Use _Pragma to replace #pragma, so that to resolve two pragmas in a single macro。

pragma.m

#define LEAK_PRAGMA_BEGIN \
    _Pragma("clang diagnostic push") \
    _Pragma("clang diagnostic warning \"-Warc-performSelector-leaks\"")

#define LEAK_PRAGMA_END \
    _Pragma("clang diagnostic pop") 

@interface AClass : NSObject
- (void)doSomething;
@end
@implementation AClass
- (void)doSomething
{
    NSLog(@"Do something!");
}
@end
    
int main(int argc, char const *argv[]) 
{
    LEAK_PRAGMA_BEGIN
    [[AClass new] performSelector:@selector(doSomething)];
    LEAK_PRAGMA_BEGIN
    return 0;
}

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