qt4-mac: allow newer compilers on older systems

[MarcusCalhoun-Lopez]

Description

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 10.6.8
Xcode 3.2.6

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL?

• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?

[macportsbot]

Notifying maintainers:
@michaelld for port qt4-mac.

[michaelld]

Lawd have mercy ... more qt4-mac patches!

[michaelld]

So do I read this correctly that we're trying to build Qt4 here with C/C++98 unless C++11 is specified? Meaning we specifically tell the compiler the standard to use, all of the time ... trying to avoid using more recent C/C++ standards so-as to avoid the pitfalls of them on such old code?

[kencu]

that would appear to work so long as some qt4 dep doesn't go all c++11-only on us...

[macportsbot]

Travis Build #9125 Errored.

Lint results

--->  Verifying Portfile for qt4-mac
--->  0 errors and 0 warnings found.

Port qt4-mac fail on xcode9.4. Log

The build timed out.

[MarcusCalhoun-Lopez]

So do I read this correctly that we're trying to build Qt4 here with C/C++98 unless C++11 is specified? Meaning we specifically tell the compiler the standard to use, all of the time ... trying to avoid using more recent C/C++ standards so-as to avoid the pitfalls of them on such old code?

Yes, that is the idea.
I have not tested it, but it may be possible to override the override if a port requires both Qt4 and C++11.

Lawd have mercy ... more qt4-mac patches!

Sorry.
I could not think of another way to proceed.

[kencu]

I have it building away on 10.6.8 32bit version using clang-9.0 against libc++. will report back in a few hours when it's done.

[kencu]

works, on 10.6.8 building with clang-9.0.

I had to rebuild the qt4-mac-sqlite3-plugin from source for some reason, as it was not found when I installed the binary. I don't know exactly if that was something real or gremlins, but otherwise it built and the software runs.

on 10.5 leopard I am getting segfaults trying to open qt4 applications now, but that is a separate issue.

[michaelld]

@kencu It looks like this change doesn't impact 10.13 or 10.14, so there's a good change it'll work with 10.15 as well. If it allows qt4-mac build on older OSX with more modern compilers, then I'm good with it. I honestly don't think I'll have time to test / verify this coming week. Hence, if you think this change is ready, then go ahead and merge. Thx!