314 lines
11 KiB
Nix
314 lines
11 KiB
Nix
# The Nixpkgs CC is not directly usable, since it doesn't know where
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# the C library and standard header files are. Therefore the compiler
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# produced by that package cannot be installed directly in a user
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# environment and used from the command line. So we use a wrapper
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# script that sets up the right environment variables so that the
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# compiler and the linker just "work".
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{ name ? "", stdenvNoCC, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
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, bintools ? null, libc ? null
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, coreutils ? null, shell ? stdenvNoCC.shell, gnugrep ? null
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, extraPackages ? [], extraBuildCommands ? ""
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, buildPackages ? {}
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, useMacosReexportHack ? false
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}:
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with stdenvNoCC.lib;
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assert nativeTools -> nativePrefix != "";
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assert !nativeTools ->
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bintools != null && coreutils != null && gnugrep != null;
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assert !(nativeLibc && noLibc);
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assert (noLibc || nativeLibc) == (libc == null);
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let
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stdenv = stdenvNoCC;
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inherit (stdenv) hostPlatform targetPlatform;
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# Prefix for binaries. Customarily ends with a dash separator.
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#
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# TODO(@Ericson2314) Make unconditional, or optional but always true by
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# default.
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targetPrefix = stdenv.lib.optionalString (targetPlatform != hostPlatform)
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(targetPlatform.config + "-");
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bintoolsVersion = (builtins.parseDrvName bintools.name).version;
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bintoolsName = (builtins.parseDrvName bintools.name).name;
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libc_bin = if libc == null then null else getBin libc;
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libc_dev = if libc == null then null else getDev libc;
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libc_lib = if libc == null then null else getLib libc;
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bintools_bin = if nativeTools then "" else getBin bintools;
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# The wrapper scripts use 'cat' and 'grep', so we may need coreutils.
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coreutils_bin = if nativeTools then "" else getBin coreutils;
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dashlessTarget = stdenv.lib.replaceStrings ["-"] ["_"] targetPlatform.config;
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# See description in cc-wrapper.
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infixSalt = dashlessTarget;
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# The dynamic linker has different names on different platforms. This is a
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# shell glob that ought to match it.
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dynamicLinker =
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/**/ if libc == null then null
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else if targetPlatform.libc == "musl" then "${libc_lib}/lib/ld-musl-*"
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else if targetPlatform.system == "i686-linux" then "${libc_lib}/lib/ld-linux.so.2"
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else if targetPlatform.system == "x86_64-linux" then "${libc_lib}/lib/ld-linux-x86-64.so.2"
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# ARM with a wildcard, which can be "" or "-armhf".
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else if (with targetPlatform; isArm && isLinux) then "${libc_lib}/lib/ld-linux*.so.3"
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else if targetPlatform.system == "aarch64-linux" then "${libc_lib}/lib/ld-linux-aarch64.so.1"
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else if targetPlatform.system == "powerpc-linux" then "${libc_lib}/lib/ld.so.1"
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else if targetPlatform.isMips then "${libc_lib}/lib/ld.so.1"
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else if targetPlatform.isDarwin then "/usr/lib/dyld"
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else if stdenv.lib.hasSuffix "pc-gnu" targetPlatform.config then "ld.so.1"
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else null;
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expand-response-params =
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if buildPackages.stdenv.cc or null != null && buildPackages.stdenv.cc != "/dev/null"
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then import ../expand-response-params { inherit (buildPackages) stdenv; }
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else "";
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in
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stdenv.mkDerivation {
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name = targetPrefix
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+ (if name != "" then name else "${bintoolsName}-wrapper")
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+ (stdenv.lib.optionalString (bintools != null && bintoolsVersion != "") "-${bintoolsVersion}");
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preferLocalBuild = true;
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inherit bintools_bin libc_bin libc_dev libc_lib coreutils_bin;
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shell = getBin shell + shell.shellPath or "";
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gnugrep_bin = if nativeTools then "" else gnugrep;
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inherit targetPrefix infixSalt;
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outputs = [ "out" "info" "man" ];
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passthru = {
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inherit bintools libc nativeTools nativeLibc nativePrefix;
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emacsBufferSetup = pkgs: ''
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; We should handle propagation here too
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(mapc
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(lambda (arg)
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(when (file-directory-p (concat arg "/lib"))
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(setenv "NIX_${infixSalt}_LDFLAGS" (concat (getenv "NIX_${infixSalt}_LDFLAGS") " -L" arg "/lib")))
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(when (file-directory-p (concat arg "/lib64"))
