Re: [MPS test] `void-function igc--collect` on scratch/igc branch (commit: `42731228d2`)

[Eli Zaretskii <eliz@gnu.org>]

> From: Eval Exec <execvy@gmail.com>
> Date: Mon, 5 Aug 2024 21:48:24 +0800
> 
> Then I build emacs by:
> ```bash
> make extraclean
> ./autogen.sh \
>   && ./configure \
>   --prefix=$(realpath ../emacs-build)\
>   --with-mps \
>   --with-imagemagick \
>   --with-modules --with-x-toolkit=lucid --without-compress-install \
>   --without-toolkit-scroll-bars --with-native-compilation  --with-mailutils\
>   --with-tree-sitter --with-xinput2  \
>   --with-dbus  --with-native-compilation=aot \
>   --with-file-notification=inotify\
>   && make -j20 install
> ```
> 
> After build success, I notice there is an interactive command:
> `igc-collect`, so I `M-x igc-collect`, then I got:
> 
> ```elisp
> Debugger entered--Lisp error: (void-function igc--collect)
>   igc--collect()
>   igc-collect()
>   funcall-interactively(igc-collect)
>   command-execute(igc-collect record)
>   #<subr execute-extended-command>(nil "igc-collect" nil)
>   ad-Advice-execute-extended-command(#<subr execute-extended-command>
> nil "igc-collect" nil)
>   apply(ad-Advice-execute-extended-command #<subr
> execute-extended-command> (nil "igc-collect" nil))
>   execute-extended-command(nil "igc-collect" nil)
>   funcall-interactively(execute-extended-command nil "igc-collect" nil)
>   command-execute(execute-extended-command)
> ```
> 
> 
> Is this expected? Did I miss something when I building Emacs?

You need to make sure the configure script finds the MPS library,
otherwise it will build without the new GC.