e755a8a27d
Certain tools, e.g. compilers, are customarily prefixed with the name of their target platform so that multiple builds can be used at once without clobbering each other on the PATH. I was using identifiers named `prefix` for this purpose, but that conflicts with the standard use of `prefix` to mean the directory where something is installed. To avoid conflict and confusion, I renamed those to `targetPrefix`.
402 lines
15 KiB
Nix
402 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 ? "", stdenvNoCC, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
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, cc ? null, libc ? null, binutils ? null, coreutils ? null, shell ? stdenvNoCC.shell
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, zlib ? null, extraPackages ? [], extraBuildCommands ? ""
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, isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
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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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cc != null && binutils != 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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# For ghdl (the vhdl language provider to gcc) we need zlib in the wrapper.
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assert cc.langVhdl or false -> zlib != 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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ccVersion = (builtins.parseDrvName cc.name).version;
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ccName = (builtins.parseDrvName cc.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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cc_solib = getLib cc;
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binutils_bin = if nativeTools then "" else getBin binutils;
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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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default_cxx_stdlib_compile=optionalString (targetPlatform.isLinux && !(cc.isGNU or false))
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"-isystem $(echo -n ${cc.gcc}/include/c++/*) -isystem $(echo -n ${cc.gcc}/include/c++/*)/$(${cc.gcc}/bin/gcc -dumpmachine)";
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dashlessTarget = stdenv.lib.replaceStrings ["-"] ["_"] targetPlatform.config;
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# The "infix salt" is a arbitrary string added in the middle of env vars
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# defined by cc-wrapper's hooks so that multiple cc-wrappers can be used
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# without interfering. For the moment, it is defined as the target triple,
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# adjusted to be a valid bash identifier. This should be considered an
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# unstable implementation detail, however.
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infixSalt = dashlessTarget;
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# The dynamic linker has different names on different platforms. This is a
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# shell glob that ought to match it.
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dynamicLinker =
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/**/ if libc == null then null
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else if targetPlatform.system == "i686-linux" then "${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.system == "mips64el-linux" then "${libc_lib}/lib/ld.so.1"
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else if targetPlatform.isDarwin then "/usr/lib/dyld"
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else if stdenv.lib.hasSuffix "pc-gnu" targetPlatform.config then "ld.so.1"
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else null;
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expand-response-params =
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if buildPackages.stdenv.cc or null != null && buildPackages.stdenv.cc != "/dev/null"
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then import ../expand-response-params { inherit (buildPackages) stdenv; }
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else "";
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in
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stdenv.mkDerivation {
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name = targetPrefix
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+ (if name != "" then name else "${ccName}-wrapper")
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+ (stdenv.lib.optionalString (cc != null && ccVersion != "") "-${ccVersion}");
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preferLocalBuild = true;
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inherit cc libc_bin libc_dev libc_lib binutils_bin coreutils_bin;
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shell = getBin shell + shell.shellPath or "";
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gnugrep_bin = if nativeTools then "" else gnugrep;
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inherit targetPrefix infixSalt;
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outputs = [ "out" "man" ];
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passthru = {
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# "cc" is the generic name for a C compiler, but there is no one for package
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# providing the linker and related tools. The two we use now are GNU
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# Binutils, and Apple's "cctools"; "binutils" as an attempt to find an
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# unused middle-ground name that evokes both.
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bintools = binutils_bin;
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inherit libc nativeTools nativeLibc nativePrefix isGNU isClang default_cxx_stdlib_compile;
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emacsBufferSetup = pkgs: ''
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; We should handle propagation here too
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(mapc (lambda (arg)
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(when (file-directory-p (concat arg "/include"))
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(setenv "NIX_${infixSalt}_CFLAGS_COMPILE" (concat (getenv "NIX_${infixSalt}_CFLAGS_COMPILE") " -isystem " arg "/include")))
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(when (file-directory-p (concat arg "/lib"))
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(setenv "NIX_${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_${infixSalt}_LDFLAGS") " -L" arg "/lib64")))) '(${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/nix-support $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="$3"
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substituteAll "$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 ${if targetPlatform.isDarwin then cc else nativePrefix} > $out/nix-support/orig-cc
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ccPath="${if targetPlatform.isDarwin then cc else nativePrefix}/bin"
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ldPath="${nativePrefix}/bin"
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'' else ''
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echo $cc > $out/nix-support/orig-cc
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ccPath="${cc}/bin"
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ldPath="${binutils_bin}/bin"
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''
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+ optionalString (targetPlatform.isSunOS && nativePrefix != "") ''
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# Solaris needs an additional ld wrapper.
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ldPath="${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). This is useful when a
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# cc-wrapper is installed in a user environment, as it ensures that
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# the right assembler is called.
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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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if [ -e ${binutils_bin}/bin/${targetPrefix}ld.gold ]; then
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wrap ${targetPrefix}ld.gold ${./ld-wrapper.sh} ${binutils_bin}/bin/${targetPrefix}ld.gold
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fi
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if [ -e ${binutils_bin}/bin/ld.bfd ]; then
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wrap ${targetPrefix}ld.bfd ${./ld-wrapper.sh} ${binutils_bin}/bin/${targetPrefix}ld.bfd
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fi
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# We export environment variables pointing to the wrapped nonstandard
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# cmds, lest some lousy configure script use those to guess compiler
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# version.
