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Fix for cygwin symbol visibility - sometimes _WIN32 may be defined even on cygwin.

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Fixes #4670.

[SVN r65530]
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John Maddock committed 2010-09-22 08:24:07 +00:00
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commit c02ec6995d
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include/boost/config/compiler/gcc.hpp
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@@ -115,7 +115,7 @@
// Dynamic shared object (DSO) and dynamic-link library (DLL) support
//
#if __GNUC__ >= 4
# if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
# if (defined(_WIN32) || defined(__WIN32__) || defined(WIN32)) && !defined(__CYGWIN__)
// All Win32 development environments, including 64-bit Windows and MinGW, define
// _WIN32 or one of its variant spellings. Note that Cygwin is a POSIX environment,
// so does not define _WIN32 or its variants.