Re: Trying to build scratch/igc: cannot find MPS library

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 29 Dec 2024 15:39:54 +0000
> From:  Alexis Purslane via "Emacs development discussions." <emacs-devel@gnu.org>
> 
>     I'm trying to build the scratch/igc branch of Emacs in order to see if I
>     can help bug hunt, and I'm running into a problem. I apologize if
>     this turns out to be a dumb mistake, I don't often build things from
>     source.
> 
>     I'm following README-IGC's instructions to build the debug version
>     of MPS from source to the letter, except I've decided to place
>     mps-artifacts in the mps directory, and the mps directory inside my
>     emacs source directory, in order to avoid cluttering up my home
>     directory. So the commands I'm running are:
> 
>         $ # starting in the emacs directory, /home/alexispurslane/Development/scratch/emacs/
>         $ git clone https://github.com/Ravenbrook/mps.git
>         $ cd mps/code
>         $ gcc -O0 -g -DCONFIG_VAR_COOL -c mps.c -o mps-debug.o
>         $ ar rvs libmps-debug.a mps-debug.o
>         $ cp libmps-debug.a ../mps-artifacts
>         $ cd ../..
>         $ ./configure CPPFLAGS=-I/home/alexispurslane/Development/scratch/emacs/mps/mps-artifacts LDFLAGS=-I/home/alexispurslane/Development/scratch/emacs/mps/mps-artifacts --with-cairo --with-dbus --with-gif --with-gpm=no --with-harfbuzz --with-jpeg --with-modules --with-native-compilation=aot --with-png --with-rsvg --with-sqlite3 --with-tiff --with-tree-sitter --with-webp --with-x-toolkit=gtk3 --with-xinput2 --with-xpm --with-mps=debug --enable-checking=igc_debug
> 
>     When I try to do this, configure reports this error:
> 
>         checking for mps.h... yes
>         checking for mps_arena_create in -lmps... no
>         configure: error: The MPS library libmps is missing
> 
>     This seems odd to me not only because I'm providing it with a
>     directory that has what it's looking for, but that it appears the
>     CPPFLAGS(?) are working, since it can find mps.h, but not the
>     LDFLAGS.

Your LDFLAGS are incorrect: the option letter is -L, not -I.


>     P.S. There's a type in the README-IGC debug build instructions: it
>     says `mpc.c' instead of `mps.c' in the GCC command.

Thanks, fixed.