Roguelikes are more fun with source.

Preamble on Deterministic Build Results

The C language specification allows compilers to grab information from the runtime environment and jam it into the executable. On one hand, it's nice to have locale and time information in a build. On the other hand, it obscures the super power of digital devices to produce consistent results across the globe. We provide explicit values below to achieve stable results.

Example Build Environment

Linux (Ubuntu 22.04)
Bash (5.1)
Cosmocc (3.6.2) https://github.com/jart/cosmopolitan/releases/tag/3.6.2
SDL (2.28.5) https://github.com/libsdl-org/SDL/releases/tag/release-2.28.5
Game repository: git clone https://rufe.org/source/moria_at

Shell Variables

Use a shell variable for the absolute path of SDL2 ($SDLPATH)

Use a shell variable for the absolute path of cosmocc ($COSMOCC)

Capture values for hash and version. Store them in a shell variables:

export VERSION=0003.0000.0360
export HASH=97b6c8dd295ec62

Setup

git reset --hard $HASH
ln -sf $SDLPATH sdl2
ln -sf `realpath platform/sdl2` src/platform

Building from the game repository root

LC_ALL=C SOURCE_DATE_DEPOCH=0 $COSMOCC src/moria_at.c -O1 -g1 -I. -fno-omit-frame-pointer -Wno-implicit-function-declaration -Wno-implicit-int -Wno-return-type -Isdl2/include -DNDEBUG -DRELEASE -U__DATE__ -U__TIME__ -fno-math-errno -ffp-contract=fast -freciprocal-math -fno-trapping-math -lm -o bin/moria_at.exe

Binary Versioning

sed -i "s/\/$VERSION/g" bin/moria_at.exe
sed -i "s/\/$HASH/g" bin/moria_at.exe

Compare hashes with Steam

sha256sum bin/moria_at.exe
sha256sum $STEAMDIR/steamapps/common/Moria/moria_at.exe