AM3358: Find reason for a warning within a macro

user6544278

Part Number: AM3358

I'm building my AM3358-stuff with the TI ARM compiler. At some point in code I get a

warning #193-D: type qualifier is meaningless on cast type

The position in code that causes this warning is a macro

COMMON_MTYPE_CASES

Unfortunately this macro is quite big, so there is no obvious reason for this warning.

My question: is there a possibility to let the compiler be more specific regarding the exact position of the reason for this warning? I already enabled the option --gen_preprocessor_listing to let the compiler generate .rl-files which contain the whole, preprocessed code (so that COMMON_MTYPE_CASES is recolved), but that does not help very much, the compiler / compiler output still uses the code line out of the .c-file, not out of the -rl-file for issuing the warning.

Thanks!

over 4 years ago

+1 George Mock over 4 years ago

TI__Guru**** 249760 points

Here is a method to consider. It uses a combination of verbose diagnostics and preprocessing. It is demonstrated on a contrived example.

These two commands show the source file, and an initial build of it.

C:\working_directory>type file.c
/* Illegal operator in C */
#define MACRO 10 ** 5
int var = MACRO;

C:\working_directory>armcl file.c
"file.c", line 3: error: operand of "*" must be a pointer

Whenever a diagnostic is confusing, use the option --verbose_diagnostics to see more about it ...

C:\working_directory>armcl --verbose_diagnostics file.c
"file.c", line 3: error: operand of "*" must be a pointer
  int var = MACRO;
            ^

In this particular case, it does not help.

Next preprocess the file. Use the option --preproc_with_comment.

C:\working_directory>armcl --preproc_with_comment file.c

The preprocessed file has the same name as the source file, with the file extension changed to .pp.

C:\working_directory>type file.pp
/* Illegal operator in C */
int var = 10 * * 5;

Next, build the preprocessed file with --verbose_diagnostics ...

C:\working_directory>armcl --verbose_diagnostics file.pp
"file.pp", line 2: error: operand of "*" must be a pointer
  int var = 10 * * 5;
                   ^

That usually makes the problem easy to understand.

For more details on the compiler options used, please search for them in the TI ARM compiler manual.

Thanks and regards,

-George

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AM3358: Find reason for a warning within a macro