# HG changeset patch
# User Wolfgang Rosenauer <wr@rosenauer.org>
# Parent  066aba2f6d1fbc0fe31d1864d539714041404fe6

diff --git a/build/moz.configure/lto-pgo.configure b/build/moz.configure/lto-pgo.configure
--- a/build/moz.configure/lto-pgo.configure
+++ b/build/moz.configure/lto-pgo.configure
@@ -243,34 +243,34 @@ def lto(
             "configure."
         )
 
     if c_compiler.type == "clang":
         if value == "full":
             cflags.append("-flto")
             ldflags.append("-flto")
         else:
-            cflags.append("-flto=thin")
-            ldflags.append("-flto=thin")
+            cflags.append("-flto")
+            ldflags.append("-flto")
 
         if target.os == "Android" and value == "cross":
             # Work around https://github.com/rust-lang/rust/issues/90088
             # by enabling the highest level of SSE the rust targets default
             # to.
             # https://github.com/rust-lang/rust/blob/bdfcb88e8b6203ccb46a2fb6649979b773efc8ac/compiler/rustc_target/src/spec/i686_linux_android.rs#L13
             # https://github.com/rust-lang/rust/blob/8d1083e319841624f64400e1524805a40d725439/compiler/rustc_target/src/spec/x86_64_linux_android.rs#L7
             if target.cpu == "x86":
                 ldflags.append("-Wl,-plugin-opt=-mattr=+ssse3")
             elif target.cpu == "x86_64":
                 ldflags.append("-Wl,-plugin-opt=-mattr=+sse4.2")
     elif c_compiler.type == "clang-cl":
         if value == "full":
             cflags.append("-flto")
         else:
-            cflags.append("-flto=thin")
+            cflags.append("-flto")
         # With clang-cl, -flto can only be used with -c or -fuse-ld=lld.
         # AC_TRY_LINKs during configure don't have -c, so pass -fuse-ld=lld.
         cflags.append("-fuse-ld=lld")
 
         # Explicitly set the CPU to optimize for so the linker doesn't
         # choose a poor default.  Rust compilation by default uses the
         # pentium4 CPU on x86:
         #
diff --git a/build/pgo/profileserver.py b/build/pgo/profileserver.py
--- a/build/pgo/profileserver.py
+++ b/build/pgo/profileserver.py
@@ -6,17 +6,17 @@
 
 import json
 import os
 import sys
 import glob
 import subprocess
 
 import mozcrash
-from mozbuild.base import MozbuildObject, BinaryNotFoundException
+from mozbuild.base import MozbuildObject, BinaryNotFoundException, BuildEnvironmentNotFoundException
 from mozfile import TemporaryDirectory
 from mozhttpd import MozHttpd
 from mozprofile import FirefoxProfile, Preferences
 from mozprofile.permissions import ServerLocations
 from mozrunner import FirefoxRunner, CLI
 from six import string_types
 
 PORT = 8888
@@ -82,19 +82,32 @@ if __name__ == "__main__":
         docroot=os.path.join(build.topsrcdir, "build", "pgo"),
         path_mappings=path_mappings,
     )
     httpd.start(block=False)
 
     locations = ServerLocations()
     locations.add_host(host="127.0.0.1", port=PORT, options="primary,privileged")
 
-    old_profraw_files = glob.glob("*.profraw")
-    for f in old_profraw_files:
-        os.remove(f)
+    using_gcc = False
+    try:
+        if build.config_environment.substs.get('CC_TYPE') == 'gcc':
+            using_gcc = True
+    except BuildEnvironmentNotFoundException:
+        pass
+
+    if using_gcc:
+        for dirpath, _, filenames in os.walk('.'):
+            for f in filenames:
+                if f.endswith('.gcda'):
+                    os.remove(os.path.join(dirpath, f))
+    else:
+        old_profraw_files = glob.glob('*.profraw')
+        for f in old_profraw_files:
+            os.remove(f)
 
     with TemporaryDirectory() as profilePath:
         # TODO: refactor this into mozprofile
         profile_data_dir = os.path.join(build.topsrcdir, "testing", "profiles")
         with open(os.path.join(profile_data_dir, "profiles.json"), "r") as fh:
             base_profiles = json.load(fh)["profileserver"]
 
         prefpaths = [
@@ -207,16 +220,20 @@ if __name__ == "__main__":
 
