[OpenMP] Fix KMP_OS_AIX handling #138499
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[OpenMP] Fix KMP_OS_AIX handling #138499
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When building `openmp` on Linux/sparc64, I get
```
In file included fromopenmp/runtime/src/kmp_utility.cpp:16:
openmp/runtime/src/kmp_wrapper_getpid.h:47:2: warning: No gettid found, use getpid instead [-W#warnings]
47 | #warning No gettid found, use getpid instead
| ^
```
This is highly confusing since `<sys/syscall.h>` **does** define
`SYS_gettid` and the header is supposed to be included:
```
#if !defined(KMP_OS_AIX) && !defined(KMP_OS_HAIKU)
#include <sys/syscall.h>
#endif
```
However, this actually is **not** the case for two reasons:
- `KMP_OS_HAIKU` is always defined, either as 1 on Haiku or as 0 otherwise.
- `KMP_OS_AIX` is even worse: it is only defined as 1 on on AIX, but
undefined otherwise.
All those `KMP_OS_*` macros are supposed to always be defined as 1/0 as
appropriate, and to be checked with `#if`, not `#ifdef`. AIX is violating
this, causing the problem above.
Other targets probably get `<sys/syscall.h>` indirectly otherwise, but
Linux/sparc64 does not.
This patch fixes this by also defining `KMP_OS_AIX` as 0 on other OSes and
changing the checks to `#if` as necessary.
Tested on `sparc64-unknown-linux-gnu`, `sparcv9-sun-solaris2.11`,
`amd64-pc-solaris2.11`, and `x86_64-pc-linux-gnu`.
xingxue-ibm
approved these changes
May 5, 2025
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xingxue-ibm
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Tested on AIX. Thanks so much for the fix, @rorth!
GeorgeARM
pushed a commit
to GeorgeARM/llvm-project
that referenced
this pull request
May 7, 2025
When building `openmp` on Linux/sparc64, I get
```
In file included fromopenmp/runtime/src/kmp_utility.cpp:16:
openmp/runtime/src/kmp_wrapper_getpid.h:47:2: warning: No gettid found, use getpid instead [-W#warnings]
47 | #warning No gettid found, use getpid instead
| ^
```
This is highly confusing since `<sys/syscall.h>` **does** define
`SYS_gettid` and the header is supposed to be included:
```
#if !defined(KMP_OS_AIX) && !defined(KMP_OS_HAIKU)
#include <sys/syscall.h>
#endif
```
However, this actually is **not** the case for two reasons:
- `KMP_OS_HAIKU` is always defined, either as 1 on Haiku or as 0
otherwise.
- `KMP_OS_AIX` is even worse: it is only defined as 1 on on AIX, but
undefined otherwise.
All those `KMP_OS_*` macros are supposed to always be defined as 1/0 as
appropriate, and to be checked with `#if`, not `#ifdef`. AIX is
violating this, causing the problem above.
Other targets probably get `<sys/syscall.h>` indirectly otherwise, but
Linux/sparc64 does not.
This patch fixes this by also defining `KMP_OS_AIX` as 0 on other OSes
and changing the checks to `#if` as necessary.
Tested on `sparc64-unknown-linux-gnu`, `sparcv9-sun-solaris2.11`,
`amd64-pc-solaris2.11`, and `x86_64-pc-linux-gnu`.
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When building
openmpon Linux/sparc64, I getThis is highly confusing since
<sys/syscall.h>does defineSYS_gettidand the header is supposed to be included:However, this actually is not the case for two reasons:
KMP_OS_HAIKUis always defined, either as 1 on Haiku or as 0 otherwise.KMP_OS_AIXis even worse: it is only defined as 1 on on AIX, but undefined otherwise.All those
KMP_OS_*macros are supposed to always be defined as 1/0 as appropriate, and to be checked with#if, not#ifdef. AIX is violating this, causing the problem above.Other targets probably get
<sys/syscall.h>indirectly otherwise, but Linux/sparc64 does not.This patch fixes this by also defining
KMP_OS_AIXas 0 on other OSes and changing the checks to#ifas necessary.Tested on
sparc64-unknown-linux-gnu,sparcv9-sun-solaris2.11,amd64-pc-solaris2.11, andx86_64-pc-linux-gnu.