http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56533
--- Comment #2 from Matthijs Kooijman <matthijs at stdin dot nl> 2013-03-05
12:55:47 UTC ---
+ /usr/bin/avr-gcc -v -mmcu=atmega328p -Os -flto -fwhole-program realmain.o
main.a
Using built-in specs.
COLLECT_GCC=/usr/bin/avr-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/avr/4.7.2/lto-wrapper
Target: avr
Configured with: ../src/configure -v --enable-languages=c,c++ --prefix=/usr/lib
--infodir=/usr/share/info --mandir=/usr/share/man --bindir=/usr/bin
--libexecdir=/usr/lib --libdir=/usr/lib --enable-shared --with-system-zlib
--enable-long-long --enable-nls --without-included-gettext --disable-libssp
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=avr
Thread model: single
gcc version 4.7.2 (GCC)
COMPILER_PATH=/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/../../../avr/bin/
LIBRARY_PATH=/usr/lib/gcc/avr/4.7.2/avr5/:/usr/lib/gcc/avr/4.7.2/../../../avr/lib/avr5/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/4.7.2/../../../avr/lib/
COLLECT_GCC_OPTIONS='-v' '-mmcu=atmega328p' '-Os' '-flto' '-fwhole-program'
/usr/lib/gcc/avr/4.7.2/collect2 -flto -m avr5 -Tdata 0x800100
/usr/lib/gcc/avr/4.7.2/../../../avr/lib/avr5/crtm328p.o
-L/usr/lib/gcc/avr/4.7.2/avr5 -L/usr/lib/gcc/avr/4.7.2/../../../avr/lib/avr5
-L/usr/lib/gcc/avr/4.7.2 -L/usr/lib/gcc/avr/4.7.2/../../../avr/lib realmain.o
main.a -lgcc -lc -lgcc
/usr/bin/avr-gcc @/tmp/ccYrSTvi.args
Using built-in specs.
COLLECT_GCC=/usr/bin/avr-gcc
Target: avr
Configured with: ../src/configure -v --enable-languages=c,c++ --prefix=/usr/lib
--infodir=/usr/share/info --mandir=/usr/share/man --bindir=/usr/bin
--libexecdir=/usr/lib --libdir=/usr/lib --enable-shared --with-system-zlib
--enable-long-long --enable-nls --without-included-gettext --disable-libssp
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=avr
Thread model: single
gcc version 4.7.2 (GCC)
COLLECT_GCC_OPTIONS='-c' '-v' '-mmcu=atmega328p' '-Os' '-fwhole-program'
'-fltrans-output-list=/tmp/ccZEu3t3.ltrans.out' '-fwpa'
/usr/lib/gcc/avr/4.7.2/lto1 -quiet -dumpbase realmain.o -mmcu=atmega328p
-auxbase realmain -Os -version -fwhole-program
-fltrans-output-list=/tmp/ccZEu3t3.ltrans.out -fwpa @/tmp/ccOsOe32
GNU GIMPLE (GCC) version 4.7.2 (avr)
compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version
3.1.0-p10, MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU GIMPLE (GCC) version 4.7.2 (avr)
compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version
3.1.0-p10, MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
COMPILER_PATH=/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/../../../avr/bin/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/../../../avr/bin/
LIBRARY_PATH=/usr/lib/gcc/avr/4.7.2/avr5/:/usr/lib/gcc/avr/4.7.2/../../../avr/lib/avr5/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/4.7.2/../../../avr/lib/
COLLECT_GCC_OPTIONS='-c' '-v' '-mmcu=atmega328p' '-Os' '-fwhole-program'
'-fltrans-output-list=/tmp/ccZEu3t3.ltrans.out' '-fwpa'
/usr/bin/avr-gcc @/tmp/ccoysJBM.args
Using built-in specs.
COLLECT_GCC=/usr/bin/avr-gcc
Target: avr
Configured with: ../src/configure -v --enable-languages=c,c++ --prefix=/usr/lib
--infodir=/usr/share/info --mandir=/usr/share/man --bindir=/usr/bin
--libexecdir=/usr/lib --libdir=/usr/lib --enable-shared --with-system-zlib
--enable-long-long --enable-nls --without-included-gettext --disable-libssp
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=avr
Thread model: single
gcc version 4.7.2 (GCC)
COLLECT_GCC_OPTIONS='-c' '-v' '-mmcu=atmega328p' '-Os' '-fwhole-program'
'-fltrans-output-list=/tmp/ccZEu3t3.ltrans.out' '-fltrans' '-o'
'/tmp/ccZEu3t3.ltrans0.ltrans.o'
/usr/lib/gcc/avr/4.7.2/lto1 -quiet -dumpbase ccZEu3t3.ltrans0.o
-mmcu=atmega328p -auxbase-strip /tmp/ccZEu3t3.ltrans0.ltrans.o -Os -version
-fwhole-program -fltrans-output-list=/tmp/ccZEu3t3.ltrans.out -fltrans
@/tmp/ccAudUT3 -o /tmp/ccyDScYi.s
GNU GIMPLE (GCC) version 4.7.2 (avr)
compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version
3.1.0-p10, MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU GIMPLE (GCC) version 4.7.2 (avr)
compiled by GNU C version 4.7.2, GMP version 5.0.5, MPFR version
3.1.0-p10, MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
COLLECT_GCC_OPTIONS='-c' '-v' '-mmcu=atmega328p' '-Os' '-fwhole-program'
'-fltrans-output-list=/tmp/ccZEu3t3.ltrans.out' '-fltrans' '-o'
'/tmp/ccZEu3t3.ltrans0.ltrans.o'
/usr/lib/gcc/avr/4.7.2/../../../avr/bin/as -mmcu=atmega328p -mno-skip-bug -o
/tmp/ccZEu3t3.ltrans0.ltrans.o /tmp/ccyDScYi.s
COMPILER_PATH=/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/../../../avr/bin/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.7.2/../../../avr/bin/
LIBRARY_PATH=/usr/lib/gcc/avr/4.7.2/avr5/:/usr/lib/gcc/avr/4.7.2/../../../avr/lib/avr5/:/usr/lib/gcc/avr/4.7.2/:/usr/lib/gcc/avr/4.7.2/../../../avr/lib/
COLLECT_GCC_OPTIONS='-c' '-v' '-mmcu=atmega328p' '-Os' '-fwhole-program'
'-fltrans-output-list=/tmp/ccZEu3t3.ltrans.out' '-fltrans' '-o'
'/tmp/ccZEu3t3.ltrans0.ltrans.o'
main.a(main.o): In function `main':
main.c:(.text+0x8): undefined reference to `realmain'
collect2: error: ld returned 1 exit status
