Re: Mac Build Error

[David Morsberger <dave () morsberger com>]

> On Jan 20, 2016, at 12:02 PM, Stig Bjørlykke <stig () bjorlykke org> wrote:
>
> On Wed, Jan 20, 2016 at 3:48 PM, David Morsberger <dave () morsberger com <mailto:dave () morsberger com>> wrote:
> My current workaround is the following change to CMakeLists.txt :
> -if(NOT CMAKE_C_COMPILER_ID MATCHES "MSVC")
> +if(NOT (CMAKE_C_COMPILER_ID MATCHES "MSVC" OR XCODE))
>       set(WIRESHARK_LD_FLAGS
>               -Wl,--as-needed
>
> This is more like fixing the symptom, right?
> The real issue here is that CMake finds support for the flags while building with Xcode does not.

After a detailed analysis of cmake, I believe this is the solution and not just fixing the symptom. 

cmake uses /usr/bin/xcodebuild when using -G Xcode. The internal behavior of cmake is significantly different when 
using xcodebuild in contrast to generating Unix makefiles. Specifically, try_run used by CHECK_C_SOURCE_RUNS and 
try_compile used by CHECK_C_SOURCE_COMPILES do not use the environment variables in the same way when using the Xcode 
Generator.

Guy, the normal behavior of CHECK_C_SOURCE_RUNS for Unix makefiles will check linker flags because it does attempt to 
link and run the resulting executable. This is why ‘—-as-needed' fails when using basic cmake. 

I hope I never have to reverse engineer cmake in the future.

David

___________________________________________________________________________
Sent via:    Wireshark-dev mailing list <wireshark-dev () wireshark org>
Archives:    https://www.wireshark.org/lists/wireshark-dev
Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev
             mailto:wireshark-dev-request () wireshark org?subject=unsubscribe