llvm: add dependency on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735

LLVM uses std::shared_future, which until gcc 7.x isn't available on
architectures that don't provide lock-free atomics, see
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64735.

Buildroot already has a BR2_TOOLCHAIN_HAS_GCC_BUG_64735 option to
handle such a case, so simply add this new dependency to LLVM. It will
make sure LLVM doesn't get built on ARMv5 platforms using a gcc older
than 7.x.

Fixes:

  http://autobuild.buildroot.net/results/ada497f6a8d20fa1a9adb2b17a138d7b726a6cdc/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Acked-by: Valentin Korenblit <valentin.korenblit@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

diff --git a/package/llvm/Config.in b/package/llvm/Config.in
index 70f73f4858568d92f72cdc5e6bf276ba78ea7c01..15f2507ef211bc64522346b48b50f8a69484eb94 100644 (file)
--- a/package/llvm/Config.in
+++ b/package/llvm/Config.in
@@ -18,6 +18,7 @@ config BR2_PACKAGE_LLVM
        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
        help
          The LLVM Project is a collection of modular and reusable
          compiler and toolchain technologies.
@@ -38,3 +39,7 @@ comment "llvm 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 needs a toolchain not affected by GCC bug 64735"
+       depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+       depends on BR2_TOOLCHAIN_HAS_GCC_BUG_64735