From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Tue, 18 Aug 2015 20:17:40 +0000 (-0500)
Subject: Provide a cached variable for the detection of FP exceptions.
X-Git-Tag: v8.4.0-rc2~587^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F965%2Fhead;p=dealii.git

Provide a cached variable for the detection of FP exceptions.

This way people can switch off the whole mechanism if the want.
---

diff --git a/cmake/checks/check_02_system_features.cmake b/cmake/checks/check_02_system_features.cmake
index 33aaccc9f0..7f481b7e45 100644
--- a/cmake/checks/check_02_system_features.cmake
+++ b/cmake/checks/check_02_system_features.cmake
@@ -95,11 +95,17 @@ CHECK_CXX_SOURCE_RUNS("
   " 
   _HAVE_FP_EXCEPTIONS)
 
-IF(_HAVE_FP_EXCEPTIONS)
-  MESSAGE(STATUS "Checking for Floating Point Exception macros -- Success")
-  SET(DEAL_II_HAVE_FP_EXCEPTIONS 1)
-ELSE()
-  MESSAGE(STATUS "Checking for Floating Point Exception macros -- Failed")
+
+SET(DEAL_II_HAVE_FP_EXCEPTIONS ON CACHE BOOL "If ON, floating point exception are raised in debug mode when running the testsuite.")
+
+IF (DEAL_II_HAVE_FP_EXCEPTIONS)
+  IF(_HAVE_FP_EXCEPTIONS)
+    MESSAGE(STATUS "Checking for Floating Point Exception macros -- Success")
+    # nothing to set here -- DEAL_II_HAVE_FP_EXCEPTIONS is already ON
+  ELSE()
+    MESSAGE(STATUS "Checking for Floating Point Exception macros -- Failed")
+    SET(DEAL_II_HAVE_FP_EXCEPTIONS OFF CACHE BOOL "" FORCE)
+  ENDIF()
 ENDIF()