https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67861
Bug ID: 67861
Summary: coreutils' wc.c:write_counts is miscompiled since
commit 7e3a76de7c496449b187c2688d958631cf21a944
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: blocker
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: jim at meyering dot net
Target Milestone: ---
Since the Oct 1 commit, 7e3a76de7c496449b187c2688d958631cf21a944,
coreutils's wc.c write_counts function is no longer compiled correctly,
yielding a "wc" command that prints only a newline, regardless of optimization
level.
To reproduce, I bootstrapped and installed gcc, then built coreutils from git,
then ran this:
echo | src/wc
and since that commit, it prints only a newline. Normally it would print this
24-byte sequence:
1 0 1
I confirmed that it is also reproduced when building from the latest released
tarball:
wget http://ftp.gnu.org/gnu/coreutils/coreutils-8.24.tar.xz
tar xf coreutils-8.24.tar.xz && cd coreutils-8.24 && ./configure && make
When built with a recently-bootstrapped gcc, wc malfunctions like this:
$ echo | src/wc|od -An -a
nl
