DeviceSpec:parser: improve exception messages

hcore/deviceManager/deviceSpecParser.cpp

@@ -14,7 +14,9 @@ std::string DeviceManager::readDeviceFile(const std::string& filename)
 {
     std::ifstream file(filename);
     if (!file.is_open()) {
-        throw std::runtime_error("Could not open file: " + filename);
+        throw std::runtime_error(
+            std::string(__func__) + ": Couldn't open deviceSpec file: "
+            + filename);
     }
 
     std::string content(
@@ -46,11 +48,15 @@ void DeviceManager::parseAllDeviceSpecs(void)
         &fclose);
 
     if (!input) {
-        throw std::runtime_error("Failed to open memory as file");
+        throw std::runtime_error(
+            std::string(__func__) + ": Failed to fmemopen() a FILE* for "
+            "parsing device specs");
     }
 
     deviceSpeclin = input.get();
     if (deviceSpecpparse()) {
-        throw std::runtime_error("Failed to parse device specs");
+        throw std::runtime_error(
+            std::string(__func__) + ": Failed to parse device specs. "
+            "Check specs for errors");
     }
 }