Re: Division clash between core and libgcc on ARM

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 13.11.2013 14:42, Colin Watson wrote:
>   ./configure --build=x86_64-linux-gnu --host=arm-linux-gnueabihf 
> --target=arm-linux-gnueabihf --with-platform=uboot
> 
> This fails with:
> 
>   arm-linux-gnueabihf-gcc -Wall -W -Wshadow -Wold-style-definition 
> -Wpointer-arith -Wundef -Wextra -Wattributes -Wchar-subscripts -Wcomment 
> -Wdeprecated-declarations -Wdisabled-optimization -Wdiv-by-zero 
> -Wendif-labels -Wfloat-equal -Wformat-extra-args -Wformat-security 
> -Wformat-y2k -Wimplicit -Wimplicit-function-declaration -Wimplicit-int 
> -Winit-self -Wint-to-pointer-cast -Winvalid-pch -Wmain -Wmissing-braces 
> -Wmissing-field-initializers -Wmissing-format-attribute -Wmultichar -Wnonnull 
> -Woverflow -Wparentheses -Wpointer-arith -Wpointer-to-int-cast -Wreturn-type 
> -Wsequence-point -Wshadow -Wsign-compare -Wstrict-aliasing -Wswitch 
> -Wtrigraphs -Wundef -Wunknown-pragmas -Wunused -Wunused-function 
> -Wunused-label -Wunused-parameter -Wunused-value  -Wunused-variable 
> -Wvariadic-macros -Wvolatile-register-var -Wwrite-strings -Wnested-externs 
> -Wstrict-prototypes -Wpointer-sign -Wcast-align -Werror -Wno-undef 
> -Wno-sign-compare -Wno-unused -Wno-unused-parameter -Wno-redundant-decls 
> -Wno-unreach
able-code -Wno-conversion -Wno-old-style-definition       -o grub-script-check 
util/grub_script_check-grub-script-check.o 
grub-core/kern/emu/grub_script_check-argp_common.o 
grub-core/osdep/grub_script_check-init.o  libgrubmods.a libgrubgcry.a 
libgrubkern.a grub-core/gnulib/libgnu.a
>   arm-linux-gnueabihf-gcc -Wall -W -Wshadow -Wold-style-definition 
> -Wpointer-arith -Wundef -Wextra -Wattributes -Wchar-subscripts -Wcomment 
> -Wdeprecated-declarations -Wdisabled-optimization -Wdiv-by-zero 
> -Wendif-labels -Wfloat-equal -Wformat-extra-args -Wformat-security 
> -Wformat-y2k -Wimplicit -Wimplicit-function-declaration -Wimplicit-int 
> -Winit-self -Wint-to-pointer-cast -Winvalid-pch -Wmain -Wmissing-braces 
> -Wmissing-field-initializers -Wmissing-format-attribute -Wmultichar -Wnonnull 
> -Woverflow -Wparentheses -Wpointer-arith -Wpointer-to-int-cast -Wreturn-type 
> -Wsequence-point -Wshadow -Wsign-compare -Wstrict-aliasing -Wswitch 
> -Wtrigraphs -Wundef -Wunknown-pragmas -Wunused -Wunused-function 
> -Wunused-label -Wunused-parameter -Wunused-value  -Wunused-variable 
> -Wvariadic-macros -Wvolatile-register-var -Wwrite-strings -Wnested-externs 
> -Wstrict-prototypes -Wpointer-sign -Wcast-align -Werror -Wno-undef 
> -Wno-sign-compare -Wno-unused -Wno-unused-parameter -Wno-redundant-decls 
> -Wno-unreach
able-code -Wno-conversion -Wno-old-style-definition       -o grub-editenv 
util/grub_editenv-grub-editenv.o util/grub_editenv-editenv.o 
grub-core/osdep/grub_editenv-init.o  libgrubmods.a libgrubgcry.a libgrubkern.a 
grub-core/gnulib/libgnu.a
>   /usr/lib/gcc-cross/arm-linux-gnueabihf/4.8/libgcc.a(_udivsi3.o): In 
> function `__aeabi_uidiv':
>   (.text+0x0): multiple definition of `__udivsi3'
>   libgrubkern.a(libgrubkern_a-misc.o):misc.c:(.text+0xa3c): first defined here
>   /usr/lib/gcc-cross/arm-linux-gnueabihf/4.8/libgcc.a(_udivsi3.o): In 
> function `__aeabi_uidiv':
>   (.text+0x0): multiple definition of `__aeabi_uidiv'
>   libgrubkern.a(libgrubkern_a-misc.o):misc.c:(.text+0xa3c): first defined here
>   collect2: error: ld returned 1 exit status
> 
> I don't think we should redirect divisions when building userspace
> utilities; it would be simpler to just let libgcc handle them in those
> cases.  How does this look?
> 
good
go ahead
>         * grub-core/kern/misc.c: Don't redirect divisions in the
>         GRUB_UTIL case.
> 
> diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c
> index 8b771a5..194e770 100644
> --- a/grub-core/kern/misc.c
> +++ b/grub-core/kern/misc.c
> @@ -596,6 +596,8 @@ grub_divmod64 (grub_uint64_t n, grub_uint64_t d, 
> grub_uint64_t *r)
>    return q;
>  }
>  
> +#ifndef GRUB_UTIL
> +
>  #if defined (__arm__)
>  
>  grub_uint32_t
> @@ -639,6 +641,8 @@ __umoddi3 (grub_uint64_t a, grub_uint64_t b)
>  
>  #endif
>  
> +#endif /* GRUB_UTIL */
> +
>  /* Convert a long long value to a string. This function avoids 64-bit
>     modular arithmetic or divisions.  */
>  static char *
> 
> Thanks,
>

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