Bug 1518937 - Make dynamic linking for freetype symbols configurable. r=lsalzman

Differential Revision: https://phabricator.services.mozilla.com/D16108

--HG--
extra : moz-landing-system : lando

gfx/wr/webrender/Cargo.toml

@@ -17,6 +17,7 @@ replay = ["webrender_api/deserialize", "ron", "serde"]
 debug_renderer = []
 pathfinder = ["pathfinder_font_renderer", "pathfinder_gfx_utils", "pathfinder_partitioner", "pathfinder_path_utils"]
 serialize_program = ["serde", "webrender_build/serialize_program"]
+no_static_freetype = []
 
 [build-dependencies]
 webrender_build = { version = "0.0.1", path = "../webrender_build" }

gfx/wr/webrender/src/platform/unix/font.rs

@@ -25,7 +25,7 @@ use glyph_rasterizer::{GlyphRasterError, GlyphRasterResult, RasterizedGlyph};
 #[cfg(feature = "pathfinder")]
 use glyph_rasterizer::NativeFontHandleWrapper;
 use internal_types::{FastHashMap, ResourceCacheError};
-#[cfg(not(target_os = "android"))]
+#[cfg(any(not(target_os = "android"), feature = "no_static_freetype"))]
 use libc::{dlsym, RTLD_DEFAULT};
 use libc::free;
 #[cfg(feature = "pathfinder")]
@@ -77,7 +77,7 @@ pub fn unimplemented(error: FT_Error) -> bool {
 }
 
 // Use dlsym to check for symbols. If not available. just return an unimplemented error.
-#[cfg(not(target_os = "android"))]
+#[cfg(any(not(target_os = "android"), feature = "no_static_freetype"))]
 macro_rules! ft_dyn_fn {
     ($func_name:ident($($arg_name:ident:$arg_type:ty),*) -> FT_Error) => {
         #[allow(non_snake_case)]
@@ -100,7 +100,7 @@ macro_rules! ft_dyn_fn {
 }
 
 // On Android, just statically link in the symbols...
-#[cfg(target_os = "android")]
+#[cfg(all(target_os = "android", not(feature = "no_static_freetype")))]
 macro_rules! ft_dyn_fn {
     ($($proto:tt)+) => { extern "C" { fn $($proto)+; } }
 }