build: Add -fvisibility=hidden flag for macOS host

hebasto · hebasto · commit 047d211b18a3 · 2022-02-18T11:24:32.000+02:00
With all benefits of reducing exports, there are no evidences of any
drawback while compiling with clang for macOS. Also, when building with
depends, it is expected that different translation units are being
compiled with the same visibility settings.
diff --git a/depends/hosts/darwin.mk b/depends/hosts/darwin.mk
@@ -109,7 +109,7 @@ darwin_CXX=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
                -Xclang -internal-externc-isystem$(clang_resource_dir)/include \
                -Xclang -internal-externc-isystem$(OSX_SDK)/usr/include
 
-darwin_CFLAGS=-pipe
+darwin_CFLAGS=-pipe -fvisibility=hidden
 darwin_CXXFLAGS=$(darwin_CFLAGS)
 
 darwin_release_CFLAGS=-O2
