[LyX/master] remove most traces of boost::regex

[Kornel Benko]

Am Sat, 28 Nov 2020 19:29:58 +0100 (CET)
schrieb Jean-Marc Lasgouttes <lasgouttes at lyx.org>:

> commit 3093789e8d285db909a98d733e19a28f48caa7b8
> Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
> Date:   Sat Nov 28 18:26:56 2020 +0100
> 
>     remove most traces of boost::regex
>     
>     1/ remove boost regex code from 3rdparty/boost. Only the cmake stuff remains.
>     
>     2/ remove traces of BOOST_LIB since there is no need anymore to
>        compile boost stuff.
>     
>     3/ remove traces of boost regexp in config/lyxinclude.m4 and INSTALL
>     
>     4/ require gcc 4.9 as minimal version in autoconf.
>     
>     Unfortunately, the net gain is only 10% of included boost size (now 21M).
> 

In process of removing boost-traces from cmake-build, I got this error
...
/usr2/src/lyx/lyx-git/src/support/checksum.cpp: In function ‘long unsigned int
lyx::support::checksum(std::ifstream&)’: /usr2/src/lyx/lyx-git/src/support/checksum.cpp:33:8:
error: ‘for_each’ was not declared in this scope crc = for_each(beg, end, crc);
        ^~~~~~~~
/usr2/src/lyx/lyx-git/src/support/checksum.cpp:33:8: note: suggested alternative: ‘fread’
  crc = for_each(beg, end, crc);
        ^~~~~~~~
...

	Kornel
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