Hello everyone,

I think I figure out why it is failing! Firstly, I am building on debian
testing, so the issue may not appear when building guix within
guix. Secondly, I run 'git clean -fdx && git reset --hard' and install
guile-gcrypt before I build, so dirty build dir and missing deps
shouldn't be cause.

ludo@gnu.org (Ludovic Courtès) writes:

> Hi Alex,
>
> Alex Vong <alexvong1995@gmail.com> skribis:
>
>>   CXXLD    guix-daemon
>> /usr/bin/ld: nix/nix-daemon/guix_daemon-guix-daemon.o: in function `main':
>> /home/alexvong1995/scm/guix/nix/nix-daemon/guix-daemon.cc:434:
>> undefined reference to `gcry_check_version'
>> /usr/bin/ld:
>> /home/alexvong1995/scm/guix/nix/nix-daemon/guix-daemon.cc:442:
>> undefined reference to `gcry_control'
>
> What does “grep LIBGCRYPT config.log” return?
>
It returns:

======================================================================
ac_cv_path_LIBGCRYPT_CONFIG=/usr/bin/libgcrypt-config
LIBGCRYPT='libgcrypt'
LIBGCRYPT_CFLAGS=''
LIBGCRYPT_CONFIG='/usr/bin/libgcrypt-config'
LIBGCRYPT_LIBDIR=''
LIBGCRYPT_LIBS='-L -lgcrypt'
LIBGCRYPT_PREFIX='no'
======================================================================

I think the problem is in '-L -lgcrypt'. Here '-lgcrypt' is interpreted
as a dir instead of a flag. To check this is indeed the case, I run
'make V=1'. Indeed, the command causing the failure is:

======================================================================
g++ -Wall -std=c++11 -g -O2   -o guix-daemon nix/nix-daemon/guix_daemon-nix-daemon.o nix/nix-daemon/guix_daemon-guix-daemon.o libstore.a libutil.a libformat.a -lz -lsqlite3 -L -lgcrypt -lbz2 
======================================================================

And after the I remove the '-L' flag, it compiles! However, I don't know
what is the root cause of this problem. Is there a bug in configure.ac /
Makefile.am or a bug in autotools itself?

> ‘nix/local.mk’ expects $(LIBGCRYPT_LIBS) to contain at least “-lgcrypt”,
> but in your case this variable seems to be empty.
>
> Ludo’.

Cheers,
Alex