Review Request: Look for ext/hash_map and unordered_map instead of checking gcc's version.

[Commit Hook]

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This review has been submitted with commit e37294eaa6694e4cf93012569f5ef947651f50e3 by Raphael Kubo da Costa to branch 4.3.

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On May 28, 2012, 5:40 p.m., Raphael Kubo da Costa wrote:
> 
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> (Updated May 28, 2012, 5:40 p.m.)
> 
> 
> Review request for KDevelop and Milian Wolff.
> 
> 
> Description
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> 
> Look for ext/hash_map and unordered_map instead of checking gcc's version.
> 
> Follow-up to commits 9f8e8f662974a1035ea64f0ab9404b8858a02a57 and
> 5c59bd61b1df1b963959f086c5202689c084e0f3. The decision of whether to
> include <ext/hash_map> or <unordered_map> for gcc/clang was based on
> whether gcc > 4.3 was installed or whether clang was being used. The
> latter implicitly assumed a recent enough libstdc++ version (ie. >=
> 4.3) was being used, which might not be the case on systems such as
> FreeBSD and possibly OS X.
> 
> Instead of checking for compiler versions, we now look for these
> headers: CMake first detects whether <unordered_map> is present and,
> in case it is not, it looks for <ext/hash_map>. The checks in
> languages/cpp/parser/parser.h have been updated as well. This should
> cover all the cases being previously detected, as well as fix the
> checks for FreeBSD and other systems where the build was failing
> before with clang.
> 
> 
> Diffs
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>   CMakeLists.txt 8a3be2181642d0af6e3660d52948bd24d3f8cb4a 
>   config.h.cmake 0c41fe4203dc39f4ff1e03b8b77211c7148a9bec 
>   languages/cpp/CMakeLists.txt 1577a7baffc3af052c62a075eced8d09750fdf53 
>   languages/cpp/parser/parser.h c5198912bbf83a46bc89b1595d68b71e0a9b7df4 
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> Diff: http://git.reviewboard.kde.org/r/105067/diff/
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> 
> Testing
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> Was able to build KDevelop with clang and libstdc++ 4.2.1 on FreeBSD. I would appreciate if people could test this patch on Linux with a more recent libstdc++
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> 
> Thanks,
> 
> Raphael Kubo da Costa
> 
>

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