tjh.dev
Clone of https://github.com/NixOS/nixpkgs.git (to stress-test knotserver)
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
7var_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)
15var_templates_bool=(
16 NIX_ENFORCE_NO_NATIVE
17)
18
19accumulateRoles
20
21# We need to mangle names for hygiene, but also take parameters/overrides
22# from the environment.
23for var in "${var_templates_list[@]}"; do
24 mangleVarList "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
25done
26for var in "${var_templates_bool[@]}"; do
27 mangleVarBool "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
28done
29
30# Prepending `@bintools@/bin' to $PATH forces cc to use ld-wrapper.sh when calling ld.
31# $path_backup is where cc-wrapper.sh stores the $PATH that will be used for the
32# compiler invocation.
33path_backup="@bintools@/bin:$path_backup"
34
35# Export and assign separately in order that a failing $(..) will fail
36# the script.
37
38# Currently bootstrap-tools does not split glibc, and gcc files into
39# separate directories. As a workaround we want resulting cflags to be
40# ordered as: crt1-cflags libc-cflags cc-cflags. Otherwise we mix crt/libc.so
41# from different libc as seen in
42# https://github.com/NixOS/nixpkgs/issues/158042
43#
44# Note that below has reverse ordering as we prepend flags one-by-one.
45# Once bootstrap-tools is split into different directories we can stop
46# relying on flag ordering below.
47
48if [ -e @out@/nix-support/cc-cflags ]; then
49 NIX_CFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/cc-cflags) $NIX_CFLAGS_COMPILE_@suffixSalt@"
50fi
51
52if [[ "$cInclude" = 1 ]] && [ -e @out@/nix-support/libc-cflags ]; then
53 NIX_CFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/libc-cflags) $NIX_CFLAGS_COMPILE_@suffixSalt@"
54fi
55
56if [ -e @out@/nix-support/libc-crt1-cflags ]; then
57 NIX_CFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/libc-crt1-cflags) $NIX_CFLAGS_COMPILE_@suffixSalt@"
58fi
59
60if [ -e @out@/nix-support/libcxx-cxxflags ]; then
61 NIX_CXXSTDLIB_COMPILE_@suffixSalt@+=" $(< @out@/nix-support/libcxx-cxxflags)"
62fi
63
64if [ -e @out@/nix-support/libcxx-ldflags ]; then
65 NIX_CXXSTDLIB_LINK_@suffixSalt@+=" $(< @out@/nix-support/libcxx-ldflags)"
66fi
67
68if [ -e @out@/nix-support/gnat-cflags ]; then
69 NIX_GNATFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/gnat-cflags) $NIX_GNATFLAGS_COMPILE_@suffixSalt@"
70fi
71
72if [ -e @out@/nix-support/cc-ldflags ]; then
73 NIX_LDFLAGS_@suffixSalt@+=" $(< @out@/nix-support/cc-ldflags)"
74fi
75
76if [ -e @out@/nix-support/cc-cflags-before ]; then
77 NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@="$(< @out@/nix-support/cc-cflags-before) $NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@"
78fi
79
80# Only add darwin min version flag if a default darwin min version is set,
81# which is a signal that we're targetting darwin.
82if [ "@darwinMinVersion@" ]; then
83 mangleVarSingle @darwinMinVersionVariable@ ${role_suffixes[@]+"${role_suffixes[@]}"}
84
85 NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@="-m@darwinPlatformForCC@-version-min=${@darwinMinVersionVariable@_@suffixSalt@:-@darwinMinVersion@} $NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@"
86fi
87
88# That way forked processes will not extend these environment variables again.
89export NIX_CC_WRAPPER_FLAGS_SET_@suffixSalt@=1