use CMake check_function_exists() for execinfo

Signed-off-by: Uli Schlachter <psychon@znc.in>

awesomeConfig.cmake

@@ -162,11 +162,10 @@ endmacro()
 
 # Check for libev
 a_find_library(LIB_EV ev)
-# GNU libc has <execinfo.h> and backtrace() stuff. If this is not available, we
+
-# need libexecinfo.
+# Check for backtrace_symbols()
-try_compile(HAS_EXECINFO
+include(CheckFunctionExists)
-    ${CMAKE_BINARY_DIR}
+check_function_exists(backtrace_symbols HAS_EXECINFO)
-    ${CMAKE_SOURCE_DIR}/build-tests/execinfo.c)
 if(NOT HAS_EXECINFO)
     find_library(LIB_EXECINFO execinfo)
     if(LIB_EXECINFO)

build-tests/execinfo.c

@@ -1,42 +0,0 @@
-/*
- * build-tests/execinfo.c
- * stolen from http://www.gnu.org/s/libc/manual/html_node/Backtraces.html
- */
-#include <execinfo.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-/* Obtain a backtrace and print it to stdout. */
-void
-print_trace (void)
-{
-  void *array[10];
-  size_t size;
-  char **strings;
-  size_t i;
-
-  size = backtrace (array, 10);
-  strings = backtrace_symbols (array, size);
-
-  printf ("Obtained %zd stack frames.\n", size);
-
-  for (i = 0; i < size; i++)
-     printf ("%s\n", strings[i]);
-
-  free (strings);
-}
-
-/* A dummy function to make the backtrace more interesting. */
-void
-dummy_function (void)
-{
-  print_trace ();
-}
-
-int
-main (void)
-{
-  dummy_function ();
-  return 0;
-}
-