[PATCH] D41544: Use backslash escape, replacing xargs -0 in test macro-multiline.c
Hubert Tong via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Fri Dec 22 09:03:45 PST 2017
hubert.reinterpretcast created this revision.
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.
@@ -1,4 +1,4 @@
-// RUN: printf -- "-DX=A\nTHIS_SHOULD_NOT_EXIST_IN_THE_OUTPUT" | xargs -0 %clang -E %s | FileCheck -strict-whitespace %s
+// 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.
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