Hello there,
I'm just starting out getting deeper into a "curly bracket" Language. So I'm a
fairly
unexperienced in debugging gcc/linker messages. Sadly this is what I get trying
to
compile even an libssh2 sample.
I'm mostly coding in Python, from small scripts up to more complex, Object
Oriented
stuff. For the smaller scripts I wrote a convenience wrapper around the python
lib
Paramiko which is a library around ssh and the likes. Being able to execute
commands
via ssh and parse the results is at the core of the most scripts I write. So I
thought this
to be a good starting point for learning C/ Objective-C. Asking the Interwebs I
found
libssh2 to be the proper library for this. However, after grabbing the latest
tar-ball and compiling
it with the three-step:
./configure
(Here the summary of configure)
configure: summary of build options:
version: 1.4.2
Host type: x86_64-apple-darwin11.4.0
Install prefix: /usr/local
Compiler: gcc
Compiler flags: -DLIBSSH2_DARWIN
Library types: Shared=yes, Static=yes
Crypto library: openssl: yes (AES-CTR: no) libgcrypt: no
Debug build: no
Build examples: yes
Path to sshd: /usr/sbin/sshd (only for self-tests)
libz compression: yes
make
make install
I find myself stuck with a linker error that I just cannot solve. I "googled" a
lot and found others with
similar, yet not the same problem. And most of the time the answer/solution was
a bit too much for
me. Yet I have a suspicion that the solution is much simpler than I expect. As
it seems for to be a
problem with the arch of the host. My Mac is a x86_64 machine and configure
figured that one out
all right. But after I assembled a test programm, that was not complete but at
a point where I could
try to build it, I got errors. So I decided to try and build an example that
was provided (and already build)
with the tar-ball. But I get the same errors:
Undefined symbols for architecture x86_64:
"_libssh2_init", referenced from:
_main in cc6PUHa5.o
"_libssh2_session_init_ex", referenced from:
_main in cc6PUHa5.o
"_libssh2_session_handshake", referenced from:
_main in cc6PUHa5.o
"_libssh2_hostkey_hash", referenced from:
_main in cc6PUHa5.o
"_libssh2_userauth_list", referenced from:
_main in cc6PUHa5.o
"_libssh2_agent_init", referenced from:
_main in cc6PUHa5.o
"_libssh2_agent_connect", referenced from:
_main in cc6PUHa5.o
"_libssh2_agent_list_identities", referenced from:
_main in cc6PUHa5.o
"_libssh2_agent_get_identity", referenced from:
_main in cc6PUHa5.o
"_libssh2_agent_userauth", referenced from:
_main in cc6PUHa5.o
"_libssh2_channel_open_ex", referenced from:
_main in cc6PUHa5.o
"_libssh2_channel_setenv_ex", referenced from:
_main in cc6PUHa5.o
"_libssh2_channel_request_pty_ex", referenced from:
_main in cc6PUHa5.o
"_libssh2_channel_process_startup", referenced from:
_main in cc6PUHa5.o
"_libssh2_channel_free", referenced from:
_main in cc6PUHa5.o
"_libssh2_agent_disconnect", referenced from:
_main in cc6PUHa5.o
"_libssh2_agent_free", referenced from:
_main in cc6PUHa5.o
"_libssh2_session_disconnect_ex", referenced from:
_main in cc6PUHa5.o
"_libssh2_session_free", referenced from:
_main in cc6PUHa5.o
"_libssh2_exit", referenced from:
_main in cc6PUHa5.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
---
I tried running gcc with verbosity on which yielded, on top of the above output:
Using built-in specs.
Target: i686-apple-darwin11
Configured with: /private/var/tmp/llvmgcc42/llvmgcc42-2336.9~22/src/configure
--disable-checking --enable-werror
--prefix=/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2
--mandir=/share/man --enable-languages=c,objc,c++,obj-c++
--program-prefix=llvm- --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/
--with-slibdir=/usr/lib --build=i686-apple-darwin11
--enable-llvm=/private/var/tmp/llvmgcc42/llvmgcc42-2336.9~22/dst-llvmCore/Developer/usr/local
--program-prefix=i686-apple-darwin11- --host=x86_64-apple-darwin11
--target=i686-apple-darwin11 --with-gxx-include-dir=/usr/include/c++/4.2.1
Thread model: posix
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)
/usr/llvm-gcc-4.2/bin/../libexec/gcc/i686-apple-darwin11/4.2.1/cc1 -quiet -v
-imultilib x86_64 -iprefix
/usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1/ -D__DYNAMIC__
ssh2_agent.c -fPIC -quiet -dumpbase ssh2_agent.c -mmacosx-version-min=10.7.4
-m64 -mtune=core2 -auxbase ssh2_agent -version -o
/var/folders/bj/kx0hd0fd405cspwp6g9tvh5w0000gn/T//ccRkCGdH.s
ignoring nonexistent directory
"/usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1/../../../../i686-apple-darwin11/include"
ignoring nonexistent directory
"/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1/../../../../i686-apple-darwin11/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1/include
/usr/local/include
/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1/include
/usr/include
/System/Library/Frameworks (framework directory)
/Library/Frameworks (framework directory)
End of search list.
GNU C version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)
(i686-apple-darwin11)
compiled by GNU C version 4.2.1 (Based on Apple Inc. build 5658) (LLVM
build 2336.9.00).
GGC heuristics: --param ggc-min-expand=150 --param ggc-min-heapsize=131072
Compiler executable checksum: ee05ffc2102727aa16c85f6ae97aa56c
/usr/llvm-gcc-4.2/bin/../libexec/gcc/i686-apple-darwin11/4.2.1/as -arch x86_64
-force_cpusubtype_ALL -o
/var/folders/bj/kx0hd0fd405cspwp6g9tvh5w0000gn/T//ccZFQXlh.o
/var/folders/bj/kx0hd0fd405cspwp6g9tvh5w0000gn/T//ccRkCGdH.s
/usr/llvm-gcc-4.2/bin/../libexec/gcc/i686-apple-darwin11/4.2.1/collect2
-dynamic -arch x86_64 -macosx_version_min 10.7.4 -weak_reference_mismatches
non-weak -o testBuild -lcrt1.10.6.o
-L/usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1/x86_64
-L/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1/x86_64
-L/usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1
-L/usr/llvm-gcc-4.2/bin/../lib/gcc
-L/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1
-L/usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1/../../..
-L/Applications/Xcode.app/Contents/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1/../../..
/var/folders/bj/kx0hd0fd405cspwp6g9tvh5w0000gn/T//ccZFQXlh.o -lSystem -lgcc
-lSystem
---
So what got my attention was that gcc said:
Target: i686-apple-darwin11
Where as configure said:
Host type: x86_64-apple-darwin11.4.0
And I tried building the lib with
./configure --build=i686_64-apple-darwin11
which finished successfully but gcc yields the same results.
So after a very long text I'm still stuck with:
ld: symbol(s) not found for architecture x86_64
Another hint, Xcode yields also something about the linker.
Unfortunately I'm writing this email on another mac as where I encountered the
problem first.
ATM I'm unable to make Xcode on this machine find libssh2.h. But that is a
problem to ignore.
So the question of the day, does anybody know what's wrong here? Wht do I need
to change
to be able to even build the samples provided?
Best Regards,
Philipp
_______________________________________________
libssh2-devel http://cool.haxx.se/cgi-bin/mailman/listinfo/libssh2-devel
