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cannot find-lABC [message #1826860]

Sat, 02 May 2020 21:32

imb 45

Messages: 6
Registered: May 2020

Junior Member

Hi guys , i need your help please
So i want to add external library to my project in order to compile correctly.
The problem is that my library is "ABC.LIB" don't link properly :
Solution 1
add in setting -> MinGW C Linker -> Libraries the path of the library(-L) and since the library doesn't start with "lib" i left the (-l) tab empty and added the library in Miscellaneous-> Other object but the problem is when i build the project i got the error ''undefined reference to xxx" i think it's due to the fact that the gcc start with object files before library

gcc "-LC:\\User\\Desktop\\CCmpUTest\\src\\Env\\Dependencies\\lib" -o aaa.exe "src\\Cmp\\hello1.o" "src\\Cmp\\hello2.o" "..\\src\\Env\\Dependencies\\lib\\ABC.LIB"

Solution 2
I tried to rename the lib file to "libabc.lib" or change extension to "libabc.a" but i got the error cannot find-labc

Can someone help me please with this issue, i've been stuck with it for a while :/

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Re: cannot find-lABC [message #1826877 is a reply to message #1826860]

Sun, 03 May 2020 18:30

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

The .lib suffix suggests that the library is not a normal library for the GNU toolset. Are you sure that it is in proper format to link with the GNU ld?

--

Tauno Voipio

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Re: cannot find-lABC [message #1826959 is a reply to message #1826877]

Tue, 05 May 2020 11:07

imb 45

Messages: 6
Registered: May 2020

Junior Member

Hi Tauno,
Thank you for your response, actually i don't know but the .lib fie is result of compilation by MS Visual C++

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Re: cannot find-lABC [message #1826961 is a reply to message #1826959]

Tue, 05 May 2020 11:26

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

That's it. MS C++ binaries do not link with GCC object code.

--

Tauno Voipio

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Re: cannot find-lABC [message #1826963 is a reply to message #1826961]

Tue, 05 May 2020 12:00

imb 45

Messages: 6
Registered: May 2020

Junior Member

But i need informations (explicit functions) only defined in those .lib files to build my c project correctly. Is there a way to do it ?

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Re: cannot find-lABC [message #1826966 is a reply to message #1826963]

Tue, 05 May 2020 13:03

Tauno Voipio

Messages: 742
Registered: August 2014

Senior Member

If you're going to use the functions in the library, you *do* need to link with the binary format. The function definitions should be in the header file.

Sorry, no win here.

--

Tauno Voipio

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Re: cannot find-lABC [message #1826968 is a reply to message #1826966]

Tue, 05 May 2020 13:09

imb 45

Messages: 6
Registered: May 2020

Junior Member

Sorry, that's what i meant i need to use functions already defined in header files. I've searched on the internet for a way to convert those *.lib files into *.a files but it doesn't seem to work or i'm doing it wrong :/

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Re: cannot find-lABC [message #1826974 is a reply to message #1826968]

Tue, 05 May 2020 14:28

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

You're stuck.
http://www.mingw.org/wiki/Interoperability_of_Libraries_Created_by_Different_Compiler_Brands

Even MS VC++ files from different versions of Visual C++ won't necessarily link with each other.
https://stackoverflow.com/questions/4782714/gcc-vs-ms-c-compiler-for-maintaining-api-backwards-binary-compatibility/4782874#4782874
https://stackoverflow.com/a/4833439

Switch to MSVC++ for your toolchain or try to find the lib source and rebuild with g++.

[Updated on: Tue, 05 May 2020 18:06]

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Re: cannot find-lABC [message #1827076 is a reply to message #1826974]

Wed, 06 May 2020 16:07

imb 45

Messages: 6
Registered: May 2020

Junior Member

How to use MSVC++ for toolchain, i didn't find it on tools suggested in the toolchain tab

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Re: cannot find-lABC [message #1827081 is a reply to message #1827076]

Wed, 06 May 2020 19:11

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

I did this long ago and can't remember what I did.
The Eclipse documentation says all you need is to install Windows SDK.
Under Help-->Install New Software-->Programming Languages there is a selection for Visual C++ Support.
I'm not using currently using Windows so I can't try it myself.

index.php/fa/38059/0/

This thread might help:
https://stackoverflow.com/questions/41401515/visual-studio-toolchain-in-eclipse-for-c
https://stackoverflow.com/a/60646506

Attachment: MSVC++Support.png
(Size: 17.63KB, Downloaded 171 times)

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