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Re: Warnings when running "bootstrap"

From: Paul Smith
Subject: Re: Warnings when running "bootstrap"
Date: Sun, 04 Sep 2022 21:39:05 -0400
User-agent: Evolution 3.44.4 (by Flathub.org)

On Mon, 2022-09-05 at 00:16 +0000, Bjarni Ingi Gislason via Bug reports
and discussion for GNU make wrote:
>   The compilation failed because I had an unclean git repository.
>   My compilation creates a lot of warnings, which could be reduced if
> the header files were fixed
>     131 [-Walloca]
>       7 [-Wformat=]
>       5 [-Wformat-nonliteral]
>       3 [-Wimplicit-fallthrough=]
>       2 [-Wmaybe-uninitialized]
>      21 [-Wmissing-prototypes]
>       3 [-Wpedantic]
>      32 [-Wredundant-decls]
>     221 [-Wstrict-prototypes]
>       2 [-Wunused-but-set-variable]
>      69 [-Wunused-parameter]
>       1 [-Wunused-variable]

That's interesting because I see zero warnings in my builds, on
GNU/Linux Ubuntu 20.04 with GCC 9.4.  If you wanted to send me the
output of a complete, clean build along with info about what OS and
compiler versions (you can send it directly to me with the output as an
attachment if you like) I can take a look.

When building the dist tarball none of these warnings will be enabled:
they are only enabled by default for maintainer builds and the Git repo
enables maintainer builds by default.

> /usr/bin/ld: src/misc.o: in function `get_tmppath':
> /home/bg/git/make/src/misc.c:562: warning: the use of `mktemp' is
> dangerous, better use `mkstemp' or `mkdtemp'
>   In misc.c the "HAVE_MKSTEMP" in not checked first so "mktemp" is
> selected as my system has both versions.

Unfortunately we need mktemp in some situations: we need to create a
FIFO using mkfifo() and that takes a pathname, and we can't have an
existing file there of course so mkstemp doesn't help us.

GNU make uses mkstemp when it can, but sometimes we need mktemp.

I considered using mkdtemp to create a temporary directory and create
all temporary files (and fifo's) in that directory, but I haven't done
so yet.  It would need to be deleted again as well.

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