macos-xcode-cmake build fails with --std=c++17 SOLVED

[Kornel Benko]

Am Fri, 13 Nov 2020 17:04:18 +0100
schrieb Kornel Benko <kornel at lyx.org>:

> Am Fri, 13 Nov 2020 15:27:36 +0100
> schrieb pdv <pdvisschere at edpnet.be>:
> 
> > I suppose HAVE_DEF_MAKE_UNIQUE should have been set to one but it wasn't.
> > Removing HAVE_DEF_MAKE_UNIQUE from cmake's cache didn't help.
> > The check_cxx_source_compiles() in ConfigureChecks.cmake was never 
> > executed and HAVE_DEF_MAKE_UNIQUE was never set.
> > 
> > In the end I started from scratch and then the check ran and 
> > HAVE_DEF_MAKE_UNIQUE=1.
> > 
> > P. De Visschere  
> 
> You should remove CMakeCache.txt, so that cmake is forced to recheck everything.
> 
> It can also be that while checking, some other header files are used than at compile
> time. Possible are also different compiler settings.
> 
> 	Kornel

I had a similar problem with some left-over header files in the _build_ directory.
So starting from scratch has to mean 'with empty build dir'.

	Kornel
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