Bug 695604 – sci-mathematics/z3-4.8.6 CXXFLAGS=-Wimplicit-function-declaration - CMake Error at cmake/z3_add_cxx_flag.cmake:15 (message): The flag "-fvisibility=hidden" is required but your C++ compiler doesn't support it

• Product: Gentoo Linux
• Status: RESOLVED UPSTREAM

[Description Alessandro Barbieri 2019-09-25 00:55:12 UTC]

I have -Wimplicit-function-declaration in CXXFLAGS

-- Performing Test HAS__fvisibility_hidden
-- Performing Test HAS__fvisibility_hidden - Failed
CMake Error at cmake/z3_add_cxx_flag.cmake:15 (message):
  The flag "-fvisibility=hidden" is required but your C++ compiler doesn't
  support it
Call Stack (most recent call first):
  CMakeLists.txt:355 (z3_add_cxx_flag)


-- Configuring incomplete, errors occurred!

[Comment 1 Alessandro Barbieri 2019-09-25 00:56:26 UTC]

Created attachment 590998 [details]
z3-4.8.6:20190925-002828.log

build log

[Comment 2 Alessandro Barbieri 2019-09-25 00:56:39 UTC]

Created attachment 591000 [details]
info

emerge --info

[Comment 3 Alessandro Barbieri 2019-09-25 00:57:19 UTC]

Created attachment 591002 [details]
CMakeError.log

cmake error log

[Comment 4 Alessandro Barbieri 2019-09-25 00:57:48 UTC]

Created attachment 591004 [details]
CMakeOutput.log

cmake log

[Comment 5 Michał Górny 2019-09-28 05:57:56 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.

[Comment 6 Sergei Trofimovich (RETIRED) 2019-09-28 11:04:22 UTC]

> cc1plus: warning: command line option ‘-Wimplicit-function-declaration’ is valid for C/ObjC but not for C++

Better not to pass it to CXXFLAGS and leave it only to CFLAGS.