[Buildroot] [PATCH 1/2] package/gtest: gmock needs host gcc >= 4.9

[Fabrice Fontaine]

gtest unconditionally uses is_trivially_copy_constructible since
version 1.11.0 and
https://github.com/google/googletest/commit/c13c27a513ecd1cbf5700a45fe590e85e8ae6770

So add a dependency on host gcc >= 4.9 for gmock to avoid the following
build failure since commit 9dfbbbb4105c47602da048c9bb9499fb8862e768:

In file included from /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/host-gtest-1.11.0/googletest/include/gtest/internal/gtest-death-test-internal.h:39:0,
                 from /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/host-gtest-1.11.0/googletest/include/gtest/gtest-death-test.h:41,
                 from /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/host-gtest-1.11.0/googletest/include/gtest/gtest.h:64,
                 from /usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/host-gtest-1.11.0/googletest/src/gtest-all.cc:38:
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/host-gtest-1.11.0/googletest/include/gtest/gtest-matchers.h: In static member function 'static constexpr bool testing::internal::MatcherBase<T>::IsInlined()':
/usr/lfs/hdd_v1/rc-buildroot-test/scripts/instance-1/output-1/build/host-gtest-1.11.0/googletest/include/gtest/gtest-matchers.h:414:12: error: 'is_trivially_copy_constructible' is not a member of 'std'
            std::is_trivially_copy_constructible<M>::value &&
            ^

Fixes:
 - http://autobuild.buildroot.org/results/9d19a47deb80824eaa718d80f14b0afd5f9eb054

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
---
 package/gtest/Config.in | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/gtest/Config.in b/package/gtest/Config.in
index d8bcf6343f..35fc9fea7b 100644
--- a/package/gtest/Config.in
+++ b/package/gtest/Config.in
@@ -26,6 +26,7 @@ if BR2_PACKAGE_GTEST
 
 config BR2_PACKAGE_GTEST_GMOCK
 	bool "gmock"
+	depends on BR2_HOST_GCC_AT_LEAST_4_9 # host-gtest
 	help
 	  Inspired by jMock, EasyMock, and Hamcrest, and designed with
 	  C++'s specifics in mind, Google C++ Mocking Framework (or
@@ -47,6 +48,9 @@ config BR2_PACKAGE_GTEST_GMOCK
 	  libraries required to link/run them. The host package installs
 	  gmock_gen, a Python script used to generate code mocks.
 
+comment "gmock needs host gcc >= 4.9"
+	depends on !BR2_HOST_GCC_AT_LEAST_4_9
+
 endif # BR2_PACKAGE_GTEST
 
 comment "gtest needs a toolchain w/ C++, wchar, threads, gcc >= 4.9"
-- 
2.35.1