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Diffstat (limited to 'libbuild2/version/export.hxx')
| -rw-r--r-- | libbuild2/version/export.hxx | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/libbuild2/version/export.hxx b/libbuild2/version/export.hxx new file mode 100644 index 0000000..c76cd8a --- /dev/null +++ b/libbuild2/version/export.hxx @@ -0,0 +1,34 @@ +#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(LIBBUILD2_VERSION_STATIC) // Using static. +# define LIBBUILD2_VERSION_SYMEXPORT +#elif defined(LIBBUILD2_VERSION_STATIC_BUILD) // Building static. +# define LIBBUILD2_VERSION_SYMEXPORT +#elif defined(LIBBUILD2_VERSION_SHARED) // Using shared. +# ifdef _WIN32 +# define LIBBUILD2_VERSION_SYMEXPORT __declspec(dllimport) +# else +# define LIBBUILD2_VERSION_SYMEXPORT +# endif +#elif defined(LIBBUILD2_VERSION_SHARED_BUILD) // Building shared. +# ifdef _WIN32 +# define LIBBUILD2_VERSION_SYMEXPORT __declspec(dllexport) +# else +# define LIBBUILD2_VERSION_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 but in case +// of shared will be sub-optimal compared to having dllimport. +// +# define LIBBUILD2_VERSION_SYMEXPORT // Using static or shared. +#endif |