pkgs/build-support/cc-wrapper/add-flags.sh

   1 # N.B. It may be a surprise that the derivation-specific variables are exported,
   2 # since this is just sourced by the wrapped binaries---the end consumers. This
   3 # is because one wrapper binary may invoke another (e.g. cc invoking ld). In
   4 # that case, it is cheaper/better to not repeat this step and let the forked
   5 # wrapped binary just inherit the work of the forker's wrapper script.
   6
   7 var_templates_list=(
   8     NIX_CFLAGS_COMPILE
   9     NIX_CFLAGS_COMPILE_BEFORE
  10     NIX_CFLAGS_LINK
  11     NIX_CXXSTDLIB_COMPILE
  12     NIX_CXXSTDLIB_LINK
  13     NIX_GNATFLAGS_COMPILE
  14 )
  15 var_templates_bool=(
  16     NIX_ENFORCE_NO_NATIVE
  17 )
  18
  19 accumulateRoles
  20
  21 # We need to mangle names for hygiene, but also take parameters/overrides
  22 # from the environment.
  23 for var in "${var_templates_list[@]}"; do
  24     mangleVarList "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
  25 done
  26 for var in "${var_templates_bool[@]}"; do
  27     mangleVarBool "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
  28 done
  29
  30 # Arocc does not support "-B"
  31 if [[ -z "@isArocc@" ]]; then
  32     # `-B@bintools@/bin' forces cc to use ld-wrapper.sh when calling ld.
  33     NIX_CFLAGS_COMPILE_@suffixSalt@="-B@bintools@/bin/ $NIX_CFLAGS_COMPILE_@suffixSalt@"
  34 fi
  35
  36 # Export and assign separately in order that a failing $(..) will fail
  37 # the script.
  38
  39 # Currently bootstrap-tools does not split glibc, and gcc files into
  40 # separate directories. As a workaround we want resulting cflags to be
  41 # ordered as: crt1-cflags libc-cflags cc-cflags. Otherwise we mix crt/libc.so
  42 # from different libc as seen in
  43 #   https://github.com/NixOS/nixpkgs/issues/158042
  44 #
  45 # Note that below has reverse ordering as we prepend flags one-by-one.
  46 # Once bootstrap-tools is split into different directories we can stop
  47 # relying on flag ordering below.
  48
  49 if [ -e @out@/nix-support/cc-cflags ]; then
  50     NIX_CFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/cc-cflags) $NIX_CFLAGS_COMPILE_@suffixSalt@"
  51 fi
  52
  53 if [[ "$cInclude" = 1 ]] && [ -e @out@/nix-support/libc-cflags ]; then
  54     NIX_CFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/libc-cflags) $NIX_CFLAGS_COMPILE_@suffixSalt@"
  55 fi
  56
  57 if [ -e @out@/nix-support/libc-crt1-cflags ]; then
  58     NIX_CFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/libc-crt1-cflags) $NIX_CFLAGS_COMPILE_@suffixSalt@"
  59 fi
  60
  61 if [ -e @out@/nix-support/libcxx-cxxflags ]; then
  62     NIX_CXXSTDLIB_COMPILE_@suffixSalt@+=" $(< @out@/nix-support/libcxx-cxxflags)"
  63 fi
  64
  65 if [ -e @out@/nix-support/libcxx-ldflags ]; then
  66     NIX_CXXSTDLIB_LINK_@suffixSalt@+=" $(< @out@/nix-support/libcxx-ldflags)"
  67 fi
  68
  69 if [ -e @out@/nix-support/gnat-cflags ]; then
  70     NIX_GNATFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/gnat-cflags) $NIX_GNATFLAGS_COMPILE_@suffixSalt@"
  71 fi
  72
  73 if [ -e @out@/nix-support/cc-ldflags ]; then
  74     NIX_LDFLAGS_@suffixSalt@+=" $(< @out@/nix-support/cc-ldflags)"
  75 fi
  76
  77 if [ -e @out@/nix-support/cc-cflags-before ]; then
  78     NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@="$(< @out@/nix-support/cc-cflags-before) $NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@"
  79 fi
  80
  81 # Only add darwin min version flag and set up `DEVELOPER_DIR` if a default darwin min version is set,
  82 # which is a signal that we're targetting darwin.
  83 if [ "@darwinMinVersion@" ]; then
  84     mangleVarSingle @darwinMinVersionVariable@ ${role_suffixes[@]+"${role_suffixes[@]}"}
  85
  86     NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@="-m@darwinPlatformForCC@-version-min=${@darwinMinVersionVariable@_@suffixSalt@:-@darwinMinVersion@} $NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@"
  87
  88     # `DEVELOPER_DIR` is used to dynamically locate libSystem (and the SDK frameworks) based on the SDK at that path.
  89     mangleVarSingle DEVELOPER_DIR ${role_suffixes[@]+"${role_suffixes[@]}"}
  90
  91     # Allow wrapped compilers to do something useful when no `DEVELOPER_DIR` is set, which can happen when
  92     # the compiler is run outside of a stdenv or intentionally in an environment with no environment variables set.
  93     DEVELOPER_DIR=${DEVELOPER_DIR_@suffixSalt@:-@fallback_sdk@}
  94
  95     # xcbuild needs `SDKROOT` to be the name of the SDK, which it sets in its own wrapper,
  96     # but compilers expect it to point to the absolute path.
  97     SDKROOT="$DEVELOPER_DIR/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk"
  98
  99     # Set up various library paths since compilers may not support (or may have disabled) finding them in the sysroot.
 100     NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@+=" -isysroot $SDKROOT"
 101     NIX_CFLAGS_COMPILE_@suffixSalt@+=" -idirafter $SDKROOT/usr/include"
 102     NIX_CFLAGS_COMPILE_@suffixSalt@+=" -iframework $SDKROOT/System/Library/Frameworks"
 103 fi
 104
 105 # That way forked processes will not extend these environment variables again.
 106 export NIX_CC_WRAPPER_FLAGS_SET_@suffixSalt@=1