Tag: cc

The header file and library search path of cc on OpenBSD

On my OpenBSD 6.1/amd64 system, the default header file search path of cc compiler is only /usr/include:

# echo | cc -E -Wp,-v -
ignoring duplicate directory "/usr/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include
End of search list.
# 1 "<stdin>"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "<stdin>"

The default library search path is only /usr/lib:

# cc -Xlinker --verbose  2>/dev/null | grep SEARCH | sed 's/SEARCH_DIR("=\?\([^"]\+\)"); */\1\n/g'  | grep -vE '^$'
SEARCH_DIR("/usr/lib");

So if you want to include other header file or link libraries in other directory, you need to specify it explicitly. For example:

# cc -I/usr/local/include -L/usr/local/lib ...

Reference:
Finding out what the GCC include path is;
How to print the ld(linker) search path.