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
9 lines
529 B
C
9 lines
529 B
C
// RUN: not %clang -c -fminimize-whitespace %s 2>&1 | FileCheck %s --check-prefix=ON
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// ON: error: invalid argument '-fminimize-whitespace' only allowed with '-E'
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// RUN: not %clang -c -fno-minimize-whitespace %s 2>&1 | FileCheck %s --check-prefix=OFF
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// OFF: error: invalid argument '-fno-minimize-whitespace' 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
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// ASM: error: '-fminimize-whitespace' invalid for input of type assembler-with-cpp
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