mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-22 06:53:01 +00:00
424 lines
15 KiB
Nix
424 lines
15 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 ? ""
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, lib
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, stdenvNoCC
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, runtimeShell
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, bintools ? null, libc ? null, coreutils ? null, gnugrep ? null
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, apple-sdk ? null
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, netbsd ? null
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, sharedLibraryLoader ?
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if libc == null then
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null
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else if stdenvNoCC.targetPlatform.isNetBSD then
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if !(targetPackages ? netbsd) then
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netbsd.ld_elf_so
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else if libc != targetPackages.netbsd.headers then
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targetPackages.netbsd.ld_elf_so
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else
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null
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else
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lib.getLib libc
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, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
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, propagateDoc ? bintools != null && bintools ? man
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, extraPackages ? [], extraBuildCommands ? ""
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, isGNU ? bintools.isGNU or false
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, isLLVM ? bintools.isLLVM or false
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, isCCTools ? bintools.isCCTools or false
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, expand-response-params
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, targetPackages ? {}
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, wrapGas ? false
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# Note: the hardening flags are part of the bintools-wrapper, rather than
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# the cc-wrapper, because a few of them are handled by the linker.
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, defaultHardeningFlags ? [
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"bindnow"
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"format"
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"fortify"
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"fortify3"
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"pic"
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"relro"
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"stackprotector"
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"strictoverflow"
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"zerocallusedregs"
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] ++ lib.optional (with stdenvNoCC; lib.any (x: x) [
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# OpenBSD static linking requires PIE
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(with targetPlatform; isOpenBSD && isStatic)
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(lib.all (x: x) [
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# Musl-based platforms will keep "pie", other platforms will not.
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# If you change this, make sure to update section `{#sec-hardening-in-nixpkgs}`
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# in the nixpkgs manual to inform users about the defaults.
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(targetPlatform.libc == "musl")
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# Except when:
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# - static aarch64, where compilation works, but produces segfaulting dynamically linked binaries.
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# - static armv7l, where compilation fails.
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(!(targetPlatform.isAarch && targetPlatform.isStatic))
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])
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]) "pie"
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}:
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assert propagateDoc -> bintools ? man;
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assert nativeTools -> !propagateDoc && nativePrefix != "";
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assert !nativeTools -> 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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inherit (lib)
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attrByPath
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concatStringsSep
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getBin
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getDev
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getLib
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getName
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getVersion
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hasSuffix
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optional
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optionalAttrs
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optionals
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optionalString
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platforms
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removePrefix
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replaceStrings
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;
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inherit (stdenvNoCC) 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 = optionalString (targetPlatform != hostPlatform)
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(targetPlatform.config + "-");
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bintoolsVersion = getVersion bintools;
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bintoolsName = removePrefix targetPrefix (getName bintools);
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libc_bin = optionalString (libc != null) (getBin libc);
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libc_dev = optionalString (libc != null) (getDev libc);
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libc_lib = optionalString (libc != null) (getLib libc);
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bintools_bin = optionalString (!nativeTools) (getBin bintools);
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# The wrapper scripts use 'cat' and 'grep', so we may need coreutils.
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coreutils_bin = optionalString (!nativeTools) (getBin coreutils);
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# See description in cc-wrapper.
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suffixSalt = replaceStrings ["-" "."] ["_" "_"] targetPlatform.config
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+ lib.optionalString (targetPlatform.isDarwin && targetPlatform.isStatic) "_static";
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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 sharedLibraryLoader == null then ""
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else if targetPlatform.libc == "musl" then "${sharedLibraryLoader}/lib/ld-musl-*"
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else if targetPlatform.libc == "uclibc" then "${sharedLibraryLoader}/lib/ld*-uClibc.so.1"
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else if (targetPlatform.libc == "bionic" && targetPlatform.is32bit) then "/system/bin/linker"
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else if (targetPlatform.libc == "bionic" && targetPlatform.is64bit) then "/system/bin/linker64"
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else if targetPlatform.libc == "nblibc" then "${sharedLibraryLoader}/libexec/ld.elf_so"
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else if targetPlatform.system == "i686-linux" then "${sharedLibraryLoader}/lib/ld-linux.so.2"
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else if targetPlatform.system == "x86_64-linux" then "${sharedLibraryLoader}/lib/ld-linux-x86-64.so.2"
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else if targetPlatform.system == "s390x-linux" then "${sharedLibraryLoader}/lib/ld64.so.1"
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# ELFv1 (.1) or ELFv2 (.2) ABI
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else if targetPlatform.isPower64 then "${sharedLibraryLoader}/lib/ld64.so.*"
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# ARM with a wildcard, which can be "" or "-armhf".
