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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.
This commit is contained in:
Jonathan Wakely 2022-02-08 13:41:33 +00:00
parent 676e987b85
commit 8dbb60b8df
1 changed files with 2 additions and 0 deletions
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libstdc++-v3/acinclude.m4
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@ -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"