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| author | Torvald Riegel <triegel@redhat.com> | 2014-10-18 01:02:59 +0200 |
|---|---|---|
| committer | Torvald Riegel <triegel@redhat.com> | 2014-11-20 11:57:38 +0100 |
| commit | 1ea339b69725cb2f30b5a84cb7ca96111c9a637b (patch) | |
| tree | 130609da9190b04afb366f3a506d3415ea2f982f /sysdeps/x86_64/bits | |
| parent | d960211ff52a6ab632eace2f905c4898f187df9e (diff) | |
| download | glibc-1ea339b69725cb2f30b5a84cb7ca96111c9a637b.tar.gz glibc-1ea339b69725cb2f30b5a84cb7ca96111c9a637b.tar.xz glibc-1ea339b69725cb2f30b5a84cb7ca96111c9a637b.zip | |
Add arch-specific configuration for C11 atomics support.
This sets __HAVE_64B_ATOMICS if provided. It also sets USE_ATOMIC_COMPILER_BUILTINS to true if the existing atomic ops use the __atomic* builtins (aarch64, mips partially) or if this has been tested (x86_64); otherwise, this is set to false so that C11 atomics will be based on the existing atomic operations.
Diffstat (limited to 'sysdeps/x86_64/bits')
| -rw-r--r-- | sysdeps/x86_64/bits/atomic.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sysdeps/x86_64/bits/atomic.h b/sysdeps/x86_64/bits/atomic.h index 4d19ef0bb4..99dfb50295 100644 --- a/sysdeps/x86_64/bits/atomic.h +++ b/sysdeps/x86_64/bits/atomic.h @@ -55,6 +55,12 @@ typedef uintmax_t uatomic_max_t; # endif #endif +#define __HAVE_64B_ATOMICS 1 +#if __GNUC_PREREQ (4, 7) +#define USE_ATOMIC_COMPILER_BUILTINS 1 +#else +#define USE_ATOMIC_COMPILER_BUILTINS 0 +#endif #define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ __sync_val_compare_and_swap (mem, oldval, newval) |