When setting the option ALIAS_STANDARD_FUNCTION_NAMES to ON only the definitions inside printf.c will be affected. Inside printf.c https://github.com/eyalroz/printf/blob/develop/src/printf/printf.c#L54:

#if PRINTF_ALIAS_STANDARD_FUNCTION_NAMES
# define printf_    printf
# define sprintf_   sprintf
# define vsprintf_  vsprintf
# define snprintf_  snprintf
# define vsnprintf_ vsnprintf
# define vprintf_   vprintf
#endif

But in the printf.h there is no include "printf_config.h", thus the declarations will never be aliased.

It means that, if the option is set to ON and the library is compiled, installed and consumed:

#include "printf.h"

int main()
{
    char c[64]; 
    snprintf(c, sizeof(c), "%d %f", 5, 160.1);

    return 0;
}

One gets compilation error:

main.cpp: In function ‘int main()’:
main.cpp:6:12: error: ‘snprintf’ was not declared in this scope
6 | snprintf(c, sizeof(c), "%d %f", 5, 160.1);
| ^~~~~~~~

Possible solutions:

1. Install printf_config.h along with printf.h and put #include "printf.h" at the top of printf.h.
2. Generate printf.h and rename the function names basing on the ALIAS_STANDARD_FUNCTION_NAMES option value.
3. Generate printf.h by putting PRINTF_ALIAS_STANDARD_FUNCTION_NAMES macro dynamically at the top of the printf.h file during installation and use target_compile_definitions(printf PUBLIC PRINTF_ALIAS_STANDARD_FUNCTION_NAMES) for the build interface.
4. Other?