gcc-3.3.3 and softfloat?

[Dan Kegel]

Steven Scholz wrote:
> I am using gcc-3.3.3-glibc-2.3.2-linux-2.6.8 from crosstool-0.28-rc37 
> for ARM9.
> 
> export KERNELCONFIG=`pwd`/arm.config
> export TARGET=arm-softfloat-linux-gnu
> export TARGET_CFLAGS="-O"
> export GCC_EXTRA_CONFIG="--with-float=soft"
> export GLIBC_EXTRA_CONFIG="--without-fp"
> export BINUTILS_DIR=binutils-2.15
> export GCC_DIR=gcc-3.3.3
> export GLIBC_DIR=glibc-2.3.2
> export LINUX_DIR=linux-2.6.8
> export GLIBCTHREADS_FILENAME=glibc-linuxthreads-2.3.2
> 
> Do I have to pass -msoft-float when compiling applications with floating 
> point operations? Or is this flag on by default?

I dunno.  You might need to ask the arm-linux folks, who
are better steeped in this than the crossgcc folks...

> How do I know if floating point operations are realy handle by the 
> softfloat functions and not by the kernel emulator?

Do an objdump of your code and see if it's using floating-point
instructions?
- Dan


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