I’m not sure what the correct warning is, but once you’ve found it, you can change its disposition with the following (using ‘format’ as the example): #pragma GCC diagnostic error “-Wformat” Or as strager points out: gcc -Werror=format … I’ve checked the gcc source for this and this specific warning cannot be disabled via command … Read more
I believe this could be the case here: in the first code, GCC notices that you don’t need the entire char array at all, just b[9], so it can replace the code with char b_9; // = ??? printf(“b[9] = %d\n”, b_9); Now, this is a completely legal transform, because as the array was accessed … Read more
Based on example from Jacksonville’18 ISO C++ Report the syntax is correct, but it seems that it is not implemented yet: if (a>b) [[likely]] { 10.6.6 Likelihood attributes [dcl.attr.likelihood] draft
Caolan Mc Namara, a LibreOffice developer, has made a small tool to detect this type of thing in LibreOffice source code. They had around thousands functions & methods unused in LibreOffice. His tool is a key element for removing them. It’s called callcatcher. It can collect functions/methods defined and subtract called/referenced It works directly on … Read more
-Wno-deprecated will remove all deprecated warnings
The warning was added in gcc7.1, see gcc7.1 release changes. From gcc docs: Level 1 of -Wformat-truncation […] warns only about calls to bounded functions whose return value is unused and that will most likely result in output truncation. The issue was a bug report and was closed as NOTABUG: Unhandled output truncation is typically … Read more
Add: #include <stdlib.h> to the top of your program.
A static function can be declared in a header file, but this would cause each source file that included the header file to have its own private copy of the function, which is probably not what was intended. Are u sure u haven’t included the abc.h file in any other .c files? Because declaring a … Read more
This particular issue is detected by cppcheck: $ cppcheck –enable=all this-minus-bool.cxx Checking this-minus-bool.cxx… [this-minus-bool.cxx:7]: (warning) Suspicious pointer subtraction. Did you intend to write ‘->’? (information) Cppcheck cannot find all the include files (use –check-config for details) This was with no include path given. If I add -I /usr/include/c++/4.8/, the issue is still detected: Checking this-minus-bool.cxx… … Read more
Let’s have a look at the generated assembly of your program: .LC0: .string “Hello World…” .LC1: .string “Successfully run without main…” nomain: push rbp mov rbp, rsp mov edi, OFFSET FLAT:.LC0 call puts mov edi, OFFSET FLAT:.LC1 call puts nop pop rbp ret Note the ret statement. Your program’s entry point is determined to be … Read more