From 5f655475e956af645508076e3906385dfd414a11 Mon Sep 17 00:00:00 2001
From: UebelAndre <github@uebelandre.com>
Date: Tue, 19 Aug 2025 07:29:30 -0700
Subject: [PATCH] Update cc_wrapper templates to posix shell.

---
 cc/private/toolchain/linux_cc_wrapper.sh.tpl |  41 +++---
 cc/private/toolchain/osx_cc_wrapper.sh.tpl   | 145 +++++++++++--------
 2 files changed, 109 insertions(+), 77 deletions(-)

diff --git a/cc/private/toolchain/linux_cc_wrapper.sh.tpl b/cc/private/toolchain/linux_cc_wrapper.sh.tpl
index 1d030d4a..29fb3794 100644
--- a/cc/private/toolchain/linux_cc_wrapper.sh.tpl
+++ b/cc/private/toolchain/linux_cc_wrapper.sh.tpl
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 #
 # Copyright 2015 The Bazel Authors. All rights reserved.
 #
@@ -20,26 +20,31 @@ set -eu
 
 OUTPUT=
 
-function parse_option() {
-    local -r opt="$1"
-    if [[ "${OUTPUT}" = "1" ]]; then
+parse_option() {
+    opt=$1
+    if [ "$OUTPUT" = "1" ]; then
         OUTPUT=$opt
-    elif [[ "$opt" = "-o" ]]; then
+    elif [ "$opt" = "-o" ]; then
         # output is coming
         OUTPUT=1
     fi
 }
 
-# let parse the option list
+# parse the option list
 for i in "$@"; do
-    if [[ "$i" = @* && -r "${i:1}" ]]; then
-        while IFS= read -r opt
-        do
-            parse_option "$opt"
-        done < "${i:1}" || exit 1
-    else
-        parse_option "$i"
-    fi
+    case $i in
+        @*)
+            file=${i#@}
+            if [ -r "$file" ]; then
+                while IFS= read -r opt; do
+                    parse_option "$opt"
+                done < "$file" || exit 1
+            fi
+            ;;
+        *)
+            parse_option "$i"
+            ;;
+    esac
 done
 
 # Set-up the environment
@@ -49,6 +54,8 @@ done
 %{cc} "$@"
 
 # Generate an empty file if header processing succeeded.
-if [[ "${OUTPUT}" == *.h.processed ]]; then
-  echo -n > "${OUTPUT}"
-fi
+case $OUTPUT in
+    *.h.processed)
+        : > "$OUTPUT"
+        ;;
+esac
diff --git a/cc/private/toolchain/osx_cc_wrapper.sh.tpl b/cc/private/toolchain/osx_cc_wrapper.sh.tpl
index 0a2d5689..62f5ff68 100644
--- a/cc/private/toolchain/osx_cc_wrapper.sh.tpl
+++ b/cc/private/toolchain/osx_cc_wrapper.sh.tpl
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 #
 # Copyright 2015 The Bazel Authors. All rights reserved.
 #
@@ -33,21 +33,36 @@ LIB_DIRS=
 RPATHS=
 OUTPUT=
 
-function parse_option() {
-    local -r opt="$1"
-    if [[ "${OUTPUT}" = "1" ]]; then
+XCRUN=/usr/bin/xcrun
+[ -x "$XCRUN" ] || XCRUN="xcrun"
+
+DIRNAME=/usr/bin/dirname
+[ -x "$DIRNAME" ] || DIRNAME="dirname"
+
+BASENAME=/usr/bin/basename
+[ -x "$BASENAME" ] || BASENAME="basename"
+
+READLINK=/usr/bin/readlink
+[ -x "$READLINK" ] || READLINK="readlink"
+
+SED=/usr/bin/sed
+[ -x "$SED" ] || SED="sed"
+
+parse_option() {
+    opt=$1
+    if [ "$OUTPUT" = "1" ]; then
         OUTPUT=$opt
-    elif [[ "$opt" =~ ^-l(.*)$ ]]; then
-        LIBS="${BASH_REMATCH[1]} $LIBS"
-    elif [[ "$opt" =~ ^(.*)\.so$ ]]; then
-        LIB_PATHS="${opt} $LIB_PATHS"
-    elif [[ "$opt" =~ ^(.*)\.dylib$ ]]; then
-        LIB_PATHS="${opt} $LIB_PATHS"
-    elif [[ "$opt" =~ ^-L(.*)$ ]]; then
-        LIB_DIRS="${BASH_REMATCH[1]} $LIB_DIRS"
-    elif [[ "$opt" =~ ^\@loader_path/(.*)$ ]]; then
-        RPATHS="${BASH_REMATCH[1]} ${RPATHS}"
-    elif [[ "$opt" = "-o" ]]; then
+    elif [ "${opt#-l}" != "$opt" ]; then
+        LIBS="${opt#-l} $LIBS"
+    elif [ "${opt%.so}" != "$opt" ]; then
+        LIB_PATHS="$opt $LIB_PATHS"
+    elif [ "${opt%.dylib}" != "$opt" ]; then
+        LIB_PATHS="$opt $LIB_PATHS"
+    elif [ "${opt#-L}" != "$opt" ]; then
+        LIB_DIRS="${opt#-L} $LIB_DIRS"
+    elif [ "${opt#@loader_path/}" != "$opt" ]; then
+        RPATHS="${opt#@loader_path/} $RPATHS"
+    elif [ "$opt" = "-o" ]; then
         # output is coming
         OUTPUT=1
     fi
@@ -55,14 +70,19 @@ function parse_option() {
 
