/ usr / bin / ld：错误：找不到-lecl

Question

I'm trying to compile Example of a C program embedding ECL with callbacks to C functions. github . I have installed ECL (Embeddable Common Lisp) by cloning the ECL repo with git clone git://git.code.sf.net/p/ecls/ecl ecl and then $ make and # make install , and the install seems to ok, at least ECL Developers' Guide: 2.6 Compiler examples compile fine.

When trying to compile ecldemo.c with gcc ecldemo.c -lecl I get the following error:

/usr/bin/ld: error: cannot find -lecl
/tmp/ccRk8Q48.o:ecldemo.c:function foo: error: undefined reference to 'ecl_make_integer'
/tmp/ccRk8Q48.o:ecldemo.c:function bar: error: undefined reference to 'ecl_make_integer'
/tmp/ccRk8Q48.o:ecldemo.c:function ecl_call: error: undefined reference to 'ecl_make_simple_base_string'
/tmp/ccRk8Q48.o:ecldemo.c:function ecl_call: error: undefined reference to 'si_string_to_object'
/tmp/ccRk8Q48.o:ecldemo.c:function ecl_call: error: undefined reference to 'si_safe_eval'
/tmp/ccRk8Q48.o:ecldemo.c:function init: error: undefined reference to 'cl_boot'
/tmp/ccRk8Q48.o:ecldemo.c:function init: error: undefined reference to 'cl_shutdown'
/tmp/ccRk8Q48.o:ecldemo.c:function init: error: undefined reference to 'ecl_make_simple_base_string'
/tmp/ccRk8Q48.o:ecldemo.c:function init: error: undefined reference to 'si_string_to_object'
/tmp/ccRk8Q48.o:ecldemo.c:function init: error: undefined reference to 'ecl_def_c_function'
/tmp/ccRk8Q48.o:ecldemo.c:function init: error: undefined reference to 'ecl_make_simple_base_string'
/tmp/ccRk8Q48.o:ecldemo.c:function init: error: undefined reference to 'si_string_to_object'
/tmp/ccRk8Q48.o:ecldemo.c:function init: error: undefined reference to 'ecl_def_c_function'
/tmp/ccRk8Q48.o:ecldemo.c:function main: error: undefined reference to 'ecl_make_simple_base_string'
/tmp/ccRk8Q48.o:ecldemo.c:function main: error: undefined reference to 'si_string_to_object'
/tmp/ccRk8Q48.o:ecldemo.c:function main: error: undefined reference to 'si_safe_eval'
/tmp/ccRk8Q48.o:ecldemo.c:function main: error: undefined reference to 'cl_print'
/tmp/ccRk8Q48.o:ecldemo.c:function main: error: undefined reference to 'cl_equal'
collect2: error: ld returned 1 exit status

I wonder this error row:

/usr/bin/ld: error: cannot find -lecl

It seems to me that gcc somehow interprets -lecl as a source file, and not as option -l library (search the library named library ) as it should. Leaving a space between -l and ecl ( gcc ecldemo.c -l ecl ) doesn't help, the output is the same ( cannot find -lecl ).

As ecl.h is located in /usr/local/include/ecl/ and in ecldemo.c it's included with #include "ecl/ecl.h" , I tried adding a library directory with -L option:

gcc -L /usr/local/include/ecl ecldemo.c -l ecl

... but to no avail, the same error usr/bin/ld: error: cannot find -lecl persisted.

Any ideas what might cause this error and how could this be fixed?

Answer 1

Your -L option is wrong. You need to tell it where to find the library , not where to find the header file. The library is most likely called libecl.so or libecl.a or something like that.

Answer 2

不要直接指定-lecl和-L... ，而是使用ecl-config ：

gcc `ecl-config --cflags` ecldemo.c -o ecldemo `ecl-config --libs`

Answer 3

Based on http://ecls.sourceforge.net/ecldev/Compiler-examples.html

;;; Invoking external command: gcc -o "libmyecl.so" -L"/usr/lib/ecl/" "myecl.o" "hello.o"  -Wl,–rpath,/usr/lib/ecl/ -shared   -lecl -lgmp -lgc -ldl -lm

I think you need

gcc -L/usr/lib/ecl ecldemo.c -lecl