Hi Josef,
Wolf, Josef wrote:
I have a problem with HW/SW floating-point mismatches when I try to
compile uClinux-dist-20051014 with arm-linux-tools-20061213. The
problem
appears when compilation of the user directory (starting with boa)
starts
[ ... ]
ucfront-gcc arm-linux-gcc -Os -g
-fomit-frame-pointer -fno-common -fno-builtin -Wall -DEMBED -D__PIC__
-fpic -msingle-pic-base -Dlinux -D__linux__ -Dunix -D__uClinux__
-malignment-traps -DSYSLOGS_AT_EMERG -DBOA_TIME_LOG -c -o util.o
util.c
ucfront-gcc arm-linux-gcc -Wl,-elf2flt -D__PIC__ -fpic
-msingle-pic-base -o boa alias.o auth.o boa.o cgi.o cgi_header.o
config.o get.o hash.o globals.o log.o nls.o pipe.o queue.o read.o
request.o response.o signals.o timestamp.o util.o -lcrypt
/m/a/tmp/uclinux/install/arm-linux-tools-20061213/local/bin/../lib/gcc/a
rm-linux/3.4.4/../../../../arm-linux/bin/ld.real: ERROR: alias.o uses
hardware FP, whereas boa.gdb uses software FP
/m/a/tmp/uclinux/install/arm-linux-tools-20061213/local/bin/../lib/gcc/a
rm-linux/3.4.4/../../../../arm-linux/bin/ld.real: failed to merge target
specific data of file alias.o
[ ... ]
To solve this, I put CFLAGS += -msoft-float in
vendors/config/armnommu/config.arch. Then the error changes into:
[ ... ]
ucfront-gcc arm-linux-gcc -Os -g
-fomit-frame-pointer -fno-common -fno-builtin -Wall -DEMBED -D__PIC__
-fpic -msingle-pic-base -Dlinux -D__linux__ -Dunix -D__uClinux__
-msoft-float -malignment-traps -DSYSLOGS_AT_EMERG -DBOA_TIME_LOG -c
-o util.o util.c
ucfront-gcc arm-linux-gcc -Wl,-elf2flt -D__PIC__ -fpic
-msingle-pic-base -o boa alias.o auth.o boa.o cgi.o cgi_header.o
config.o get.o hash.o globals.o log.o nls.o pipe.o queue.o read.o
request.o response.o signals.o timestamp.o util.o -lcrypt
This final link line will need a "-msoft-float" as well.
Otherwise it will try to link against the wrong libgcc.a
/m/a/tmp/uclinux/install/arm-linux-tools-20061213/local/bin/../lib/gcc/a
rm-linux/3.4.4/../../../../arm-linux/bin/ld.real: ERROR:
/m/a/tmp/uclinux/install/arm-linux-tools-20061213/local/bin/../lib/gcc/a
rm-linux/3.4.4/libgcc.a(_udivsi3.o) uses hardware FP, whereas boa.gdb
uses software FP
/m/a/tmp/uclinux/install/arm-linux-tools-20061213/local/bin/../lib/gcc/a
rm-linux/3.4.4/../../../../arm-linux/bin/ld.real: failed to merge target
specific data of file
/m/a/tmp/uclinux/install/arm-linux-tools-20061213/local/bin/../lib/gcc/a
rm-linux/3.4.4/libgcc.a(_udivsi3.o)
[ ... ]
indicating that boa is linked against a library with HW-FP. I have
checked documentation of gcc and ld, but I can't find how to tell the
linker to link against a library with SW-FP. The linker don't seem
to like -msoft-float.
Can anybody tell me how to tell the linker against libraries with SW-FP?
If you are direct using the linker you would want "-EB". But if you are
linking through gcc then you just use "-msoft-float".
Regards
Greg
------------------------------------------------------------------------
Greg Ungerer -- Chief Software Dude EMAIL: [EMAIL PROTECTED]
Secure Computing Corporation PHONE: +61 7 3435 2888
825 Stanley St, FAX: +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia WEB: http://www.SnapGear.com
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