gcc-warning

I'm finding __attribute__ ((warn_unused_result)) to be very useful as a means of encouraging developers not to ignore error codes returned by functions, but I need this to work with MSVC as well as gcc and gcc-compatible compilers such as ICC. Do the Microsoft Visual Studio C/C++ compilers have an equivalent mechanism ? (I've tried wading through MSDN without any luck so far.) It's _Check_return_ . See here for examples of similar annotations and here for function behaviour. It's supported since MSVC 2012. Example: _Check_return_ int my_return_must_be_checked() { return 42; } UPDATE FOR MSVC

I let gcc compile the following example using -Wall -pedantic : #include <stdio.h> int main(void) { printf("main: %p\n", main); /* line 5 */ printf("main: %p\n", (void*) main); /* line 6 */ return 0; } I get: main.c:5: warning: format ‘%p’ expects type ‘void *’, but argument 2 has type ‘int (*)()’ main.c:6: warning: ISO C forbids conversion of function pointer to object pointer type Line 5 made my change the code like in line 6. What am I missing to remove the warning when printing a function's address? R.. This is essentially the only portable way to print a function pointer. size_t i; int (

I'd like to find unused functions in a codebase - including across compilations units. I'm using gcc as my compiler. Here's an example: foo.c (assume appropriate foo.h ): void foo() { .... } void bar() { .... } main.c : #include <stdio.h> #include "foo.h" int main(void) { bar(); return 0; } In this example, I'd like to get warned about foo() not being used. There is the -Wunused-function gcc option: -Wunused-function Warn whenever a static function is declared but not defined or a non-inline static function is unused. This warning is enabled by -Wall. but it's only for static functions - it