stdenv setup: Always use both propagated files

This continues #23374, which always kept around both attributes, by
always including both propagated files: `propgated-native-build-inputs`
and `propagated-build-inputs`. `nativePkgs` and `crossPkgs` are still
defined as before, however, so this change should only barely
observable.

This is an incremental step to fully keeping the dependencies separate
in all cases.

pkgs/stdenv/generic/setup.sh

@@ -239,12 +239,12 @@ isScript() {
 
 # printf unfortunately will print a trailing newline regardless
 printLines() {
-    [[ "$#" -gt 0 ]] || return 0
+    (( "$#" > 0 )) || return 0
     printf '%s\n' "$@"
 }
 
 printWords() {
-    [[ "$#" -gt 0 ]] || return 0
+    (( "$#" > 0 )) || return 0
     printf '%s ' "$@"
 }
 
@@ -302,9 +302,9 @@ runHook addInputsHook
 
 # Recursively find all build inputs.
 findInputs() {
-    local pkg="$1"
-    local var="$2"
-    local propagatedBuildInputsFile="$3"
+    local pkg="$1"; shift
+    local var="$1"; shift
+    local propagatedBuildInputsFiles=("$@")
 
     # TODO(@Ericson2314): Restore using associative array once Darwin
     # nix-shell doesn't use impure bash. This should replace the O(n)
@@ -324,12 +324,16 @@ findInputs() {
         exit 1
     fi
 
-    if [ -f "$pkg/nix-support/$propagatedBuildInputsFile" ]; then
+    local file
+    for file in "${propagatedBuildInputsFiles[@]}"; do
+        file="$pkg/nix-support/$file"
+        [[ -f "$file" ]] || continue
+
         local pkgNext
-        for pkgNext in $(< "$pkg/nix-support/$propagatedBuildInputsFile"); do
-            findInputs "$pkgNext" "$var" "$propagatedBuildInputsFile"
+        for pkgNext in $(< "$file"); do
+            findInputs "$pkgNext" "$var" "${propagatedBuildInputsFiles[@]}"
         done
-    fi
+    done
 }
 
 # Add package to the future PATH and run setup hooks
@@ -362,26 +366,21 @@ if [ -z "${crossConfig:-}" ]; then
     for i in ${nativeBuildInputs:-} ${buildInputs:-} \
              ${defaultNativeBuildInputs:-} ${defaultBuildInputs:-} \
              ${propagatedNativeBuildInputs:-} ${propagatedBuildInputs:-}; do
-        findInputs "$i" nativePkgs propagated-native-build-inputs
-    done
-
-    for i in "${nativePkgs[@]}"; do
-        activatePackage "$i"
+        findInputs "$i" nativePkgs propagated-native-build-inputs propagated-build-inputs
     done
 else
-    for i in ${buildInputs:-} ${defaultBuildInputs:-} ${propagatedBuildInputs:-}; do
-        findInputs "$i" crossPkgs propagated-build-inputs
-    done
-
     for i in ${nativeBuildInputs:-} ${defaultNativeBuildInputs:-} ${propagatedNativeBuildInputs:-}; do
         findInputs "$i" nativePkgs propagated-native-build-inputs
     done
-
-    for i in "${nativePkgs[@]}" "${crossPkgs[@]}"; do
-        activatePackage "$i"
+    for i in ${buildInputs:-} ${defaultBuildInputs:-} ${propagatedBuildInputs:-}; do
+        findInputs "$i" crossPkgs propagated-build-inputs
     done
 fi
 
+for i in ${nativePkgs+"${nativePkgs[@]}"} ${crossPkgs+"${crossPkgs[@]}"}; do
+    activatePackage "$i"
+done
+
 
 # Set the relevant environment variables to point to the build inputs
 # found above.
@@ -898,31 +897,19 @@ fixupPhase() {
 
     # Propagate build inputs and setup hook into the development output.
 
-    if [ -z "${crossConfig:-}" ]; then
-        # Not cross-compiling - propagatedBuildInputs are handled identically to propagatedNativeBuildInputs
-        local propagated="$propagatedNativeBuildInputs"
-        if [ -n "${propagatedBuildInputs:-}" ]; then
-            propagated+="${propagated:+ }$propagatedBuildInputs"
-        fi
-        if [ -n "${propagated:-}" ]; then
-            mkdir -p "${!outputDev}/nix-support"
-            # shellcheck disable=SC2086
-            printWords $propagated > "${!outputDev}/nix-support/propagated-native-build-inputs"
-        fi
-    else
-        if [ -n "${propagatedBuildInputs:-}" ]; then
-            mkdir -p "${!outputDev}/nix-support"
-            # shellcheck disable=SC2086
-            printWords $propagatedBuildInputs > "${!outputDev}/nix-support/propagated-build-inputs"
-        fi
-
-        if [ -n "${propagatedNativeBuildInputs:-}" ]; then
-            mkdir -p "${!outputDev}/nix-support"
-            # shellcheck disable=SC2086
-            printWords $propagatedNativeBuildInputs > "${!outputDev}/nix-support/propagated-native-build-inputs"
-        fi
+    if [ -n "${propagatedBuildInputs:-}" ]; then
+        mkdir -p "${!outputDev}/nix-support"
+        # shellcheck disable=SC2086
+        printWords $propagatedBuildInputs > "${!outputDev}/nix-support/propagated-build-inputs"
     fi
 
+    if [ -n "${propagatedNativeBuildInputs:-}" ]; then
+        mkdir -p "${!outputDev}/nix-support"
+        # shellcheck disable=SC2086
+        printWords $propagatedNativeBuildInputs > "${!outputDev}/nix-support/propagated-native-build-inputs"
+    fi
+
+
     if [ -n "${setupHook:-}" ]; then
         mkdir -p "${!outputDev}/nix-support"
         substituteAll "$setupHook" "${!outputDev}/nix-support/setup-hook"