[CMake] Internal CMake error with ExternalProject_Add and XCode

[Todd Greer]

Here's a minimal CMakeLists.txt:

	cmake_minimum_required(VERSION 2.8)
	project(cmake_ep_test)
	include(ExternalProject)
	
	ExternalProject_Add(
	  gtest
	  SOURCE_DIR ${CMAKE_SOURCE_DIR}/../googletest
	  INSTALL_COMMAND ""
	  LOG_DOWNLOAD ON
	  LOG_CONFIGURE ON
	  LOG_BUILD ON)
	
	add_definitions(-include global/Include.h)

We call CMake with these two lines in a shell script:
	cmake -G Xcode ..
	cmake --build . --config Release

It turns out that call to add_definitions is key. It worked perfectly until we added in the ExternalProject_Add. I don't understand why they interact, at all, but they do. 

The contents of the "googletest" directory are a copy of http://googletest.googlecode.com/svn/trunk/, but I don't expect that's actually relevant. The "-include" causes global/Include.h to be included at the beginning of every source file, and I might try moving it to CMAKE_CXX_FLAGS as a workaround.

Please let me know if I can provide any more information. I can send you a zip file of the full set of logs, or the full directory with source and build artifacts if that will be helpful (or I can file a bug and attach them there). Just let me know.

Thank you for looking into this,
Todd Greer
Principal Scientist, Affinegy, Inc.

-----Original Message-----
From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf Of Bill Hoffman
Sent: Thursday, February 21, 2013 11:41 AM
To: cmake at cmake.org
Subject: Re: [CMake] Internal CMake error with ExternalProject_Add and XCode

On 2/21/2013 12:02 PM, Todd Greer wrote:
> I'm having difficulty getting ExternalProject_Add to work with XCode. 
> It appears to be a CMake bug, and I'll file it if no one corrects me. 
> I've been unable to find any other reports of this issue.

Should work....

Can you give a small example that shows the problem?

-Bill

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