2.23.11 build failure on cygwin #2

second issue building on Cygwin

The Cygwin headers are very picky and the "-std=c++14" cause some not
standard calls to fail compilation due to the reduced scope.

The solution is to remove the "-std=c++14" or to replace with "-std=gnu++14"


Only two cases showed up in my build:

---------------------------------------------------------------------
g++ -c    -DHAVE_CONFIG_H 
-I/pub/devel/lilypond/prova/lilypond-2.23.11/lily/include -I./out 
-I/pub/devel/lilypond/prova/lilypond-2.23.11/flower/include -O2 
-finline-functions -g -pipe -Wno-cast-function-type 
-isystem/usr/include/guile/2.2/guile/2.2 -isystem/usr/include/freetype2 
-isystem/usr/include/libpng16 -isystem/usr/include/pango-1.0 
-isystem/usr/include/glib-2.0 -isystem/usr/lib/glib-2.0/include 
-isystem/usr/include/freetype2 -isystem/usr/include/libpng16 
-isystem/usr/include/uuid -isystem/usr/include/harfbuzz    -std=c++14 
-fno-exceptions -Wall -Wconversion -Wextra -Wold-style-cast 
-Woverloaded-virtual -Wsuggest-override  -MMD -MP -MF ./out/main.dep -MT 
./out/main.o  -o out/main.o main.cc
main.cc: In function ‘void do_chroot_jail()’:
main.cc:470:7: error: ‘chroot’ was not declared in this scope
   470 |   if (chroot (components[JAIL].c_str ()))
       |       ^~~~~~
make[1]: *** [../make/c++-rules.make:5: out/main.o] Error 1
make[1]: Leaving directory '/pub/devel/lilypond/prova/lilypond-2.23.11/lily'
make: *** [make/generic-targets.make:6: all] Error 2
----------------------------------------------------------------------
# Making lily/out/relocate.o < cc
g++ -c    -DHAVE_CONFIG_H 
-I/pub/devel/lilypond/prova/lilypond-2.23.11/lily/include -I./out 
-I/pub/devel/lilypond/prova/lilypond-2.23.11/flower/include -O2 
-finline-functions -g -pipe -Wno-cast-function-type 
-isystem/usr/include/guile/2.2/guile/2.2 -isystem/usr/include/freetype2 
-isystem/usr/include/libpng16 -isystem/usr/include/pango-1.0 
-isystem/usr/include/glib-2.0 -isystem/usr/lib/glib-2.0/include 
-isystem/usr/include/freetype2 -isystem/usr/include/libpng16 
-isystem/usr/include/uuid -isystem/usr/include/harfbuzz    -std=c++14 
-fno-exceptions -Wall -Wconversion -Wextra -Wold-style-cast 
-Woverloaded-virtual -Wsuggest-override  -MMD -MP -MF ./out/relocate.dep 
-MT ./out/relocate.o  -o out/relocate.o relocate.cc
relocate.cc: In function ‘int sane_putenv(const char*, const string&, 
bool, bool)’:
relocate.cc:65:17: error: ‘strdup’ was not declared in this scope; did 
you mean ‘strcmp’?
    65 |       char *s = strdup (combine.c_str ());
       |                 ^~~~~~
       |                 strcmp
relocate.cc:69:20: error: ‘putenv’ was not declared in this scope; did 
you mean ‘getenv’?
    69 |       int retval = putenv (s);
       |                    ^~~~~~
       |                    getenv
relocate.cc: In function ‘void setup_paths(const char*)’:
relocate.cc:218:15: error: ‘realpath’ was not declared in this scope
   218 |   char *res = realpath (argv0_abs.c_str (), resolved_path);
       |               ^~~~~~~~
make[1]: *** [../make/c++-rules.make:5: out/relocate.o] Error 1
--------------------------------------------------------------------


Regards
Marco

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