kiros88

Hey so basically I'm trying to get a huge amount of code to compile. None of them are main files so I added a main into thats basically blank
the main might be wrong but thats not the problem so all the other code uses functions from different folders.
/root/Desktop/Vmainline/fctl/
fctl.c
uses a function from Vmain/v2lin_v02/lib
like semGive();

so i use the command
gcc -I../../v2lin_v02/lib -I/root/Desktop/VMainlineV3/h -lm -o main *.c *.h -L../../v2lin_v02/lib

and i get a whole bunch of errors basically looking like this
fctl.c.text+0x16a): undefined reference to `semGive'

and i know theres some kind of link cuz without the -I../../ v2lin.......... blah blah i would actually get a error saying
semGive() undeclared or something
so is there another way to link it or am i missing something And i even loaded the library from
v2lin_v02/lib by


export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/root/Desktop/VMainlineV3/v2lin_v02/lib

laserlight

Who wrote the "huge amount of code"? You might want to ask the author for help, read documentation, etc. If you wrote it, then I think that we should start by helping you fix your code, since at a glance it probably has alot of errors.

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bithub

Where is semGive() implemented? Is there a .c file somewhere, or is it in a library?

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kiros88

semGive() is like under
semlib.c
and a header for it is
semlib.h

and thats in VmainV3/ v2lin_v02/lib
both of them
and im compiling in VmainV3/fabric/fctl

bithub

Well that's your problem then. You probably need to compile the code in VmainV3/v2lin_v02/lib to a library, and then link to that library when you compile what's in fctl.

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tabstop

So, do you have a libsem.a, or a semlib.o, or something? If all you have is a .c file, then you need to compile it just like you compile everything else. If you have a .a file, you need to add the library with -lsem (or whatever the thing is called).

kiros88

okay so i do compile the code in that lib directory i get a libv2lin.so libv2linmain.so


then i just do
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/root/Desktop/VMainlineV3/v2lin_v02/lib

and it works fine cuz i had a test folder
/root/Desktop/VMainV3/v2lin_v02/samples/with_main


and in that folder it had a program with_main.c and it compiled and
ldd with_main

linux-vdso.so.1 => (0x00007fff3bfff000)
libv2lin.so => /root/Desktop/VMainlineV3/v2lin_v02/lib/libv2lin.so (0x00007fc333b68000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc33394c000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fc333748000)
librt.so.1 => /lib64/librt.so.1 (0x00007fc33353f000)
libc.so.6 => /lib64/libc.so.6 (0x00007fc3331e6000)
/lib64/ld-linux-x86-64.so.2 (0x00007fc333d75000)

kiros88

i get a semLib.o in the v2lin_v02/lib