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Diffstat (limited to 'libcommon/export.hxx')
| -rw-r--r-- | libcommon/export.hxx | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/libcommon/export.hxx b/libcommon/export.hxx new file mode 100644 index 0000000..0de4565 --- /dev/null +++ b/libcommon/export.hxx @@ -0,0 +1,39 @@ +#pragma once + +// Normally we don't export class templates (but do complete specializations), +// inline functions, and classes with only inline member functions. Exporting +// classes that inherit from non-exported/imported bases (e.g., std::string) +// will end up badly. The only known workarounds are to not inherit or to not +// export. Also, MinGW GCC doesn't like seeing non-exported functions being +// used before their inline definition. The workaround is to reorder code. In +// the end it's all trial and error. + +#if defined(LIBCOMMON_STATIC) // Using static. +# define LIBCOMMON_SYMEXPORT +#elif defined(LIBCOMMON_STATIC_BUILD) // Building static. +# define LIBCOMMON_SYMEXPORT +#elif defined(LIBCOMMON_SHARED) // Using shared. +# ifdef _WIN32 +# define LIBCOMMON_SYMEXPORT __declspec(dllimport) +# else +# define LIBCOMMON_SYMEXPORT +# endif +#elif defined(LIBCOMMON_SHARED_BUILD) // Building shared. +# ifdef _WIN32 +# define LIBCOMMON_SYMEXPORT __declspec(dllexport) +# else +# define LIBCOMMON_SYMEXPORT +# endif +#else +// If none of the above macros are defined, then we assume we are being used +// by some third-party build system that cannot/doesn't signal the library +// type. Note that this fallback works for both static and shared libraries +// provided the library only exports functions (in other words, no global +// exported data) and for the shared case the result will be sub-optimal +// compared to having dllimport. If, however, your library does export data, +// then you will probably want to replace the fallback with the (commented +// out) error since it won't work for the shared case. +// +# define LIBCOMMON_SYMEXPORT // Using static or shared. +//# error define LIBCOMMON_STATIC or LIBCOMMON_SHARED preprocessor macro to signal libcommon library type being linked +#endif |