I am struggling with the issue while linking my code against libmagic:
test.c:(.text+0x16): undefined reference to `magic_open'
test.c:(.text+0x50): undefined reference to `magic_load'
test.c:(.text+0x60): undefined reference to `magic_error'
test.c:(.text+0x84): undefined reference to `magic_close'
test.c:(.text+0x9e): undefined reference to `magic_file'
test.c:(.text+0xba): undefined reference to `magic_close'
collect2: ld returned 1 exit status
However the issue appears only when gcc version > 4.4. To compile, I am using the the following command:
gcc -L/usr/lib/ -lmagic test.c -o test
An example code that uses libmagic might be found here. I have checked and this issue appears as well. Obviously the libmagic and libmagic-dev are installed on my system (Ubuntu 14.04).
Is there any way of handling this issue different thant downgrading gcc version?
This is a FAQ, unrelated to your version of GCC.
I don't think that your compilation succeeded with gcc-4.3
Order of arguments to gcc matter a lot (see e.g. this); object files and libraries should go last (from the high-level to the low-level ones). Try with
gcc -Wall -g test.c -lmagic -o mytest
BTW, don't call your executable test (but e.g. mytest) since test is often a shell builtin.