Re: [CMake] CFLAGS disables link directories?

Andreas Naumann Thu, 28 Aug 2014 11:11:42 -0700

Hello Alexander,

your problem is not a problem of CFlags, it is much more a problem of the compiler and what you are setting with --sysroot=/sysroot.
Here you tell the compiler, that it should treat /sysroot as system library directory, so that cmake removes it from the link line, because it is part of the system. The same applies with gcc for the environment variable LIBRARY_DIR.

I hope, that helps you.
Andreas

Am 28.08.2014 18:21, schrieb Alexander Shashkevych:

Hi all,

I did't found info how cmake internally handles CFLAGS environment
variable, but I know that cmake picks it up from environment and seems this
removes link directories from linking flags added by link_directories()
command.


For example. I'm using custom sysroot, to build my app and I run cmake with
following command:

   export CFLAGS="--sysroot=/sysroot/"
   cmake ..

My cmake file is:

   # GStreamer_LIBRARY_DIRS is set by pkg_check_modules()
   link_directories(${GStreamer_LIBRARY_DIRS})

   get_directory_property(LINK_DIRS LINK_DIRECTORIES)
   message("LINK_DIRS: ${LINK_DIRS}")

   add_executable(myapp main.c)
   target_link_libraries(myapp ${GStreamer_LIBRARIES})

When CFLAGS isn't specified, then file src/CMakeFiles/myapp.dir/link.txt
contains -L/sysroot/usr/lib and -Wl,-rpath,/sysroot/usr/lib flags as
expected, but when I add CFLAGS to environment, then -L and -Wl,-rpath are
disappearing from linker options.

Could someone to confirm, is this expected behavior?

PS: Regardless of CFLAGS specified in command line or not, message() always
prints: LINK_DIRS: /sysroot/usr/lib, so internally cmake sets this property.

Thanks!

Alexander

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Re: [CMake] CFLAGS disables link directories?

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