Re: [RFC] Ignore source code comments in scripts/check-installed-headers.sh

[Szabolcs Nagy <Szabolcs.Nagy@arm.com>]

On 17/01/2019 00:14, Tulio Magno Quites Machado Filho wrote:
> DJ Delorie <dj@redhat.com> writes:
> 
>> I just tested this (gcc 4 and 7), and the #define didn't survive the
>> trip...
>>
>> $ cat foo.c
>> #define ulong unsigned long
>>
>> ulong x;  /* don't use ulong */
>>
>> $ gcc -E -fpreprocessed foo.c
>> # 3 "foo.c"
>> ulong x;
> 
> Yep.  You're right.
> We're back to the regex.  :-D

-Dd works for me:

$ cat foo.c
#define ulong unsigned long

ulong x; /* don't use ulong */

$ gcc -E -dD foo.c
# 1 "foo.c"
# 1 "<built-in>"
... gcc predefined macros ...
# 1 "<command-line>"
# 31 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 19 "/usr/include/stdc-predef.h" 3 4
#define _STDC_PREDEF_H 1
# 38 "/usr/include/stdc-predef.h" 3 4
#define __STDC_IEC_559__ 1







#define __STDC_IEC_559_COMPLEX__ 1
# 58 "/usr/include/stdc-predef.h" 3 4
#define __STDC_ISO_10646__ 201706L


#define __STDC_NO_THREADS__ 1
# 32 "<command-line>" 2
# 1 "foo.c"
#define ulong unsigned long

unsigned long x;