         # Try to move the crash reports to the artifacts even if Firefox appears
         # to exit successfully, in case there's a crash that doesn't set the
         # return code to non-zero for some reason.
         if get_crashreports(profilePath, name="Firefox exited successfully?") != 0:
             print("Firefox exited successfully, but produced a crashreport")
             sys.exit(1)
 
+        print('Copying profile data....')
+        os.system('pwd');
+        os.system('tar cf profdata.tar.gz `find . -name "*.gcda"`; cd ..; tar xf instrumented/profdata.tar.gz;');
+
         llvm_profdata = env.get("LLVM_PROFDATA")
         if llvm_profdata:
             profraw_files = glob.glob("*.profraw")
             if not profraw_files:
                 print(
                     "Could not find profraw files in the current directory: %s"
                     % os.getcwd()
                 )
diff --git a/build/unix/mozconfig.unix b/build/unix/mozconfig.unix
--- a/build/unix/mozconfig.unix
+++ b/build/unix/mozconfig.unix
@@ -1,14 +1,23 @@
 . "$topsrcdir/build/mozconfig.common"
 
 if [ -n "$FORCE_GCC" ]; then
     CC="$MOZ_FETCHES_DIR/gcc/bin/gcc"
     CXX="$MOZ_FETCHES_DIR/gcc/bin/g++"
 
+    if [ -n "$MOZ_PGO" ]; then
+        if [ -z "$USE_ARTIFACT" ]; then
+            ac_add_options --enable-lto
+	fi
+	export AR="$topsrcdir/gcc/bin/gcc-ar"
+        export NM="$topsrcdir/gcc/bin/gcc-nm"
+        export RANLIB="$topsrcdir/gcc/bin/gcc-ranlib"
+    fi
+
     # We want to make sure we use binutils and other binaries in the tooltool
     # package.
     mk_add_options "export PATH=$MOZ_FETCHES_DIR/gcc/bin:$PATH"
 else
     # For some builds we don't want to have Clang based static-analysis activated
     if [ -z "$DISABLE_CLANG_PLUGIN" ]; then
         export ENABLE_CLANG_PLUGIN=1
     fi
diff --git a/extensions/spellcheck/src/moz.build b/extensions/spellcheck/src/moz.build
--- a/extensions/spellcheck/src/moz.build
+++ b/extensions/spellcheck/src/moz.build
@@ -26,8 +26,10 @@ LOCAL_INCLUDES += [
 ]
 EXPORTS.mozilla += [
     "mozInlineSpellChecker.h",
     "mozSpellChecker.h",
 ]
 
 if CONFIG["CC_TYPE"] in ("clang", "gcc"):
     CXXFLAGS += ["-Wno-error=shadow"]
+
+CXXFLAGS += ['-fno-devirtualize']
diff --git a/toolkit/components/terminator/nsTerminator.cpp b/toolkit/components/terminator/nsTerminator.cpp
--- a/toolkit/components/terminator/nsTerminator.cpp
+++ b/toolkit/components/terminator/nsTerminator.cpp
@@ -461,16 +461,21 @@ void nsTerminator::StartWatchdog() {
       // Defend against overflow
       crashAfterMS = INT32_MAX;
     } else {
       crashAfterMS *= scaleUp;
     }
   }
 #endif
 
+  // Disable watchdog for PGO train builds - writting profile information at
+  // exit may take time and it is better to make build hang rather than
+  // silently produce poorly performing binary.
+  crashAfterMS = INT32_MAX;
+
   UniquePtr<Options> options(new Options());
   const PRIntervalTime ticksDuration =
       PR_MillisecondsToInterval(HEARTBEAT_INTERVAL_MS);
   options->crashAfterTicks = crashAfterMS / ticksDuration;
   // Handle systems where ticksDuration is greater than crashAfterMS.
   if (options->crashAfterTicks == 0) {
     options->crashAfterTicks = crashAfterMS / HEARTBEAT_INTERVAL_MS;
   }