Date: Wed, 4 May 2022 12:53:17 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: John Baldwin <jhb@freebsd.org> Cc: Ed Maste <emaste@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Profiled libraries on freebsd-current Message-ID: <YnLZraesrXQJdgy3@troutmask.apl.washington.edu> In-Reply-To: <80e38cf3-0d53-fce6-76e6-936c47d95c91@FreeBSD.org> References: <Ymt%2BICLaQPxx2knx@troutmask.apl.washington.edu> <CAPyFy2CuSFd7zm8BvrWYDv%2BEgM0Ryz-bxwWNzUEMEkm0fruokA@mail.gmail.com> <Ym1XE9QSSvIy/4uo@troutmask.apl.washington.edu> <CAPyFy2AcKcT3NmpA5cs0WG4B7gPCJwdax%2BPp02YHEQBmJ10ZtQ@mail.gmail.com> <Ym6tJn60RmqQVsrv@troutmask.apl.washington.edu> <CAPyFy2DJp6ycnqsZMH%2B094B%2BhykYrF4T5PN3qHm9qogVkQm9dQ@mail.gmail.com> <YnAWvEvQaNgzTFYn@troutmask.apl.washington.edu> <80e38cf3-0d53-fce6-76e6-936c47d95c91@FreeBSD.org>
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On Wed, May 04, 2022 at 11:12:55AM -0700, John Baldwin wrote: > On 5/2/22 10:37 AM, Steve Kargl wrote: > > On Mon, May 02, 2022 at 12:32:25PM -0400, Ed Maste wrote: > > > On Sun, 1 May 2022 at 11:54, Steve Kargl > > > <sgk@troutmask.apl.washington.edu> wrote: > > > > > > > > diff --git a/gcc/config/freebsd-spec.h b/gcc/config/freebsd-spec.h > > > > index 594487829b5..1e8ab2e1827 100644 > > > > --- a/gcc/config/freebsd-spec.h > > > > +++ b/gcc/config/freebsd-spec.h > > > > @@ -93,14 +93,22 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see > > > > (similar to the default, except no -lg, and no -p). */ > > > > > > > > #ifdef FBSD_NO_THREADS > > > > > > I wonder if we can simplify things now, and remove this > > > `FBSD_NO_THREADS` case. I didn't see anything similar in other GCC > > > targets I looked at. > > > > That I don't know. FBSD_NO_THREADS is defined in freebsd-nthr.h. > > In fact, it's the only thing in that header (except copyright > > broilerplate). freebsd-nthr.h only appears in config.gcc and > > seems to only get added to the build if someone runs configure > > with --enable-threads=no. Looking at my last config.log for > > gcc trunk, I see "Thread model: posix", which appears to be > > the default case or if someone does --enable-threads=yes or > > --enable-threads=posix. So, I suppose it comes down to > > two questions: (1) is libpthread.* available on all supported > > targets and versions? (2) does anyone build gcc without > > threads support? > > libpthread is available on all supported architectures on all > supported versions. libthr has been the default threading library > since 7.0 and the only supported library since 8.0. In GDB I just > assume libthr style threads, and I think GCC can safely do the > same. > I don't know the entire FreeBSD ecosystem. Do people use FreeBSD on embedded systems (e.g., nanobsd) where libthr may be stripped out? Thus, --enable-threads=no is needed. gcc/config/freebsd-nthr.h was committed on May 22, 2001. There have been no changes to the file other than cosmetic ones (e.g., updating copyright notice). gcc/config/freebsd-spec.h has had a number of changes. Someone with a better understanding of the spec file will need to clean that up. -- Steve
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