Originally posted by: Teej42

Is there any reason why we can't upgrade AIX 7.1 to GCC 8.1 instead of 6.3 as provided on the site?  We are trying to make OpenBLAS (https://github.com/xianyi/OpenBLAS) and it complains that id64_t is not a valid data type:

$ /opt/freeware/bin/make TARGET=POWER BINARY=64 CC=gcc FC=gfortran
In file included from cpuid_power.c:41:0,
                 from getarch.c:1051:
/usr/include/sys/vminfo.h:743:2: error: unknown type name 'id64_t'
  id64_t    id; /* pid or tid */
  ^~~~~~
make: *** [Makefile.prebuild:62: getarch] Error 1
Makefile.system:1047: Makefile.: No such file or directory
make: *** No rule to make target 'Makefile.'.  Stop.

Comments on prior successful use of OpenBLAS points to the use of GCC 4.8.1+ on AIX, but that is only available on AIX 7.2.  I am still investigating on when id64_t data type is added to GCC.  Any particular reason why GCC 4.8.1+ can't be back ported to AIX 7.1?

Originally posted by: AyappanP

I guess you got confused with version numbers. AIX 7.1 has gcc 6.3.0 which is greater than 4.8.1 

From this error, i would say this doesn't seems to do anything with GCC.

I suggest you to add "-maix64" in the CFLAGS  and try again.

Originally posted by: Teej42

The workaround is to add the following line to /usr/include/sys/vminfo.h:

/* TJG - Added 4 Oct 2018 */
typedef long id64_t;

Wish I didn't have to do this, but I can't identify the actual source of this typedef, and why it didn't work within the included sys/types.h:

/* Generic size invariant ID */
#ifdef  __64BIT__
typedef long            id64_t;
#elif defined(_LONG_LONG)
typedef long long       id64_t;
#else /* _ALL_SOURCE */
typedef quad            id64_t;
#endif

Ah well, onward.