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LexerParser: Do not override existing _POSIX_C_SOURCE definition

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In commit f034b0f663 (CMake compilation: do not use compiler extensions,
2020-03-14, v3.18.0-rc1~494^2) we explicitly defined `_POSIX_C_SOURCE`
to ensure availability of POSIX APIs even when compiler extensions are
not enabled.  Update the code to avoid redefining `_POSIX_C_SOURCE` if
it is already defined.  This occurs when building our release binaries
as configured in `Utilities/Release/linux`, where we define
`_POSIX_C_SOURCE` explicitly on the compiler command line.
This commit is contained in:
Brad King
2021-02-05 07:11:58 -05:00
parent 82cfeeb484
commit a8b41e2c68
1 changed files with 1 additions and 1 deletions
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Source/cmStandardLexer.h
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@@ -7,7 +7,7 @@
/* Needed for glibc < 2.12 */
# define _XOPEN_SOURCE 600
#endif
#if !defined(_WIN32) && !defined(__sun)
#if !defined(_POSIX_C_SOURCE) && !defined(_WIN32) && !defined(__sun)
/* POSIX APIs are needed */
# define _POSIX_C_SOURCE 200809L
#endif