Locating libraries installed with MacPorts

[Ryan Schmidt]

> On Oct 5, 2016, at 5:21 PM, Mick Jordan <mick.jordan at oracle.com> wrote:
> 
> I have several libraries installed via MacPorts (that also exists in /usr/lib FWIW), e.g, libpcre and libz. I was rather surprised to see that these resolve to the MacPorts location,i.e., /opt/local/lib even though I am not passing -L/opt/local/lib to the link step. I thought this might be because I was using gcc to do the compilation/linking and that is also installed via MacPorts, but I get the same behavior when using clang. I added -Wl,-v to the link step and it lists the directories it is searching and /opt/local/lib is not included in the list. So my question is how is ld resolving to /opt/local/include. I have no environment variables such as LDFLAGS set, although /opt/local/bin is on my PATH.
> 
> I'm running MacPorts 2.3.4 in El Capitan.

I'm not able to reproduce this problem.


$ echo 'int main(void) { return 0; }' > main.c
$ clang main.c -lz
$ otool -L a.out 
a.out:
	/usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.5)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1226.10.1)