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This is an automatically generated e-mail. To reply, visit:
https://git.reviewboard.kde.org/r/119300/
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Review request for KDE Frameworks, Alex Merry and Michael Pyne.


Repository: extra-cmake-modules


Description
-------

First, this is my first attempt at building frameworks, so the problem is most 
likely on my end.  However, following the instructions at 
https://community.kde.org/Frameworks/Building/Details I found this problem.

Using the same variable name for camelCase var1 and REQUIRED_HEADERS 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, so all accumulated headers remain in the build.

There are some projects in kde-frameworks that use the same variable name for 
var1 and var2, for example kcoreaddons.

Steps to Replicate Using KCoreAddons as an example:

  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

Problem:
If the same variable name is used for both var1 and var2 they overwrite each 
other at the PARENT level and the result is that only one invocation of 
ecm_generate_headers sticks. 

Solution:  
I assume that the CMakeList writer is intentionally using the same variable 
name for var1 and var2 and wants to accumulate both the camelCase and the 
lowercase.h names on the same variable.  If the variable names are the same if 
accumulates both the camelCase list and the lowercase.h list on the single 
variable.    

If my assumption is incorrect and var1 and var2 must be different to separate 
the camelCase and lowercase.h lists, then a new patch should be submitted to 
generate either a warning or an error message when var1 and var2 are the same 
name.

This review is linked with https://git.reviewboard.kde.org/r/119275/.  If this 
review is accepted then https://git.reviewboard.kde.org/r/119275/ is unecessary.


Diffs
-----

  modules/ECMGenerateHeaders.cmake bac5086 

Diff: https://git.reviewboard.kde.org/r/119300/diff/


Testing
-------

make test
Compiled kcoreaddons, checked that all the headers were exported.  Then 
compiled kauth and checked that it found the exported headers.


Thanks,

Andreas Xavier

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