[syslog-ng] Not able to link syslog-ng libraries through gcc

[Nitish Saboo]

Hi,

Apologies for bothering.Issue is resolved.

Thanks,
Nitish

On Thu, Mar 5, 2020 at 5:12 PM Nitish Saboo <nitish.saboo55 at gmail.com>
wrote:

> Hi,
>
> I compiled syslog-ng-3.25.1 using the following code:
>
> tar -xvzf syslog-ng_3.25.1.tar.gz
>
> mkdir -p syslog-ng_3.25.1/build
>
> cd syslog-ng_3.25.1/build
>
> ../configure
> --prefix=/home/nsaboo/Desktop/Cproject/syslog/syslog-ng_3.25.1/install
>
> make
>
> make install
>
> Post installation,the folder structure looks like this:
>
> nsaboo at ubuntu:~/Desktop/Cproject/syslog/syslog-ng-3.25.1/install$ ls -lrt
> total 28
> drwxrwxr-x 2 nsaboo nsaboo 4096 Feb 11 04:08 sbin
> drwxrwxr-x 2 nsaboo nsaboo 4096 Feb 11 04:08 bin
> drwxr-xr-x 2 nsaboo nsaboo 4096 Feb 11 04:08 var
> drwxr-xr-x 3 nsaboo nsaboo 4096 Feb 11 04:08 share
> drwxrwxr-x 4 nsaboo nsaboo 4096 Feb 11 04:08 include
> drwxr-xr-x 3 nsaboo nsaboo 4096 Feb 11 04:08 etc
> drwxrwxr-x 4 nsaboo nsaboo 4096 Feb 18 00:35 lib
> nsaboo at ubuntu:~/Desktop/Cproject/syslog/syslog-ng-3.25.1/install$
>
> I have a C code base (syslog-node.c) and header file (node.h) that is
> internally calling syslog-ng patterndb apis':
> I have a main.c file that calls methods in 'syslog-node.c'.
>
> My header file has following methods:
>
> typedef void (*key_value_cb)(const char* key, const char* value, size_t
> value_len, int data);
> int initialize_engine(const char* filename, const char* module_path,
> key_value_cb cb);
> int reload_pattern_db(const char* filename, key_value_cb cb);
> int load_pattern_db(const char* filename, key_value_cb cb);
> void match(const char* pattern, size_t pattern_len, const char* program,
> size_t program_len);
> int shutdown();
>
>
> I am calling following gcc command to create a binary but it is erroring
> out:
>
>  gcc -L/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/install/lib
> lsyslog-ng
> -L/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/install/lib/syslog-ng
> ldbparser -I/usr/include/glib-2.0
> -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
> -I/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/install/include/syslog-ng
> -I/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/install/include
> -I/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/
> -I/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/build/
> -I/usr/local/include/eventlog/ syslog-node.c main.c -o main
>
>  Error
>  =====
>
> nsaboo at ubuntu:~/Desktop/Cproject$  gcc
> -L/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/install/lib
> -lsyslog-ng
> -L/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/install/lib/syslog-ng
> -ldbparser -I/usr/include/glib-2.0
> -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
> -I/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/install/include/syslog-ng
> -I/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/install/include
> -I/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/
> -I/home/nsaboo/Desktop/Cproject/syslog/syslog-ng-3.25.1/build/
> -I/usr/local/include/eventlog/ syslog-node.c main.c -o main
> /tmp/ccam1ao5.o: In function `pdbtool_pdb_emit_accumulate':
> syslog-node.c:(.text+0x55): undefined reference to `logmsg_registry'
> syslog-node.c:(.text+0x73): undefined reference to `nv_table_foreach'
> /tmp/ccam1ao5.o: In function `match':
> syslog-node.c:(.text+0x93): undefined reference to `log_msg_new_empty'
> syslog-node.c:(.text+0xb0): undefined reference to `log_msg_set_value'
> syslog-node.c:(.text+0xc9): undefined reference to `log_msg_set_value'
> syslog-node.c:(.text+0xdf): undefined reference to `pattern_db_process'
