Changes between Version 25 and Version 26 of Guidelines/WarningsGuidelines

Timestamp:

Dec 4, 2012, 3:24:34 PM (10 years ago)

Author:

Paul A. Bristow

Comment:

Added some info on Clang compiler - more needed

Guidelines/WarningsGuidelines

@@ -855 +855 @@
 
 ----
+
+'''Clang'''
+
+Clang supports most GCC warnings, see [http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html]
+
+[http://clang.llvm.org/docs/UsersManual.html#cl_diagnostics]
+
+Clang also supports suppressing warnings by pragmas, see [http://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html]
+for example
+
+{{{#pragma clang diagnostic ignored "-Wno-unused-variable"}}}
+
+As with MSVC, it is usually desirable to localize warning suppression by bracketing push'n'pop pragmas.
+Localization is especially important in included .hpp library files to avoid quietly suppressing warnings in user code:
+the user may need to see warnings in his code.  A contrived example is:
+
+{{{
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wmultichar"
+
+char b = 'df'; // No warning.
+
+#pragma clang diagnostic pop
+}}}
+
+More info needed on Clang.
+
 '''Intel'''