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Full Discussion: Linker errors linking to .a files on OS X
Top Forums Programming Linker errors linking to .a files on OS X Post 302928583 by Don Cragun on Saturday 13th of December 2014 12:55:14 AM
Old 12-13-2014
When I run those commands with the source files you provided on OS X Yosemite 10.10.1, I don't get any diagnostic messages from ld, and when I run ./test afterwards, I get:
Code:
Before func
In func

as I would expect from that code. Please look at the contents of your archive with:
Code:
ar -tv func.a

It should show something like:
Code:
rw-r--r--     501/20           24 Dec 12 21:41 2014 __.SYMDEF SORTED
rw-r--r--     501/20          816 Dec 12 21:41 2014 func.o

If the __.SYMDEF SORTED entry isn't present, try:
Code:
ar -s func.a

which should create (or recreate) the symbol table for the archive.
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT DEBIAN

fltk-config

fltk-config(1)						      General Commands Manual						    fltk-config(1)

NAME

       fltk-config - script to get information about the installed version of fltk.

SYNOPSIS

       fltk-config  [  --prefix  [=DIR]  ] [ --exec-prefix [=DIR] ] [ --version ] [ --api-version ] [ --use-gl ] [ --use-images ] [ --use-glut ] [
       --cc ] [ --cxx ] [ --cflags ] [ --cxxflags ] [ --ldflags ] [ --ldstaticflags ] [ --libs ] [ -Dname[=value] ] [ -g ] [ --compile program.cxx
       ]

DESCRIPTION

       fltk-config is a utility script that can be used to get information about the current version of FLTK that is installed on the system, what
       compiler and linker options to use when building FLTK-based applications, and to build simple FLTK applications.

       The following options are supported:

       --api-version
	    Displays the current FLTK API version number, e.g. "1.1".

       --cc

       --cxx
	    Displays the C/C++ compiler that was used to compile FLTK.

       --cflags

       --cxxflags
	    Displays the C/C++ compiler options to use when compiling source files that use FLTK.

       --compile program.cxx
	    Compiles the source file program.cxx into program.	This option implies "--post program".

       -g
	    Enables debugging information when compiling with the --compile option.

       --ldflags
	    Displays the linker options to use when linking a FLTK application.

       --ldstaticflags
	    Displays the linker options to use when linking a FLTK application to the static FLTK libraries.

       --libs
	    Displays the full path to the FLTK library files, to be used for dependency checking.

       --use-gl
	    Enables OpenGL support.

       --use-glut
	    Enables GLUT support.

       --use-images
	    Enables image file support.

       --version
	    Displays the current FLTK version number, e.g. "1.1.0".

SEE ALSO

       fluid(1), fltk(3)
       FLTK Programming Manual
       FLTK Web Site, http://www.fltk.org/

AUTHORS

       Bill Spitzak and others.

6 February 2007 						Fast Light Tool Kit						    fltk-config(1)
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