Re: [Mingw-users] My compiled libraries always result in undefined references.

[dE <de....@gm...>]

On 02/18/15 18:06, John Brown wrote:
> On Wed, 18 Feb 2015 16:42:03 +0530, dE wrote:
>> On 02/18/15 14:18, John Brown wrote:
>>> On Wed, 18 Feb 2015 11:24:02 +0530, dE wrote:
>>>> On 02/18/15 10:18, dE wrote:
>>>>> Hi!
>>>>>
>>>>> I've tried to compiling ldns, cares and both of these, although
>>>>> compile, result in undefined references when trying to link a program
>>>>> using them
>>>>>
>>>>> /tmp/cci2q85W.o:ldns_resolv.c:(.text+0x55): undefined reference to
>>>>> `ldns_dname_new_frm_str'
>>>>>
>>> [many more undefined references snipped]
>>>
>>>>> I installed using MXE on Linux.
>>>> So I compiled libregex and made test.c
>>>>
>>>> #include <regex.h>
>>>> int main () {
>>>> struct re_pattern_buffer test;
>>>> re_compile_fastmap (&test);
>>>> }
>>>>
>>>> PATH="/home/de/mxe/usr/bin:$PATH"
>>>> /home/de/mxe/usr/bin/i686-pc-mingw32-gcc-4.8.1
>>>> -lregex test.c
>>>> /tmp/ccWVANE9.o:test.c:(.text+0x16): undefined reference to
>>>> `re_compile_fastmap'
>>> It seems that when you installed libregex (and the other)
>>> libraries , you did not put them in the cross-compiler's search path.
>>> They probably got installed under /usr/local. Wherever they are, they
>>> must be moved to the correct location.
>>>
>>> 1) Where is libregex*.a?
>>> 2) What is the output of
>>> $ i686-pc-mingw32-gcc-4.8.1 --print-search-dirs
>>>
>>> Regards,
>>> John Brown.
>>>
>> libregex is in the search dir that's why GCC doesn't complain of it being missing. It's in mxe/usr/i686-pc-mingw32/lib
>>
>> Besides all libraries are installed there.
>>
>> install: /home/de/mxe/usr/lib/gcc/i686-pc-mingw32/4.8.1/
>> programs: =/home/de/mxe/usr/libexec/gcc/i686-pc-mingw32/4.8.1/:/home/de/mxe/usr/libexec/gcc/i686-pc-mingw32/4.8.1/:/home/de/mxe/usr/libexec/gcc/i686-pc-mingw32/:/home/de/mxe/usr/lib/gcc/i686-pc-mingw32/4.8.1/:/home/de/mxe/usr/lib/gcc/i686-pc-mingw32/:/home/de/mxe/usr/lib/gcc/i686-pc-mingw32/4.8.1/../../../../i686-pc-mingw32/bin/i686-pc-mingw32/4.8.1/:/home/de/mxe/usr/lib/gcc/i686-pc-mingw32/4.8.1/../../../../i686-pc-mingw32/bin/
>> libraries: =/home/de/mxe/usr/lib/gcc/i686-pc-mingw32/4.8.1/:/home/de/mxe/usr/lib/gcc/i686-pc-mingw32/4.8.1/../../../../i686-pc-mingw32/lib/i686-pc-mingw32/4.8.1/:/home/de/mxe/usr/lib/gcc/i686-pc-mingw32/4.8.1/../../../../i686-pc-mingw32/lib/
>>
>>
> Concentrating on libregex for now:
>
> There may be a problem with name mangling. Run
> $ i686-pc-mingw32-gcc-4.8.1 -c -o test.o test.c
> then run
> $ /path/to/cross-compiler's/nm test.o | grep re_compile_fastmap
>
> Compare the output with what you see when you run the same nm
> command on /path/to/cross-compiler's/libregex.a (or libregex.dll.a).
>
> Where did you download libregex?
>
> Regards,
> John Brown.
>
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bin/i686-pc-mingw32-nm test.o | grep re_compile_fastmap
U _re_compile_fastmap

i686-pc-mingw32-nm /home/de/mxe/usr/i686-pc-mingw32/lib/libregex.a | 
grep re_compile_fastmap
00000000 I __imp__re_compile_fastmap
00000000 T _re_compile_fastmap

Downloaded regex from here --

https://github.com/coapp-packages/libgnurx