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export named_cc=${targetPrefix}cc
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export named_cxx=${targetPrefix}c++
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export default_cxx_stdlib_compile="${default_cxx_stdlib_compile}"
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if [ -e $ccPath/${targetPrefix}gcc ]; then
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wrap ${targetPrefix}gcc ${./cc-wrapper.sh} $ccPath/${targetPrefix}gcc
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ln -s ${targetPrefix}gcc $out/bin/${targetPrefix}cc
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export named_cc=${targetPrefix}gcc
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export named_cxx=${targetPrefix}g++
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elif [ -e $ccPath/clang ]; then
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wrap ${targetPrefix}clang ${./cc-wrapper.sh} $ccPath/clang
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ln -s ${targetPrefix}clang $out/bin/${targetPrefix}cc
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export named_cc=${targetPrefix}clang
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export named_cxx=${targetPrefix}clang++
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fi
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if [ -e $ccPath/${targetPrefix}g++ ]; then
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wrap ${targetPrefix}g++ ${./cc-wrapper.sh} $ccPath/${targetPrefix}g++
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ln -s ${targetPrefix}g++ $out/bin/${targetPrefix}c++
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elif [ -e $ccPath/clang++ ]; then
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wrap ${targetPrefix}clang++ ${./cc-wrapper.sh} $ccPath/clang++
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ln -s ${targetPrefix}clang++ $out/bin/${targetPrefix}c++
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fi
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if [ -e $ccPath/cpp ]; then
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wrap ${targetPrefix}cpp ${./cc-wrapper.sh} $ccPath/cpp
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fi
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''
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+ optionalString cc.langFortran or false ''
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wrap ${targetPrefix}gfortran ${./cc-wrapper.sh} $ccPath/${targetPrefix}gfortran
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ln -sv ${targetPrefix}gfortran $out/bin/${targetPrefix}g77
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ln -sv ${targetPrefix}gfortran $out/bin/${targetPrefix}f77
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''
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+ optionalString cc.langJava or false ''
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wrap ${targetPrefix}gcj ${./cc-wrapper.sh} $ccPath/${targetPrefix}gcj
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''
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+ optionalString cc.langGo or false ''
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wrap ${targetPrefix}gccgo ${./cc-wrapper.sh} $ccPath/${targetPrefix}gccgo
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''
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+ optionalString cc.langAda or false ''
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wrap ${targetPrefix}gnatgcc ${./cc-wrapper.sh} $ccPath/${targetPrefix}gnatgcc
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wrap ${targetPrefix}gnatmake ${./gnat-wrapper.sh} $ccPath/${targetPrefix}gnatmake
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wrap ${targetPrefix}gnatbind ${./gnat-wrapper.sh} $ccPath/${targetPrefix}gnatbind
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wrap ${targetPrefix}gnatlink ${./gnatlink-wrapper.sh} $ccPath/${targetPrefix}gnatlink
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''
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+ optionalString cc.langVhdl or false ''
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ln -s $ccPath/${targetPrefix}ghdl $out/bin/${targetPrefix}ghdl
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'';
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propagatedBuildInputs = 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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# The "-B${libc_lib}/lib/" flag is a quick hack to force gcc to link
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# against the crt1.o from our own glibc, rather than the one in
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# /usr/lib. (This is only an issue when using an `impure'
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# compiler/linker, i.e., one that searches /usr/lib and so on.)
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#
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# Unfortunately, setting -B appears to override the default search
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# path. Thus, the gcc-specific "../includes-fixed" directory is
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# now longer searched and glibc's <limits.h> header fails to
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# compile, because it uses "#include_next <limits.h>" to find the
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# limits.h file in ../includes-fixed. To remedy the problem,
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# another -idirafter is necessary to add that directory again.
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echo "-B${libc_lib}/lib/ -idirafter ${libc_dev}/include -idirafter ${cc}/lib/gcc/*/*/include-fixed" > $out/nix-support/libc-cflags
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echo "-L${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 gcc/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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## Initial CFLAGS
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##
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# GCC shows ${cc_solib}/lib in `gcc -print-search-dirs', but not
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# ${cc_solib}/lib64 (even though it does actually search there...)..
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# This confuses libtool. So add it to the compiler tool search
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# path explicitly.
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if [ -e "${cc_solib}/lib64" -a ! -L "${cc_solib}/lib64" ]; then
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ccLDFlags+=" -L${cc_solib}/lib64"
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ccCFlags+=" -B${cc_solib}/lib64"
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fi
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ccLDFlags+=" -L${cc_solib}/lib"
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ccCFlags+=" -B${cc_solib}/lib"
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${optionalString cc.langVhdl or false ''
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ccLDFlags+=" -L${zlib.out}/lib"
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''}
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# Find the gcc libraries path (may work only without multilib).
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${optionalString cc.langAda or false ''
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basePath=`echo ${cc_solib}/lib/*/*/*`
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ccCFlags+=" -B$basePath -I$basePath/adainclude"
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gnatCFlags="-aI$basePath/adainclude -aO$basePath/adalib"
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echo "$gnatCFlags" > $out/nix-support/gnat-cflags
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''}
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echo "$ccLDFlags" > $out/nix-support/cc-ldflags
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echo "$ccCFlags" > $out/nix-support/cc-cflags
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##
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## User env support
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##
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# Propagate the wrapped cc so that if you install the wrapper,
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# you get tools like gcov, the manpages, etc. as well (including
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# for binutils and Glibc).
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printWords ${cc} ${binutils_bin} ${if libc == null then "" else libc_bin} > $out/nix-support/propagated-user-env-packages
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printWords ${cc.man or ""} > $man/nix-support/propagated-user-env-packages
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''
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+ ''
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##
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## Hardening support
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##
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# some linkers on some platforms don't support specific -z flags
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export hardening_unsupported_flags=""
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if [[ "$($ldPath/${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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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 ${./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 cc_ = if cc != null then cc else {}; in
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(if cc_ ? meta then removeAttrs cc.meta ["priority"] else {}) //
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{ description =
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stdenv.lib.attrByPath ["meta" "description"] "System C compiler" cc_
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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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