Pragma disabling warning 4668 are not honored in time by the MSVC pre-processor

c4668-preprocessor-script.bat

@echo off
REM a normal compilation runs through
cl.exe main.cpp /Z7 /nologo /c -DWIN32 -W4 -WX -Wall -wd4514

REM however the pre-processor fails because of -WX and C4668
cl.exe main.cpp /Z7 /nologo /c -DWIN32 -W4 -WX -Wall -wd4514 -E

test-warning-c4668.cpp

#if defined(_MSC_VER)
#define PUSH_LENIENT_WARNINGS \
    __pragma(warning(push)) \
    __pragma(warning(disable: 4668)) \
    __pragma(warning(disable: 4100))
    
#define POP_LENIENT_WARNINGS \
    __pragma(warning(pop))
#endif
    
// # A section of code where warnings are relaxed.
// This would for instance be a third-party library header file, for instance
PUSH_LENIENT_WARNINGS
#if SOME_RARE_DEFINE_TRIGGERING_C4668
#error "HELLO"
#endif

inline int function_triggering_unused_args_warning(int a) {
  return 42;
}
POP_LENIENT_WARNINGS
// End of section

// # Now regular part of the code where warnings should apply in full:
extern "C" int puts(const char*);
extern "C" int exit(int);

#define UNUSED(__symbol) (void)(__symbol)

int main(int argc, char **argv)
{
    UNUSED(argc);
    UNUSED(argv);
    puts("hello, world");
#if WIN32
    #if defined(SOME_RARE_DEFINE_TRIGGERING_C4668)
    #endif
    puts("On win32");
#endif
    exit(0);
}