qt5-qtbase: libc++ under Lion

[ctreleaven (Craig Treleaven)]

I'm trying to install qt5-qtwebkit on Lion using XCode 4.6.3.

First time around, I got all the pre-requisites installed but qt5-qtwebkit errored out insisting that libc++ was required. It pointed to and I followed the direction to build EVERYTHING with libc++:

​https://trac.macports.org/wiki/LibcxxOnOlderSystems

This build errored out at qt5-qtbase with numerous errors like:

:info:build In file included from ../../corelib/tools/qstring_mac.mm:34:
:info:build ../../corelib/tools/qstring.h:739:55: error: no type named 'u16string' in namespace 'std'
:info:build     static inline QString fromStdU16String(const std::u16string &s);
:info:build                                                  ~~~~~^

I believe this means that there is a problem with the c++ library?

Note that just prior to the failure, the Configuration Report says:

:info:configure Build options:
:info:configure   Configuration .......... accessibility audio-backend avx avx2 c++11 compile_examples concurrent corewlan cups dbus dbus-linked fontconfig full-config getaddrinfo getifaddrs glib iconv icu ipv6ifname large-config largefile medium-config minimal-config nis opengl openssl-linked png qpa qpa qt_framework reduce_exports release shared small-config sse2 sse3 sse4_1 sse4_2 ssse3 system-freetype system-harfbuzz system-jpeg system-png system-zlib xrender 
:info:configure   Build parts ............  libs tools
:info:configure   Mode ................... release
:info:configure   Using sanitizer(s)...... none
:info:configure   Using C++11 ............ yes
...

I found a similar-looking report on the web but don't see how to implement the solution (second last posting):

​https://forum.qt.io/topic/56064/solved-problem-with-qt-5-5/11

Will attach main log.

[Lord-Kamina (Gregorio Litenstein)]

I am trying to build qt5 on El Capitan (with latest XCode) and libc++ but targetting 10.7 and seeing an identical error. Also found that thread and attempted the solution via modifying the portfile and configure.env but nothing changed.

[Lord-Kamina (Gregorio Litenstein)]

Cc Me!

[MarcusCalhoun-Lopez (Marcus Calhoun-Lopez)]

The ​old version of the patch file added the -stdlib flag to the QMAKE_CXXFLAGS and QMAKE_LFLAGS variables.
There did not seem to be a need to add it to QMAKE_CXXFLAGS_CXX11 and QMAKE_LFLAGS_CXX11 as well.

Apparently, part of qt5-qtbase uses QMAKE_CXXFLAGS_CXX11 and QMAKE_LFLAGS_CXX11 but not QMAKE_CXXFLAGS and QMAKE_LFLAGS.
-mmacosx-version-min=10.7 then causes the compiler to use libstdc++, which is the source of the error.

r145151 fixed the problem on my system.
Is the problem fixed on Lion as well?

[Lord-Kamina (Gregorio Litenstein)]

Fixed for me as well, I believe.

Edit: Yes, build finished successfully.

[Lord-Kamina (Gregorio Litenstein)]

However... it appears the same problem is affecting the rest of the qt5 ports; after successfully installing qt5-base, I got the same error on qt5-qtconnectivity.

[MarcusCalhoun-Lopez (Marcus Calhoun-Lopez)]

Hopefully, r145157 fixes the new problem.

[ctreleaven (Craig Treleaven)]

I haven't updated to the last revision but I'm having a different result. qt5-qtbase built successfully. I've kicked off an install of qt5-qtwebkit and so far qt5-qtxmlpatterns, qt5-qtdeclarative, qt5-qtquickcontrols, and qt5-qtlocation have installed successfully. qt5-qtmultimedia is presently building.

I'll update tomorrow.

[Lord-Kamina (Gregorio Litenstein)]

Fixed for me.

[ctreleaven (Craig Treleaven)]

I confirm that after r145157, qt5-qtwebkit (eventually) built successfully on my Lion machine under XCode 4.6.3. Thanks for the fix and for all the work on Qt5. Outstanding!