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gstconfig.h: add GST_API_IMPORT define

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This is for use by the various GST_*_API decorators and
will be what they get defined to when a library API is being
used by external users of that library (not the library itself
whilst it's being compiled).

In most cases it will simply map to a plain 'extern' but on
Windows with MSVC it will need to map to __declspec(dllimport).
For functions this is not strictly needed, but for exported
variables it is.

https://bugzilla.gnome.org/show_bug.cgi?id=797185
This commit is contained in:
Tim-Philipp Müller 2018-08-25 22:53:07 +02:00
parent 54e498f2d5
commit 50038bed79
1 changed files with 6 additions and 0 deletions
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6
gst/gstconfig.h.in
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@ -155,6 +155,12 @@
# endif
#endif
#if defined(_MSC_VER) && !defined(GST_STATIC_COMPILATION)
# define GST_API_IMPORT __declspec(dllimport) extern
#else
# define GST_API_IMPORT extern
#endif
#ifndef GST_API
#define GST_API GST_EXPORT
#endif