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Re: [PATCH 1/2] Add powerpc little-endian (ppc64le) flags

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: [PATCH 1/2] Add powerpc little-endian (ppc64le) flags
Date: Thu, 16 Jul 2015 21:05:07 +0200
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On 16.07.2015 20:55, Andrei Borzenkov wrote:
> В Wed, 15 Jul 2015 19:42:39 +0200
> Vladimir 'φ-coder/phcoder' Serbinenko <address@hidden> пишет:
>>> It is possible to compile using "--target=powerpc -Wl,-EB" - this works
>>> on all three ppc, ppc64 and ppc64le, but this means hardcoding GNU ld
>>> dependency.
>> Thanks for this info.
>> See attached patch
> Test has to come before asm tests (so that we are sure to compile
> for the right target).
> But real problem is that -Wl,-EB has to be added to TARGET_LDFLAGS only
Yes, discovered it already and updated the patch
>  [  106s] configure:24950: clang -c -v -Wall -W -Wshadow
>  -Wpointer-arith -Wundef -Wchar-subscripts -Wcomment 
> -Wdeprecated-declarations -Wdisabled-optimization -Wdiv-by-zero -Wfloat-equal 
> -Wformat-extra-args -Wformat-security -Wformat-y2k -Wimplicit 
> -Wimplicit-function-declaration -Wimplicit-int -Wmain -Wmissing-braces 
> -Wmissing-format-attribute -Wmultichar -Wparentheses -Wreturn-type 
> -Wsequence-point -Wshadow -Wsign-compare -Wswitch -Wtrigraphs 
> -Wunknown-pragmas -Wunused -Wunused-function -Wunused-label 
> -Wunused-parameter -Wunused-value  -Wunused-variable -Wwrite-strings 
> -Wnested-externs -Wstrict-prototypes -g -Wredundant-decls 
> -Wmissing-prototypes -Wmissing-declarations -Wcast-align  -Wextra 
> -Wattributes -Wendif-labels -Winit-self -Wint-to-pointer-cast -Winvalid-pch 
> -Wmissing-field-initializers -Wnonnull -Woverflow -Wvla -Wpointer-to-int-cast 
> -Wstrict-aliasing -Wvariadic-macros -Wvolatile-register-var -Wpointer-sign 
> -Wmissing-include-dirs -Wmissing-prototypes -Wmissing-declarations -Wformat=2 
> -target powerpc -Wl,-EB -m32 -msoft-float -W
conftest.c >&5 [  106s] clang version 3.6.1 (tags/RELEASE_361/final 238133)
> [  106s] Target: powerpc
> [  106s] Thread model: posix
> [  106s] clang-3.6: error: -Wl,-EB: 'linker' input unused
>>> So I'd rather try to produce patch for proper support of
>>> -mbig-endian/-mlittle-endian (including passing it onto gcc linker) and
>>> until then declared clang on ppc64le having limited support (i.e.
>>> support for automatic detection by configure).
>> I agree that this is a better approach in long term. But if we can get
>> some support for current tools with little work (see patch) and without
>> risks of breaking other tools I see no reason not to go for it in short term

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