90 lines
3.2 KiB
Nix
90 lines
3.2 KiB
Nix
# The Nix `clang' stdenv.mkDerivation is not directly usable, since it doesn't
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# know where the C library and standard header files are. Therefore
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# the compiler produced by that package cannot be installed directly
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# in a user environment and used from the command line. This
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# stdenv.mkDerivation provides a wrapper that sets up the right environment
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# variables so that the compiler and the linker just "work".
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{ name ? "", stdenv, nativeTools, nativeLibc, nativePrefix ? ""
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, clang ? null, libc ? null, binutils ? null, coreutils ? null, shell ? ""
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, zlib ? null, libcxx ? null
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}:
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assert nativeTools -> nativePrefix != "";
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assert !nativeTools -> clang != null && binutils != null && coreutils != null;
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assert !nativeLibc -> libc != null;
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let
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clangVersion = (builtins.parseDrvName clang.name).version;
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clangName = (builtins.parseDrvName clang.name).name;
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in
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stdenv.mkDerivation {
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name =
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(if name != "" then name else clangName + "-wrapper") +
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(if clang != null && clangVersion != "" then "-" + clangVersion else "");
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builder = ./builder.sh;
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setupHook = ./setup-hook.sh;
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clangWrapper = ./clang-wrapper.sh;
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ldWrapper = ./ld-wrapper.sh;
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utils = ./utils.sh;
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addFlags = ./add-flags;
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inherit nativeTools nativeLibc nativePrefix clang clangVersion libcxx;
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libcxxabi = libcxx.abi or null;
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gcc = clang.gcc;
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libc = if nativeLibc then null else libc;
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binutils = if nativeTools then null else binutils;
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# The wrapper scripts use 'cat', so we may need coreutils
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coreutils = if nativeTools then null else coreutils;
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langC = true;
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langCC = true;
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shell = if shell == "" then stdenv.shell else
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if builtins.isAttrs shell then (shell + shell.shellPath)
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else shell;
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crossAttrs = {
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shell = shell.crossDrv + shell.crossDrv.shellPath;
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libc = libc.crossDrv;
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coreutils = coreutils.crossDrv;
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binutils = binutils.crossDrv;
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clang = clang.crossDrv;
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#
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# This is not the best way to do this. I think the reference should be
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# the style in the gcc-cross-wrapper, but to keep a stable stdenv now I
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# do this sufficient if/else.
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dynamicLinker =
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(if stdenv.cross.arch == "arm" then "ld-linux.so.3" else
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if stdenv.cross.arch == "mips" then "ld.so.1" else
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if stdenv.lib.hasSuffix "pc-gnu" stdenv.cross.config then "ld.so.1" else
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abort "don't know the name of the dynamic linker for this platform");
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};
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meta =
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let clang_ = if clang != null then clang else {}; in
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(if clang_ ? meta then removeAttrs clang.meta ["priority"] else {}) //
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{ description =
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stdenv.lib.attrByPath ["meta" "description"] "System C compiler" clang_
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+ " (wrapper script)";
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};
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# The dynamic linker has different names on different Linux platforms.
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dynamicLinker =
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if !nativeLibc then
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(if stdenv.system == "i686-linux" then "ld-linux.so.2" else
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if stdenv.system == "x86_64-linux" then "ld-linux-x86-64.so.2" else
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if stdenv.isArm then "ld-linux.so.3" else
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if stdenv.system == "powerpc-linux" then "ld.so.1" else
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if stdenv.system == "mips64el-linux" then "ld.so.1" else
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abort "don't know the name of the dynamic linker for this platform")
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else "";
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preferLocalBuild = true;
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}
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