re-enable backtraces on linux.

CMakeLists.txt

@@ -13,9 +13,13 @@ include(MSVC)
 set (HAVE_STRDUP 0)
 set (HAVE_STRLCAT 0)
 set (HAVE_LIBBSD 0)
+set (HAVE_SIGNAL_H 0)
+set (HAVE_EXECINFO_H 0)
 else (MSVC)
 
 INCLUDE (CheckIncludeFile)
+CHECK_INCLUDE_FILE(signal.h HAVE_SIGNAL_H)
+CHECK_INCLUDE_FILE(execinfo.h HAVE_EXECINFO_H)
 CHECK_INCLUDE_FILE(bsd/string.h HAVE_LIBBSD)
 
 INCLUDE (CheckFunctionExists)

src/CMakeLists.txt

@@ -261,6 +261,10 @@ add_test(server test_eressea)
 
 install(TARGETS eressea DESTINATION "bin")
 
+if (HAVE_EXECINFO_H AND HAVE_SIGNAL_H)
+  add_definitions(-DHAVE_BACKTRACE)
+endif ()
+
 if (HAVE_LIBBSD)
   add_definitions(-DHAVE_LIBBSD)
 endif (HAVE_LIBBSD)

src/main.c

@@ -257,7 +257,7 @@ static int parse_args(int argc, char **argv)
     return 0;
 }
 
-#if defined(HAVE_SIGACTION) && defined(HAVE_EXECINFO)
+#if defined(HAVE_BACKTRACE)
 #include <execinfo.h>
 #include <signal.h>