depot/third_party/nixpkgs/pkgs/applications/virtualization/qemu/binfmt-p-wrapper.nix

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# binfmt preserve-argv[0] wrapper
#
# More details in binfmt-p-wrapper.c
#
# The wrapper has to be static so LD_* environment variables
# cannot affect the execution of the wrapper itself.
{ lib, stdenv, pkgsStatic, enableDebug ? false }:
name: emulator:
pkgsStatic.stdenv.mkDerivation {
inherit name;
src = ./binfmt-p-wrapper.c;
dontUnpack = true;
dontInstall = true;
buildPhase = ''
runHook preBuild
mkdir -p $out/bin
$CC -o $out/bin/${name} -static -std=c99 -O2 \
-DTARGET_QEMU=\"${emulator}\" \
${lib.optionalString enableDebug "-DDEBUG"} \
$src
runHook postBuild
'';
}