pkgs/build-support/bintools-wrapper/add-darwin-ldflags-before.sh

   1 # Unconditionally adding in platform version flags will result in warnings that
   2 # will be treated as errors by some packages. Add any missing flags here.
   3
   4 # There are two things to be configured: the "platform version" (oldest
   5 # supported version of macos, ios, etc), and the "sdk version".
   6 #
   7 # The modern way of configuring these is to use:
   8 #    -platform_version $platform $platform_version $sdk_version"
   9 #
  10 # The old way is still supported, and uses flags like:
  11 #    -${platform}_version_min $platform_version
  12 #    -sdk_version $sdk_version
  13 #
  14 # If both styles are specified ld will combine them. If multiple versions are
  15 # specified for the same platform, ld will emit an error.
  16 #
  17 # The following adds flags for whichever properties have not already been
  18 # provided.
  19
  20 havePlatformVersionFlag=
  21 haveDarwinSDKVersion=
  22 haveDarwinPlatformVersion=
  23
  24 # Roles will set by add-flags.sh, but add-flags.sh can be skipped when the
  25 # cc-wrapper has added the linker flags. Both the cc-wrapper and the binutils
  26 # wrapper mangle the same variable (MACOSX_DEPLOYMENT_TARGET), so if roles are
  27 # empty due to being run through the cc-wrapper then the mangle here is a no-op
  28 # and we still do the right thing.
  29 #
  30 # To be robust, make sure we always have the correct set of roles.
  31 accumulateRoles
  32
  33 mangleVarSingle @darwinMinVersionVariable@ ${role_suffixes[@]+"${role_suffixes[@]}"}
  34
  35 n=0
  36 nParams=${#params[@]}
  37 while (( n < nParams )); do
  38     p=${params[n]}
  39     case "$p" in
  40         # the current platform
  41         -@darwinPlatform@_version_min)
  42             haveDarwinPlatformVersion=1
  43             ;;
  44
  45         # legacy aliases
  46         -macosx_version_min|-iphoneos_version_min|-iosmac_version_min|-uikitformac_version_min)
  47             haveDarwinPlatformVersion=1
  48             ;;
  49
  50         -sdk_version)
  51             haveDarwinSDKVersion=1
  52             ;;
  53
  54         -platform_version)
  55             havePlatformVersionFlag=1
  56
  57             # If clang can't determine the sdk version it will pass 0.0.0. This
  58             # has runtime effects so we override this to use the known sdk
  59             # version.
  60             if [ "${params[n+3]-}" = 0.0.0 ]; then
  61                 params[n+3]=@darwinSdkVersion@
  62             fi
  63             ;;
  64     esac
  65     n=$((n + 1))
  66 done
  67
  68 # If the caller has set -platform_version, trust they're doing the right thing.
  69 # This will be the typical case for clang in nixpkgs.
  70 if [ ! "$havePlatformVersionFlag" ]; then
  71     if [ ! "$haveDarwinSDKVersion" ] && [ ! "$haveDarwinPlatformVersion" ]; then
  72         # Nothing provided. Use the modern "-platform_version" to set both.
  73         extraBefore+=(-platform_version @darwinPlatform@ "${@darwinMinVersionVariable@_@suffixSalt@:-@darwinMinVersion@}" @darwinSdkVersion@)
  74     elif [ ! "$haveDarwinSDKVersion" ]; then
  75         # Add missing sdk version
  76         extraBefore+=(-sdk_version @darwinSdkVersion@)
  77     elif [ ! "$haveDarwinPlatformVersion" ]; then
  78         # Add missing platform version
  79         extraBefore+=(-@darwinPlatform@_version_min "${@darwinMinVersionVariable@_@suffixSalt@:-@darwinMinVersion@}")
  80     fi
  81 fi