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authorBoris Kolpackov <boris@codesynthesis.com>2019-07-08 14:55:35 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2019-07-24 13:53:25 +0200
commit83bb02cada0b894d9134cc5489999e0f0fe8bd7c (patch)
tree1dedff27ce2b7d54bd6b0875c9125f4dafde2e80 /libbuild2/in/export.hxx
parent1ba934bb973c234b68751ee5866365c14da4e795 (diff)
Move in build system module to separate library
Diffstat (limited to 'libbuild2/in/export.hxx')
-rw-r--r--libbuild2/in/export.hxx34
1 files changed, 34 insertions, 0 deletions
diff --git a/libbuild2/in/export.hxx b/libbuild2/in/export.hxx
new file mode 100644
index 0000000..47909e7
--- /dev/null
+++ b/libbuild2/in/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_IN_STATIC) // Using static.
+# define LIBBUILD2_IN_SYMEXPORT
+#elif defined(LIBBUILD2_IN_STATIC_BUILD) // Building static.
+# define LIBBUILD2_IN_SYMEXPORT
+#elif defined(LIBBUILD2_IN_SHARED) // Using shared.
+# ifdef _WIN32
+# define LIBBUILD2_IN_SYMEXPORT __declspec(dllimport)
+# else
+# define LIBBUILD2_IN_SYMEXPORT
+# endif
+#elif defined(LIBBUILD2_IN_SHARED_BUILD) // Building shared.
+# ifdef _WIN32
+# define LIBBUILD2_IN_SYMEXPORT __declspec(dllexport)
+# else
+# define LIBBUILD2_IN_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_IN_SYMEXPORT // Using static or shared.
+#endif