On 2020-08-30 10:51, Manolo wrote:
>     $ ./fltk-config --compile foo.cxx
>     /Library/Developer/CommandLineTools/usr/bin/c++ -I/usr/local/src/fltk-1.4.x-git/build -I/usr/local/src/fltk-1.4.x-git -isysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_THREAD_SAFE -D_REENTRANT -o 'foo' 'foo.cxx' /usr/local/src/fltk-1.4.x-git/build/lib/libfltk.a -lm -lpthread -framework Cocoa
>     clang: warning: no such sysroot directory: '-D_LARGEFILE_SOURCE' <-- NOT EXPECTED
>     foo.cxx:1:10: fatal error: 'stdio.h' file not found <--
>     #include <stdio.h> <--
>     ^
>     1 error generated.
> 
> This error arises because the command line contains option "-isysroot" not followed by a proper SDK path.
> That path is normally computed by cmake when it runs in its variable CMAKE_OSX_SYSROOT (see clip below).cmake-clip.png
> Greg: don't you see that variable being assigned a value when you run cmake on macOS?

	Where should I look?

	I don't see it in the output of 'cmake ..', and when I grepped the build directory
	(post-cmake) for the string, I got this one hit:

$ grep -R CMAKE_OSX_SYSROOT .
./CMakeCache.txt:CMAKE_OSX_SYSROOT:STRING=

	..so it seems unset. FLTK built OK though, so not sure what's up.

> The statement at line #59 of file CMake/options.cmake is
>   list (APPEND FLTK_CFLAGS "-isysroot ${CMAKE_OSX_SYSROOT}")
> and this contributes to the value of CXXFLAGS at line #46 of file fltk-config which is expected to contain
> "-isysroot" followed by the path to the SDK adequate for the running system.

	I guess this means CMAKE isn't setting the variable.

	I don't have any CMAKE_xxx variables in my environment at build time,
	so I assume cmake derives this string by default.

$ printenv | grep CMAKE
				<-- no output
$ which cmake
/usr/local/bin/cmake

$ cmake --version
cmake version 3.16.3

CMake suite maintained and supported by Kitware (kitware.com/cmake).

	Perhaps a bug in my cmake version?

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