Tryint to use LTO with a canadian cross gcc I get the following error
message:
e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/bin/ld.exe:
unrecognized option '-plugin'
It's binutils 2.21 configured
Configured with: ../../source/binutils-2.21/configure --target=avr
--prefix=/local/gnu/install/gcc-4.6-mingw32 --host=i586-mingw32
--build=i686-linux-gnu
So maybe I misconfigured binutils? There is
http://sourceware.org/PR12742
that addresses similar issue with binutils 2.20 without a hint. Is LTO
supported in binutild 2.21 out of the box?
As canadian cross I used gcc from 4.6-branch (SVN 175201) configured
with same --prefix, --host, --target and --build:
e:/WinAVR/4.6.1/bin/avr-gcc -mmcu=atmega168 -flto -Wl,-Map,morpheus.map
-Wl,--cref -v -Wl,-v -o morpheus.elf frac8-asm.o parith-16-asm.o
int-to-string.o sound.o text.o textmenu.o uhr.o menu.o main.o
asteroids.o parith-16.o snake.o snake-onpixel.o snake-data.o testbild.o
schoner.o dcf-oszi.o vektor-zeichen-data.o vektor-zeichen.o bresenham.o
dac.o frame.o morse.o time.o mem-check.o uart.o rc5-pd.o countdown.o
dcf77.o frac8.o
Using built-in specs.
COLLECT_GCC=e:/WinAVR/4.6.1/bin/avr-gcc
COLLECT_LTO_WRAPPER=e:/winavr/4.6.1/bin/../libexec/gcc/avr/4.6.1/lto-wrapper.exe
Target: avr
Configured with: ../../gcc.gnu.org/gcc-4_6-branch/configure --target=avr
--prefix=/local/gnu/install/gcc-4.6-mingw32 --host=i586-mingw32
--build=i686-linux-gnu --enable-languages=c,c++ --disable-nls
--disable-shared --with-dwarf2
Thread model: single
gcc version 4.6.1 20110620 (prerelease) (GCC)
COMPILER_PATH=e:/winavr/4.6.1/bin/../libexec/gcc/avr/4.6.1/;e:/winavr/4.6.1/bin/../libexec/gcc/;e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/bin/
LIBRARY_PATH=e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/avr5/;e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/lib/avr5/;e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/;e:/winavr/4.6.1/bin/../lib/gcc/;e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/lib/
COLLECT_GCC_OPTIONS='-mmcu=atmega168' '-flto' '-v' '-o' 'morpheus.elf'
e:/winavr/4.6.1/bin/../libexec/gcc/avr/4.6.1/collect2.exe -plugin
e:/winavr/4.6.1/bin/../libexec/gcc/avr/4.6.1/liblto_plugin-0.dll
-plugin-opt=e:/winavr/4.6.1/bin/../libexec/gcc/avr/4.6.1/lto-wrapper.exe
-plugin-opt=-fresolution=c:\Temp\cc0oaaaa.res
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -flto -m avr5 -Tdata 0x800100 -o
morpheus.elf
e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/lib/avr5/crtm168.o
-Le:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/avr5
-Le:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/lib/avr5
-Le:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1
-Le:/winavr/4.6.1/bin/../lib/gcc
-Le:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/lib -Map
morpheus.map --cref -v frac8-asm.o parith-16-asm.o int-to-string.o
sound.o text.o textmenu.o uhr.o menu.o main.o asteroids.o parith-16.o
snake.o snake-onpixel.o snake-data.o testbild.o schoner.o dcf-oszi.o
vektor-zeichen-data.o vektor-zeichen.o bresenham.o dac.o frame.o morse.o
time.o mem-check.o uart.o rc5-pd.o countdown.o dcf77.o frac8.o -lgcc -lc
-lgcc
collect2 version 4.6.1 20110620 (prerelease) (GNU assembler syntax)
e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/bin/ld.exe
-plugin e:/winavr/4.6.1/bin/../libexec/gcc/avr/4.6.1/liblto_plugin-0.dll
-plugin-opt=e:/winavr/4.6.1/bin/../libexec/gcc/avr/4.6.1/lto-wrapper.exe
-plugin-opt=-fresolution=c:\Temp\cc0oaaaa.res
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -m avr5 -Tdata 0x800100 -o morpheus.elf
e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/lib/avr5/crtm168.o
-Le:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/avr5
-Le:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/lib/avr5
-Le:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1
-Le:/winavr/4.6.1/bin/../lib/gcc
-Le:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/lib -Map
morpheus.map --cref -v frac8-asm.o parith-16-asm.o int-to-string.o
sound.o text.o textmenu.o uhr.o menu.o main.o asteroids.o parith-16.o
snake.o snake-onpixel.o snake-data.o testbild.o schoner.o dcf-oszi.o
vektor-zeichen-data.o vektor-zeichen.o bresenham.o dac.o frame.o morse.o
time.o mem-check.o uart.o rc5-pd.o countdown.o dcf77.o frac8.o -lgcc -lc
-lgcc
e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/bin/ld.exe:
unrecognized option '-plugin'
e:/winavr/4.6.1/bin/../lib/gcc/avr/4.6.1/../../../../avr/bin/ld.exe: use
the --help option for usage information
collect2: ld returned 1 exit status
make: *** [morpheus.elf] Error 1
The gcc source tree does not contain libelf;
http://gcc.gnu.org/install/prerequisites.html
do no more mention libelf. However, that site is for current upcombing
gcc 4.7 and I could not find a similar site for older releases of gcc.
Also I could not find 4.6 prerequesties in 4.6 Internals. Is there a
site like http://gcc.gnu.org/install for older/antique versions of GCC?
Building 4.6 ordinary cross still works with libelf-0.8.12, but canadian
cross build crash because some Solaris code is entered during libelf build.
In the ChangeLogs I found that support for libelf has been removed, so I
guess it's simply not needed any more?
Is LTO supposed to work on MinGW or do I need explicit --enable-lto?
Yet another question: The above run generated temorary file names like
c:\Temp\cc0oaaaa.res which is a bit annoying when comparing testsuite
.log files. Is thare a way so that different rund generate same file
name(s)?
Then I read somewhere that LTO does not work together with -g. Is that
still true for 4.6/4.7 or did I ran in some documentation-rot?
Thanks for your patience.
Johann
