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[bug #58743] siggetmask should be called with no arguments.

From: Paul D. Smith
Subject: [bug #58743] siggetmask should be called with no arguments.
Date: Fri, 10 Jul 2020 15:06:22 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36

Follow-up Comment #4, bug #58743 (project make):

That flag is only used in maintenance mode, which has a number of requirements
on the system AND ALSO adds a bunch of debugging code that will unquestionably
slow down your GNU make program.

I strongly advise that you not use maintenance mode to build any version you
want to use for anything other than developing GNU make itself.  The
README.git file explains:

NOTE! This method builds GNU make in "maintainer mode".  Make programs built
      in this mode it will be slower, possibly MUCH slower: there are various
      sanity checks enabled.  Further this mode assumes a modern GCC, GNU
      libc, and well-formed system headers and enables a high level of
      warnings AND enables -Werror to turn warnings into failures.

      If you want to build from Git with "maintainer mode" disabled, add
      "MAKE_MAINTAINER_MODE=" to the make command line.  If you want to turn
      off the extra warning flags, add "MAKE_CFLAGS=" to the make command

      For example:
        $ ./configure
        $ make install

I'm not sure I want to update the configure.ac to test for the -C option
specifically and avoid it if not available, since it's only used in maintainer


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