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Top Forums Programming Linker errors linking to .a files on OS X Post 302928590 by Don Cragun on Saturday 13th of December 2014 03:23:07 AM
Old 12-13-2014
Did you follow the MacPorts directions for uninstalling MacPorts, or did you just "rm" it?

I don't have any experience with MacPorts, but glancing through the on-line documentation it seems that MacPorts may change the target architecture to the port you were working on. That would explain the ld diagnostic:
Code:
ld: warning: ignoring file func.a, file was built for archive which is not the architecture being linked (x86_64): func.a
Undefined symbols for architecture x86_64:
  "_func", referenced from:
      _main in main.o

but I'm afraid I don't know how to help you correct the problem.

One possibility is that MacPorts might have installed alternative versions of gcc or ar in a directory in your PATH before the standard locations for those utilities. Does type ar gcc ld indicate any directory other than /usr/bin for any of those utilities? If it is something else, try:
Code:
/usr/bin/gcc -c func.c main.c
/usr/bin/ar -src func.a func.o
/usr/bin/gcc -o test main.o func.a

This User Gave Thanks to Don Cragun For This Post:
 

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XCODE-SELECT(1) 					    BSD General Commands Manual 					   XCODE-SELECT(1)

NAME
xcode-select - Manages the active developer directory for Xcode and BSD tools. SYNOPSIS
xcode-select [-h|--help] [-s|--switch <path>] [-p|--print-path] [-v|--version] DESCRIPTION
xcode-select controls the location of the developer directory used by xcrun(1), xcodebuild(1), cc(1), and other Xcode and BSD development tools. This also controls the locations that are searched for by man(1) for developer tool manpages. This allows you to easily switch between different versions of the Xcode tools and can be used to update the path to the Xcode if it is moved after installation. Usage When multiple Xcode applications are installed on a system (e.g. /Applications/Xcode.app, containing the latest Xcode, and /Applica- tions/Xcode-DP.app containing a developer preview) use xcode-select --switch path/to/Xcode.app to specify the Xcode that you wish to use for command line developer tools. After setting a developer directory, all of the xcode-select provided developer tool shims (see FILES) will automatically invoke the ver- sion of the tool inside the selected developer directory. Your own scripts, makefiles, and other tools can also use xcrun(1) to easily lookup tools inside the active developer directory, making it easy to switch them between different versions of the Xcode tools and allow- ing them to function properly on systems where the Xcode application has been installed to a non-default location. OPTIONS
-h, --help Prints the usage message. -s <path>, --switch <path> Sets the active developer directory to the given path, for example /Applications/Xcode-DP.app. This command must be run with supe- ruser permissions (see sudo(8)), and will affect all users on the system. To set the path without superuser permissions or only for the current shell session, use the DEVELOPER_DIR environment variable instead (see ENVIRONMENT). -p, --print-path Prints the path to the currently selected developer directory. This is useful for inspection, but scripts and other tools should use xcrun(1) to locate tool inside the active developer directory. -r, --reset Unsets any user-specified developer directory, so that the developer directory will be found via the default search mechanism. This command must be run with superuser permissions (see sudo(8)), and will affect all users on the system. -v, --version Prints xcode-select version information. --install Opens a user interface dialog to request automatic installation of the command line developer tools. ENVIRONMENT
DEVELOPER_DIR Overrides the active developer directory. When DEVELOPER_DIR is set, its value will be used instead of the system-wide active developer directory. Note that for historical reason, the developer directory is considered to be the Developer content directory inside the Xcode applica- tion (for example /Applications/Xcode.app/Contents/Developer). You can set the environment variable to either the actual Developer con- tents directory, or the Xcode application directory -- the xcode-select provided shims will automatically convert the environment vari- able into the full Developer content path. EXAMPLES
xcode-select --switch /Applications/Xcode.app/Contents/Developer Select /Applications/Xcode.app/Contents/Developer as the active developer directory. xcode-select --switch /Applications/Xcode.app As above, selects /Applications/Xcode.app/Contents/Developer as the active developer directory. The Developer content directory is auto- matically inferred by xcode-select. /usr/bin/xcodebuild Runs xcodebuild out of the active developer directory. /usr/bin/xcrun --find xcodebuild Use xcrun to locate xcodebuild inside the active developer directory. env DEVELOPER_DIR="/Applications/Xcode-DP.app" /usr/bin/xcodebuild Execute xcodebuild using an alternate developer directory. FILES
/usr/bin/xcrun Used to find or run arbitrary commands from the active developer directory. See xcrun(1) for more information. /usr/bin/agvtool /usr/bin/desdp /usr/bin/ibtool /usr/bin/ictool /usr/bin/instruments /usr/bin/iprofiler /usr/bin/opendiff /usr/bin/sdef /usr/bin/sdp /usr/bin/xcodebuild /usr/bin/xed Runs the matching Xcode tool from with the active developer directory. /usr/bin/BuildStrings /usr/bin/CpMac /usr/bin/DeRez /usr/bin/GetFileInfo /usr/bin/MergePef /usr/bin/MvMac /usr/bin/ResMerger /usr/bin/RezDet /usr/bin/RezWack /usr/bin/Rez /usr/bin/SetFile /usr/bin/SplitForks /usr/bin/UnRezWack /usr/bin/ar /usr/bin/as /usr/bin/asa /usr/bin/bison /usr/bin/c89 /usr/bin/c99 /usr/bin/clang++ /usr/bin/clang /usr/bin/cmpdylib /usr/bin/codesign_allocate /usr/bin/cpp /usr/bin/ctags /usr/bin/ctf_insert /usr/bin/dsymutil /usr/bin/dwarfdump /usr/bin/flex++ /usr/bin/flex /usr/bin/g++ /usr/bin/gatherheaderdoc /usr/bin/gcc /usr/bin/gcov /usr/bin/git-cvsserver /usr/bin/git-receive-pack /usr/bin/git-shell /usr/bin/git-upload-archive /usr/bin/git-upload-pack /usr/bin/git /usr/bin/gm4 /usr/bin/gnumake /usr/bin/gperf /usr/bin/hdxml2manxml /usr/bin/headerdoc2html /usr/bin/indent /usr/bin/install_name_tool /usr/bin/ld /usr/bin/lex /usr/bin/libtool /usr/bin/lipo /usr/bin/lldb /usr/bin/lorder /usr/bin/m4 /usr/bin/make /usr/bin/mig /usr/bin/mkdep /usr/bin/nasm /usr/bin/ndisasm /usr/bin/nm /usr/bin/nmedit /usr/bin/otool /usr/bin/pagestuff /usr/bin/ranlib /usr/bin/rebase /usr/bin/redo_prebinding /usr/bin/resolveLinks /usr/bin/rpcgen /usr/bin/segedit /usr/bin/size /usr/bin/strings /usr/bin/strip /usr/bin/svn /usr/bin/svnadmin /usr/bin/svndumpfilter /usr/bin/svnlook /usr/bin/svnserve /usr/bin/svnsync /usr/bin/svnversion /usr/bin/unifdef /usr/bin/unifdefall /usr/bin/xml2man /usr/bin/yacc Runs the matching BSD tool from with the active developer directory. SEE ALSO
xcrun(1) HISTORY
The xcode-select command first appeared in Xcode 3.0. Mac OS X July 30, 2013 XCODE-SELECT(1)
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