shithub: openh264

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ref: 64b2e8a818f1d6ba00c4eb0ce40324ef848e477e
parent: 302c64ee15c07ce967ae7f703c445387734ddb65
author: Tom Anderson <thomasanderson@chromium.org>
date: Fri Jan 5 10:55:20 EST 2018

Allow overriding symbol visibility

This patch adds configurable symbol visibility.  This is useful for projects
that want to do in-tree openh264 builds and not export any symbols, otherwise
they would conflict with the system library's symbols.

Users can pass -DWELS_PRIVATE_EXTERN=:hidden on Linux or
-DWELS_PRIVATE_EXTERN=:private_extern on mac to hide symbols that would have
been exported.

--- a/codec/common/x86/asm_inc.asm

+++ b/codec/common/x86/asm_inc.asm

@@ -485,12 +485,15 @@

 %endmacro

 %macro WELS_EXTERN 1

+    %ifndef WELS_PRIVATE_EXTERN

+        %define WELS_PRIVATE_EXTERN

+    %endif

     ALIGN 16, nop

     %ifdef PREFIX

-        global _%1

+        global _%1 WELS_PRIVATE_EXTERN

         %define %1 _%1

     %else

-        global %1

+        global %1 WELS_PRIVATE_EXTERN

     %endif

     %1:

 %endmacro