Re: armv5b-softfloat with VFP

["J. Scott Merritt" <alsauser at pragmasoft dot com>]

Sure :)  Results of "-c -v" from a simple "hello world" program using the new compiler are shown below.
I must have really messed up somewhere - I note that it is sending "-mfpu-softfpa" to the assembler TWICE !
Thanks for the help !

Best, Scott.


Reading specs from /aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/lib/gcc/arm-vfp-linux/3.4.3/specs
Configured with: /aux/arm/kwork/crosstool-0.30/build/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/gcc-3.4.3/configure --target=arm-vfp-linux --host=i686-host_pc-linux-gnu --prefix=/aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4 --with-float=soft --with-cpu=xscale --enable-cxx-flags=-mcpu=xscale --with-headers=/aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/arm-vfp-linux/include --with-local-prefix=/aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/arm-vfp-linux --disable-nls --enable-threads=posix --enable-symvers=gnu --enable-__cxa_atexit --enable-languages=c,c++ --enable-shared --enable-c99 --enable-long-long
Thread model: posix
gcc version 3.4.3
 /aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/libexec/gcc/arm-vfp-linux/3.4.3/cc1 -quiet -v -D__ARM_ARCH_5TE__ -D__XSCALE__ hello.c -quiet -dumpbase hello.c -mcpu=xscale -msoft-float -auxbase hello -version -o /tmp/ccEbKNbp.s
#include "..." search starts here:
#include <...> search starts here:
 /aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/include
 /aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/lib/gcc/arm-vfp-linux/3.4.3/include
 /aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/lib/gcc/arm-vfp-linux/3.4.3/../../../../arm-vfp-linux/sys-include
 /aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/lib/gcc/arm-vfp-linux/3.4.3/../../../../arm-vfp-linux/include
End of search list.
GNU C version 3.4.3 (arm-vfp-linux)
	compiled by GNU C version 3.2.2 20030222 (Red Hat Linux 3.2.2-5).
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
 /aux/arm/vfp/arm-vfp-linux/gcc-3.4.3-glibc-2.3.4/lib/gcc/arm-vfp-linux/3.4.3/../../../../arm-vfp-linux/bin/as -mcpu=xscale -mfpu=softfpa -mfpu=softfpa -o hello.o /tmp/ccEbKNbp.s


On Mon, 11 Apr 2005 15:45:58 +0200
Dimitry Andric <dimitry@andric.com> wrote:

> On 2005-04-11 at 01:33:14 J. Scott Merritt wrote:
> 
> > I applied the arm-softfloat.patch from your website and performed a
> > crosstool build for gcc-3.4.3-glibc-2.3.4.  I believe the VFP format
> > is being used, because an fprintf of a floating number produces the
> > *huge* result shown elsewhere,
> 
> Yes, make sure you also patch glibc with either glibc-vfp.patch from
> my site, or if you have a recent crosstool, it's also included as
> glibc-fp-byteorder.patch.
> 
> 
> > however, even with the softfloat patch it looks as though the VFP
> > format flag is not getting set in the ELF header (should be 0x600
> > and its still at 0x200).
> 
> > - Should the softfloat patch update the ELF header to report
> > VFP format or is this still missing ?
> 
> The softfloat patch modifies the flags that are passed by gcc to the
> assembler (SUBTARGET_ASM_FLOAT_SPEC) to:
> 
> 1) -mfpu=softvfp, if you give gcc no floating point options
> 2) -mfpu=softfpa, if you give gcc the -msoft-float option
> 3) -mfpu=fpa,     if you give gcc the -mhard-float option
> 
> Can you show us output of arm-linux-gcc -v -c, with just a random .c
> file?
> 
> 
> > - I assume that I need to also copy the glibc-vfp.patch forward
> > to glibc-2.3.4 to solve the fprintf 1.0 problem ?
> 
> Yes.
> 

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