llvm-project/clang/test/Preprocessor/macro-multiline.c

// RUN: printf -- "-DX=A\\\\\nTHIS_SHOULD_NOT_EXIST_IN_THE_OUTPUT\n" | xargs %clang -E %s | FileCheck -strict-whitespace %s

// Per GCC -D semantics, \n and anything that follows is ignored.

// CHECK: {{^START A END$}}
START X END
Use backslash escape, replacing xargs -0 in test macro-multiline.c Summary: xargs supports escaping of newline characters with backslash. xargs -0 is neither part of POSIX nor the LSB. This patch removes the -0 option and adjusts the input to xargs accordingly; that is, the input is a text file not ending in an incomplete line, and the newline of interest is preceded by a backslash. Note: The treatment of escaped newline characters is not as clearly specified by POSIX as for escaped blank characters; however, the same can be said for escaped backslashes. It is slightly more clear for the case where the -I option is used; however, -I is also of limited portability. Reviewers: bruno Reviewed By: bruno Subscribers: bruno, rcraik, cfe-commits Differential Revision: https://reviews.llvm.org/D41544 llvm-svn: 321828 2018-01-05 06:58:30 +08:00			`// RUN: printf -- "-DX=A\\\\\nTHIS_SHOULD_NOT_EXIST_IN_THE_OUTPUT\n" \| xargs %clang -E %s \| FileCheck -strict-whitespace %s`
Fix and restore the macro-multiline.c test This test didn't work as intended and was ultimately disabled some years ago in r169458. Indeed it's not clear if the '\n' was ever passed through to the driver correctly given that lit would insert '&& {' at the newline. Test rewritten to use printf/xargs to insert '\n' in a more reliable manner and to use FileCheck for verification. llvm-svn: 206703 2014-04-20 05:40:58 +08:00
			`// Per GCC -D semantics, \n and anything that follows is ignored.`

			`// CHECK: {{^START A END$}}`
			`START X END`