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Use a better check for Solaris (SunOS 5.x)
The __sun__ macro is not always defined by Oracle Solaris Studio, but __sun is, as it is in GCC and Clang. By itself, __sun__ also matches the very obsolete SunOS 4.x BSD-based operating system, hence the need for __SVR4 as well. See https://web.archive.org/web/20180221212835/http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system for more information on operating system macro checks.
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@ -45,11 +45,11 @@
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#if ! defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 700
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#if ! defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 700
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# undef _XOPEN_SOURCE
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# undef _XOPEN_SOURCE
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# if ! defined(__sun__)
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# if defined(__sun) && defined(__SVR4)
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# define _XOPEN_SOURCE 700 // Use SUSv4 where possible
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# define _XOPEN_SOURCE 600 // Use SUSv3 on SunOS 5.x
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# define __EXTENSIONS__ 1 // ... with Solaris extensions
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# else
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# else
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# define _XOPEN_SOURCE 600 // Except on SunOS 5.x
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# define _XOPEN_SOURCE 700 // Use SUSv4 everywhere else
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# define __EXTENSIONS__ 1 // ... but use Solaris extensions
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# endif
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# endif
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#endif
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#endif
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