[KDE/Mac] Review Request 127822: address the potential name/case clash of the Attica/Attica and Attica/attica header dirs

[René J.V. Bertin]

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https://git.reviewboard.kde.org/r/127822/
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Review request for KDE Software on Mac OS X and KDE Frameworks.


Repository: attica


Description
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Attica has long adhered to an install layout that relies on case to distinguish directories. For instance:

```
include/KF5/Attica/Attica/AccountBalance
include/KF5/Attica/attica/accountbalance.h
```

Depending on the order in which those files are installed on a FS like HFS+ (in case-insensitive-but-case-preserving mode), you will end up with `Attica/Attica` or `Attica/attica` directories; the directory name case changes to reflect the last write.

Basic calls like fopen() will succeed regardless of case because the filesystem ignores case in such operations. However, compilers (clang at least) do not simply try to open a requested include file in each element of the header directory search path. They use a search algorithm to locate the file first ... and that algorithm takes case into account. So `#include <Attica/AccountBalance>` will fail if the file is installed as `include/KF5/Attica/attica/AccountBalance`.

This issue is delicate to fix: the most trivial solution (installing all headers in a single directory) would still require changes in all dependent code.

I'm just proposing a fix that builds on the assumption that the `<Attica/Foo>` style is part of C++ semantics (as opposed to a more traditional `<attica/foo.h>`). The fix installs headers in `KF5/Attica/attica` and `KF5/Attica/c++/Attica`, and adds the additional `Attica/c++` component to the header search path. It also corrects the pkg-config file.


Diffs
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  src/CMakeLists.txt 984f7ff 
  src/cmake/libKF5Attica.pc.cmake 75387fa 

Diff: https://git.reviewboard.kde.org/r/127822/diff/


Testing
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On OS X 10.9.5 with FWs. 5.20.0 installed under /opt/local . As a test-case I rebuilt `knewstuff` after changing its `src/uploaddialog_p.h` to include `<Attica/ListJob>` instead of `<attica/listjob.h>` and `<Attica/Provider>` instead of `<attica/provider.h>`.


Thanks,

René J.V. Bertin

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