 # let parse the option list
 for i in "$@"; do
-    if [[ "$i" = @* && -r "${i:1}" ]]; then
-        while IFS= read -r opt
-        do
-            parse_option "$opt"
-        done < "${i:1}" || exit 1
-    else
-        parse_option "$i"
-    fi
+    case $i in
+        @*)
+            file=${i#@}
+            if [ -r "$file" ]; then
+                while IFS= read -r opt; do
+                    parse_option "$opt"
+                done < "$file" || exit 1
+            fi
+            ;;
+        *)
+            parse_option "$i"
+            ;;
+    esac
 done
 
 # Set-up the environment
@@ -72,66 +92,71 @@ done
 %{cc} "$@"
 
 # Generate an empty file if header processing succeeded.
-if [[ "${OUTPUT}" == *.h.processed ]]; then
-  echo -n > "${OUTPUT}"
-fi
-
-function get_library_path() {
-    for libdir in ${LIB_DIRS}; do
-        if [ -f ${libdir}/lib$1.so ]; then
-            echo "${libdir}/lib$1.so"
-        elif [ -f ${libdir}/lib$1.dylib ]; then
-            echo "${libdir}/lib$1.dylib"
+case $OUTPUT in
+    *.h.processed)
+        : > "$OUTPUT"
+        ;;
+esac
+
+get_library_path() {
+    lib=$1
+    for libdir in $LIB_DIRS; do
+        if [ -f "$libdir/lib$lib.so" ]; then
+            echo "$libdir/lib$lib.so"
+            return
+        elif [ -f "$libdir/lib$lib.dylib" ]; then
+            echo "$libdir/lib$lib.dylib"
+            return
         fi
     done
 }
 
 # A convenient method to return the actual path even for non symlinks
 # and multi-level symlinks.
-function get_realpath() {
-    local previous="$1"
-    local next=$(readlink "${previous}")
-    while [ -n "${next}" ]; do
-        previous="${next}"
-        next=$(readlink "${previous}")
+get_realpath() {
+    previous=$1
+    next=$($READLINK "$previous" 2>/dev/null || true)
+    while [ -n "$next" ]; do
+        previous=$next
+        next=$($READLINK "$previous" 2>/dev/null || true)
     done
-    echo "${previous}"
+    echo "$previous"
 }
 
 # Get the path of a lib inside a tool
-function get_otool_path() {
+get_otool_path() {
     # the lib path is the path of the original lib relative to the workspace
-    get_realpath $1 | sed 's|^.*/bazel-out/|bazel-out/|'
+    get_realpath "$1" | $SED 's|^.*/bazel-out/|bazel-out/|'
 }
 
-function call_install_name() {
-    /usr/bin/xcrun install_name_tool -change $(get_otool_path "$1") \
-        "@loader_path/$2/$3" "${OUTPUT}"
+call_install_name() {
+    $XCRUN install_name_tool -change "$(get_otool_path "$1")" \
+        "@loader_path/$2/$3" "$OUTPUT"
 }
 
 # Do replacements in the output
-for rpath in ${RPATHS}; do
-    for lib in ${LIBS}; do
-        unset libname
-        if [ -f "$(/usr/bin/dirname ${OUTPUT})/${rpath}/lib${lib}.so" ]; then
-            libname="lib${lib}.so"
-        elif [ -f "$(/usr/bin/dirname ${OUTPUT})/${rpath}/lib${lib}.dylib" ]; then
-            libname="lib${lib}.dylib"
+for rpath in $RPATHS; do
+    for lib in $LIBS; do
+        libname=
+        if [ -f "$($DIRNAME "$OUTPUT")/$rpath/lib$lib.so" ]; then
+            libname="lib$lib.so"
+        elif [ -f "$($DIRNAME "$OUTPUT")/$rpath/lib$lib.dylib" ]; then
+            libname="lib$lib.dylib"
         fi
         # ${libname-} --> return $libname if defined, or undefined otherwise. This is to make
         # this set -e friendly
-        if [[ -n "${libname-}" ]]; then
-            libpath=$(get_library_path ${lib})
-            if [ -n "${libpath}" ]; then
-                call_install_name "${libpath}" "${rpath}" "${libname}"
+        if [ -n "$libname" ]; then
+            libpath=$(get_library_path "$lib")
+            if [ -n "$libpath" ]; then
+                call_install_name "$libpath" "$rpath" "$libname"
             fi
         fi
     done
-    for libpath in ${LIB_PATHS}; do
+    for libpath in $LIB_PATHS; do
         if [ -f "$libpath" ]; then
-            libname=$(/usr/bin/basename "$libpath")
-            if [ -f "$(/usr/bin/dirname ${OUTPUT})/${rpath}/${libname}" ]; then
-                call_install_name "${libpath}" "${rpath}" "${libname}"
+            libname=$($BASENAME "$libpath")
+            if [ -f "$($DIRNAME "$OUTPUT")/$rpath/$libname" ]; then
+                call_install_name "$libpath" "$rpath" "$libname"
             fi
         fi
     done