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Use dllimport/dllexport with clang and gcc on Cygwin.

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This is required at least for Boost.WinAPI to match the declarations in
Windows SDK headers, which use dllimport.

Also, for clang on Windows, use dllimport/dllexport even beyond Cygwin.
The compiler does support these attributes, and it should for
compatibility with Windows headers.
This commit is contained in:
Andrey Semashev
2018-03-11 17:37:13 +03:00
parent 5ad0730630
commit 3b709bc3ed
2 changed files with 8 additions and 4 deletions
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8
include/boost/config/compiler/clang.hpp
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@ -98,11 +98,15 @@
//
// Dynamic shared object (DSO) and dynamic-link library (DLL) support
//
#if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32)
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) || defined(__CYGWIN__)
# define BOOST_HAS_DECLSPEC
# define BOOST_SYMBOL_EXPORT __attribute__((__dllexport__))
# define BOOST_SYMBOL_IMPORT __attribute__((__dllimport__))
#else
# define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
# define BOOST_SYMBOL_IMPORT
# define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
#endif
#define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
//
// The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through

4
include/boost/config/compiler/gcc.hpp
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@ -99,10 +99,10 @@
// Dynamic shared object (DSO) and dynamic-link library (DLL) support
//
#if __GNUC__ >= 4
# if (defined(_WIN32) || defined(__WIN32__) || defined(WIN32)) && !defined(__CYGWIN__)
# 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.
// so does not define _WIN32 or its variants, but still supports dllexport/dllimport.
# define BOOST_HAS_DECLSPEC
# define BOOST_SYMBOL_EXPORT __attribute__((__dllexport__))
# define BOOST_SYMBOL_IMPORT __attribute__((__dllimport__))