Review Request 119275: Fix: Same variable in camelCase and REQUIRED_HEADERS doesn't export all headers

[Michael Pyne]

> On July 14, 2014, 10:57 p.m., Aleix Pol Gonzalez wrote:
> > Is this because of the usage of list(APPEND)? Maybe using set(.. PARENT_SCOPE) for appending would do the trick as well?
> 
> Andreas Xavier wrote:
>     Can you confirm that you are seeing the same problem?  
>     
>     This is my first time trying to compile KF5 and the problem is most likely to be with my setup.  
>     
>     If I know that everyone is experiencing the problem, then I will try to fix it in ecm using set( .. PARENT_SCOPE).
> 
> Cristian Oneț wrote:
>     I remember running into something similar while building using kdesrc-build. I just suspected that it's something related to my setup since it went away once I manually ran 'make install' from the build directory created by kdesrc-build.
>     While building on Windows using emerge I didn't see this though.
> 
> Alex Merry wrote:
>     I can't reproduce this (and, additionally, the [CI system](http://build.kde.org) does a completely clean build and install every time). Can you post the output of `cmake --version`, please?
> 
> Andreas Xavier wrote:
>     Entirely my mistake.  All of frameworks compiled with no changes.
>     
>     Thank you for taking the time to look at this.
>     
>     I am now running with :
>     cmake version 3.0.20140712-g2eadd1
>     
>     One nameless Konsole tab over I was running with : 
>     cmake version 2.8.12.2
>     
>     It might be worth noting that with the changes in this patch cmake 2.8.12.2 was able to compile frameworks all the way to KHTML with no complaints.  Clearly, I am a cmake novice, but if this patch doesn't break the build with 3.0 and it makes it possible to build it with 2.8.12.2 it might make the overall build more robust.
>     
>     Once again thanks for your time.

I'll look into whether kdesrc-build is failing on the first-ever-build use case, there's a recently-opened bug about it (bug 337446) so it's very possible.


- Michael


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On July 15, 2014, 9:36 p.m., Andreas Xavier wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/119275/
> -----------------------------------------------------------
> 
> (Updated July 15, 2014, 9:36 p.m.)
> 
> 
> Review request for KDE Frameworks, Alex Merry and Michael Pyne.
> 
> 
> Repository: kcoreaddons
> 
> 
> Description
> -------
> 
> Using the same variable name for var1 and var2 in the new ecm_generate_headers() syntax, when it is called more than once only exports the headers from the first invokation of ecm_generate_headers(), where var1 and var2 are defined as follows.
> 
> ecm_generate_headers(var1
> ...
>     REQUIRED_HEADERS var2
> )
> 
> It doesn't show up in existing builds because cmake doesn't delete old header files.
> 
> 
> Steps to Replicate the Problem:
> 1. Delete the existing header files for KCoreAddons and the existing build files.
>    rm -r $KF5/KcoreAddons
>    rm -r <your kcoreaddons/build directory>
> 2. Re-build kcoreaddons from a new build dir
>    cmake -DCMAKE_INSTALL_PREFIX=$KF5 ..
> 3. Check in $KF5/KcoreAddons and there should only be these headers:
>    KAboutData  kaboutdata.h  kcoreaddons_export.h
>    
>    
> Solution:
> This patch solves the problem by changing the name of var2 to KCoreAddons_HEADERS_lowercase and exporting both KCoreAddons_HEADERS and KCoreAddons_HEADERS_lowercase.
> 
> Extended Solution:
> If this patch is approved, then I will 
> 1. Submit patches to the other frameworks using ecm_generate_headers() in this fashion.
> 2. submit a patch to extra-cmake-modules to warn when var1 and var2 have the same name. 
> 
> 
> Diffs
> -----
> 
>   src/lib/CMakeLists.txt 26eb5a1 
> 
> Diff: https://git.reviewboard.kde.org/r/119275/diff/
> 
> 
> Testing
> -------
> 
> Compiled kcoreaddons, then checked that all headers generated and exported.
> 
> Ran unittests.
> 
> 
> Thanks,
> 
> Andreas Xavier
> 
>

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