X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/79ba130cb5776f994f6a3f0f87159d8cbc5ff129..09e500b22fc6250ba458d26a9dd7e6571d2c79d8:/genmodes

diff --git a/genmodes b/genmodes
index a69229a..76b82a6 100755
--- a/genmodes
+++ b/genmodes
@@ -1,5 +1,6 @@
 #! /bin/sh
 
+set -e
 baselist=$1
 extlist=$2
 
@@ -8,7 +9,7 @@ for i in $baselist; do
   for j in $extlist; do
     J=`echo "$j" | tr -d '\n' | tr a-z A-Z | tr -c a-zA-Z0-9 _`
     guard="CATACOMB_${I}_${J}_H"
-    cat >$i-$j.h <<EOF
+    cat >$i-$j.h.new <<EOF
 /* -*-c-*-
  *
  * $i-$j.h [generated]
@@ -37,7 +38,13 @@ ${J}_DECL($I, $i)
 
 #endif
 EOF
-    cat >$i-$j.c <<EOF
+    if cmp "$i-$j.h" "$i-$j.h.new" >/dev/null 2>&1; then
+      rm "$i-$j.h.new"
+    else
+      mv "$i-$j.h.new" "$i-$j.h"
+      echo >&2 "Written new $i-$j.h."
+    fi
+    cat >$i-$j.c.new <<EOF
 /* -*-c-*-
  *
  * $i-$j.c [generated]
@@ -47,5 +54,11 @@ EOF
 #include "$j-def.h"
 ${J}_DEF($I, $i)
 EOF
+    if cmp "$i-$j.c" "$i-$j.c.new" >/dev/null 2>&1; then
+      rm "$i-$j.c.new"
+    else
+      mv "$i-$j.c.new" "$i-$j.c"
+      echo >&2 "Written new $i-$j.c."
+    fi
   done
 done