https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65628
David Binderman <dcb314 at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Resolution|WORKSFORME |---
--- Comment #5 from David Binderman <dcb314 at hotmail dot com> ---
>David, in the future please use an --enable-checking=valgrind compiler
>for valgrind testing.
Righto. I tried a build of today's (20160620) gcc trunk with this flag you
recommend.
I got
==16199== Conditional jump or move depends on uninitialised value(s)
==16199== at 0x89001C: improve_allocation() (ira-color.c:2809)
==16199== by 0x893F3E: color_allocnos (ira-color.c:3140)
==16199== by 0x893F3E: color_pass(ira_loop_tree_node*) (ira-color.c:3249)
==16199== by 0x87D136: ira_traverse_loop_tree(bool, ira_loop_tree_node*,
void (*)(ira_loop_tree_node*), void (*)(ira_loop_tree_node*))
(ira-build.c:1780)
Source code is
if ((hregno = ALLOCNO_HARD_REGNO (a)) < 0)
So it looks to me like the problem is still there.
Configure line is
../src/trunk/configure --prefix=/home/dcb/gcc/results \
--disable-bootstrap \
--disable-multilib \
--disable-werror \
--enable-checking=valgrind \
--enable-languages=c,c++,fortran
And it looks like -O3 needs to be switched on in the build.
At the top level Makefile:
sed 's/-O2/-O3 -march=native -Wall -Wlogical-op/' < Makefile > Makefile.tmp
mv Makefile.tmp Makefile
Although I guess make target bootstrap-O3 would also provoke this valgrind
error.
