[U-Boot] [PATCH 2/9] Fix strict-aliasing warning in dlmalloc

[Simon Glass]

Hi Wolfgang,

On Thu, Jan 5, 2012 at 10:48 PM, Wolfgang Denk <wd at denx.de> wrote:
> Dear Simon Glass,
>
> In message <1325822097-15227-3-git-send-email-sjg at chromium.org> you wrote:
>> This fixes the following warnings in dlmalloc seen with my gcc 4.6.
>
> Which exact version is this?
>
>> dlmalloc.c: In function 'malloc_bin_reloc':
>> dlmalloc.c:1493: warning: dereferencing pointer 'p' does break strict-aliasing rules
>> dlmalloc.c:1493: warning: dereferencing pointer 'p' does break strict-aliasing rules
>> dlmalloc.c:1490: note: initialized from here
>> dlmalloc.c:1493: note: initialized from here
>
> Can you please tell me at least one board configuration that throws
> this error (preferrably ppc, arm or mips) ?

I can't see one with those architectures. It does happen for others though:

$ (for b in $(cd ~/cosarm/buildall/logs.master.9a42098 && grep -l 1493
*ERR |sed 's/.ERR//'); do grep $b boards.cfg; done ) |awk '{print $2,
$1}'
avr32 atngw100
avr32 atstk1002
avr32 atstk1003
avr32 atstk1004
avr32 atstk1006
mips dbau1000
mips dbau1100
mips dbau1500
mips dbau1550
mips dbau1550_el
avr32 favr-32-ezkit
avr32 grasshopper
mips gth2
avr32 hammerhead
mips incaip
mips incaip_100MHz
mips incaip_133MHz
mips incaip_150MHz
m68k M54451EVB
m68k M54451EVB_stmicro
m68k M54451EVB_stmicro
m68k M54455EVB_a66
m68k M54455EVB
m68k M54455EVB_a66
m68k M54455EVB_i66
m68k M54455EVB_intel
m68k M54455EVB_stm33
m68k M54455EVB_i66
m68k M54455EVB_intel
m68k M54455EVB_stm33
m68k M5475AFE
m68k M5475BFE
m68k M5475CFE
m68k M5475DFE
m68k M5475EFE
m68k M5475FFE
m68k M5475GFE
m68k M5485AFE
m68k M5485BFE
m68k M5485CFE
m68k M5485DFE
m68k M5485EFE
m68k M5485FFE
m68k M5485GFE
m68k M5485HFE
avr32 mimc200
mips qemu_mips
mips vct_platinumavc
mips vct_platinumavc_onenand
mips vct_platinumavc_onenand_small
mips vct_platinumavc_small
mips vct_platinumavc_onenand
mips vct_platinumavc_onenand_small
mips vct_platinumavc_onenand_small
mips vct_platinumavc_small
mips vct_platinum
mips vct_platinumavc
mips vct_platinumavc_onenand
mips vct_platinumavc_onenand_small
mips vct_platinumavc_small
mips vct_platinum_onenand
mips vct_platinum_onenand_small
mips vct_platinum_small
mips vct_platinum_onenand
mips vct_platinum_onenand_small
mips vct_platinum_onenand_small
mips vct_platinum_small
mips vct_premium
mips vct_premium_onenand
mips vct_premium_onenand_small
mips vct_premium_small
mips vct_premium_onenand
mips vct_premium_onenand_small
mips vct_premium_onenand_small
mips vct_premium_small

Using built-in specs.
Target: mips-linux
Configured with: /home/tony/buildall/src/gcc/configure
--target=mips-linux --enable-targets=all
--prefix=/opt/cross/gcc-4.4.4-nolibc/mips-linux/ --enable-languages=c
--with-newlib --without-headers --enable-sjlj-exceptions
--with-system-libunwind --disable-nls --disable-threads
--disable-shared --disable-libmudflap --disable-libssp
--disable-libgomp --disable-decimal-float --enable-checking=release
--with-mpfr=/home/tony/buildall/src/sys
--with-gmp=/home/tony/buildall/src/sys
Thread model: single
gcc version 4.4.4 (GCC)

Using built-in specs.
Target: m68k-linux
Configured with: /home/tony/buildall/src/gcc/configure
--target=m68k-linux --enable-targets=all
--prefix=/opt/cross/gcc-4.4.4-nolibc/m68k-linux/ --enable-languages=c
--with-newlib --without-headers --enable-sjlj-exceptions
--with-system-libunwind --disable-nls --disable-threads
--disable-shared --disable-libmudflap --disable-libssp
--disable-libgomp --disable-decimal-float --enable-checking=release
--with-mpfr=/home/tony/buildall/src/sys
--with-gmp=/home/tony/buildall/src/sys
Thread model: single
gcc version 4.4.4 (GCC)

Using built-in specs.
Target: powerpc-linux
Configured with: /home/tony/buildall/src/gcc/configure
--target=powerpc-linux --enable-targets=all
--prefix=/opt/cross/gcc-4.4.4-nolibc/powerpc-linux/
--enable-languages=c --with-newlib --without-headers
--enable-sjlj-exceptions --with-system-libunwind --disable-nls
--disable-threads --disable-shared --disable-libmudflap
--disable-libssp --disable-libgomp --disable-decimal-float
--enable-checking=release --with-mpfr=/home/tony/buildall/src/sys
--with-gmp=/home/tony/buildall/src/sys
Thread model: single
gcc version 4.4.4 (GCC)