Allow building against system-wide harfbuzz.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=847568
---
 config/system-headers.mozbuild  | 7 +++++++
 dom/base/moz.build              | 3 +++
 gfx/moz.build                   | 4 +++-
 gfx/skia/generate_mozbuild.py   | 3 +++
 gfx/skia/moz.build              | 3 +++
 gfx/thebes/moz.build            | 3 +++
 intl/unicharutil/util/moz.build | 3 +++
 netwerk/dns/moz.build           | 3 +++
 toolkit/library/moz.build       | 3 +++
 toolkit/moz.configure           | 9 +++++++++
 10 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/config/system-headers.mozbuild b/config/system-headers.mozbuild
index ae0c9d6d7c..44d08cf06b 100644
--- a/config/system-headers.mozbuild
+++ b/config/system-headers.mozbuild
@@ -1237,6 +1237,13 @@ if CONFIG['OS_TARGET'] == 'Android':
         'vr/gvr/capi/include/gvr.h',
     ]
 
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    system_headers += [
+	'harfbuzz/hb-glib.h',
+	'harfbuzz/hb-ot.h',
+	'harfbuzz/hb.h',
+    ]
+
 if CONFIG['MOZ_JACK']:
     system_headers += [
         'jack/jack.h',
diff --git a/dom/base/moz.build b/dom/base/moz.build
index d390adfc49..4508f19cb6 100644
--- a/dom/base/moz.build
+++ b/dom/base/moz.build
@@ -567,6 +567,9 @@ FINAL_LIBRARY = "xul"
 if CONFIG["MOZ_X11"]:
     CXXFLAGS += CONFIG["TK_CFLAGS"]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 GeneratedFile(
     "UseCounterList.h",
     script="gen-usecounters.py",
diff --git a/gfx/moz.build b/gfx/moz.build
index 4d6d63da9d..8222b72333 100644
--- a/gfx/moz.build
+++ b/gfx/moz.build
@@ -10,6 +10,9 @@ with Files("**"):
 with Files("wr/**"):
     BUG_COMPONENT = ("Core", "Graphics: WebRender")
 
+if not CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    DIRS += ["harfbuzz/src"]
+
 DIRS += [
     "cairo",
     "2d",
@@ -20,7 +23,6 @@ DIRS += [
     "gl",
     "layers",
     "graphite2/src",
-    "harfbuzz/src",
     "ots/src",
     "thebes",
     "ipc",
diff --git a/gfx/skia/generate_mozbuild.py b/gfx/skia/generate_mozbuild.py
index 5e0fd17d79..860b80af4f 100755
--- a/gfx/skia/generate_mozbuild.py
+++ b/gfx/skia/generate_mozbuild.py
@@ -96,6 +96,9 @@ if CONFIG['CC_TYPE'] in ('clang', 'clang-cl'):
         '-Wno-unused-private-field',
     ]
 
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    CXXFLAGS += CONFIG['MOZ_HARFBUZZ_CFLAGS']
+
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk', 'android'):
     LOCAL_INCLUDES += [
         "/gfx/cairo/cairo/src",
diff --git a/gfx/skia/moz.build b/gfx/skia/moz.build
index 524bd28dac..615c93b266 100755
--- a/gfx/skia/moz.build
+++ b/gfx/skia/moz.build
@@ -488,6 +488,9 @@ if CONFIG['CC_TYPE'] in ('clang', 'clang-cl'):
         '-Wno-unused-private-field',
     ]
 
+if CONFIG['MOZ_SYSTEM_HARFBUZZ']:
+    CXXFLAGS += CONFIG['MOZ_HARFBUZZ_CFLAGS']
+
 if CONFIG['MOZ_WIDGET_TOOLKIT'] in ('gtk', 'android'):
     LOCAL_INCLUDES += [
         "/gfx/cairo/cairo/src",
diff --git a/gfx/thebes/moz.build b/gfx/thebes/moz.build
index baa6f090a9..c51c36e2b4 100644
--- a/gfx/thebes/moz.build
+++ b/gfx/thebes/moz.build
@@ -294,6 +294,9 @@

 DEFINES["GRAPHITE2_STATIC"] = True

+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 CXXFLAGS += ["-Werror=switch"]

 include("/tools/fuzzing/libfuzzer-config.mozbuild")
diff --git a/intl/unicharutil/util/moz.build b/intl/unicharutil/util/moz.build
index 301eb9a854..7cece5e06c 100644
--- a/intl/unicharutil/util/moz.build
+++ b/intl/unicharutil/util/moz.build
@@ -25,6 +25,9 @@ UNIFIED_SOURCES += [
     "nsUnicodeProperties.cpp",
 ]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 include("/ipc/chromium/chromium-config.mozbuild")
 
 GeneratedFile(
diff --git a/netwerk/dns/moz.build b/netwerk/dns/moz.build
index f769e270fa..8f64710257 100644
--- a/netwerk/dns/moz.build
+++ b/netwerk/dns/moz.build
@@ -109,4 +109,7 @@ LOCAL_INCLUDES += [
     "/netwerk/protocol/http",
 ]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    CXXFLAGS += CONFIG["MOZ_HARFBUZZ_CFLAGS"]
+
 USE_LIBS += ["icu"]
diff --git a/toolkit/library/moz.build b/toolkit/library/moz.build
index 2c3f86948e..dd6901ba9a 100644
--- a/toolkit/library/moz.build
+++ b/toolkit/library/moz.build
@@ -260,6 +260,9 @@ if CONFIG["MOZ_ANDROID_GOOGLE_VR"]:
         "-lgvr",
     ]
 
+if CONFIG["MOZ_SYSTEM_HARFBUZZ"]:
+    OS_LIBS += CONFIG["MOZ_HARFBUZZ_LIBS"]
+
 if CONFIG["MOZ_SYSTEM_JPEG"]:
     OS_LIBS += CONFIG["MOZ_JPEG_LIBS"]
 
diff --git a/toolkit/moz.configure b/toolkit/moz.configure
index 00698656f6..1843188d11 100644
--- a/toolkit/moz.configure
+++ b/toolkit/moz.configure
@@ -460,6 +460,15 @@ add_old_configure_assignment(
 )
 set_define("MOZ_HAVE_FREETYPE2", depends_if(freetype2_info)(lambda _: True))
 
+# HarfBuzz
+# ==============================================================
+option('--with-system-harfbuzz', help="Use system harfbuzz (located with pkgconfig)")
+
+system_harfbuzz = pkg_check_modules('MOZ_HARFBUZZ', 'harfbuzz >= 2.7.4',
+                                    when='--with-system-harfbuzz')
+
+set_config('MOZ_SYSTEM_HARFBUZZ', depends_if(system_harfbuzz)(lambda _: True))
+
 # Apple platform decoder support
 # ==============================================================
 @depends(toolkit)
-- 
2.34.1