warning: declaration does not declare anything

lpcware — Thu, 16 Jun 2016 01:45:54 GMT

Content originally posted in LPCWare by graynomad on Fri Jul 20 20:14:38 MST 2012
Man I hate tool-chain errors, give me an honest code bug any day.

I've been writing a stack of code for a week or so now and it's be going just fine. This morning I thought it's time to turn it into a library to clean things up so I created a new project, sucked all the files into it and tried to build.

Now I get a dozen or so warnings in LPC122x.h when building the CMSISv2p00_LPC12xx project

Quote:
warning: declaration does not declare anything

It's referring to any use of unions inside the structs that define peripherals, eg

typedef struct {                            /*!< (@ 0x4000C000) UART1 Structure        */
  
  union {
    __IO uint32_t DLL;                      /*!< (@ 0x4000C000) Divisor Latch LSB. Least significant byte of the baud rate divisor value. The full divisor is used to generate a baud rate from the fractional rate divider. */
    __IO uint32_t THR;                      /*!< (@ 0x4000C000) Transmit Holding Register. The next character to be transmitted is written here. */
    __I  uint32_t RBR;                      /*!< (@ 0x4000C000) Receiver Buffer Register. Contains the next received character to be read. */
  };
   ...
} LPC_UART1_Type;

So things like TDR don't get defined and of course further down in my project I get

Quote:
has no member named 'THR'

style errors.

I thought it may be the C variant but I'm using C99 as I always have and I can see no obvious option that would do this. I cleaned both projects in case there was a dodgy .a file somewhere, no difference.

Any ideas?

Re: warning: declaration does not declare anything

lpcware — Thu, 16 Jun 2016 01:45:55 GMT

Content originally posted in LPCWare by graynomad on Sat Jul 21 02:34:58 MST 2012
OK, stop looking I think I found it. Despite having done this before it seems that selecting gnu99 fixes the problem.

Change back to c99...problem back.

And yet I've been using c99 up till now.

LPCXpresso IDE中的主题 warning: declaration does not declare anything

warning: declaration does not declare anything

Re: warning: declaration does not declare anything