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From: "Stefan Ring (stefanrin AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date: Sat, 5 Oct 2024 06:37:41 +0200
Message-ID: <CAAxjCExA-MVJNGXNBXPGmxuON_YGZtMUJb7xjaG0c+JB-yxLhQ@mail.gmail.com>
Subject: Weird redirection behavior/bug in bash 4.4.28
To: djgpp AT delorie DOT com
Content-Type: text/plain; charset="UTF-8"
Reply-To: djgpp AT delorie DOT com

I have been able to rebuild DJGPP gcc from the source zip files
(gcc*s.zip) on Windows Vista for quite a while now and recently wanted
to find out if it also works on Windows XP. The first stumbling block
was that for some reason, bash kept crashing almost immediately. It
was the old version 2.05b, which works perfectly fine on Vista, but
not on XP, so I just swapped it for the most recent binary release,
bsh4428, and tried to go ahead. After a while, the build would fail
with libtool complaining "`atomic.lo' is not a valid libtool object",
which was surprising, as the file looked perfectly normal (inside
libbacktrace/):

--- %< ---
# atomic.lo - a libtool object file
# Generated by libtool (GNU libtool 1.3134 2009-11-29) 2.2.7a
#
# Please DO NOT delete this file!
# It is necessary for linking the library.

# Name of the PIC object.
pic_object=none

# Name of the non-PIC object
non_pic_object='atomic.o'
--- %< ---

After downgrading bash to 4.2.53, this started to work mysteriously,
which sent me on a longish journey trying to build and patch interim
bash versions (which is horrible and proved not to be useful anyway)
and ultimately found that inside libtool, something like this short
script is used, and somehow the DOS line endings in atomic.lo confuse
bash:

set -o posix
exec <atomic.lo
while read a; do
echo $a
done

With the broken version 4.4, this is what comes out:

--- %< ---
# atomic.lo - a libtool object file
Generated by libtool (GNU libtool 1.3134 2009-11-29) 2.2.7a

se DO NOT delete this file!
is necessary for linking the library.
ame of the PIC object.
bject=none
Name of the non-PIC object
n_pic_object='atomic.o'
--- %< ---

So it loses a few characters or even the newline itself on all lines
but the first one. This is what makes libtool unhappy, because it
specifically looks for the pattern "# Generated by [...]". The same
thing does not happen for a file with Unix line endings.