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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
36 lines
710 B
C
36 lines
710 B
C
// RUN: %clang_cc1 -E %s | FileCheck --strict-whitespace %s
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// RUN: %clang_cc1 -E -P -fminimize-whitespace %s | FileCheck --strict-whitespace %s --check-prefix=MINWS
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#define A(b) -#b , - #b , -# b , - # b
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A()
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// CHECK: {{^}}-"" , - "" , -"" , - ""{{$}}
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// MINWS: {{^}}-"",-"",-"",-""
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#define t(x) #x
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t(a
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c)
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// CHECK: {{^}}"a c"{{$}}
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// MINWS-SAME: "a c"
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#define str(x) #x
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#define f(x) str(-x)
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f(
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1)
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// CHECK: {{^}}"-1"
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// MINWS-SAME: "-1"
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#define paste(a,b) str(a<b##ld)
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paste(hello1, wor)
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paste(hello2,
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wor)
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paste(hello3,
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wor)
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// CHECK: {{^}}"hello1<world"
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// CHECK: {{^}}"hello2<world"
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// CHECK: {{^}}"hello3<world"
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// MINWS-SAME: {{^}}"hello1<world""hello2<world""hello3<world"{{$}}
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