Tried compiling sixpair on PowerPC Mac. Even with libusb-legacy include files... all versions of GCC refuses borks at the linking stage.
PowerBook-de-Rafael:Desktop rafaelfrequiao$ ARCH=ppc gcc-mp-6 -v -o sixpair sixpair.c -I /opt/local/include/libusb-legacy/ -L /opt/local/lib/libusb-legacy/
Using built-in specs.
COLLECT_GCC=gcc-mp-6
COLLECT_LTO_WRAPPER=/opt/local/libexec/gcc/ppc-apple-darwin9/6.5.0/lto-wrapper
Target: ppc-apple-darwin9
Configured with: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_gcc6/gcc6/work/gcc-6.5.0/configure --prefix=/opt/local --build=ppc-apple-darwin9 --enable-languages=c,c++,objc,obj-c++,lto,fortran --libdir=/opt/local/lib/gcc6 --includedir=/opt/local/include/gcc6 --infodir=/opt/local/share/info --mandir=/opt/local/share/man --datarootdir=/opt/local/share/gcc-6 --with-local-prefix=/opt/local --with-system-zlib --disable-nls --program-suffix=-mp-6 --with-gxx-include-dir=/opt/local/include/gcc6/c++/ --with-gmp=/opt/local --with-mpfr=/opt/local --with-mpc=/opt/local --with-isl=/opt/local --enable-stage1-checking --disable-multilib --enable-lto --enable-libstdcxx-time --with-build-config=bootstrap-debug --with-as=/opt/local/bin/as --with-ld=/opt/local/bin/ld --with-ar=/opt/local/bin/ar --with-bugurl=https://trac.macports.org/newticket --disable-tls --with-pkgversion='MacPorts gcc6 6.5.0_4'
Thread model: posix
gcc version 6.5.0 (MacPorts gcc6 6.5.0_4)
COLLECT_GCC_OPTIONS='-v' '-o' 'sixpair' '-I' '/opt/local/include/libusb-legacy/' '-L/opt/local/lib/libusb-legacy/' '-mmacosx-version-min=10.5.8' '-asm_macosx_version_min=10.5'
/opt/local/libexec/gcc/ppc-apple-darwin9/6.5.0/cc1 -quiet -v -I /opt/local/include/libusb-legacy/ -D__DYNAMIC__ sixpair.c -fPIC -quiet -dumpbase sixpair.c -mmacosx-version-min=10.5.8 -auxbase sixpair -version -o /var/folders/mW/mWpvRFBZEyeuV1mrjrcE8k+++TI/-Tmp-//cccZCycR.s
GNU C11 (MacPorts gcc6 6.5.0_4) version 6.5.0 (ppc-apple-darwin9)
compiled by GNU C version 6.5.0, GMP version 6.1.2, MPFR version 4.0.2, MPC version 1.1.0, isl version 0.15
GGC heuristics: --param ggc-min-expand=82 --param ggc-min-heapsize=98304
ignoring nonexistent directory "/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0/../../../../../ppc-apple-darwin9/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/local/include/libusb-legacy/
/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0/include
/opt/local/include
/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0/include-fixed
/usr/include
/System/Library/Frameworks
/Library/Frameworks
End of search list.
GNU C11 (MacPorts gcc6 6.5.0_4) version 6.5.0 (ppc-apple-darwin9)
compiled by GNU C version 6.5.0, GMP version 6.1.2, MPFR version 4.0.2, MPC version 1.1.0, isl version 0.15
GGC heuristics: --param ggc-min-expand=82 --param ggc-min-heapsize=98304
Compiler executable checksum: 42c1082229f2bccabf4f5dfb1508940c
sixpair.c: In function 'process_device':
sixpair.c:64:3: warning: implicit declaration of function 'usb_detach_kernel_driver_np' [-Wimplicit-function-declaration]
usb_detach_kernel_driver_np(devh, itfnum);
^~~~~~~~~~~~~~~~~~~~~~~~~~~
COLLECT_GCC_OPTIONS='-v' '-o' 'sixpair' '-I' '/opt/local/include/libusb-legacy/' '-L/opt/local/lib/libusb-legacy/' '-mmacosx-version-min=10.5.8'
/opt/local/bin/as -v -I /opt/local/include/libusb-legacy/ -arch ppc -o /var/folders/mW/mWpvRFBZEyeuV1mrjrcE8k+++TI/-Tmp-//cc4Qh4jd.o /var/folders/mW/mWpvRFBZEyeuV1mrjrcE8k+++TI/-Tmp-//cccZCycR.s
Apple Inc version cctools-921, GNU assembler version 1.38
COMPILER_PATH=/opt/local/libexec/gcc/ppc-apple-darwin9/6.5.0/:/opt/local/libexec/gcc/ppc-apple-darwin9/6.5.0/:/opt/local/libexec/gcc/ppc-apple-darwin9/:/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0/:/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/
LIBRARY_PATH=/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0/:/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0/../../../
COLLECT_GCC_OPTIONS='-v' '-o' 'sixpair' '-I' '/opt/local/include/libusb-legacy/' '-L/opt/local/lib/libusb-legacy/' '-mmacosx-version-min=10.5.8'
/opt/local/libexec/gcc/ppc-apple-darwin9/6.5.0/collect2 -dynamic -arch ppc -macosx_version_min 10.5.8 -weak_reference_mismatches non-weak -o sixpair -lcrt1.10.5.o -L/opt/local/lib/libusb-legacy/ -L/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0 -L/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0/../../.. /var/folders/mW/mWpvRFBZEyeuV1mrjrcE8k+++TI/-Tmp-//cc4Qh4jd.o -lgcc_s.10.5 -lgcc_ext.10.5 -lgcc -lSystemStubs -lSystem -v
collect2 version 6.5.0
/opt/local/bin/ld -dynamic -arch ppc -macosx_version_min 10.5.8 -weak_reference_mismatches non-weak -o sixpair -lcrt1.10.5.o -L/opt/local/lib/libusb-legacy/ -L/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0 -L/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0/../../.. /var/folders/mW/mWpvRFBZEyeuV1mrjrcE8k+++TI/-Tmp-//cc4Qh4jd.o -lgcc_s.10.5 -lgcc_ext.10.5 -lgcc -lSystemStubs -lSystem -v
@(#)PROGRAM:ld PROJECT:ld64-127.2
configured to support archs: i386 x86_64 ppc ppc64 armv6 armv7
Library search paths:
/opt/local/lib/libusb-legacy/
/opt/local/lib/gcc6/gcc/ppc-apple-darwin9/6.5.0
/opt/local/lib/gcc6
/usr/lib
/usr/local/lib
Framework search paths:
/Library/Frameworks/
/System/Library/Frameworks/
Undefined symbols for architecture ppc:
"_usb_control_msg", referenced from:
_show_master in cc4Qh4jd.o
_set_master in cc4Qh4jd.o
"_usb_open", referenced from:
_process_device in cc4Qh4jd.o
"_usb_detach_kernel_driver_np", referenced from:
_process_device in cc4Qh4jd.o
"_usb_claim_interface", referenced from:
_process_device in cc4Qh4jd.o
"_usb_close", referenced from:
_process_device in cc4Qh4jd.o
"_usb_init", referenced from:
_main in cc4Qh4jd.o
"_usb_find_busses", referenced from:
_main in cc4Qh4jd.o
"_usb_find_devices", referenced from:
_main in cc4Qh4jd.o
"_usb_get_busses", referenced from:
_main in cc4Qh4jd.o
ld: symbol(s) not found for architecture ppc
collect2: error: ld returned 1 exit status