provide feedback if pre-compile fails

pkg/debian/changelog

@@ -1,3 +1,6 @@
+weewx (5.0.0rc3-4) unstable; urgency=low
+  * fix for pre-compile fails
+ -- Matthew Wall (weewx) <mwall@users.sourceforge.net>  Wed, 10 Jan 2024 23:57:51 -0500
 weewx (5.0.0rc3-3) unstable; urgency=low
   * added output to postinst to aid failure diagnostics
  -- Matthew Wall (weewx) <mwall@users.sourceforge.net>  Wed, 10 Jan 2024 20:24:04 -0500

pkg/debian/postinst

@@ -231,6 +231,15 @@ merge_weewxconf() {
     fi
 }
 
+# precompile the bytecode
+precompile() {
+    rc=$(python3 -m compileall -q -x 'user' /usr/share/weewx)
+    if [ "$rc" != "" ]; then
+        echo "Pre-compile failed!"
+        echo "$rc"
+    fi
+}
+
 # get the version number from the specified file, without the debian revisions
 get_conf_version() {
     v=$(grep '^version.*=' $1 | sed -e 's/\s*version\s*=\s*//' | sed -e 's/-.*//')
@@ -425,12 +434,8 @@ case "$1" in
         setup_user_dir
         setup_database_dir
         setup_reporting_dir
-
-        # precompile the bytecode
-        python3 -m compileall /usr/share/weewx > /dev/null
-
+        precompile
         set_permissions
-
         enable_init $pid1
         start_weewx $pid1
         ;;

pkg/weewx.spec.in

@@ -148,7 +148,11 @@ fi
 
 %post
 precompile() {
-    %{python} -m compileall %{dst_code_dir} > /dev/null
+    rc=$(%{python} -m compileall -q -x 'user' %{dst_code_dir})
+    if [ "$rc" != "" ]; then
+        echo "Pre-compile failed!"
+        echo "$rc"
+    fi
 }
 
 # get the version number from the specified file, without the rpm revisions