Bug 695602 – sys-devel/llvm CXXFLAGS=-Wimplicit-function-declaration - CMake Error at cmake/modules/HandleLLVMOptions.cmake:462 (message): The host compiler does not support '-std=c++11'.

• Product: Gentoo Linux
• Status: RESOLVED UPSTREAM

[Description Alessandro Barbieri 2019-09-25 00:39:39 UTC]

I have -Wimplicit-function-declaration in CFLAGS and CXXFLAGS
the following packages fail to configure (for now)

sys-devel/llvm
sys-devel/lld
sys-devel/clang
dev-util/lldb

-- Performing Test CXX_SUPPORTS_CXX_STD - Failed
CMake Error at cmake/modules/HandleLLVMOptions.cmake:462 (message):
  The host compiler does not support '-std=c++11'.
Call Stack (most recent call first):
  CMakeLists.txt:643 (include)


-- Configuring incomplete, errors occurred!

I'll only attach logs for llvm, the others have the same failures

[Comment 1 Alessandro Barbieri 2019-09-25 00:43:03 UTC]

Created attachment 590988 [details]
llvm-log

[Comment 2 Alessandro Barbieri 2019-09-25 00:46:38 UTC]

Created attachment 590990 [details]
llvm-9.0.0:20190925-003741.log

llvm-log

[Comment 3 Alessandro Barbieri 2019-09-25 00:47:00 UTC]

Created attachment 590992 [details]
info

emerge --info

[Comment 4 Alessandro Barbieri 2019-09-25 00:47:38 UTC]

Created attachment 590994 [details]
CMakeOutput.log

cmake log

[Comment 5 Alessandro Barbieri 2019-09-25 00:48:00 UTC]

Created attachment 590996 [details]
CMakeError.log

cmake error log

[Comment 6 Alessandro Barbieri 2019-09-25 01:02:03 UTC]

Also sys-libs/libomp have the same issue

[Comment 7 Michał Górny 2019-09-28 05:58:11 UTC]

It's fun stuff you're doing but if you're doing the kind of fun-breaking-stuff, you need to send fixes upstream yourself.