1 files changed, 71 insertions, 0 deletions
diff --git a/gcc/mkconfig.sh b/gcc/mkconfig.sh
new file mode 100644
index 00000000000..03c1d9d4ffc
--- /dev/null
+++ b/gcc/mkconfig.sh
@@ -0,0 +1,71 @@
+#! /bin/sh
+
+# Generate gcc's config.h, which is not your normal autoconf-generated
+# config.h (that's auto-(host|build).h).  $1 is the file to generate.
+# HEADERS, DEFINES, and possibly TARGET_CPU_DEFAULT are expected to be
+# set in the environment.
+
+if [ -z "$1" ]; then
+    echo "Usage: HEADERS='list' DEFINES='list' mkconfig.sh FILE" >&2
+    exit 1
+fi
+
+output=$1
+rm -f $output.T
+
+# We used to exec > $output.T but apparently this has bugs.
+# Use a redirected subshell instead.
+(
+
+# Define TARGET_CPU_DEFAULT if the system wants one.
+# This substitutes for lots of *.h files.
+if [ "$TARGET_CPU_DEFAULT" != "" ]; then
+    echo "#define TARGET_CPU_DEFAULT ($TARGET_CPU_DEFAULT)"
+fi
+
+# The first entry in HEADERS may be auto-host.h or auto-build.h;
+# it wants to be included even when not -DIN_GCC.
+if [ -n "$HEADERS" ]; then
+    set $HEADERS; first=$1
+    case $first in auto-* )
+	echo "#include \"$first\""
+	shift
+	HEADERS=$*
+	;;
+    esac
+fi
+
+if [ -n "$HEADERS" ]; then
+    echo '#ifdef IN_GCC'
+    for file in $HEADERS; do
+	echo "# include \"$file\""
+    done
+    echo '#endif'
+fi
+
+for def in $DEFINES; do
+    echo "#ifndef $def" | sed 's/=.*//'
+    echo "# define $def" | sed 's/=/ /'
+    echo "#endif"
+done
+
+# Include insn-codes.h last, because it includes machmode.h,
+# and we want EXTRA_CC_MODES to be taken into account.
+echo "#ifndef GENERATOR_FILE"
+echo "#include \"insn-codes.h\""
+echo "#include \"insn-flags.h\""
+echo "#endif"
+
+) > $output.T
+
+# Avoid changing the actual file if possible.
+if [ -f $output ] && cmp $output.T $output >/dev/null 2>&1; then
+    echo $output is unchanged >&2
+    rm -f $output.T
+else
+    mv -f $output.T $output
+fi
+
+# Touch a stamp file for Make's benefit.
+rm -f cs-$output
+echo timestamp > cs-$output