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Date:	Wed, 15 Dec 2021 06:48:54 +0100
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Subject:	Re: cygport qt5-base.cygport compile fails
To:	cygwin AT cygwin DOT com
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On 15.12.2021 04:48, Tatsuro MATSUOKA wrote:
>   cygport qt5-base.cygport compile fails
> 
> $ cygport qt5-base.cygport compile
>>>> Compiling qt5-base-5.9.4-2.x86_64
> Preparing build tree...
> Creating qmake...
> 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

Hi Tatsuro,

no idea, but I saw the same trying to build 5.12.12 recently.
However I have not see it in February when I was trying some patches
from Achim


I guess something is changed on handling
    std::numeric_limits<uchar>::max
on our C++ compiler.

The documentation
https://www.cplusplus.com/reference/limits/numeric_limits/

just reported only an expansion on C++11, but maybe something
in Cygwin is triggering a fault

Marco



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