Add 'nixpkgs/' from commit 'abf060725d7614bd3b9f96764262dfbc2f9c2199'

git-subtree-dir: nixpkgs
git-subtree-mainline: 4e31070265257dc67d120c27e0f75c2344fdfa9a
git-subtree-split: abf060725d7614bd3b9f96764262dfbc2f9c2199

1 files changed, 47 insertions, 0 deletions

diff --git a/nixpkgs/pkgs/build-support/cc-wrapper/add-flags.sh b/nixpkgs/pkgs/build-support/cc-wrapper/add-flags.sh
new file mode 100644
index 000000000000..9762894607ac
--- /dev/null
+++ b/nixpkgs/pkgs/build-support/cc-wrapper/add-flags.sh
@@ -0,0 +1,47 @@
+# N.B. It may be a surprise that the derivation-specific variables are exported,
+# since this is just sourced by the wrapped binaries---the end consumers. This
+# is because one wrapper binary may invoke another (e.g. cc invoking ld). In
+# that case, it is cheaper/better to not repeat this step and let the forked
+# wrapped binary just inherit the work of the forker's wrapper script.
+
+var_templates_list=(
+    NIX+CFLAGS_COMPILE
+    NIX+CFLAGS_LINK
+    NIX+CXXSTDLIB_COMPILE
+    NIX+CXXSTDLIB_LINK
+)
+var_templates_bool=(
+    NIX+ENFORCE_NO_NATIVE
+)
+
+accumulateRoles
+
+# We need to mangle names for hygiene, but also take parameters/overrides
+# from the environment.
+for var in "${var_templates_list[@]}"; do
+    mangleVarList "$var" ${role_infixes[@]+"${role_infixes[@]}"}
+done
+for var in "${var_templates_bool[@]}"; do
+    mangleVarBool "$var" ${role_infixes[@]+"${role_infixes[@]}"}
+done
+
+# `-B@out@/bin' forces cc to use ld-wrapper.sh when calling ld.
+NIX_@infixSalt@_CFLAGS_COMPILE="-B@out@/bin/ $NIX_@infixSalt@_CFLAGS_COMPILE"
+
+# Export and assign separately in order that a failing $(..) will fail
+# the script.
+
+if [ -e @out@/nix-support/libc-cflags ]; then
+    NIX_@infixSalt@_CFLAGS_COMPILE="$(< @out@/nix-support/libc-cflags) $NIX_@infixSalt@_CFLAGS_COMPILE"
+fi
+
+if [ -e @out@/nix-support/cc-cflags ]; then
+    NIX_@infixSalt@_CFLAGS_COMPILE="$(< @out@/nix-support/cc-cflags) $NIX_@infixSalt@_CFLAGS_COMPILE"
+fi
+
+if [ -e @out@/nix-support/cc-ldflags ]; then
+    NIX_@infixSalt@_LDFLAGS+=" $(< @out@/nix-support/cc-ldflags)"
+fi
+
+# That way forked processes will not extend these environment variables again.
+export NIX_CC_WRAPPER_@infixSalt@_FLAGS_SET=1