[Interest] OS X and XCode 7.0: 'TargetConditionals.h' file not found

[Sherif Ghali]

Thanks, Thiago. Let me summarize what it was about on my side.

A couple of issues are at play once one upgrades to XCode 7.0.x. The
following solved them on Yosemite (10.10); YMMV.

First off, to solve a problem that I no longer recall, I needed to add one
of
    mac::QMAKE_MAC_SDK = macosx10.9
    mac::QMAKE_MAC_SDK = macosx10.10
to some .pro files, as well as
    export
SDKROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk
to .bash_profile. Neither should be there.

After the update to XCode, you'll see that

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/
has replaced

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk

In the existing Qt (5.4.2) there were pointers to
(/Applications/.../MacOSX10.10.sdk) that Qt inserted during its
installation. I don't know if it's possible to remedy this in place, but
re-installing Qt (still 5.4.2) after the XCode update made Qt point to
.../SDKs/MacOSX10.11.sdk/. Notice that XCode 7 uses MacOSX10.11.sdk even if
one is still on Yosemite.

Sherif
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