Update make.config.in to support subdirs

[dschwoerer]

Include example

Should answer question #229

[JensMadsen]

Hi

Thank you for doing this. However, when trying to make your example I get

yolen@ubuntu:~/xtradisk/numerics/BOUT-dev/examples/make_subdir$ make
Compiling fuu.cxx
Linking sub
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o: In function _start': /build/glibc-qbmteM/glibc-2.21/csu/../sysdeps/x86_64/start.S:114: undefined reference tomain'
collect2: error: ld returned 1 exit status
../../../make.config:165: recipe for target 'sub' failed
make[1]: *** [sub] Error 1
../../make.config:86: recipe for target 'fuu' failed
make: *** [fuu] Error 2

Can you help?

[bendudson]

I had the same problem, but think I found the solution: You have to run
"configure" first, to update the make.config script

On 26 September 2016 at 13:03, Jens Madsen notifications@github.com wrote:

Hi

Thank you for doing this. However, when trying to make your example I get

yolen@ubuntu:~/xtradisk/numerics/BOUT-dev/examples/make_subdir$ make
Compiling fuu.cxx
Linking sub
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o: In
function _start':
/build/glibc-qbmteM/glibc-2.21/csu/../sysdeps/x86_64/start.S:114:
undefined reference tomain'
collect2: error: ld returned 1 exit status
../../../make.config:165: recipe for target 'sub' failed
make[1]: *** [sub] Error 1
../../make.config:86: recipe for target 'fuu' failed
make: *** [fuu] Error 2

Can you help?

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[JensMadsen]

That fixed my problems:-D Sorry

[dschwoerer]

Yes, otherwise sub is not recognized as specialized target, and therefore it is trying to link the module to a binary - which then fails ...