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| author | Jonathan Wakely <jwakely@redhat.com> | 2022-02-08 13:41:33 +0000 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2022-02-08 14:15:38 +0000 |
| commit | 8dbb60b8dfc642a81f1c41fde11767150e8f91a5 (patch) | |
| tree | 3604e58b5fe004d3fc73fa4fa5aa494eac6c2b63 /libstdc++-v3/acinclude.m4 | |
| parent | 676e987b850a7352ece750a8f3a1ac5dae6b3627 (diff) | |
| download | gcc-8dbb60b8dfc642a81f1c41fde11767150e8f91a5.zip gcc-8dbb60b8dfc642a81f1c41fde11767150e8f91a5.tar.gz gcc-8dbb60b8dfc642a81f1c41fde11767150e8f91a5.tar.bz2 | |
libstdc++: Add comment to acinclude.m4
libstdc++-v3/ChangeLog:
* acinclude.m4 (GLIBCXX_ENABLE_LOCK_POLICY): Add comment about
checking for CAS on correct word size.
Diffstat (limited to 'libstdc++-v3/acinclude.m4')
| -rw-r--r-- | libstdc++-v3/acinclude.m4 | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4 index 7cc52f4..f53461c 100644 --- a/libstdc++-v3/acinclude.m4 +++ b/libstdc++-v3/acinclude.m4 @@ -3609,6 +3609,8 @@ AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [ ac_save_CXXFLAGS="$CXXFLAGS" dnl Why do we care about 2-byte CAS on targets with 4-byte _Atomic_word?! + dnl Why don't we check 8-byte CAS for sparc64, where _Atomic_word is long?! + dnl New targets should only check for CAS for the _Atomic_word type. AC_TRY_COMPILE([ #if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 # error "No 2-byte compare-and-swap" |