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else if (with targetPlatform; isAarch32 && isLinux) then "${sharedLibraryLoader}/lib/ld-linux*.so.3"
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else if targetPlatform.system == "aarch64-linux" then "${sharedLibraryLoader}/lib/ld-linux-aarch64.so.1"
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else if targetPlatform.system == "powerpc-linux" then "${sharedLibraryLoader}/lib/ld.so.1"
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else if targetPlatform.system == "s390-linux" then "${sharedLibraryLoader}/lib/ld.so.1"
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else if targetPlatform.system == "s390x-linux" then "${sharedLibraryLoader}/lib/ld64.so.1"
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else if targetPlatform.isMips then "${sharedLibraryLoader}/lib/ld.so.1"
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# `ld-linux-riscv{32,64}-<abi>.so.1`
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else if targetPlatform.isRiscV then "${sharedLibraryLoader}/lib/ld-linux-riscv*.so.1"
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else if targetPlatform.isLoongArch64 then "${sharedLibraryLoader}/lib/ld-linux-loongarch*.so.1"
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else if targetPlatform.isDarwin then "/usr/lib/dyld"
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else if targetPlatform.isFreeBSD then "${sharedLibraryLoader}/libexec/ld-elf.so.1"
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else if targetPlatform.isOpenBSD then "${sharedLibraryLoader}/libexec/ld.so"
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else if hasSuffix "pc-gnu" targetPlatform.config then "ld.so.1"
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else "";
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in
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stdenvNoCC.mkDerivation {
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pname = targetPrefix
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+ (if name != "" then name else "${bintoolsName}-wrapper");
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version = optionalString (bintools != null) bintoolsVersion;
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preferLocalBuild = true;
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outputs = [ "out" ] ++ optionals propagateDoc ([ "man" ] ++ optional (bintools ? info) "info");
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passthru = {
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inherit targetPrefix suffixSalt;
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inherit bintools libc nativeTools nativeLibc nativePrefix isGNU isLLVM;
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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_LDFLAGS_${suffixSalt}" (concat (getenv "NIX_LDFLAGS_${suffixSalt}") " -L" arg "/lib")))
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(when (file-directory-p (concat arg "/lib64"))
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(setenv "NIX_LDFLAGS_${suffixSalt}" (concat (getenv "NIX_LDFLAGS_${suffixSalt}") " -L" arg "/lib64"))))
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'(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
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'';
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inherit defaultHardeningFlags;
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};
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dontBuild = true;
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dontConfigure = true;
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enableParallelBuilding = 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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mkdir -p $out/bin $out/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="$3"
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export use_response_file_by_default=${if isCCTools then "1" else "0"}
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substituteAll "$wrapper" "$out/bin/$dst"
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chmod +x "$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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# Solaris needs an additional ld wrapper.
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+ optionalString (targetPlatform.isSunOS && nativePrefix != "") ''
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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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# If we are asked to wrap `gas` and this bintools has it,
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# then symlink it (`as` will be symlinked next).
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# This is mainly for the wrapped gnat-bootstrap on x86-64 Darwin,
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# as it must have both the GNU assembler from cctools (installed as `gas`)
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# and the Clang integrated assembler (installed as `as`).
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# See pkgs/os-specific/darwin/binutils/default.nix for details.
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+ optionalString wrapGas ''
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if [ -e $ldPath/${targetPrefix}gas ]; then
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ln -s $ldPath/${targetPrefix}gas $out/bin/${targetPrefix}gas
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fi
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''
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# Create symlinks for rest of the binaries.
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+ ''
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for binary in objdump objcopy size strings as ar nm gprof dwp c++filt addr2line \
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ranlib readelf elfedit dlltool dllwrap windmc windres; do
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if [ -e $ldPath/${targetPrefix}''${binary} ]; then
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ln -s $ldPath/${targetPrefix}''${binary} $out/bin/${targetPrefix}''${binary}
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fi
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done
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if [ -e ''${ld:-$ldPath/${targetPrefix}ld} ]; then
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wrap ${targetPrefix}ld ${./ld-wrapper.sh} ''${ld:-$ldPath/${targetPrefix}ld}
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fi
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for variant in $ldPath/${targetPrefix}ld.*; do
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basename=$(basename "$variant")
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wrap $basename ${./ld-wrapper.sh} $variant
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done
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'';
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strictDeps = true;
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depsTargetTargetPropagated = extraPackages;
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setupHooks = [
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../setup-hooks/role.bash
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./setup-hook.sh
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];
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postFixup =
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##
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## General libc support
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##
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optionalString (libc != null) (''
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touch "$out/nix-support/libc-ldflags"
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echo "-L${libc_lib}${libc.libdir or "/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}" > $out/nix-support/orig-libc-dev
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''
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##
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## Dynamic linker support
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##
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+ optionalString (sharedLibraryLoader != null) ''
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if [[ -z ''${dynamicLinker+x} ]]; then
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echo "Don't know the name of the dynamic linker for platform '${targetPlatform.config}', so guessing instead." >&2
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local dynamicLinker="${sharedLibraryLoader}/lib/ld*.so.?"
