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mingw: Define PGDLLEXPORT as __declspec (dllexport) as done for msvc

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While mingw would otherwise fall back to
__attribute__((visibility("default"))), that appears to only work as long as
no symbols are declared with __declspec(dllexport). But we can end up with
some, e.g. plpython's Py_Init.

It's quite possible we should do the same for cygwin, but I don't have a test
environment for that...

Discussion: http://postgr.es/m/20220928022724.erzuk5v4ai4b53do@awork3.anarazel.de
Discussion: http://postgr.es/m/20220928025242.ugf7t5ugxxgmkraa@awork3.anarazel.de
This commit is contained in:
Andres Freund 2022-09-28 10:16:49 -07:00
parent 4e4f7b9fcc
commit 0e497eadb1
1 changed files with 6 additions and 4 deletions
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10
src/include/port/win32.h
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@ -49,9 +49,11 @@
#endif
/*
* Under MSVC, functions exported by a loadable module must be marked
* "dllexport". Other compilers don't need that.
* Functions exported by a loadable module must be marked "dllexport".
*
* While mingw would otherwise fall back to
* __attribute__((visibility("default"))), that appears to only work as long
* as no symbols are declared with __declspec(dllexport). But we can end up
* with some, e.g. plpython's Py_Init.
*/
#ifdef _MSC_VER
#define PGDLLEXPORT __declspec (dllexport)
#endif