Cannot compile lr-ppsspp (ffmpeg arc4random implicit declaration error)

memorylane

Hi, when compiling lr-ppsspp on a Raspberry pi 4b+ (aarch64), I get an error during linking:

/usr/bin/ld: ../ffmpeg/linux/aarch64/lib/libavformat.a(avienc.o): relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol `__stack_chk_guard@@GLIBC_2.17' which may bind externally can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: ../ffmpeg/linux/aarch64/lib/libavformat.a(avienc.o)(.text+0xc): unresolvable R_AARCH64_ADR_PREL_PG_HI21 relocation against symbol `__stack_chk_guard@@GLIBC_2.17'
/usr/bin/ld: final link failed: bad value

It's strange as in CMakeCache.txt I see

//Set to ON to generate the libretro target
LIBRETRO:BOOL=On

so that it should compile pic according to https://github.com/hrydgard/ppsspp/blob/9fe6338e3bf397f8a009a51a282c139dfa180eb6/CMakeLists.txt#L192

but I then see that there's some hackery going on with ffmpeg https://github.com/RetroPie/RetroPie-Setup/blob/master/scriptmodules/emulators/ppsspp.sh#L123

And then I tried to build that manually, and realized that there has been an earlier error

libavutil/random_seed.c: In function ‘av_get_random_seed’:
libavutil/random_seed.c:130:12: error: implicit declaration of function ‘arc4random’; did you mean ‘srandom’? [-Werror=implicit-function-declaration]
  130 |     return arc4random();
      |            ^~~~~~~~~~
      |            srandom
cc1: some warnings being treated as errors
make: *** [common.mak:60: libavutil/random_seed.o] Error 1
make: *** Waiting for unfinished jobs....

for some reason, the script continues from this...

After searching the internets, I found this related answer: https://stackoverflow.com/a/22187646

I don't know what's the correct solution, but I guess, turning off arc4random and using /dev/urandom instead will not cause problems, so in config.h I manually set

#define HAVE_ARC4RANDOM 0

to test it out. It worked, so I added

--- a/scriptmodules/emulators/ppsspp.sh
+++ b/scriptmodules/emulators/ppsspp.sh
@@ -101,6 +101,8 @@ function build_ffmpeg_ppsspp() {
         ${DEMUXERS} \
         ${MUXERS} \
         ${PARSERS}
+
+    sed -i "s/^#define HAVE_ARC4RANDOM 1/#define HAVE_ARC4RANDOM 0/" config.h
     make clean
     make install
 }

to make the install script work.

I am on unstable Debian

luigi@planet-retro:~/RetroPie-Setup $ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 12 (bookworm)
Release:        12
Codename:       bookworm

Could someone reproduce this problem, and what would be the best way to resolve this?

mitu

...
I am on unstable Debian

Since pre-release OSes may have newer compilers/libraries, there's the possibility they're not tested or supported upstream. I'll take a look, since the same failure happens on a regular x86_64 system and maybe our build_ffmpeg needs an update.

btw, we only support (and test) RasPi OS - vanilla Debian is not supported by RetroPie.

mitu

I've taken a look and the issue is fixed in a more recent PPSSPP version. Version 1.15 is nearing release, so the build will probably be fixed when we'll upgrade to that version.
Thanks for the report.

memorylane

@mitu Is it only a matter of updating the source version in the install script? Which version did you try?

mitu

@memorylane said in Cannot compile lr-ppsspp (ffmpeg arc4random implicit declaration error):

@mitu Is it only a matter of updating the source version in the install script?

Seems like it.

Which version did you try?

Latest stable release is 14.4 AFAIR.