package/llvm: needs host gcc >= 5

Fix the following build failure with host-lld, libclc, etc. raised since
bump to version 11.1.0 in commit
456f704e6b7be147c504d53a78536938f088e8e8:

CMake Error at cmake/modules/CheckCompilerVersion.cmake:38 (message):
  Host GCC version must be at least 5.1, your version is 4.8.5.

Fixes:
 - http://autobuild.buildroot.org/results/7f120dbcbd5410477550fa8645e7d1cb0ae6cf1c
 - http://autobuild.buildroot.org/results/2382d7112618236aeafcaf581dc22a8d938824cf

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/clang/Config.in

@@ -7,6 +7,7 @@ config BR2_PACKAGE_CLANG
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # std::shared_future
 	depends on !BR2_STATIC_LIBS
 	depends on BR2_USE_WCHAR # std::wstring
+	depends on BR2_HOST_GCC_AT_LEAST_5
 	select BR2_PACKAGE_LLVM
 	help
 	  Clang is a C/C++, Objective C/C++ and OpenCL C front-end
@@ -14,11 +15,12 @@ config BR2_PACKAGE_CLANG
 
 	  http://clang.llvm.org
 
-comment "clang needs a toolchain w/ wchar, threads, C++, gcc >= 5, dynamic library"
+comment "clang needs a toolchain w/ wchar, threads, C++, gcc >= 5, dynamic library, host gcc >= 5"
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP || \
 		!BR2_TOOLCHAIN_GCC_AT_LEAST_5 \
-		|| BR2_STATIC_LIBS || !BR2_USE_WCHAR
+		|| BR2_STATIC_LIBS || !BR2_USE_WCHAR \
+		|| !BR2_HOST_GCC_AT_LEAST_5
 
 comment "clang needs a toolchain not affected by GCC bug 64735"
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS

package/compiler-rt/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_COMPILER_RT
 	bool "compiler-rt"
 	depends on BR2_PACKAGE_LLVM
 	depends on BR2_TOOLCHAIN_USES_GLIBC # asan lib requires
+	depends on BR2_HOST_GCC_AT_LEAST_5 # host-clang
 	help
 	  A collection of runtime libraries primarily used by clang and
 	  llvm to provide builtins, sanitizer runtimes, and profiling
@@ -9,6 +10,6 @@ config BR2_PACKAGE_COMPILER_RT
 
 	  https://compiler-rt.llvm.org/
 
-comment "compiler-rt requires llvm to be enabled and a glibc toolchain"
+comment "compiler-rt requires llvm to be enabled, a glibc toolchain, host gcc >= 5"
 	depends on !BR2_PACKAGE_LLVM
-	depends on !BR2_TOOLCHAIN_USES_GLIBC
+	depends on !BR2_TOOLCHAIN_USES_GLIBC ||	!BR2_HOST_GCC_AT_LEAST_5

package/libclc/Config.in

@@ -1,9 +1,14 @@
 config BR2_PACKAGE_LIBCLC
 	bool "libclc"
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on BR2_HOST_GCC_AT_LEAST_5 # host-llvm
 	help
 	  libclc is an open source, BSD licensed implementation of
 	  the library requirements of the OpenCL C programming language,
 	  as specified by the OpenCL 1.1 Specification.
 
 	  http://libclc.llvm.org/
+
+comment "libclc needs host gcc >= 5"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on !BR2_HOST_GCC_AT_LEAST_5

package/lld/Config.in.host

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_HOST_LLD
 	bool "host lld"
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS # llvm
+	depends on BR2_HOST_GCC_AT_LEAST_5 # host-llvm
 	help
 	  LLD is a linker from the LLVM project that is a drop-in
 	  replacement for system linkers, and runs much faster than
@@ -8,3 +9,7 @@ config BR2_PACKAGE_HOST_LLD
 	  toolchain developers.
 
 	  https://lld.llvm.org/
+
+comment "host lld needs host gcc >= 5"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on !BR2_HOST_GCC_AT_LEAST_5

package/llvm/Config.in

@@ -23,6 +23,7 @@ config BR2_PACKAGE_LLVM
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # std::shared_future
 	depends on !BR2_STATIC_LIBS
 	depends on BR2_USE_WCHAR # std::wstring
+	depends on BR2_HOST_GCC_AT_LEAST_5 # host-llvm
 	help
 	  The LLVM Project is a collection of modular and reusable
 	  compiler and toolchain technologies.
@@ -58,11 +59,12 @@ config BR2_PACKAGE_LLVM_BPF
 
 endif
 
-comment "llvm needs a toolchain w/ wchar, threads, C++, gcc >= 5, dynamic library"
+comment "llvm needs a toolchain w/ wchar, threads, C++, gcc >= 5, dynamic library, host gcc >= 5"
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP || \
 		!BR2_TOOLCHAIN_GCC_AT_LEAST_5 \
-		|| BR2_STATIC_LIBS || !BR2_USE_WCHAR
+		|| BR2_STATIC_LIBS || !BR2_USE_WCHAR \
+		|| !BR2_HOST_GCC_AT_LEAST_5
 
 comment "llvm needs a toolchain not affected by GCC bug 64735"
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS

package/mesa3d/Config.in

@@ -30,13 +30,15 @@ config BR2_PACKAGE_MESA3D_LLVM
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # std::shared_future
 	depends on !BR2_STATIC_LIBS
 	depends on BR2_USE_WCHAR # std::wstring
+	depends on BR2_HOST_GCC_AT_LEAST_5 # host-llvm
 	select BR2_PACKAGE_LLVM
 
-comment "llvm support needs a toolchain w/ wchar, threads, C++, gcc >= 5, dynamic library"
+comment "llvm support needs a toolchain w/ wchar, threads, C++, gcc >= 5, dynamic library, host gcc >= 5"
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP || \
 		!BR2_TOOLCHAIN_GCC_AT_LEAST_5 \
-		|| BR2_STATIC_LIBS || !BR2_USE_WCHAR
+		|| BR2_STATIC_LIBS || !BR2_USE_WCHAR \
+		|| !BR2_HOST_GCC_AT_LEAST_5
 
 comment "llvm support needs a toolchain not affected by GCC bug 64735"
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS

package/qt5/qt5tools/Config.in

@@ -23,12 +23,13 @@ config BR2_PACKAGE_QT5TOOLS_QDOC_TOOL
 	# currently supported in Buildroot, unless the target is
 	# already supported by llvm.
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS # llvm, clang
-	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 # llvm, clang
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5 # llvm, clang
 	depends on BR2_TOOLCHAIN_HAS_THREADS # llvm, clang
 	depends on BR2_INSTALL_LIBSTDCPP # llvm, clang
 	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # llvm, clang
 	depends on !BR2_STATIC_LIBS # llvm, clang
 	depends on BR2_USE_WCHAR # llvm, clang
+	depends on BR2_HOST_GCC_AT_LEAST_5 # llvm, clang
 	help
 	  This option enables the qdoc host tool.