[CMake] Execution order

[David Aldrich]

Hi Ryan

Thanks for your reply.

CMakeLists.txt always lives in the source directory I assume?

If it does live with the source, is there anyway of moving the clutter of cmake_install.cmake, CMakeFiles etc. in the source directory?
David

From: Ryan Pavlik [mailto:rpavlik at iastate.edu]
Sent: 17 September 2010 13:07
To: David Aldrich
Cc: Chris Hillery; cmake at cmake.org
Subject: Re: [CMake] Execution order

Your build system would be independent where the output files are: the user can choose whatever build directory they want, and not be limited to _gnuDebug and _gnuRelease.  (If they so chose, they could create each of those and configure a build into them, but they are just as likely to not do so. Actually, as I look at your info again, it looks like you're making lots of those _gnuRelease directories - that definitely looks like an in-source build.)  If that's a policy you want to encourage in your organization, that's just fine, but to CMake, you should keep things relative to CMAKE_SOURCE_DIR/CMAKE_CURRENT_SOURCE_DIR and CMAKE_BINARY_DIR/CMAKE_CURRENT_BINARY_DIR.  The general guideline is to never modify or generate anything into the _SOURCE_DIR - only into the _BINARY_DIR, that way you can get back to a clean source tree by just deleting the build directory.  The makefiles generated by CMake will all be in the binary directory (and as a preemptive warning: don't commit the generated makefiles to source control, they are not machine-independent), so that's where you'd run make.

Hope this helps!

Ryan
On Fri, Sep 17, 2010 at 6:24 AM, David Aldrich <David.Aldrich at eu.nec.com<mailto:David.Aldrich at eu.nec.com>> wrote:
Hi Chris

> No, you shouldn't have to, unless you're using in-source builds
> which is very strongly deprecated. Once you've gotten used to
> out-of-source builds you'll never want to go back.
Ok, I'm trying to think of how this would work for us.

The source for each of our libraries is in a separate subdirectory as you would expect. The subdirectory structure is:

Subdir ----- .cpp files
        |
        |-- Makefile
        |
        |-- _gnuDebug      <=== .o and .a files for Debug build
        |
        |-- _gnuRelease    <=== .o and .a files for Release build

Would you call that an out-of-source build, or would you require the Makefile to be in a 'Build' subdirectory below the source?

Or, would you really like to see the build files somewhere to the side of the source files?

Best regards

David
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