mame: modify build instructions and dependencies

[cmitu]

Made a few tweaks to optimize bulding MAME:

• bump the RAM requirements, to ensure there's enough memory to complete the build.
• don't build the MAME debugger on non-desktop platforms, since it would need a windowing environment to run anyway. This allows us to remove the QT dependencies and debugger compilation steps.
• use system's flac/zstd libraries (more could be added)
• tell the linker to remove debugging info, so the binaries don't need a 'strip' call afterwards
• synchronize the optimization level in MAME with RetroPie's optimization flags (-O2), to avoid extra optimization during compiling (MAME defaults to '-O3').

[dankcushions]

one thing I never got around to playing with, but it seemed mame's performance via x is (was?) way better than direct to framebuffer (at least on pi4). i am interested to see if adjusting the script to launch it in an xsession improves anything. not a request, just throwing that out there ;)

[cmitu]

@dankcushions just modify emulators.cfg for the mame/arcade system(s) and add an entry with:

mame-x11 = XINIT-WM:/opt/retropie/emulators/mame/mame %BASENAME%

then you can choose to launch MAME via X11 from the runcommand launch menu. Make sure you're running a recent version of RetroPie and install the xorg matchbox-window-manager packages before.

[roslof]

I updated the script (synced to 46063658) and tried to build lr-mame. Received this new breaking error near the end of the build:

In file included from ../../../../../src/frontend/mame/ui/pluginopt.h:15,
                 from ../../../../../src/frontend/mame/luaengine.cpp:16:
../../../../../src/frontend/mame/ui/menu.h: In member function ‘std::pair<float, float> ui::menu::get_text_dimensions(std::string_view, float, float, float, ui::text_layout::text_justify, ui::text_layout::word_wrapping)’:
../../../../../src/frontend/mame/ui/menu.h:244:9: note: parameter passing for argument of type ‘std::pair<float, float>’ when C++17 is enabled changed to match C++14 in GCC 10.1
  244 |         {
      |         ^
{standard input}: Assembler messages:
{standard input}:276601: Warning: end of file not at end of a line; newline inserted
{standard input}:276602: Warning: zero assumed for missing expression
{standard input}:276188: Error: invalid operands (*UND* and .gcc_except_table sections) for `-'
g++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
make[2]: *** [emu.make:2066: ../../../../libretro/obj/libretro/src/emu/emumem_aspace.o] Error 1

Hope this is helpful

[cmitu]

Hope this is helpful

Not really, since this PR is un-related to lr-mame/lr-mess.

[roslof]

Not really, since this PR is un-related to lr-mame/lr-mess.

Ugh, yes. I was completely unhelpful. My apologies for not paying attention to the actual affected script. Was in-part confused because lr-mame also requires additional swap to build on 4GB Pis.