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fi
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''
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# Expand globs to fill array of options
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+ ''
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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 optionalString (sharedLibraryLoader != null) ''
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if [ -e ${sharedLibraryLoader}/lib/32/ld-linux.so.2 ]; then
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echo ${sharedLibraryLoader}/lib/32/ld-linux.so.2 > $out/nix-support/dynamic-linker-m32
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fi
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touch $out/nix-support/ld-set-dynamic-linker
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''}
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fi
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'')
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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 (same for any
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# binaries of libc).
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+ optionalString (!nativeTools) ''
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printWords ${bintools_bin} ${optionalString (libc != null) libc_bin} > $out/nix-support/propagated-user-env-packages
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''
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##
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## Man page and info support
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##
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+ optionalString propagateDoc (''
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ln -s ${bintools.man} $man
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'' + optionalString (bintools ? info) ''
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ln -s ${bintools.info} $info
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'')
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##
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## Hardening support
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##
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# some linkers on some platforms don't support specific -z flags
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+ ''
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export hardening_unsupported_flags=""
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if [[ "$($ldPath/${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/${targetPrefix}ld -z relro 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
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hardening_unsupported_flags+=" relro"
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fi
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''
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+ optionalString hostPlatform.isCygwin ''
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hardening_unsupported_flags+=" pic"
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''
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+ optionalString (targetPlatform.isAvr || targetPlatform.isWindows) ''
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hardening_unsupported_flags+=" relro bindnow"
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''
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+ optionalString (libc != null && targetPlatform.isAvr) ''
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for isa in avr5 avr3 avr4 avr6 avr25 avr31 avr35 avr51 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 tiny-stack; do
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echo "-L${getLib libc}/avr/lib/$isa" >> $out/nix-support/libc-cflags
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done
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''
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+ optionalString targetPlatform.isDarwin ''
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echo "-arch ${targetPlatform.darwinArch}" >> $out/nix-support/libc-ldflags
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''
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##
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## GNU specific extra strip flags
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##
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# TODO(@sternenseemann): make a generic strip wrapper?
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+ optionalString (bintools.isGNU or false || bintools.isCCTools or false) ''
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wrap ${targetPrefix}strip ${./gnu-binutils-strip-wrapper.sh} \
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"${bintools_bin}/bin/${targetPrefix}strip"
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''
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###
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### Remove certain timestamps from final binaries
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###
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+ optionalString (targetPlatform.isDarwin && !(bintools.isGNU or false)) ''
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echo "export ZERO_AR_DATE=1" >> $out/nix-support/setup-hook
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''
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+ ''
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for flags in "$out/nix-support"/*flags*; do
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substituteInPlace "$flags" --replace $'\n' ' '
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done
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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 ${../wrapper-common/utils.bash} $out/nix-support/utils.bash
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''
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###
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### Ensure consistent LC_VERSION_MIN_MACOSX
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###
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+ optionalString targetPlatform.isDarwin (
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let
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inherit (targetPlatform)
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darwinPlatform darwinSdkVersion
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darwinMinVersion darwinMinVersionVariable;
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in ''
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export darwinPlatform=${darwinPlatform}
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export darwinMinVersion=${darwinMinVersion}
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export darwinSdkVersion=${darwinSdkVersion}
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export darwinMinVersionVariable=${darwinMinVersionVariable}
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substituteAll ${./add-darwin-ldflags-before.sh} $out/nix-support/add-local-ldflags-before.sh
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''
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)
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##
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## Extra custom steps
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##
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+ extraBuildCommands;
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env = {
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# for substitution in utils.bash
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# TODO(@sternenseemann): invent something cleaner than passing in "" in case of absence
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expandResponseParams = "${expand-response-params}/bin/expand-response-params";
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# TODO(@sternenseemann): rename env var via stdenv rebuild
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shell = (getBin runtimeShell + runtimeShell.shellPath or "");
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gnugrep_bin = optionalString (!nativeTools) gnugrep;
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wrapperName = "BINTOOLS_WRAPPER";
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inherit dynamicLinker targetPrefix suffixSalt coreutils_bin;
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inherit bintools_bin libc_bin libc_dev libc_lib;
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default_hardening_flags_str = builtins.toString defaultHardeningFlags;
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} // lib.optionalAttrs (apple-sdk != null && stdenvNoCC.targetPlatform.isDarwin) {
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# Wrapped compilers should do something useful even when no SDK is provided at `DEVELOPER_DIR`.
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fallback_sdk = apple-sdk.__spliced.buildTarget or apple-sdk;
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};
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meta =
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let bintools_ = optionalAttrs (bintools != null) bintools; in
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(optionalAttrs (bintools_ ? meta) (removeAttrs bintools.meta ["priority"])) //
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{ description =
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attrByPath ["meta" "description"] "System binary utilities" bintools_
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+ " (wrapper script)";
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priority = 10;
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};
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}
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