Actually, I should not modify CMAKE_CXX_COMPILER_FLAGS.
It seems that the problem comes from the variable
CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS which only contains ' -bundle
-Wl,-headerpad_max_install_names' but not ' -undefined dynamic_lookup'.
How to overcome this problem?
----- Mail original -----
> De: "Cedric Doucet" <cedric.dou...@inria.fr>
> À: cmake@cmake.org
> Envoyé: Jeudi 9 Mars 2017 23:41:03
> Objet: Missing 'undefined dynamic_lookup' flag
> Hello,
> I am trying to find a portable way of generating modules with CMake.
> Here is a toy CMake script:
> -------------------------------
> CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
> PROJECT(dlopen_example CXX)
> ADD_EXECUTABLE(main main.cpp print_ref.cpp)
> TARGET_LINK_LIBRARIES(main dl)
> ADD_LIBRARY(module MODULE module.cpp)
> -------------------------------
> This script works fine with g++ on Linux Ubuntu.
> However, I get an error message with clang on Mac OSX:
> ----------------------------
> Undefined symbols for architecture x86_64:
> "print_ref()", referenced from:
> _module in module.cpp.o
> ld: symbol(s) not found for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
> make[2]: *** [libmodule.so] Error 1
> make[1]: *** [CMakeFiles/module.dir/all] Error 2
> make: *** [all] Error 2
> ----------------------------
> I found a solution to this problem by adding the 'undefined dynamic_lookup'
> flag :
> SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -undefined dynamic_lookup")
> But, I am surprised that the MODULE option of ADD_LIBRARY does not handle
> such a flag.
> Is there a portable solution to this problem with CMake?
> Best regards,
> Cédric Doucet
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