[BUILDROBOT] [Ada] error: alignment of array elements is greater than element size (was: [PATCH] GIMPLE store merging pass)

[Jan-Benedict Glaw]

Hi Kyrill!

On Mon, 2016-10-24 15:56:48 +0100, Kyrill Tkachov <kyrylo.tkachov@foss.arm.com> wrote:
> This is a slight update over [1] with Richard's feedback addressed.
> In terminate_all_aliasing_chains we now terminate the chain early if
> the destination is writing to a base offset by a variable amount.
> This avoids walking the store chain and performing more alias checks.
[...]
> Bootstrapped and tested on aarch64, arm, x86_64.

I'm getting build failures when Ada is enabled (ie. --disable-multilib
--enable-languages=all,ada,go), my build robot found it (see build
http://toolchain.lug-owl.de/buildbot/show_build_details.php?id=648226
for example):

[...]
/home/jbglaw/src/toolchain/build/./gcc/xgcc -B/home/jbglaw/src/toolchain/build/./gcc/ -B/home/jbglaw/src/toolchain/install/x86_64-pc-linux-gnu/bin/ -B/home/jbglaw/src/toolchain/install/x86_64-pc-linux-gnu/lib/ -isystem /home/jbglaw/src/toolchain/install/x86_64-pc-linux-gnu/include -isystem /home/jbglaw/src/toolchain/install/x86_64-pc-linux-gnu/sys-include    -c -g -O2  -fpic  -W -Wall -gnatpg -nostdinc   a-teioed.adb -o a-teioed.o
a-teioed.adb: In function ‘Ada.Text_Io.Editing.Format_Number’:
a-teioed.adb:127:4: error: alignment of array elements is greater than element size
a-teioed.adb:127:4: error: alignment of array elements is greater than element size
a-teioed.adb:127:4: error: alignment of array elements is greater than element size
a-teioed.adb:127:4: error: alignment of array elements is greater than element size
a-teioed.adb:127:4: error: alignment of array elements is greater than element size
a-teioed.adb:127:4: error: alignment of array elements is greater than element size
a-teioed.adb:127:4: error: alignment of array elements is greater than element size
a-teioed.adb:127:4: error: alignment of array elements is greater than element size
a-teioed.adb:127:4: error: alignment of array elements is greater than element size
a-teioed.adb: In function ‘Ada.Text_Io.Editing.To_Picture’:
a-teioed.adb:2724:4: error: alignment of array elements is greater than element size
a-teioed.adb: In function ‘Ada.Text_Io.Editing.Valid’:
a-teioed.adb:2751:4: error: alignment of array elements is greater than element size
make[7]: *** [a-teioed.o] Error 1
make[7]: Leaving directory `/home/jbglaw/src/toolchain/build/gcc/ada/rts'
make[6]: *** [gnatlib] Error 2
make[6]: Leaving directory `/home/jbglaw/src/toolchain/build/gcc/ada'
make[5]: *** [gnatlib-shared-default] Error 2
make[5]: Leaving directory `/home/jbglaw/src/toolchain/build/gcc/ada'
make[4]: *** [gnatlib-shared-dual] Error 2
make[4]: Leaving directory `/home/jbglaw/src/toolchain/build/gcc/ada'
make[3]: *** [gnatlib-shared] Error 2
make[3]: Leaving directory `/home/jbglaw/src/toolchain/build/gcc/ada'
make[2]: *** [gnatlib-shared] Error 2
make[2]: Leaving directory `/home/jbglaw/src/toolchain/build/x86_64-pc-linux-gnu/libada'
make[1]: *** [all-target-libada] Error 2
make[1]: Leaving directory `/home/jbglaw/src/toolchain/build'
make: *** [all] Error 2


I bisected it down to this commit, though I don't know if it caused or
uncovered the issue.

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw@lug-owl.de              +49-172-7608481
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