makeinfo errors building gcc from git

[J.W. Jagersma]

On 2018-07-24 21:45, Jonathan Wakely wrote:
>>> Add MAKEINFO=missing to your configure arguments to disable it.
>>
>> That didn't seem to work. Still seeing the same errors.
> 
> It should work. Did you re-configure from scratch?
> 
> You can also add it as an argument to make.

Yes, I wiped the build directory and reconfigured. Scrolling up I
noticed this line emitted by configure:

checking for makeinfo... /home/JW/gcc/missing makeinfo --split-size=5000000

And makeinfo is invoked the same way:

if [ xinfo = xinfo ]; then \
        /home/JW/gcc/missing makeinfo --split-size=5000000
--split-size=5000000 --no-split -I . -I ../../gcc/gcc/doc \
                -I ../../gcc/gcc/doc/include -o doc/cpp.info
../../gcc/gcc/doc/cpp.texi; \
fi
Unescaped left brace in regex is deprecated here (and will be fatal in
Perl 5.32), passed through in regex; marked by <-- HERE in
m/^\s+@([[:alnum:]][[:alnum:]\-]*)({ <-- HERE })?\s*/ at
/usr/share/texinfo/Texinfo/Parser.pm line 5599.
Unescaped left brace in regex is deprecated here (and will be fatal in
Perl 5.32), passed through in regex; marked by <-- HERE in
m/^\s+@([[:alnum:]][[:alnum:]\-]*)({ <-- HERE
})?\s*(\@(c|comment)((\@|\s+).*)?)?/ at
/usr/share/texinfo/Texinfo/Parser.pm line 5603.
../../gcc/gcc/doc/cpp.texi:4362: table requires an argument: the
formatter for @item
../../gcc/gcc/doc/cppopts.texi:493: table requires an argument: the
formatter for @item

(I only just noticed those regex warnings, maybe my texinfo or perl
needs updating...)
Passing MAKEINFO=missing to make doesn't work either:

if [ xinfo = xinfo ]; then \
        missing --split-size=5000000 --split-size=5000000 --no-split -I
. -I ../../gcc/gcc/doc \
                -I ../../gcc/gcc/doc/include -o doc/cpp.info
../../gcc/gcc/doc/cpp.texi; \
fi
/bin/sh: line 1: missing: command not found

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