Thread: a Compiling error?

Hi I'm using another programs makefile and its hard to really understand them for this C program. but basically when i compile the im using a command in the makefile

Code:

/sd/cc/libraries/bin/libogg.a -lm -lgcc -static
/usr/bin/ld cannot find -lm
collect2:ld returned 1 exit status

Where is lm suppose to be im assuming its linking to a math library but apparently it can't find it

my bad but basically im looking for a path to find the -lm to work and reading online basically it needs to do with libm.so and libm.a which is in my /usr/lib/ directory so should i just link a path that way to make gcc accept -lm

Originally Posted by kiros88

my bad but basically im looking for a path to find the -lm to work and reading online basically it needs to do with libm.so and libm.a which is in my /usr/lib/ directory so should i just link a path that way to make gcc accept -lm

If you want gcc to use the math libraries, -lm is the way to go, but you need to have gcc involved:

Code:

gcc -o prog source_code.c -lm

It's not a separate command.

oaky so i just have a question im reading the compiler line and its almost looks like its at teh very end the -lm but right after it is

Code:

.......    -lm -lgcc -static  /.../.../.../.../somthing.o

So i do have a cc -o prog source_code.c before the -lm but this stuff is after it would it matter? the object file is compiled in another directory so that exist

Those are other libraries/object files that you are also linking with. (Well, not static, that's just a compiler switch.)

But so basically my -lm is in the right place right? cuz I'm still getting the same compiling error and im not sure if I'm just suppose to move the -lm behind the random object file?

What error message are you getting, and show the whole line.

Code:

root@vmfedora wadst]# make
cc --prefix=/sd/cns3xxx-bsp/tools/cnstools/arm-linux-2.6-mpcore-uclibc-le-2009.05/usr -g -ggdb -O0 -Wall  -I ../../include -I ../../apps/adad -I ../../flac-1.1.3/include -I ../../flac-1.1.3/include/FLAC -I ../../libraries/libtrans -DCPUARCH_ARM  -DCONFIG_CPU_BIG_ENDIAN -o wadst wadst.o -g /sd/cc/libraries/bin/libtrans.a -g /sd/cc/libraries/bin/libFLAC.a -g /sd/cc/libraries/bin/libogg.a -lm -lgcc   -static 	/sd/cc/apps/adad/dacapi.o
/usr/bin/ld: cannot find -lm
collect2: ld returned 1 exit status
make: *** [wadst] Error 1

I mean the line is pretty long and im pretty sure the position of everything is correct but I just found out that im missing the libm.a in the /usr/lib directory but i have libm.so so does that just mean i need to just have a libm.a installed or something

If you use the --static flag, then no linking with dynamic/shared libraries is going to happen, that is correct. You may need to find or re-create libm.a in that case.

Okay sorry for all this hassle it helped me though think about it i realized the error was stupid I checked the fedora software and all i had to do was download a glibc static libraries and that fixed everything thank you all