whitespace | ||
// RUN: not %clang -E -fkeep-system-includes -x assembler-with-cpp %s 2>&1 | FileCheck %s --check-prefix=ASM -DOPT=-fkeep-system-includes | ||
// ASM: error: '[[OPT]]' invalid for input of type assembler-with-cpp |