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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/98314] New: [11 Regression] Install fails with
 "install -C"
Date: Wed, 16 Dec 2020 09:49:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98314

            Bug ID: 98314
           Summary: [11 Regression] Install fails with "install -C"
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rsandifo at gcc dot gnu.org
                CC: nathan at gcc dot gnu.org
  Target Milestone: ---

It can be convenient to do:

  make install INSTALL=3D"/path/to/install -C"

to avoid touching files that haven't in fact changed (and so
avoid rebuilds of makefile rules that depend on the timestamps
of the installed tools).  That no longer works with c++tools:

/usr/bin/install -C -p g++-mapper-server
=E2=80=A6/libexec/gcc/aarch64-none-linux-gnu/11.0.0
/usr/bin/install: options --compare (-C) and --preserve-timestamps are mutu=
ally
exclusive
Try '/usr/bin/install --help' for more information.
Makefile:92: recipe for target 'install' failed

I guess the simplest fix is to drop the -p, but maybe that's
bad for other reasons.=