compilation error (-std=gnu++14 ) : altivec types aliases with 'using' keyword and macros preprocessor in the same file

[quickwritereader]

#include <altivec.h>
using vdbl =  __vector double;

#define BREAK 1

workaround 0: -std=c++14 workaround 1: typedef __vector double vdbl; workaround 2: using vdbl = __attribute__((altivec(vector__))) double; workaround 3: putting dummy function between void dummy(){};

[quickwritereader]

https://godbolt.org/z/o6eoo4

[Flamefire]

This is intresting indeed. I also found there is some dependency on maltivec vs mvsx and ppc vs ppcle: https://godbolt.org/z/4bGsh8 It seems to swallow what comes after __vector

[mscastanho]

I was able to reproduce it on AT 14:

$ cat /tmp/test-vector.c 
#include <altivec.h>
using vdbl =  __vector double;
#define BREAK 1
$ /opt/at14.0/bin/g++ -c /tmp/test-vector.c 
/tmp/test-vector.c:4:15: error: expected type-specifier before numeric constant
    4 | #define BREAK 1
      |               ^
/tmp/test-vector.c:4:9: note: in expansion of macro ‘BREAK’
    4 | #define BREAK 1
      |         ^~~~~
$ /opt/at14.0/bin/g++ -c /tmp/test-vector.c -std=c++14
$

[mscastanho]

@quickwritereader This looks like a general GCC bug, not limited to AT. Could you open a bug report upstream (gcc.gnu.org/bugzilla), please? Thanks!

[tuliom]

AFAICS, this issue is still broken on AT 14. I'm reopening this issue so that we can use it to track the fix downstream.

[tuliom]

I didn't find a bug report upstream for this issue, so I reported it: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101168