Backport patch to fix FTBFS with GCC on aarch64 from upstream Chromium

qt5-qtwebengine.spec

@@ -103,6 +103,9 @@ Patch21: qtwebengine-opensource-src-5.9.0-gn-bootstrap-verbose.patch
 # Backport upstream patch to fix GN FTBFS on aarch64 (QTBUG-61128)
 # https://codereview.qt-project.org/196178
 Patch100: qtwebengine-opensource-src-5.9.0-gn-aarch64.patch
+# Backport patch to fix FTBFS with GCC on aarch64 from upstream Chromium
+# https://codereview.chromium.org/2545053002
+Patch101: qtwebengine-opensource-src-5.9.0-aarch64-gcc-toolchain.patch
 
 %if 0%{?fedora} && 0%{?fedora} < 25
 # work around missing qt5_qtwebengine_arches macro on F24
@@ -348,6 +351,7 @@ BuildArch: noarch
 %patch20 -p1 -b .qt57
 %patch21 -p1 -b .gn-bootstrap-verbose
 %patch100 -p1 -b .gn-aarch64
+%patch101 -p1 -b .aarch64-gcc-toolchain
 # fix // in #include in content/renderer/gpu to avoid debugedit failure
 sed -i -e 's!gpu//!gpu/!g' \
   src/3rdparty/chromium/content/renderer/gpu/compositor_forwarding_message_filter.cc
@@ -562,6 +566,7 @@ done
   upstream, force -g2 on x86_64 instead
 - Force verbose output from the GN bootstrap process
 - Backport upstream patch to fix GN FTBFS on aarch64 (QTBUG-61128)
+- Backport patch to fix FTBFS with GCC on aarch64 from upstream Chromium
 
 * Sat May 13 2017 Rex Dieter <rdieter@fedoraproject.org> - 5.8.0-14
 - fix rpm macros

qtwebengine-opensource-src-5.9.0-aarch64-gcc-toolchain.patch

@@ -0,0 +1,30 @@
+Index: src/3rdparty/chromium/build/toolchain/linux/BUILD.gn
+diff --git a/src/3rdparty/chromium/build/toolchain/linux/BUILD.gn b/src/3rdparty/chromium/build/toolchain/linux/BUILD.gn
+index 548722d3938017ac936b9088b7a686c2afbbb5fe..86cd7dabc6e86d22a266817dfbb3bf0c719f7992 100644
+--- a/src/3rdparty/chromium/build/toolchain/linux/BUILD.gn
++++ b/src/3rdparty/chromium/build/toolchain/linux/BUILD.gn
+@@ -21,6 +21,24 @@ clang_toolchain("clang_arm64") {
+   }
+ }
+ 
++gcc_toolchain("arm64") {
++  toolprefix = "aarch64-linux-gnu-"
++
++  cc = "${toolprefix}gcc"
++  cxx = "${toolprefix}g++"
++
++  ar = "${toolprefix}ar"
++  ld = cxx
++  readelf = "${toolprefix}readelf"
++  nm = "${toolprefix}nm"
++
++  toolchain_args = {
++    current_cpu = "arm64"
++    current_os = "linux"
++    is_clang = false
++  }
++}
++
+ gcc_toolchain("arm") {
+   toolprefix = "arm-linux-gnueabihf-"
+