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ae6b400002
This patch adds the -fminimize-whitespace with the following effects: * If combined with -E, remove as much non-line-breaking whitespace as possible. * If combined with -E -P, removes as much whitespace as possible, including line-breaks. The motivation is to reduce the amount of insignificant changes in the preprocessed output with source files where only whitespace has been changed (add/remove comments, clang-format, etc.) which is in particular useful with ccache. A patch for ccache for using this flag has been proposed to ccache as well: https://github.com/ccache/ccache/pull/815, which will use -fnormalize-whitespace when clang-13 has been detected, and additionally uses -P in "unify_mode". ccache already had a unify_mode in an older version which was removed because of problems that using the preprocessor itself does not have (such that the custom tokenizer did not recognize C++11 raw strings). This patch slightly reorganizes which part is responsible for adding newlines that are required for semantics. It is now either startNewLineIfNeeded() or MoveToLine() but never both; this avoids the ShouldUpdateCurrentLine workaround and avoids redundant lines being inserted in some cases. It also fixes a mandatory newline not inserted after a _Pragma("...") that is expanded into a #pragma. Reviewed By: aaron.ballman Differential Revision: https://reviews.llvm.org/D104601
87 lines
1.1 KiB
C
87 lines
1.1 KiB
C
// RUN: %clang_cc1 -E %s 2>&1 | FileCheck %s -strict-whitespace
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// RUN: %clang_cc1 -E -fminimize-whitespace %s 2>&1 | FileCheck %s -strict-whitespace
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// PR6101
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int a;
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// CHECK: # 1 "{{.*}}line-directive-output.c"
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// Check that we do not emit an enter marker for the main file.
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// CHECK-NOT: # 1 "{{.*}}line-directive-output.c" 1
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// CHECK: int a;
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// CHECK-NEXT: # 50 "{{.*}}line-directive-output.c"
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// CHECK-NEXT: int b;
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#line 50
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int b;
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// CHECK: # 13 "{{.*}}line-directive-output.c"
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// CHECK-NEXT: int c;
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# 13
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int c;
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// CHECK-NEXT: # 1 "A.c"
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#line 1 "A.c"
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// CHECK-NEXT: # 2 "A.c"
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#line 2
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// CHECK-NEXT: # 1 "B.c"
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#line 1 "B.c"
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// CHECK-NEXT: # 1000 "A.c"
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#line 1000 "A.c"
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int y;
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// CHECK: # 1010 "A.c"
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int z;
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extern int x;
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# 3 "temp2.h" 1
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extern int y;
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# 7 "A.c" 2
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extern int z;
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// CHECK: # 25 "A.c"
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// CHECK: # 50 "C.c" 1
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# 50 "C.c" 1
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// CHECK-NEXT: # 2000 "A.c" 2
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# 2000 "A.c" 2
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# 42 "A.c"
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# 44 "A.c"
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# 49 "A.c"
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// CHECK: # 50 "a\n.c"
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# 50 "a\012.c"
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# 1 "system.h" 3
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# 2
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void sys_foo(void);
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// CHECK: # 1 "system.h" 3
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// CHECK-NEXT: # 2 "system.h" 3
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// CHECK-NEXT: void sys_foo(void);
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