I am trying to cross-compile Dropbear for an x86 machine where glibc is missing and instead, uclibc is being used. For that aim, I have cross-compiled zlib for this same instruction set using a custom crosstool-ng toolchain and installed it to a custom location.
msainz@ubuntu:~$ ls Projects/zlib_install/lib
libz.a libz.so libz.so.1 libz.so.1.2.11 pkgconfig
I have copied Projects/zlib_install/include/zlib.h and Projects/zlib/include/zconf.h to Projects/dropbear/zlibincludes/.
I've set my env variables this way:
msainz@ubuntu:~$ echo $PATH
usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:
/usr/local/games:/snap/bin:/home/msainz/x-tools/x86_64-multilib-linux-uclibc/bin
msainz@ubuntu:~/Projects/dropbear$ echo $LDFLAGS
/home/msainz/Projects/zlib_install/lib/libz.a
msainz@ubuntu:~/Projects/dropbear$ echo $CFLAGS
-Izlibincludes -I../zlibincludes
I launch the configure script this way: ./configure --prefix=/home/msainz/Projects/tmp_top_dir --host=x86
The execution terminates with the following error:
configure:4851: x86_64-multilib-linux-uclibc-gcc -o conftest -Izlibincludes -I../zlibincludes -Wno-
pointer-sign -fno-strict-overflow -fPIE -fstack-protector-strong -D_FORTIFY_SOURCE=2 -mfunction-
return=thunk -mindirect-branch=thunk /home/msainz/Projects/zlib_install/lib/libz.a -pie -Wl,-z,now -
Wl,-z,relro conftest.c -lz >&5
/home/msainz/x-tools/x86_64-multilib-linux-uclibc/bin/../lib/gcc/x86_64-multilib-linux-
uclibc/8.3.0/../../../../x86_64-multilib-linux-uclibc/bin/ld.bfd: cannot find -lz
collect2: error: ld returned 1 exit status
Any ideas to solve this? Thanks in advance.
Solved the problem adding --with-zlib=/home/msainz/Projects/zlib_install/ to the ./configure call.