Enable FPE tracking

configure.ac

@@ -315,6 +315,18 @@ AC_ARG_ENABLE([hpc],
 AS_IF([test "x$enable_hpc" = "xyes"],
       [AC_DEFINE([HAVE_HPC], [1], [Activate HPC routines])])
 
+
+AC_ARG_ENABLE([fpe],
+              [AS_HELP_STRING([--enable-fpe],
+                              [Enable floating-point exceptions])],
+              [enable_fpe=$enableval],
+              [enable_fpe=no])
+
+AS_IF([test "x$enable_fpe" = "xyes"],
+      [AC_DEFINE([HAVE_FPE], [1], [Activate floating-point exceptions])])
+
+
+
 AC_ARG_ENABLE([doc],
             [AS_HELP_STRING([--disable-doc],
                             [Disable documentation])],

org/qmckl_numprec.org

@@ -40,6 +40,42 @@ int main() {
 #include <stdlib.h>
 #include <string.h>
 
+#ifdef HAVE_FPE
+#define _GNU_SOURCE
+#include <fenv.h>
+#include <signal.h>
+#include <stdio.h>
+#include <execinfo.h>
+
+
+#define MAX_BACKTRACE_SIZE 100
+
+void floatingPointExceptionHandler(int signal) {
+    void* backtraceArray[MAX_BACKTRACE_SIZE];
+    int backtraceSize = backtrace(backtraceArray, MAX_BACKTRACE_SIZE);
+    char** backtraceSymbols = backtrace_symbols(backtraceArray, backtraceSize);
+
+    // Print the backtrace
+    for (int i = 0; i < backtraceSize; ++i) {
+            printf("[%d] %s\n", i, backtraceSymbols[i]);
+    }
+
+    // Clean up the memory used by backtrace_symbols
+    free(backtraceSymbols);
+
+    exit(EXIT_FAILURE);
+}
+
+static void __attribute__ ((constructor))
+trapfpe ()
+{
+  /* Enable some exceptions.  At startup all exceptions are masked.  */
+
+  feenableexcept (FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW);
+  signal(SIGFPE, floatingPointExceptionHandler);
+}
+#endif
+
 #include "qmckl.h"
 #include "qmckl_context_private_type.h"
   #+end_src