diff options
Diffstat (limited to 'nixpkgs/pkgs/build-support/rust/lib/default.nix')
| -rw-r--r-- | nixpkgs/pkgs/build-support/rust/lib/default.nix | 86 |
1 files changed, 85 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/build-support/rust/lib/default.nix b/nixpkgs/pkgs/build-support/rust/lib/default.nix index aa5ba14c1397..ceca7323176c 100644 --- a/nixpkgs/pkgs/build-support/rust/lib/default.nix +++ b/nixpkgs/pkgs/build-support/rust/lib/default.nix @@ -1,4 +1,8 @@ -{ lib }: +{ lib +, stdenv +, buildPackages +, targetPackages +}: rec { # https://doc.rust-lang.org/reference/conditional-compilation.html#target_arch @@ -59,8 +63,88 @@ rec { then builtins.toFile (toRustTarget platform + ".json") (builtins.toJSON platform.rustc.platform) else toRustTarget platform; + # Returns the name of the rust target if it is standard, or the + # basename of the file containing the custom target spec, without + # the .json extension. + # + # This is the name used by Cargo for target subdirectories. + toRustTargetSpecShort = platform: + lib.removeSuffix ".json" + (baseNameOf "${toRustTargetSpec platform}"); + + # When used as part of an environment variable name, triples are + # uppercased and have all hyphens replaced by underscores: + # + # https://github.com/rust-lang/cargo/pull/9169 + # https://github.com/rust-lang/cargo/issues/8285#issuecomment-634202431 + # + toRustTargetForUseInEnvVars = platform: + lib.strings.replaceStrings ["-"] ["_"] + (lib.strings.toUpper + (toRustTargetSpecShort platform)); + # Returns true if the target is no_std # https://github.com/rust-lang/rust/blob/2e44c17c12cec45b6a682b1e53a04ac5b5fcc9d2/src/bootstrap/config.rs#L415-L421 IsNoStdTarget = platform: let rustTarget = toRustTarget platform; in builtins.any (t: lib.hasInfix t rustTarget) ["-none" "nvptx" "switch" "-uefi"]; + + # These environment variables must be set when using `cargo-c` and + # several other tools which do not deal well with cross + # compilation. The symptom of the problem they fix is errors due + # to buildPlatform CFLAGS being passed to the + # hostPlatform-targeted compiler -- for example, `-m64` being + # passed on a build=x86_64/host=aarch64 compilation. + envVars = let + ccForBuild = "${buildPackages.stdenv.cc}/bin/${buildPackages.stdenv.cc.targetPrefix}cc"; + cxxForBuild = "${buildPackages.stdenv.cc}/bin/${buildPackages.stdenv.cc.targetPrefix}c++"; + ccForHost = "${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"; + cxxForHost = "${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"; + + # Unfortunately we must use the dangerous `targetPackages` here + # because hooks are artificially phase-shifted one slot earlier + # (they go in nativeBuildInputs, so the hostPlatform looks like + # a targetPlatform to them). + ccForTarget = "${targetPackages.stdenv.cc}/bin/${targetPackages.stdenv.cc.targetPrefix}cc"; + cxxForTarget = "${targetPackages.stdenv.cc}/bin/${targetPackages.stdenv.cc.targetPrefix}c++"; + + rustBuildPlatform = toRustTarget stdenv.buildPlatform; + rustBuildPlatformSpec = toRustTargetSpec stdenv.buildPlatform; + rustHostPlatform = toRustTarget stdenv.hostPlatform; + rustHostPlatformSpec = toRustTargetSpec stdenv.hostPlatform; + rustTargetPlatform = toRustTarget stdenv.targetPlatform; + rustTargetPlatformSpec = toRustTargetSpec stdenv.targetPlatform; + in { + inherit + ccForBuild cxxForBuild rustBuildPlatform rustBuildPlatformSpec + ccForHost cxxForHost rustHostPlatform rustHostPlatformSpec + ccForTarget cxxForTarget rustTargetPlatform rustTargetPlatformSpec; + + # Prefix this onto a command invocation in order to set the + # variables needed by cargo. + # + setEnv = '' + env \ + '' + # Due to a bug in how splicing and targetPackages works, in + # situations where targetPackages is irrelevant + # targetPackages.stdenv.cc is often simply wrong. We must omit + # the following lines when rustTargetPlatform collides with + # rustHostPlatform. + + lib.optionalString (rustTargetPlatform != rustHostPlatform) '' + "CC_${toRustTargetForUseInEnvVars stdenv.targetPlatform}=${ccForTarget}" \ + "CXX_${toRustTargetForUseInEnvVars stdenv.targetPlatform}=${cxxForTarget}" \ + "CARGO_TARGET_${toRustTargetForUseInEnvVars stdenv.targetPlatform}_LINKER=${ccForTarget}" \ + '' + '' + "CC_${toRustTargetForUseInEnvVars stdenv.hostPlatform}=${ccForHost}" \ + "CXX_${toRustTargetForUseInEnvVars stdenv.hostPlatform}=${cxxForHost}" \ + "CARGO_TARGET_${toRustTargetForUseInEnvVars stdenv.hostPlatform}_LINKER=${ccForHost}" \ + '' + '' + "CC_${toRustTargetForUseInEnvVars stdenv.buildPlatform}=${ccForBuild}" \ + "CXX_${toRustTargetForUseInEnvVars stdenv.buildPlatform}=${cxxForBuild}" \ + "CARGO_TARGET_${toRustTargetForUseInEnvVars stdenv.buildPlatform}_LINKER=${ccForBuild}" \ + "CARGO_BUILD_TARGET=${rustBuildPlatform}" \ + "HOST_CC=${buildPackages.stdenv.cc}/bin/cc" \ + "HOST_CXX=${buildPackages.stdenv.cc}/bin/c++" \ + ''; + }; } |