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| author | Brad King <brad.king@kitware.com> | 2020-04-07 07:39:38 -0400 |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2020-04-07 07:47:47 -0400 |
| commit | 02a28f1d4451839abfc38e0c437cda438811172f (patch) | |
| tree | 4ea836a692d0ea9f4a0d1f9d3978234fd4f3b09b /Utilities/cmlibuv | |
| parent | 82a06d5cb46bea0e87fdeed35ab023099f649621 (diff) | |
| download | cmake-02a28f1d4451839abfc38e0c437cda438811172f.tar.gz | |
libuv: Restore compilation with XLClang 16.1 on AIX
libuv upstream commit `4a972bf0` (aix: Fix broken cmpxchgi() XL C++
specialization., 2019-09-06, v1.32.0~5) broke compilation with this
compiler. According to
https://www.ibm.com/support/knowledgecenter/SSGH3R_16.1.0/com.ibm.xlcpp161.aix.doc/migrate/migrate_to_xlclang.html
XLClang 16.1 for AIX does not support `__sync_val_compare_and_swap`.
The documentation suggests using C++11 atomic operations instead, but
this is C code. For now fall back to the non-atomic equivalent used
before so we can at least compile. Add a FIXME comment for this.
Diffstat (limited to 'Utilities/cmlibuv')
| -rw-r--r-- | Utilities/cmlibuv/src/unix/atomic-ops.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Utilities/cmlibuv/src/unix/atomic-ops.h b/Utilities/cmlibuv/src/unix/atomic-ops.h index bc37c0d45d..7efed023c8 100644 --- a/Utilities/cmlibuv/src/unix/atomic-ops.h +++ b/Utilities/cmlibuv/src/unix/atomic-ops.h @@ -36,6 +36,12 @@ UV_UNUSED(static int cmpxchgi(int* ptr, int oldval, int newval)) { : "r" (newval), "0" (oldval) : "memory"); return out; +#elif defined(_AIX) && defined(__ibmxl__) + /* FIXME: This is not actually atomic but XLClang 16.1 for AIX + does not provide __sync_val_compare_and_swap or an equivalent. + Its documentation suggests using C++11 atomics but this is C. */ + __compare_and_swap((volatile int*)ptr, &oldval, newval); + return oldval; #elif defined(__MVS__) unsigned int op4; if (__plo_CSST(ptr, (unsigned int*) &oldval, newval, |