Reland "Add RTC_EXPORT macro to export WebRTC symbols."
This is a reland of 55daf1aef65218a97eff88999e5190a2f2f6b72e.
In order to avoid problems on case insensitive file systems this CL
moves rtc_export.h to rtc_base/system (avoiding problems with build/).
Diff: https://webrtc-review.googlesource.com/c/src/+/100804/1..2.
Original change's description:
> Add RTC_EXPORT macro to export WebRTC symbols.
>
> This CL introduces the utility macro RTC_EXPORT which will let WebRTC
> developers decide which symbols are supposed to be exported/imported
> and which ones are private.
>
> RTC_EXPORT will only export/import symbols in a component build, more
> info: https://cs.chromium.org/chromium/src/docs/component_build.md.
> During a component build, the macro COMPONENT_BUILD will be globally
> defined in a consistent fashion so it is safe to rely on it to
> understand how to expand RTC_EXPORT.
> In a non component build, RTC_EXPORT will expand to nothing.
>
> Bug: webrtc:9419
> Change-Id: Ic58162783be7f5883136ade27f324d6d34fdf932
> Reviewed-on: https://webrtc-review.googlesource.com/97960
> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
> Reviewed-by: Niels Moller <nisse@webrtc.org>
> Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
> Reviewed-by: Yves Gerey <yvesg@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#24757}
Bug: webrtc:9419
Change-Id: Icfedea5fc3416ea1af2185de443fa879fb2dee8b
Reviewed-on: https://webrtc-review.googlesource.com/100804
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24766}diff --git a/BUILD.gn b/BUILD.gn
index 418408b..3f06fa9 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -83,12 +83,21 @@
}
}
+config("library_impl_config") {
+ # Build targets that contain WebRTC implementation need this macro to
+ # be defined in order to correctly export symbols when is_component_build
+ # is true.
+ # For more info see: rtc_base/build/rtc_export.h.
+ defines = [ "WEBRTC_LIBRARY_IMPL" ]
+}
+
# Contains the defines and includes in common.gypi that are duplicated both as
# target_defaults and direct_dependent_settings.
config("common_inherited_config") {
defines = []
cflags = []
ldflags = []
+
if (build_with_mozilla) {
defines += [ "WEBRTC_MOZILLA_BUILD" ]
}