I cannot make the method to temporarily disable warnings in GCC (see How to disable GCC warnings for a few lines of code) work, at least not for the "unknown-pragmas" warning.
Compiling this code ...
#pragma comment(user,"This should depend on the command line options") #pragma GCC diagnostic warning "-Wunknown-pragmas" #pragma comment(user,"This should cause a warning") #pragma GCC diagnostic error "-Wunknown-pragmas" #pragma comment(user,"This should cause an error") #pragma GCC diagnostic ignored "-Wunknown-pragmas" #pragma comment(user,"This should be ignored") ... produces either no warning/error (except that the linker complais about a missing main), or when using -Wall or just -Wunknown-pragmas it produces one warning for each of the comment pragmas.
The behaviour that I would have expected is that each comment should have caused exactly what the comment says.
I think I can back my expectation with the documentation:
At the moment only warnings (normally controlled by ‘-W...’) can be controlled, and not all of them. Use
-fdiagnostics-show-optionto determine which diagnostics are controllable and which option controls them.
The warnings I get show as
warning: ignoring #pragma comment [-Wunknown-pragmas] and as the part in brackets tells us,
- this diagnostic is controllable
- and the option
-Wunknown-pragmascontrols it
Hence my code should work.
So what am I doing wrong?
version info:
$ gcc --version gcc (Ubuntu 5.4.0-6ubuntu1~16.04.11) 5.4.0 20160609 
