mesa3d: properly propagate the dependencies of BR2_PACKAGE_LLVM

We cannot simply select BR2_PACKAGE_LLVM, we need to take into account
all its dependencies. BR2_PACKAGE_LLVM_ARCH_SUPPORTS was already taken
into account, but not the other dependencies.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Acked-by: Valentin Korenblit <valentin.korenblit@smile.fr>
Signed-off-by: Thomas Petazzoni <a class="moz-txt-link-rfc2396E" href="mailto:thomas.petazzoni@bootlin.com">&lt;thomas.petazzoni@bootlin.com&gt;</a></pre>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mesa3d/Config.in

@@ -28,8 +28,22 @@ if BR2_PACKAGE_MESA3D
 config BR2_PACKAGE_MESA3D_LLVM
 	bool "llvm support"
 	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on BR2_HOST_GCC_AT_LEAST_4_8
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735 # std::shared_future
 	select BR2_PACKAGE_LLVM
 
+comment "llvm support needs a toolchain w/ threads, C++, gcc >= 4.8, host gcc >= 4.8"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_INSTALL_LIBSTDCPP || \
+		!BR2_HOST_GCC_AT_LEAST_4_8 || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
+
+comment "llvm support needs a toolchain not affected by GCC bug 64735"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_HAS_GCC_BUG_64735
+
 # inform the .mk file of gallium, dri or vulkan driver selection
 config BR2_PACKAGE_MESA3D_GALLIUM_DRIVER
 	bool