App: add a CMake test to check if C runtime provides backtrace symbols

cMake/ConfigureChecks.cmake

@@ -63,3 +63,23 @@ SET(HAVE_QT_KEYPAD_DEFINE 1)
 SET(HAVE_QWIDGET_SHOWFULLSCREEN 1)
 
 
+file(WRITE ${CMAKE_BINARY_DIR}/backtrace.cpp
+         "#include <cstddef>\n"
+         "#include <execinfo.h>\n\n"
+         "int main() {\n"
+         "    void *callstack[128];\n"
+         "    size_t nMaxFrames = sizeof(callstack) / sizeof(callstack[0]);\n"
+         "    size_t nFrames = backtrace(callstack, nMaxFrames);\n"
+         "    char **symbols = backtrace_symbols(callstack, nFrames);\n"
+         "    return 0;\n"
+         "}"
+)
+
+try_compile(
+  RESULT_VAR
+    ${CMAKE_BINARY_DIR}
+  SOURCES
+    ${CMAKE_BINARY_DIR}/backtrace.cpp
+)
+
+SET(HAVE_BACKTRACE_SYMBOLS ${RESULT_VAR})

config.h.cmake

@@ -114,6 +114,9 @@
 /* Define to 1 if you have the <values.h> header file. */
 #cmakedefine HAVE_VALUES_H
 
+/* Define to 1 if you have a C runtime with backtrace symbols. */
+#cmakedefine HAVE_BACKTRACE_SYMBOLS
+
 /* Name of package */
 #define PACKAGE "FreeCAD"
 

src/App/Application.cpp

@@ -1679,9 +1679,14 @@ static void freecadNewHandler ()
 #include <string>
 #include <sstream>
 
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif // HAVE_CONFIG_H
+
 // This function produces a stack backtrace with demangled function & method names.
 void printBacktrace(size_t skip=0)
 {
+#if defined HAVE_BACKTRACE_SYMBOLS
     void *callstack[128];
     size_t nMaxFrames = sizeof(callstack) / sizeof(callstack[0]);
     size_t nFrames = backtrace(callstack, nMaxFrames);
@@ -1712,6 +1717,10 @@ void printBacktrace(size_t skip=0)
     }
 
     free(symbols);
+#else //HAVE_BACKTRACE_SYMBOLS
+    (void)skip;
+    std::cerr << "Cannot print the stacktrace because the C runtime library doesn't provide backtrace or backtrace_symbols\n";
+#endif
 }
 #endif