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(setenv "NIX_${infixSalt}_LDFLAGS" (concat (getenv "NIX_${infixSalt}_LDFLAGS") " -L" arg "/lib64"))))
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'(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
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'';
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};
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dontBuild = true;
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dontConfigure = true;
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unpackPhase = ''
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src=$PWD
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'';
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installPhase =
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''
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set -u
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mkdir -p $out/bin {$out,$info,$man}/nix-support
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wrap() {
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local dst="$1"
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local wrapper="$2"
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export prog="$3"
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set +u
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substituteAll "$wrapper" "$out/bin/$dst"
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set -u
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chmod +x "$out/bin/$dst"
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}
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''
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+ (if nativeTools then ''
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echo ${nativePrefix} > $out/nix-support/orig-bintools
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ldPath="${nativePrefix}/bin"
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'' else ''
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echo $bintools_bin > $out/nix-support/orig-bintools
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ldPath="${bintools_bin}/bin"
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''
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+ optionalString (targetPlatform.isSunOS && nativePrefix != "") ''
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# Solaris needs an additional ld wrapper.
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ldPath="${nativePrefix}/bin"
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exec="$ldPath/${targetPrefix}ld"
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wrap ld-solaris ${./ld-solaris-wrapper.sh}
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'')
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+ ''
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# Create a symlink to as (the assembler).
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if [ -e $ldPath/${targetPrefix}as ]; then
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ln -s $ldPath/${targetPrefix}as $out/bin/${targetPrefix}as
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fi
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'' + (if !useMacosReexportHack then ''
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wrap ${targetPrefix}ld ${./ld-wrapper.sh} ''${ld:-$ldPath/${targetPrefix}ld}
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'' else ''
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ldInner="${targetPrefix}ld-reexport-delegate"
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wrap "$ldInner" ${./macos-sierra-reexport-hack.bash} ''${ld:-$ldPath/${targetPrefix}ld}
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wrap "${targetPrefix}ld" ${./ld-wrapper.sh} "$out/bin/$ldInner"
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unset ldInner
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'') + ''
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for variant in ld.gold ld.bfd ld.lld; do
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local underlying=$ldPath/${targetPrefix}$variant
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[[ -e "$underlying" ]] || continue
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wrap ${targetPrefix}$variant ${./ld-wrapper.sh} $underlying
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done
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set +u
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'';
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emulation = let
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fmt =
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/**/ if targetPlatform.isDarwin then "mach-o"
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else if targetPlatform.isWindows then "pe"
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else "elf" + toString targetPlatform.parsed.cpu.bits;
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endianPrefix = if targetPlatform.isBigEndian then "big" else "little";
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sep = optionalString (!targetPlatform.isMips) "-";
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arch =
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/**/ if targetPlatform.isAarch64 then endianPrefix + "aarch64"
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else if targetPlatform.isArm then endianPrefix + "arm"
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else if targetPlatform.isx86_64 then "x86-64"
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else if targetPlatform.isi686 then "i386"
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else if targetPlatform.isMips then {
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"mips" = "btsmipn32"; # n32 variant
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"mipsel" = "ltsmipn32"; # n32 variant
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"mips64" = "btsmip";
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"mips64el" = "ltsmip";
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}.${targetPlatform.parsed.cpu.name}
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else throw "unknown emulation for platform: " + targetPlatform.config;
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in targetPlatform.platform.bfdEmulation or (fmt + sep + arch);
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depsTargetTargetPropagated = extraPackages;
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setupHook = ./setup-hook.sh;
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postFixup =
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''
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set -u
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''
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+ optionalString (libc != null) (''
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##
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## General libc support
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##
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echo "-L${libc_lib}/lib" > $out/nix-support/libc-ldflags
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echo "${libc_lib}" > $out/nix-support/orig-libc
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echo "${libc_dev}" > $out/nix-support/orig-libc-dev
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##
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## Dynamic linker support
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##
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if [[ -z ''${dynamicLinker+x} ]]; then
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echo "Don't know the name of the dynamic linker for platform '${targetPlatform.config}', so guessing instead." >&2
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local dynamicLinker="${libc_lib}/lib/ld*.so.?"
