GCC toolchain with HW floating-point enabled

[Davide Pippa <thepyper at gmail dot com>]

Hi!

I've recently updated my ecos CVS, and made a new rom using the new hw
floating point support (I'm compiling for TWR-K70F120M). The rom
builds fine, but the application I used to work with complains during
compilation:

make all
Building file: ../main.cpp
Invoking: ARM devkitPro Windows GCC C++ Compiler
arm-eabi-g++ -I"H:/Works/Arm/PyIde/roms/01009_TWR-K70F120M/include"
-O0 -Wall -Wa,-adhlns="main.o.lst" -fno-exceptions -fno-rtti -c
-fmessage-length=0 -MMD -MP -MF"main.d" -MT"main.d" -mcpu=cortex-m4
-mthumb -mfloat-abi=hard -mfpu=vfpv4-d16 -g3 -gdwarf-2 -o "main.o"
"../main.cpp"
../main.cpp: In function ‘void cyg_user_start()’:
../main.cpp:33:30: warning: deprecated conversion from string constant
to ‘char*’ [-Wwrite-strings]
../main.cpp: In function ‘void main_thread_entry(cyg_addrword_t)’:
../main.cpp:80:87: warning: deprecated conversion from string constant
to ‘char*’ [-Wwrite-strings]
../main.cpp: In function ‘void udpecho_thread_entry(void*)’:
../main.cpp:107:20: warning: unused variable ‘port’ [-Wunused-variable]
../main.cpp:110:9: warning: variable ‘j’ set but not used
[-Wunused-but-set-variable]
Finished building: ../main.cpp

Building target: demo1.elf
Invoking: ARM devkitPro Windows GCC C++ Linker
arm-eabi-g++ -T"target.ld" -nostdlib
-LH:/Works/Arm/PyIde/roms/01009_TWR-K70F120M/lib -Wl,-Map,demo1.map
-mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=vfpv4-d16 -g3 -gdwarf-2
-o "demo1.elf"  ./main.o
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/../../../../arm-eabi/bin/ld:
error: demo1.elf uses VFP register arguments,
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/libgcc.a(bpabi.o)
does not
makefile:59: recipe for target `demo1.elf' failed
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/../../../../arm-eabi/bin/ld:
failed to merge target specific data of file
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/libgcc.a(bpabi.o)
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/../../../../arm-eabi/bin/ld:
error: demo1.elf uses VFP register arguments,
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/libgcc.a(_divdi3.o)
does not
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/../../../../arm-eabi/bin/ld:
failed to merge target specific data of file
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/libgcc.a(_divdi3.o)
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/../../../../arm-eabi/bin/ld:
error: demo1.elf uses VFP register arguments,
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/libgcc.a(_udivdi3.o)
does not
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/../../../../arm-eabi/bin/ld:
failed to merge target specific data of file
/cygdrive/h/Works/Arm/PyIde/tools/gnutools/arm-eabi/bin/../lib/gcc/arm-eabi/4.6.3/libgcc.a(_udivdi3.o)
collect2: ld returned 1 exit status
make: *** [demo1.elf] Error 1

The application is built with HW fpu enabled, but it seems that
libgcc.a is not floating-point aware (sort-of?)... is there any new
release of the 4.6.3 gcc toolchain built with floating point support?
Or is there any guide to rebuild the 4.6.3 gcc toolchain myself?

Thanks!

Pyper.

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