From: Ken Brown <kbrown@cornell.edu>
To: cygwin-devel <cygwin-developers@cygwin.com>
Subject: automake issue
Date: Wed, 20 Oct 2021 16:58:41 -0400 [thread overview]
Message-ID: <620fad2f-74b0-4a39-45e0-bb2acc00129e@cornell.edu> (raw)
I was debugging with what I thought was an unoptimized build of cygwin1.dll
(with -O0 in CXXFLAGS), but then I discovered that malloc.cc was actually
compiled with -O3. This is because of the following snippet from
winsup/cygwin/Makefile.am:
# If an optimization level is explicitly set in CXXFLAGS, set -O3 for these files
# XXX: this seems to assume it's not -O0?
#
# (the indentation here prevents automake trying to process this as an automake
# conditional)
ifneq "${filter -O%,$(CXXFLAGS)}" ""
malloc_CFLAGS=-O3
sync_CFLAGS=-O3
endif
I thought I could fix this by changing the snippet to
ifneq "${filter -O%,$(CXXFLAGS)}" ""
ifeq "${filter -O0,$(CXXFLAGS)}" ""
malloc_CFLAGS=-O3
sync_CFLAGS=-O3
endif
endif
but this didn't work. After running winsup/autogen.sh,
winsup/cygwin/Makefile.in contained
malloc_CFLAGS = -O3
sync_CFLAGS = -O3
unconditionally.
So in spite of the comment above about indentation, it seems that the
conditional is being treated as an automake conditional.
Does anyone know how to fix this so that -O0 really produces an unoptimized build?
Ken
next reply other threads:[~2021-10-20 20:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-20 20:58 Ken Brown [this message]
2021-10-21 10:48 ` Corinna Vinschen
2021-10-21 13:08 ` Jon Turney
2021-10-21 19:33 ` Ken Brown
2021-10-22 8:44 ` Corinna Vinschen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=620fad2f-74b0-4a39-45e0-bb2acc00129e@cornell.edu \
--to=kbrown@cornell.edu \
--cc=cygwin-developers@cygwin.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).