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From: ASSI <Stromeko@nexgo.de>
To: cygwin@cygwin.com
Subject: Re: cygport compile command fails
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Date: Wed, 15 Dec 2021 14:56:36 +0100
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 (Tatsuro MATSUOKA's message of "Wed, 15 Dec 2021 18:37:12 +0900
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Tatsuro MATSUOKA writes:
>> > In file included from /usr/src/qt5-base-5.9.4-2.src/qt5-base-5.9.4-2.x86_64/src/qtbase-opensource-src-5.9.4/src/corelib/tools/qbytearray.cpp:42:
>> > /usr/src/qt5-base-5.9.4-2.src/qt5-base-5.9.4-2.x86_64/src/qtbase-opensource-src-5.9.4/src/corelib/tools/qbytearraymatcher.h: In static member function ‘static QStaticByteArrayMatcherBase::Skiptable QStaticByteArrayMatcherBase::generate(const char*, uint)’:
>> > /usr/src/qt5-base-5.9.4-2.src/qt5-base-5.9.4-2.x86_64/src/qtbase-opensource-src-5.9.4/src/corelib/tools/qbytearraymatcher.h:103:38: error: ‘numeric_limits’ is not a member of ‘std’
>> >    103 |         const auto uchar_max = (std::numeric_limits<uchar>::max)();
>> >        |                                      ^~~~~~~~~~~~~~
>> > /usr/src/qt5-base-5.9.4-2.src/qt5-base-5.9.4-2.x86_64/src/qtbase-opensource-src-5.9.4/src/corelib/tools/qbytearraymatcher.h:103:58: error: expected primary-expression before ‘>’ token
>> >    103 |         const auto uchar_max = (std::numeric_limits<uchar>::max)();
>> >        |                                                          ^
>> > /usr/src/qt5-base-5.9.4-2.src/qt5-base-5.9.4-2.x86_64/src/qtbase-opensource-src-5.9.4/src/corelib/tools/qbytearraymatcher.h:103:61: error: ‘::max’ has not been declared; did you mean ‘std::max’?
>> >    103 |         const auto uchar_max = (std::numeric_limits<uchar>::max)();
>> >        |                                                             ^~~
>> >        |                                                             std::max

The default C++ standard targeted by gcc-11 is gnu++17.

Given how old Qt5 is and that the upstream packages were compiled w/
gcc-7 mostly, I'd guess you should either add -std=gnu++11 or
-std=gnu++14 to the CXXFLAGS.


Regards,
Achim.
-- 
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