From a27abab65f427507258b142862bcb7e28a90adc3 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Tue, 31 Oct 2023 08:10:41 -0400
Subject: [PATCH] Fix PCH to recompile on version change

---
 configure.ac            | 4 ++++
 src/config_package.h.in | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/configure.ac b/configure.ac
index ade69cf7a..ab5c9f98a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,6 +24,10 @@ AC_SUBST(PACKAGE_VERSION_NUMBER)
 AC_DEFINE_UNQUOTED([PACKAGE_VERSION_NUMBER_STRING],["$PACKAGE_VERSION_NUMBER"],[Package version as a number])
 VERILATOR_VERSION_INTEGER=`AS_ECHO("$PACKAGE_VERSION") | [sed 's/\([0-9]\)\.\([0-9][0-9][0-9]\) .*/\1\2000/g']`
 AC_SUBST(VERILATOR_VERSION_INTEGER)
+AC_DEFINE_UNQUOTED([PACKAGE_VERSION_STRING_CHAR],
+        [static const char* const PACKAGE_STRING_UNUSED = "$PACKAGE_STRING";],
+        [Package version as a number])
+AC_SUBST(PACKAGE_VERSION_STRING_CHAR)
 
 # Ignore automake flags passed by Ubuntu builds
 AC_ARG_ENABLE([dependency-tracking],
diff --git a/src/config_package.h.in b/src/config_package.h.in
index 25ccf8816..4588746aa 100644
--- a/src/config_package.h.in
+++ b/src/config_package.h.in
@@ -19,6 +19,14 @@
 #define PACKAGE_VERSION_NUMBER_STRING "0.000"
 // Otherwise Autoheader generates it (with all the same macros and more)
 
+// Force ccache recompilation on PACKAGE_STRING change
+#ifndef VL_CPPCHECK
+#ifndef PACKAGE_VERSION_STRING_CHAR
+#define PACKAGE_VERSION_STRING_CHAR
+PACKAGE_VERSION_STRING_CHAR
+#endif
+#endif
+
 //**********************************************************************
 //**** Configure-discovered library options