too strict a check in aclocal.m4 causes build failures

[Ximin Luo]

never mind, it looks like aclocal.m4 is autogenerated. sorry, I'm not that
familiar with GNU autotools. I will go report the bug to them instead.

X

On 21/12/10 03:09, Ximin Luo wrote:
> I have a core2 system, and have been trying to compile GMP 5.0.1 optimised for
> other x86 CPUs, by doing (e.g.)
> 
> $ ./configure --host=pentium4-$(./config.guess | cut -d- -f2-)
> 
> However, these fail with an obscure error message about `link -dump -symbols`
> (see snippet 1). After a convoluted path of debugging, I've worked out that the
> cause is ./configure not detecting the presence of "/usr/bin/nm -B", in the
> case where $build != $host.
> 
> The responsible line is in aclocal.m4:
> 3190   if test -n "$ac_tool_prefix" && test "$build" = "$host"; then
> 
> If you remove the second test, either here and running autoconf, or in
> ./configure directly, the build works fine.
> 
> Test code is available at [1]. Note the WORKAROUND on line 232 - removing it
> will cause builds such as
> 
> $ ./build-all-multi.sh pentium4
> 
> to fail (assuming you're on a core2).
> 
> Hopefully my proposed fix doesn't break anything.
> 
> Ximin
> 
> [1]
> https://github.com/freenet/contrib-staging/blob/master/NativeBigInteger/build-all-multi.sh
> 
> ----> snippet 1 <----
> 
> checking if globals are prefixed by underscore... link: invalid option -- 'd'
> Try `link --help' for more information.
> unknown
> configure: WARNING: +----------------------------------------------------------
> configure: WARNING: | Cannot determine global symbol prefix.
> configure: WARNING: | link -dump -symbols output doesn't contain a global data
> symbol.
> configure: WARNING: | Will proceed with no underscore.
> configure: WARNING: | If this is wrong then you'll get link errors referring
> configure: WARNING: | to ___gmpn_add_n (note three underscores).
> configure: WARNING: | In this case do a fresh build with an override,
> configure: WARNING: |     ./configure gmp_cv_asm_underscore=yes
> configure: WARNING: +----------------------------------------------------------
> checking how to switch to read-only data section... 	.section	.rodata
> checking for assembler .type directive... .type	$1,@$2
> checking for assembler .size directive... .size	$1,$2
> checking for assembler local label prefix... configure: WARNING: "link -dump
> -symbols" failure
> configure: WARNING: cannot determine local label, using default L
> L
> checking for assembler byte directive... .byte
> checking how to define a 32-bit word... link: invalid option -- 'd'
> Try `link --help' for more information.
> link: invalid option -- 'd'
> Try `link --help' for more information.
> configure: error: cannot determine how to define a 32-bit word
> 
> Failed to configure for libjbigi-linux-pentium4; maybe it isn't supported on
> your build environment.
> 
> Error building libjbigi-linux-pentium4!
> 
> 
> 


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