[Bug 3205320]: stack space detection defeated by inlining

3 files changed, 15 insertions, 6 deletions

diff --git a/ChangeLog b/ChangeLog
index 781589c..cd908d6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2011-03-10  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* unix/configure.in  [Bug 3205320]: stack space detection defeated by inlining
+	* unix/configure:    (autoconf-2.59)
+
 2011-03-09  Don Porter  <dgp@users.sourceforge.net>
 
 	* generic/tclNamesp.c:	Tighten the detector of nested [namespace code]
diff --git a/unix/configure b/unix/configure
index 8fbaebc..96e50d9 100755
--- a/unix/configure
+++ b/unix/configure
@@ -18734,11 +18734,13 @@ cat >>conftest.$ac_ext <<_ACEOF
 
 	int StackGrowsUp(int *parent) {
 	    int here;
-	    return (&here < parent);
+	    if (parent)
+		return (&here < parent);
+	    else
+		return StackGrowsUp(&here);
 	}
 	int main (int argc, char *argv[]) {
-	    int foo;
-	    return StackGrowsUp(&foo);
+	    return StackGrowsUp(0);
 	}
 
 _ACEOF
diff --git a/unix/configure.in b/unix/configure.in
index 87731a1..473758d 100644
--- a/unix/configure.in
+++ b/unix/configure.in
@@ -705,11 +705,13 @@ AC_CACHE_CHECK([if the C stack grows upwards in memory], tcl_cv_stack_grows_up,
     AC_TRY_RUN([
 	int StackGrowsUp(int *parent) {
 	    int here;
-	    return (&here < parent);
+	    if (parent)
+		return (&here < parent);
+	    else
+		return StackGrowsUp(&here);
 	}
 	int main (int argc, char *argv[]) {
-	    int foo;
-	    return StackGrowsUp(&foo);
+	    return StackGrowsUp(0);
 	}
     ], tcl_cv_stack_grows_up=yes, tcl_cv_stack_grows_up=no,
     tcl_cv_stack_grows_up=unknown)])