85b1354098
When the -fdirectives-only option is used together with -E, the preprocessor output reflects evaluation of if/then/else directives. As such, it preserves defines and undefs of macros that are still live after such processing. The intent is that this output could be consumed as input to generate considered a C++20 header unit. We strip out any (unused) defines that come from built-in, built-in-file or command line; these are re-added when the preprocessed source is consumed. Differential Revision: https://reviews.llvm.org/D121099
69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
// Test check that consuming -E -fdirectives-only output produces the expected
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// header unit.
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// RUN: rm -rf %t
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// RUN: mkdir -p %t
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// RUN: split-file %s %t
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// RUN: cd %t
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// RUN: %clang_cc1 -std=c++20 -E -fdirectives-only -xc++-user-header hu-01.h \
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// RUN: -o hu-01.iih
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// RUN: %clang_cc1 -std=c++20 -emit-header-unit \
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// RUN: -xc++-user-header-cpp-output hu-01.iih -o hu-01.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-header-unit -xc++-user-header hu-02.h \
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// RUN: -DFOO -fmodule-file=hu-01.pcm -o hu-02.pcm -Rmodule-import 2>&1 | \
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// RUN: FileCheck --check-prefix=CHECK-IMP %s -DTDIR=%t
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//--- hu-01.h
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#ifndef __GUARD
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#define __GUARD
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int baz(int);
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#define FORTYTWO 42
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#define SHOULD_NOT_BE_DEFINED -1
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#undef SHOULD_NOT_BE_DEFINED
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#endif // __GUARD
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// expected-no-diagnostics
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//--- hu-02.h
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export import "hu-01.h";
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#if !defined(FORTYTWO) || FORTYTWO != 42
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#error FORTYTWO missing in hu-02
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#endif
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#ifndef __GUARD
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#error __GUARD missing in hu-02
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#endif
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#ifdef SHOULD_NOT_BE_DEFINED
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#error SHOULD_NOT_BE_DEFINED is visible
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#endif
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// Make sure that we have not discarded macros from the builtin file.
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#ifndef __cplusplus
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#error we dropped a defined macro
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#endif
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#define KAP 6174
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#ifdef FOO
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#define FOO_BRANCH(X) (X) + 1
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inline int foo(int x) {
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if (x == FORTYTWO)
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return FOO_BRANCH(x);
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return FORTYTWO;
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}
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#else
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#define BAR_BRANCH(X) (X) + 2
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inline int bar(int x) {
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if (x == FORTYTWO)
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return BAR_BRANCH(x);
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return FORTYTWO;
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}
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#endif
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// CHECK-IMP: remark: importing module './hu-01.h' from 'hu-01.pcm'
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