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authorKaren Arutyunov <karen@codesynthesis.com>2019-08-01 16:10:48 +0300
committerKaren Arutyunov <karen@codesynthesis.com>2019-08-01 16:41:08 +0300
commitda9cbf29c403d27c2940f9b31199c4648f8ae4a1 (patch)
tree9732de6f48bdaead2becf32be41b1284e1e83e00 /libbuild2/version/export.hxx
parent8e69e09b7ec68377758c63092f9b254e95a0d7be (diff)
Move version build system module to separate library
Diffstat (limited to 'libbuild2/version/export.hxx')
-rw-r--r--libbuild2/version/export.hxx34
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