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Re: build libgcc for i486 with msoft-float failed


On Sat, Oct 5, 2013 at 11:02 PM, Reid M <reid3759@gmail.com> wrote:
> I was trying to build cross gcc and libgcc based on gcc-4.8 for target
> i486 without floating point support.

Do you really have that hardware platform--80486 without 80487?


> 2. After I comment out the inline assembly to avoid error 1, I could
> get a libgcc for i486 version. There's some undefined soft-float
> function as the following. The source code of corresponding function
> are existed in libgcc but they aren't included in libgcc.a.
> out/target/product/obj/STATIC_LIBRARIES/libc_common_intermediates/libc_common.a(time.o):
> In function `clock_now':
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__floatsidf'
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__floatsidf'
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__muldf3'
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__adddf3'
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__fixdfsi'
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__floatsidf'
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__floatsidf'
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__muldf3'
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__adddf3'
> /home/reid/android/android-4.2.1_r1/bionic/libc/unistd/time.c:53:
> undefined reference to `__fixdfsi

You should try adding t-softfp to tmake_file in config.host.  I don't
know if that is all you will need but it will take you one step
further.  See the targets in config.host that use t-softfp.  Note that
you don't want i386/t-softfp, or at least not just that--that is just
an RTEMS patch and doesn't do most of what is needed.

Ian


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