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fi
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# Expand globs to fill array of options
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dynamicLinker=($dynamicLinker)
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case ''${#dynamicLinker[@]} in
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0) echo "No dynamic linker found for platform '${targetPlatform.config}'." >&2;;
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1) echo "Using dynamic linker: '$dynamicLinker'" >&2;;
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*) echo "Multiple dynamic linkers found for platform '${targetPlatform.config}'." >&2;;
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esac
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if [ -n "''${dynamicLinker:-}" ]; then
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echo $dynamicLinker > $out/nix-support/dynamic-linker
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'' + (if targetPlatform.isDarwin then ''
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printf "export LD_DYLD_PATH=%q\n" "$dynamicLinker" >> $out/nix-support/setup-hook
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'' else ''
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if [ -e ${libc_lib}/lib/32/ld-linux.so.2 ]; then
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echo ${libc_lib}/lib/32/ld-linux.so.2 > $out/nix-support/dynamic-linker-m32
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fi
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local ldflagsBefore=(-dynamic-linker "$dynamicLinker")
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'') + ''
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fi
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# The dynamic linker is passed in `ldflagsBefore' to allow
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# explicit overrides of the dynamic linker by callers to ld
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# (the *last* value counts, so ours should come first).
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printWords "''${ldflagsBefore[@]}" > $out/nix-support/libc-ldflags-before
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'')
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+ optionalString (!nativeTools) ''
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##
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## User env support
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##
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# Propagate the underling unwrapped bintools so that if you
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# install the wrapper, you get tools like objdump, the manpages,
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# etc. as well (same for any binaries of libc).
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printWords ${bintools_bin} ${if libc == null then "" else libc_bin} > $out/nix-support/propagated-user-env-packages
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##
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## Man page and info support
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##
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printWords ${bintools.info or ""} \
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>> $info/nix-support/propagated-build-inputs
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printWords ${bintools.man or ""} \
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>> $man/nix-support/propagated-build-inputs
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''
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+ ''
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##
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## Hardening support
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##
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# some linkers on some platforms don't support specific -z flags
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export hardening_unsupported_flags=""
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if [[ "$($ldPath/${targetPrefix}ld -z now 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
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hardening_unsupported_flags+=" bindnow"
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fi
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if [[ "$($ldPath/${targetPrefix}ld -z relro 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
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hardening_unsupported_flags+=" relro"
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fi
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''
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+ optionalString hostPlatform.isCygwin ''
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hardening_unsupported_flags+=" pic"
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''
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+ ''
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set +u
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substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
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substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh
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substituteAll ${../cc-wrapper/utils.sh} $out/nix-support/utils.sh
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##
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## Extra custom steps
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##
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''
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+ extraBuildCommands;
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inherit dynamicLinker expand-response-params;
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# for substitution in utils.sh
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expandResponseParams = "${expand-response-params}/bin/expand-response-params";
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meta =
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let bintools_ = if bintools != null then bintools else {}; in
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(if bintools_ ? meta then removeAttrs bintools.meta ["priority"] else {}) //
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{ description =
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stdenv.lib.attrByPath ["meta" "description"] "System binary utilities" bintools_
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+ " (wrapper script)";
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} // optionalAttrs useMacosReexportHack {
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platforms = stdenv.lib.platforms.darwin;
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};
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}
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