diff -r 767fe7a007f7 -r ae763178ee1e make/toolchain.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/toolchain.sh	Fri Sep 22 23:26:23 2023 +0200
@@ -0,0 +1,186 @@
+#!/bin/sh
+#
+# toolchain detection
+#
+
+C_COMPILERS="gcc clang suncc cc"
+CPP_COMPILERS="g++ clang++ sunCC CC"
+unset TOOLCHAIN_NAME
+unset TOOLCHAIN_CC
+unset TOOLCHAIN_CXX
+
+check_c_compiler()
+{
+	cat > "$TEMP_DIR/test.c" << __EOF__
+/* test file */
+#include <stdio.h>
+int main(int argc, char **argv) {
+#if defined(__clang__)
+	printf("clang\n");
+#elif defined(__GNUC__)
+	printf("gcc\n");
+#elif defined(__sun)
+	printf("suncc\n");
+#else
+	printf("unknown\n");
+#endif
+	return 0;
+}
+__EOF__
+	rm -f "$TEMP_DIR/checkcc"
+	$1 -o "$TEMP_DIR/checkcc" $CFLAGS $LDFLAGS "$TEMP_DIR/test.c" 2> /dev/null
+}
+
+check_cpp_compiler()
+{
+	cat > "$TEMP_DIR/test.cpp" << __EOF__
+/* test file */
+#include <iostream>
+int main(int argc, char **argv) {
+#if defined(__clang__)
+	std::cout << "clang" << std::endl;
+#elif defined(__GNUC__)
+	std::cout << "gcc" << std::endl;
+#elif defined(__sun)
+	std::cout << "suncc" << std::endl;
+#else
+	std::cout << "cc" << std::endl;
+#endif
+	return 0;
+}
+__EOF__
+	rm -f "$TEMP_DIR/checkcc"
+	$1 -o "$TEMP_DIR/checkcc" $CXXFLAGS $LDFLAGS "$TEMP_DIR/test.cpp" 2> /dev/null
+}
+
+create_libtest_source()
+{
+  # $1: filename
+  # $2: optional include
+	cat > "$TEMP_DIR/$1" << __EOF__
+/* libtest file */
+int main(int argc, char **argv) {
+	return 0;
+}
+__EOF__
+  if [ -n "$2" ]; then
+    echo "#include <$2>" >> "$TEMP_DIR/$1"
+  fi
+}
+
+check_c_lib()
+{
+  # $1: libname
+  # $2: optional include
+  if [ -z "$TOOLCHAIN_CC" ]; then
+    return 1
+  fi
+  create_libtest_source "test.c" "$2"
+  rm -f "$TEMP_DIR/checklib"
+	$TOOLCHAIN_CC -o "$TEMP_DIR/checklib" $CFLAGS $LDFLAGS "-l$1" "$TEMP_DIR/test.c" 2> /dev/null
+}
+
+check_cpp_lib()
+{
+  # $1: libname
+  # $2: optional include
+  if [ -z "$TOOLCHAIN_CXX" ]; then
+    return 1
+  fi
+	create_libtest_source "test.cpp" "$2"
+  rm -f "$TEMP_DIR/checklib"
+	$TOOLCHAIN_CXX -o "$TEMP_DIR/checklib" $CXXFLAGS $LDFLAGS "-l$1" "$TEMP_DIR/test.cpp" 2> /dev/null
+}
+
+check_lib()
+{
+  # $1: libname
+  # $2: optional include
+	if [ -n "$TOOLCHAIN_CC" ]; then
+		check_c_lib "$1" "$2"
+	elif  [ -n "$TOOLCHAIN_CXX" ]; then
+	  check_cpp_lib "$1" "$2"
+	fi
+}
+
+detect_c_compiler()
+{
+  if [ -n "$TOOLCHAIN_CC" ]; then
+    return 0
+  fi
+  printf "detect C compiler... "
+  if [ -n "$CC" ]; then
+    if check_c_compiler "$CC"; then
+      TOOLCHAIN_CC=$CC
+      TOOLCHAIN_NAME=`"$TEMP_DIR/checkcc"`
+      echo "$CC"
+      return 0
+    else
+      echo "$CC is not a working C compiler"
+      return 1
+    fi
+  else
+    for COMP in $C_COMPILERS
+    do
+      if check_c_compiler "$COMP"; then
+        TOOLCHAIN_CC=$COMP
+        TOOLCHAIN_NAME=`"$TEMP_DIR/checkcc"`
+        echo "$COMP"
+        return 0
+      fi
+    done
+    echo "not found"
+    return 1
+  fi
+}
+
+detect_cpp_compiler()
+{
+  if [ -n "$TOOLCHAIN_CXX" ]; then
+    return 0
+  fi
+  printf "detect C++ compiler... "
+
+  if [ -n "$CXX" ]; then
+    if check_cpp_compiler "$CXX"; then
+      TOOLCHAIN_CXX=$CXX
+      TOOLCHAIN_NAME=`"$TEMP_DIR/checkcc"`
+      echo "$CXX"
+      return 0
+    else
+      echo "$CXX is not a working C++ compiler"
+      return 1
+    fi
+  else
+    for COMP in $CPP_COMPILERS
+    do
+      if check_cpp_compiler "$COMP"; then
+        TOOLCHAIN_CXX=$COMP
+        TOOLCHAIN_NAME=`"$TEMP_DIR/checkcc"`
+        echo "$COMP"
+        return 0
+      fi
+    done
+    echo "${TOOLCHAIN_CXX:-"not found"}"
+    return 1
+  fi
+}
+
+write_toolchain_defaults()
+{
+  echo "# toolchain" >> "$1"
+  if [ -n "$TOOLCHAIN_CC" ]; then
+    echo "CC = ${TOOLCHAIN_CC}" >> "$1"
+  fi
+  if [ -n "$TOOLCHAIN_CXX" ]; then
+    echo "CXX = ${TOOLCHAIN_CXX}" >> "$1"
+  fi
+  echo >> "$1"
+  if [ -f "make/${TOOLCHAIN_NAME}.mk" ]; then
+    cat "make/${TOOLCHAIN_NAME}.mk" >> "$1"
+  elif [ -f "make/cc.mk" ]; then
+    cat "make/cc.mk" >> "$1"
+  else
+    echo "!!! WARNING !!! Default toolchain flags not found. Configuration might be incomplete."
+  fi
+}