QTBUG-4852 Turning on runtime nested exception support where available

Added nested_exceptions.prf to the symbian mkspecs features, and used
it from the stl.prf config.

nested_exceptions.prf adds the .mmp flag to use the nested exceptions
runtime support library for apps.

stl.prf will add nested_exceptions to the config when the support
library is present. Since this check depends on the existence of the
runtime support library when qmake is run, qtp will have to add
nested_exceptions to their config when building with nested exception
support.

This change means that, where nested exceptions are supported on
Symbian, apps will no longer crash if a nested exception is encountered
at runtime.

Task-number: QTBUG-4852
Reviewed-by: Miikka Heikkinen

2 files changed, 9 insertions, 0 deletions

diff --git a/mkspecs/features/symbian/nested_exceptions.prf b/mkspecs/features/symbian/nested_exceptions.prf
new file mode 100644
index 0000000..defca94
--- /dev/null
+++ b/mkspecs/features/symbian/nested_exceptions.prf
@@ -0,0 +1,4 @@
+# use nested exceptions runtime support for apps
+contains(TEMPLATE, app) {
+    MMP_RULES *= EPOCNESTEDEXCEPTIONS
+}
diff --git a/mkspecs/features/symbian/stl.prf b/mkspecs/features/symbian/stl.prf
index 2a3bce4..65d4b93 100644
--- a/mkspecs/features/symbian/stl.prf
+++ b/mkspecs/features/symbian/stl.prf
@@ -36,3 +36,8 @@ equals(use_libstdcppv5, true) {
 } else {
     LIBS *= -llibstdcpp.dll
 }
+
+# use the runtime support for nested exceptions, if a library is available
+exists($${EPOCROOT}epoc32/release/armv5/urel/usrt_nx_*.lib) {
+    CONFIG += nested_exceptions
+}