runtime/llvmjit.nix
libfilcllvmjit.so, the native shim behind Fil-C's LLVM JIT API, built the way upstream's libpas/build_llvmjit.sh builds it. libpizlo dlopens it on the first JIT call; its LLVM includes the Fil-C passes, which run on every module the JIT compiles.
λpkgs, filc0, src
pkgs.stdenv.mkDerivation
runHook preBuild
python3 filc/llvmjit/gen_filc_llvm_jit_header.py
# LLVM was built without RTTI and exceptions, so the shim must match.
$CXX -g -O2 -fPIC -fvisibility=hidden -fno-rtti -fno-exceptions -std=c++20 \
-I ${filc0.dev}/include -Wno-deprecated-declarations \
-c filc/llvmjit/filc_llvm_jit_shim.cpp -o shim.o
# Fil-C processes have no host libstdc++ or libc to load, so link the C++
# runtime statically with no shared NEEDEDs; libc references bind to the
# hosting process's yolo glibc.
$CXX -g -shared -nodefaultlibs -o libfilcllvmjit.so shim.o \
-Wl,--version-script=filc/llvmjit/filc_llvm_jit_shim.version \
-Wl,--exclude-libs,ALL \
-Wl,--start-group ${filc0.dev}/lib/libLLVM*.a -Wl,--end-group \
"$($CXX -print-file-name=libstdc++.a)" \
"$($CXX -print-file-name=libgcc_eh.a)" \
"$($CXX -print-file-name=libgcc.a)"
runHook postBuild
runHook preInstall
install -Dm755 libfilcllvmjit.so $out/lib/libfilcllvmjit.so
runHook postInstall
The shim must not depend on the host's glibc or libstdc++ at run time.
true
if readelf -d $out/lib/libfilcllvmjit.so | grep -q NEEDED; then
readelf -d $out/lib/libfilcllvmjit.so | grep NEEDED
echo "libfilcllvmjit.so must have no NEEDED entries" >&2
exit 1
fi
"Fil-C LLVM JIT shim (libfilcllvmjit.so)"