pkg-config quirk

[Balthazar]

Hi!
After years of benefiting from others' Q&A, I have finally joined this site. This is my first posting here. Thank you!

The terminal output below speaks for itself to the informed. Or read following paragraph for descriptive explanation.

Recently, in the development of a glib app - a GIMP plug-in actually - I wrote a simple main.c tester using ANSI C. So, the object code apparently compiled just fine with glib-2.0 options; however, when I went to link-and-compile with the main.c code, the compiler referred to "undefined function: sqrt()" which I used in the glib code, but not the main.c. I found the culprit: missing '-L/usr/lib' and '-lm' - which I added manually. So, I took a look at the file "/usr/lib/pkgconfig/glib-2.0". I see the missing '-lm'. But, I cannot figure out why '-L/usr/lib' is missing!?


/~:> pkg-config --version
0.22
/~:> cat /usr/lib/pkgconfig/glib-2.0.pc
prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

glib_genmarshal=glib-genmarshal
gobject_query=gobject-query
glib_mkenums=glib-mkenums

Name: GLib
Description: C Utility Library
Version: 2.20.1
Libs: -L${libdir} -lglib-2.0
Libs.private:
Cflags: -I${includedir}/glib-2.0 -I${libdir}/glib-2.0/include
/~:> echo `pkg-config --cflags --libs glib-2.0`
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -lglib-2.0
/~:>


-R