build: add options to configure libsrtp for boringssl or other libraries

Depends on
  https://webrtc-review.googlesource.com/c/src/+/359928

BUG=webrtc:42234521,webrtc:42224104

Change-Id: I0d6335aa5fb3f090c781bed234ed34d6c98ec299
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/359928
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@meta.com>
Cr-Commit-Position: refs/heads/main@{#42857}

BUILD.gn

@@ -512,6 +512,18 @@ config("common_objc") {
   frameworks = [ "Foundation.framework" ]
 }
 
+if (!rtc_build_ssl) {
+  config("external_ssl_library") {
+    if (rtc_ssl_root != "") {
+      include_dirs = [ rtc_ssl_root ]
+    }
+    libs = [
+      "crypto",
+      "ssl",
+    ]
+  }
+}
+
 if (!build_with_chromium) {
   # Target to build all the WebRTC production code.
   rtc_static_library("webrtc") {

build_overrides/build.gni

@@ -12,7 +12,7 @@ enable_java_templates = true
 # Enables assertions on safety checks in libc++.
 enable_safe_libcxx = true
 
-# Don't set this variable to true when building stadalone WebRTC, it is
+# Don't set this variable to true when building standalone WebRTC, it is
 # only needed to support both WebRTC standalone and Chromium builds.
 build_with_chromium = false
 

pc/BUILD.gn

@@ -34,6 +34,13 @@ if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
+if (rtc_build_libsrtp) {
+  import("//third_party/libsrtp/options.gni")
+  assert(rtc_build_ssl == libsrtp_build_boringssl,
+         "Mismatch ssl build settings detected")
+  assert(rtc_ssl_root == libsrtp_ssl_root, "Mismatch in ssl root detected")
+}
+
 group("pc") {
   deps = [ ":rtc_pc" ]
 }
@@ -178,6 +185,10 @@ rtc_source_set("external_hmac") {
   ]
   if (rtc_build_libsrtp) {
     deps += [ "//third_party/libsrtp" ]
+    configs = []
+    if (!rtc_build_ssl) {
+      configs += [ "..:external_ssl_library" ]
+    }
   }
 }
 
@@ -613,6 +624,10 @@ rtc_source_set("srtp_session") {
   ]
   if (rtc_build_libsrtp) {
     deps += [ "//third_party/libsrtp" ]
+    configs = []
+    if (!rtc_build_ssl) {
+      configs += [ "..:external_ssl_library" ]
+    }
   }
 }
 rtc_source_set("srtp_transport") {
@@ -1991,8 +2006,6 @@ if (rtc_include_tests && !build_with_chromium) {
       "video_rtp_receiver_unittest.cc",
     ]
 
-    include_dirs = [ "//third_party/libsrtp/srtp" ]
-
     if (is_win) {
       libs = [ "strmiids.lib" ]
     }
@@ -2100,8 +2113,14 @@ if (rtc_include_tests && !build_with_chromium) {
       "//third_party/abseil-cpp/absl/types:optional",
     ]
 
+    include_dirs = []
+    configs = []
     if (rtc_build_libsrtp) {
+      include_dirs += [ "//third_party/libsrtp/srtp" ]
       deps += [ "//third_party/libsrtp" ]
+      if (!rtc_build_ssl) {
+        configs += [ "..:external_ssl_library" ]
+      }
     }
 
     if (is_android) {

rtc_base/BUILD.gn

@@ -13,18 +13,6 @@ if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
-if (!rtc_build_ssl) {
-  config("external_ssl_library") {
-    if (rtc_ssl_root != "") {
-      include_dirs = [ rtc_ssl_root ]
-    }
-    libs = [
-      "crypto",
-      "ssl",
-    ]
-  }
-}
-
 rtc_source_set("protobuf_utils") {
   sources = [ "protobuf_utils.h" ]
   if (rtc_enable_protobuf) {
@@ -1504,7 +1492,7 @@ rtc_source_set("digest") {
   if (rtc_build_ssl) {
     deps += [ "//third_party/boringssl" ]
   } else {
-    configs += [ ":external_ssl_library" ]
+    configs += [ "..:external_ssl_library" ]
   }
 }
 
@@ -1526,7 +1514,7 @@ rtc_library("crypto_random") {
   if (rtc_build_ssl) {
     deps += [ "//third_party/boringssl" ]
   } else {
-    configs += [ ":external_ssl_library" ]
+    configs += [ "..:external_ssl_library" ]
   }
 }
 
@@ -1591,7 +1579,7 @@ rtc_library("ssl") {
     ]
     deps += [ ":crypto_random" ]
 
-    configs += [ ":external_ssl_library" ]
+    configs += [ "..:external_ssl_library" ]
   }
 
   if (build_with_chromium) {
@@ -1653,7 +1641,7 @@ rtc_library("ssl_adapter") {
   if (rtc_build_ssl) {
     deps += [ "//third_party/boringssl" ]
   } else {
-    configs += [ ":external_ssl_library" ]
+    configs += [ "..:external_ssl_library" ]
   }
 }
 
@@ -2211,7 +2199,7 @@ if (rtc_include_tests) {
       if (rtc_build_ssl) {
         deps += [ "//third_party/boringssl" ]
       } else {
-        configs += [ ":external_ssl_library" ]
+        configs += [ "..:external_ssl_library" ]
       }
     }
   }