On 1/20/16, David Morsberger <d...@morsberger.com> wrote: > >> On Jan 19, 2016, at 10:11 PM, Eric Wing <ewmail...@gmail.com> wrote: >> >> On 1/19/16, David Morsberger <d...@morsberger.com> wrote: >>> Any help would be appreciated. >>> >>> In particular I’d like to know how the default compiler arguments are >>> set >>> when ‘cmake -G Xcode’ is executed. The attached file contains the cmake >>> test >>> compile extracted and reformatted from CMakeOutput.log that should have >>> failed. Again, what is setting all the clang compiler options when this >>> is >>> executed? >>> >>> >>> >>> All help is appreciated >>> >>>> On Jan 18, 2016, at 2:58 PM, David Morsberger <d...@morsberger.com> >>>> wrote: >>>> >>>> I’m having an issue generating and using a XCode project using cmake >>>> -G. >>>> >>>> cmake —version >>>> cmake version 3.4.1 >>>> >>>> Xcode Version 7.2 (7C68) >>>> >>>> Mac OS 10.11. >>>> >>>> >>>> My CMakeLists.txt has a clang option that fails during the -G Xcode >>>> pass >>>> but fails when linking within XCode. >>>> >>>> The compiler / linker option is ‘-Wl,—as-needed’ >>>> >>>> The test compile/link step in ‘cmake -G Xcode' creates a long clang >>>> command with arguments ‘-Wl,—as-needed’ plus ‘—serialize-diagnostics >>>> <path >>>> to .dia file>’ >>>> >>>> The link step within Xcode after the project created has the >>>> ‘-Wl,—as-needed’ argument and does not have the ‘—serialize-diagnostics >>>> <path to .dia file>’ argument. The link fails because ‘-Wl,—as-needed’ >>>> isn’t supported. >>>> >>>> If copy and execute the long clang command from the ‘cmake -G Xcode’ >>>> command and remove the ‘—serialize-diagnostics <path to .dia file>’ >>>> then >>>> it successfully fails with ‘-Wl, —as-needed’ isn’t supported. >>>> >>>> Finally, when I use cmake to generate unix makefiles it works meaning >>>> cmake determines ‘-Wl—as-needed’ isn’t supported and doesn’t add it to >>>> the >>>> argument list. >>>> >>>> Questions: >>>> - Where is the ‘—serialized-diagnostics’ argument coming from when >>>> executing ‘cmake -G Xcode’? >>>> >>>> - What is a .dia file and how do I read it? >>>> >>>> - What’s the preferred / recommended way of detecting the non-supported >>>> ‘-Wl,—as-needed’ argument during the ‘cmake -G Xcode’ phase? One option >>>> might to be to remove the ‘—serialize-diagnostics’ argument during the >>>> generation phase. >>>> >>>> I can provide more details on request. >>>> >>>> David >>>> >>>> >>>> >> >> >> I just spot checked one of my Xcode compile logs. I see the >> —serialize-diagnostics flag, but I don't have —as-needed anywhere. >> Maybe one of your CMake scripts is adding that in, or you have set >> some kind of environment variable that clang or Xcode is picking up? >> (This recently happened to me on Linux.) > > Ed, > > In this case cmake is attempting to determine if ‘—as-needed' is a supported > option and the build should fail. > > I have searched (grep’d) everything I can think of for the string > ’serialize-diagnostics’ with zero hits. > > I can easily add an ‘if( Xcode )’ around the setting in CMakeLists.txt > however I’m trying to figure out what is exactly going on. The best > solutions are chosen when you know what is going on under the hood. > > >
I believe the serialize-diagnostics flag is added by Xcode itself. I see it (along with many other flags) in a native (non-CMake generated) Xcode project. -Eric -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
