Кроме того, для Borland Builder была добавлена опция --fast-call — передача параметров через регистры (Intel Compiler, MSVC++ и gcc автоматически используют передачу параметров через регистры при использовании оптимизации по скорости

#define for if(0);else for

void foo()
{
  char *val = __FUNC__;
  for(int i = 0; *val; i++)
  {
     *val ^= i; 
  }
  for(int i = 0; *val; i++)
  {
     *val ^= i; 
  }
}

C++ Standard Noncompliance Issues with Visual C++ 6.0
ID: Q243451
...
Scope of variable declared in the for loop initialization (6.5.3) not as per standard.
Q167748 PRB: Variable Scope in for-statement Extends Beyond Loop...

SYMPTOMS
If you declare the same variable in two different for-statements, the following error may appear:

Test.cpp(4) : error C2374: 'i' : redefinition; multiple initialization

CAUSE
The scope of a variable declared in the initialization part of a "for" loop is given local scope, as if it had been declared immediately prior to the for-statement

Beginning with Visual C++ 6.0, when statically linking with a DLL, the linker provides options to delay load the DLL until the program calls a function in that DLL.

#include <iostream>

template<int i> void f() { std::cout << i << std::endl; }

int main( int argc, char* argv[] )
{
  f<1>();
  f<2>();
  return 0;
}

2
2

1
2

C>1
C>2
C>

2
2