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gmodule: Add the visibility attribute to G_MODULE_EXPORT on gcc

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For versions of GCC which support it (≥ 4), define G_MODULE_EXPORT as
__attribute__((visibility("default"))). This is normally a no-op, unless
compiling with -fvisibility=hidden, in which case it marks a symbol to
be publicly exported from the library, which is what G_MODULE_EXPORT is
for. Previously G_MODULE_EXPORT has only worked on Windows.

The compatibility check for whether the compiler supports
__attribute__((visibility)) is based on the __GNUC__ define, and is
similar to the check done in configure.ac for defining G_GNUC_INTERNAL.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://bugzilla.gnome.org/show_bug.cgi?id=778287
This commit is contained in:
Philip Withnall 2017-02-13 11:46:59 +00:00
parent 92cb02392c
commit 553329358c
2 changed files with 12 additions and 4 deletions
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12
gmodule/gmodule.c
View File

@ -167,9 +167,15 @@
/**
* G_MODULE_EXPORT:
*
* Used to declare functions exported by modules. This is a no-op on Linux
* and Unices, but when compiling for Windows, it marks a symbol to be
* exported from the library or executable being built.
* Used to declare functions exported by libraries or modules.
*
* When compiling for Windows, it marks the symbol as `dllexport`.
*
* When compiling for Linux and Unices, it marks the symbol as having `default`
* visibility. This is no-op unless the code is being compiled with a
* non-default
* [visibility flag](https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#index-fvisibility-1260)
* such as `hidden`.
*/
/**

4
gmodule/gmodule.h
View File

@ -35,7 +35,9 @@ G_BEGIN_DECLS
#define G_MODULE_IMPORT extern
#ifdef G_PLATFORM_WIN32
# define G_MODULE_EXPORT __declspec(dllexport)
#else /* !G_PLATFORM_WIN32 */
#elif __GNUC__ >= 4
# define G_MODULE_EXPORT __attribute__((visibility("default")))
#else /* !G_PLATFORM_WIN32 && __GNUC__ < 4 */
# define G_MODULE_EXPORT
#endif /* !G_PLATFORM_WIN32 */