[libgweather] build: Non-MSVC compilers support declspec extern

[Emmanuele Bassi <ebassi src gnome org>]

commit 02e3d9eff426dc660b23e6c9b165410fe02359e9
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Nov 27 13:45:11 2017 +0000

    build: Non-MSVC compilers support declspec extern
    
    This was cargo-culted from the Autotools build of other projects, but
    GCC and Clang support the same syntax as MSVC for externally visible
    symbols. The only thing that is GCC-specific is the compiler argument,
    as MSVC automatically marks all symbols as hidden.

 meson.build |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/meson.build b/meson.build
index 9a22630..64be305 100644
--- a/meson.build
+++ b/meson.build
@@ -72,10 +72,8 @@ config_h.set_quoted('OWM_APIKEY', get_option('owm_apikey'))
 if get_option('default_library') != 'static'
   if host_machine.system() == 'windows'
     config_h.set('DLL_EXPORT', true)
-    if cc.get_id() == 'msvc'
-      config_h.set('GWEATHER_EXTERN', '__declspec(dllexport) extern')
-    else
-      config_h.set('GWEATHER_EXTERN', '__attribute__((visibility("default"))) __declspec(dllexport) extern')
+    config_h.set('GWEATHER_EXTERN', '__declspec(dllexport) extern')
+    if cc.get_id() != 'msvc'
       add_global_arguments(['-fvisibility=hidden'], language: 'c')
     endif
   else