undefined reference to sin and exp in c

Asked Sep 29 '20 at 03:59

Active Sep 29 '20 at 04:03

Viewed 25 times

I am trying to compile a bunch of different object files into an executable file using this command:

gcc -Wall -Ilib -lm -Itest/lib -o test/test_passwd test/test_cases/test_passwd.c build/tests/hills_quad_two.o build/tests/hills_blank_quad.o build/tests/climber.o build/tests/hills_double.o build/tests/hills_multi_var.o build/tests/test.o build/tests/hills_sin.o build/tests/hills_exp.o

and I am getting two errors:

/usr/bin/ld: build/tests/hills_sin.o: in function `hills_sin_function':
hills_sin.c:(.text+0x100): undefined reference to `sin'
/usr/bin/ld: hills_sin.c:(.text+0x11f): undefined reference to `sin'
/usr/bin/ld: build/tests/hills_exp.o: in function `hills_exp_function':
hills_exp.c:(.text+0x122): undefined reference to `exp'
/usr/bin/ld: hills_exp.c:(.text+0x1a0): undefined reference to `exp'
collect2: error: ld returned 1 exit status

I have linked the math library using -lm in the compilation command as well as using #include <math.h> in a header file. I'm not sure what I'm doing wrong that stops it from compiling. Thanks in advance for the help.

asked Sep 29 '20 at 03:59

Dylan Herdan

2

This is a link time error. Try putting the `-lm` at the end of the command line (e.g. _after_ the `.o` files that need it) – Craig Estey Sep 29 '20 at 04:01
This a duplicate. Finding it will be mildly fiddly. – Jonathan Leffler Sep 29 '20 at 04:02
@JonathanLeffler i found it I guess, even uses sin – Antti Haapala -- Слава Україні Sep 29 '20 at 04:03
Looks appropriate. Probably one of many possibilities. – Jonathan Leffler Sep 29 '20 at 04:04

undefined reference to sin and exp in c

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