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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100152] [10/11/12 Regression] used caller-saved register
 not preserved across a call.
Date: Sun, 09 May 2021 07:25:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100152

--- Comment #48 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to lucier from comment #47)
> I downloaded

> [Bradleys-Mac-mini:~/programs/gcc/gcc-mainline] lucier% git log -1 --onel=
ine
> 2254b3233b5 (HEAD -> master, origin/trunk, origin/master, origin/HEAD) PR
> middle-end/100325 - missing warning with -O0 on sprintf overflow with
> pointer plus offset
>=20
> configured with
>=20
>  ../../gcc-mainline/configure --prefix=3D/usr/local/gcc-mainline
> --with-sysroot=3D/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk
>=20
> and "make; make -k check".=20

Which, presumably, succeeded [repeatably?] (also presumably with some faili=
ng
tests, since we don't have a clean testsuite on macOS).

I then applied the patch, configured, "make; make
> -k check" and the make check always stops with
>=20
> <stuff removed>
> Running
> /Users/lucier/programs/gcc/gcc-mainline/libstdc++-v3/testsuite/libstdc++-=
dg/
> conformance.exp ...
> WARNING: program timed out.

There's not quite enough information here - it would be useful to know which
test(s) timed out - running "make check -jN -k" (where N is some sensible
number for the cores on your machine) would help since that will then print
which tests timeout.

> Sorry, I don't know what's going on.

The proposed patch is experimental - I haven't had an opportunity to test it
across the range of platforms - it might be incomplete or incorrect.=