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7bcc21027d
For example, given:
#define bool _Bool
_Bool i;
void fn() { 1; }
-ast-print produced:
tmp.c:3:13: warning: expression result unused
void fn() { 1; }
^
bool i;
void fn() {
1;
}
That fails to compile because bool is undefined.
Details:
Diagnostics print _Bool as bool when the latter is defined as the
former. However, diagnostics were altering the printing policy for
-ast-print as well. The printed source was then invalid because the
preprocessor eats the bool definition.
Problematic diagnostics included suppressed warnings (e.g., add
-Wno-unused-value to the above example), including those that are
suppressed by default.
This patch fixes this bug and cleans up some related comments.
Reviewed by: aaron.ballman, rsmith
Differential Revision: https://reviews.llvm.org/D45093
llvm-svn: 332275
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
// RUN: %clang_cc1 -verify -ast-print %s -xc -DDEF_BOOL_CBOOL \
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// RUN: | FileCheck %s --check-prefixes=BOOL-AS-CBOOL,CBOOL
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//
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// RUN: %clang_cc1 -verify -ast-print %s -xc -DDEF_BOOL_CBOOL -DDIAG \
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// RUN: | FileCheck %s --check-prefixes=BOOL-AS-CBOOL,CBOOL
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//
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// RUN: %clang_cc1 -verify -ast-print %s -xc -DDEF_BOOL_INT \
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// RUN: | FileCheck %s --check-prefixes=BOOL-AS-INT,CBOOL
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//
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// RUN: %clang_cc1 -verify -ast-print %s -xc -DDEF_BOOL_INT -DDIAG \
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// RUN: | FileCheck %s --check-prefixes=BOOL-AS-INT,CBOOL
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//
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// RUN: %clang_cc1 -verify -ast-print %s -xc++ \
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// RUN: | FileCheck %s --check-prefixes=BOOL-AS-BOOL
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//
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// RUN: %clang_cc1 -verify -ast-print %s -xc++ -DDIAG \
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// RUN: | FileCheck %s --check-prefixes=BOOL-AS-BOOL
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#if DEF_BOOL_CBOOL
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# define bool _Bool
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#elif DEF_BOOL_INT
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# define bool int
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#endif
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// BOOL-AS-CBOOL: _Bool i;
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// BOOL-AS-INT: int i;
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// BOOL-AS-BOOL: bool i;
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bool i;
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#ifndef __cplusplus
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// CBOOL: _Bool j;
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_Bool j;
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#endif
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// Induce a diagnostic (and verify we actually managed to do so), which used to
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// permanently alter the -ast-print printing policy for _Bool. How bool is
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// defined by the preprocessor is examined only once per compilation, when the
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// diagnostic is emitted, and it used to affect the entirety of -ast-print, so
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// test only one definition of bool per compilation.
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#if DIAG
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void fn() { 1; } // expected-warning {{expression result unused}}
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#else
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// expected-no-diagnostics
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#endif
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