> syslog-node.c:(.text+0xeb): undefined reference to `log_msg_unref'
> /tmp/ccam1ao5.o: In function `reload_pattern_db':
> syslog-node.c:(.text+0x1e2): undefined reference to `pattern_db_free'
> syslog-node.c:(.text+0x1e7): undefined reference to `pattern_db_new'
> syslog-node.c:(.text+0x20b): undefined reference to
> `pattern_db_reload_ruleset'
> syslog-node.c:(.text+0x225): undefined reference to
> `pattern_db_set_emit_func'
> /tmp/ccam1ao5.o: In function `load_pattern_db':
> syslog-node.c:(.text+0x257): undefined reference to `pattern_db_free'
> syslog-node.c:(.text+0x25c): undefined reference to `pattern_db_new'
> syslog-node.c:(.text+0x280): undefined reference to
> `pattern_db_reload_ruleset'
> syslog-node.c:(.text+0x29a): undefined reference to
> `pattern_db_set_emit_func'
> /tmp/ccam1ao5.o: In function `initialize_engine':
> syslog-node.c:(.text+0x2ba): undefined reference to `app_startup'
> syslog-node.c:(.text+0x2c4): undefined reference to `msg_init'
> syslog-node.c:(.text+0x2cb): undefined reference to
> `resolvedConfigurablePaths'
> syslog-node.c:(.text+0x2d0): undefined reference to
> `resolved_configurable_paths_init'
> syslog-node.c:(.text+0x2db): undefined reference to
> `resolvedConfigurablePaths'
> syslog-node.c:(.text+0x2e5): undefined reference to `cfg_new'
> syslog-node.c:(.text+0x2fb): undefined reference to `cfg_set_global_paths'
> syslog-node.c:(.text+0x311): undefined reference to `cfg_load_module'
> syslog-node.c:(.text+0x327): undefined reference to `cfg_load_module'
> syslog-node.c:(.text+0x32c): undefined reference to
> `pattern_db_global_init'
> syslog-node.c:(.text+0x347): undefined reference to `pattern_db_free'
> syslog-node.c:(.text+0x34c): undefined reference to `pattern_db_new'
> syslog-node.c:(.text+0x370): undefined reference to
> `pattern_db_reload_ruleset'
> syslog-node.c:(.text+0x38a): undefined reference to
> `pattern_db_set_emit_func'
> /tmp/ccam1ao5.o: In function `shutdown':
> syslog-node.c:(.text+0x39a): undefined reference to `app_shutdown'
> collect2: error: ld returned 1 exit status
>
> Those functions are available in the shared libraries.nm command output
> shows the same
>
> nsaboo at ubuntu:~/Desktop/Cproject$ nm
> syslog/syslog-ng-3.25.1/install/lib/syslog-ng/libdbparser.so | grep T |
> grep 'pattern_db_set_emit_func'
> 0000000000010d40 T pattern_db_set_emit_func
> nsaboo at ubuntu:~/Desktop/Cproject$ nm
> syslog/syslog-ng-3.25.1/install/lib/syslog-ng/libdbparser.so | grep T |
> grep 'pattern_db_new'
> 0000000000010ef0 T pattern_db_new
> nsaboo at ubuntu:~/Desktop/Cproject$ nm
> syslog/syslog-ng-3.25.1/install/lib/syslog-ng/libdbparser.so | grep T |
> grep 'pattern_db_reload_ruleset'
> 0000000000010cc0 T pattern_db_reload_ruleset
> nsaboo at ubuntu:~/Desktop/Cproject$ nm
> syslog/syslog-ng-3.25.1/install/lib/libsyslog-ng.so.0 | grep T | grep
> 'log_msg_set_value'
> 0000000000080df0 T log_msg_set_value
> 00000000000811d0 T __log_msg_set_value_by_name
> 0000000000081220 T log_msg_set_value_indirect
> nsaboo at ubuntu:~/Desktop/Cproject$ nm
> syslog/syslog-ng-3.25.1/install/lib/libsyslog-ng.so | grep T | grep
> 'msg_init'
> 0000000000051990 T msg_init
> nsaboo at ubuntu:~/Desktop/Cproject$ nm
> syslog/syslog-ng-3.25.1/install/lib/libsyslog-ng.so | grep T | grep
> 'cfg_new'
> 0000000000039200 T cfg_new
> 0000000000039360 T cfg_new_snippet
> 0000000000039390 T cfg_new_subordinate
>
>
> I understand this is the C linking error where I am including all the
> dynamic shared libraries and header files, but not able to figure out what
> is causing this issue.
> Can someone please help me to determine what am I missing here ?
>
> Thanks,
> Nitish
>
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