Re: Soft Float is not being reported

["Dave" <dave at cc0 dot net>]

> > The real solution would be building gcc with multilib support, so it
> > builds three separate versions (i.e. FPA hardfloat, FPA softfloat and
> > VFP softfloat) of libgcc and the other runtimes, but I've never
> > understood how to do this with glibc...  It doesn't seem to have
> > multilib support.


# /opt/crosstool/bin/arm-linux-objdump -p
/opt/crosstool/arm-linux/lib/libc.so.6
[...]
private flags = 602: [APCS-32] [VFP float format] [software FP] [has entry
point]


#/opt/crosstool/bin/arm-linux-objdump -p
/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/libgcc.a
[...]
_eprintf.oS:     file format elf32-bigarm
private flags = 600: [APCS-32] [VFP float format] [software FP]
_bb.oS:     file format elf32-bigarm
private flags = 600: [APCS-32] [VFP float format] [software FP]
__gcc_bcmp.oS:     file format elf32-bigarm
private flags = 600: [APCS-32] [VFP float format] [software FP]


# /opt/crosstool/bin/arm-linux-gcc -o float float.c
# /opt/crosstool/bin/arm-linux-objdump -p float
[...]
private flags = 602: [APCS-32] [VFP float format] [software FP] [has entry
point]


# /opt/crosstool/bin/arm-linux-gcc -o float float.c -msoft-float
/opt/crosstool/bin/arm-linux-gcc -o float float.c -msoft-float
/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/../../../../arm-linux/bin/ld:
ERROR: /tmp/ccYarrF0.o uses FPA instructions, whereas float does not
/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/../../../../arm-linux/bin/ld:
failed to merge target specific data of file /tmp/ccYarrF0.o
collect2: ld returned 1 exit status

Hmm....

# /opt/crosstool/bin/arm-linux-gcc -o float float.c -msoft-float -###
Reading specs from /opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/specs
Configured with:
/usr/src/crosstool-0.28-rc25/build/arm-linux/gcc-3.3.3-glibc-2.2.5/gcc-3.3.3
/configure --target=arm-linux --host=i686-host_pc-linux-gnu --prefix=/opt/cr
osstool --nfp --without-fp --with-cpu=xscale --with-softfloat-support=intern
al --with-inhibit-libc --with-headers=/opt/crosstool/arm-linux/include --wit
h-local-prefix=/opt/crosstool/arm-linux --disable-nls --enable-threads=posix
 --enable-symvers=gnu --enable-__cxa_atexit --enable-languages=c,c++ --enabl
e-shared --enable-c99 --enable-long-long
Thread model: posix
gcc version 3.3.3
 "/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/cc1" "-quiet" "-D__GNUC__=3"
"-D__GNUC_MINOR__=3" "-D__GNUC_PATCHLEVEL__=3" "-D__ARM_ARCH_5TE__"
"-D__XSCALE__" "float.c" "-quiet" "-dumpbase" "float.c" "-msoft-float"
"-auxbase" "float" "-o" "/tmp/cc4i2pGg.s"
 "/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/../../../../arm-linux/bin/as"
"--traditional-format" "-mfpu=softfpa" "-mcpu=xscale" "-mfpu=softfpa" "-o"
"/tmp/cc0SLYfn.o" "/tmp/cc4i2pGg.s"
 "/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/collect2" "-dynamic-linker"
"/lib/ld-linux.so.2" "-X" "-m" "armelf_linux" "-p" "-o" "float"
"/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/../../../../arm-linux/lib/crt1.o
"
"/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/../../../../arm-linux/lib/crti.o
" "/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/crtbegin.o"
"-L/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3"
"-L/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/../../../../arm-linux/lib"
"/tmp/cc0SLYfn.o" "-lgcc" "-lgcc_eh" "-lc" "-lgcc" "-lgcc_eh"
"/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/crtend.o"
"/opt/crosstool/lib/gcc-lib/arm-linux/3.3.3/../../../../arm-linux/lib/crtn.o
"















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