Hello, I'm using KEIL V5.10 with STM32F103. My project has some enum type variables, such as typedef enum { a0 = 0, a1, a2, an } aType;
In source file, I used conditional compile statements:
#if (an > 0) xxxx #endif
But the body inside was not compiled whatever an is higher than zero, I don't know why.
An array can be correctly complied if I used an as array's length, such as
static uint16_t u16Buf[an];
There is no warning or error after compilation.
Anyone knows why the conditional compilation does not work?
Thanks!
because gcc does not support enum type in conditional compilation directives.
but obviously KEIL (gcc) does not support it.
As I said before:
That won't work with any c compiler.
If you find a compiler that does do it, then the best thing to do is discard it; because it wouldn't be compliant with the standards.