From: Martin Quinson <martin.quinson@loria.fr>
Date: Fri, 12 Feb 2016 21:02:46 +0000 (+0100)
Subject: try to fix the stack growth direction on non-amd64
X-Git-Tag: v3_13~848^2~2
X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/commitdiff_plain/ce8b16ee0f1aa0c7cae442128269f619e979d2d0

try to fix the stack growth direction on non-amd64
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index da56fb80eb..34badcaaeb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -738,11 +738,12 @@ endif()
 
 ### check for stackgrowth
 if (NOT CMAKE_CROSSCOMPILING)
-  try_run(RUN_makecontext_VAR COMPILE_makecontext_VAR
+  try_run(RUN_stackgrowth_VAR COMPILE_stackgrowth_VAR
     ${CMAKE_BINARY_DIR}
     ${CMAKE_HOME_DIRECTORY}/tools/cmake/test_prog/prog_stackgrowth.c
     RUN_OUTPUT_VARIABLE stack
-    )
+    COPY_FILE test_stackgrowth
+  )
 endif()
 if("${stack}" STREQUAL "down")
   set(PTH_STACKGROWTH "-1")
diff --git a/tools/cmake/test_prog/prog_stackgrowth.c b/tools/cmake/test_prog/prog_stackgrowth.c
index f005341f04..d75dde534e 100644
--- a/tools/cmake/test_prog/prog_stackgrowth.c
+++ b/tools/cmake/test_prog/prog_stackgrowth.c
@@ -10,12 +10,20 @@
 static int iterate = 10;
 static int growsdown(int *x)
 {
-  int y;
-  y = (x > &y);
+  int y = (x > &y);
+   
   if (--iterate > 0)
     y = growsdown(&y);
-  if (y != (x > &y))
+
+  /* The stack sometimes changes at the 0th level. 
+   * Original version did fail in this case, but I changed this around SimGrid 3.13 because of https://bugs.debian.org/814272
+   * Every arch failed on that day :(
+   */
+  if (iterate != 0 && y != (x > &y)) {
+    fprintf(stderr, "The stack changed its direction! (Iteration: %d. It was growing %s; &y=%p; &prevY=%p)\n",
+	    (10-iterate), y?"down":"up", &y, x);
     exit(1);
+  }
   return y;
 }
 
@@ -23,6 +31,6 @@ int main(int argc, char *argv[])
 {
   int x;
   printf("%s", growsdown(&x) ? "down" : "up");
-  exit(0);
-  return 1;
+
+  return 0;
 }