From 988989e49ef8639123c83383ba256c4e67679c8d Mon Sep 17 00:00:00 2001 From: Rainer Gerhards Date: Thu, 18 Sep 2008 10:49:16 +0200 Subject: re-enabled gcc builtin atomic operations and added a proper ./configure check --- configure.ac | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) (limited to 'configure.ac') diff --git a/configure.ac b/configure.ac index 8e9f7807..fea7c063 100644 --- a/configure.ac +++ b/configure.ac @@ -107,6 +107,56 @@ AC_TRY_COMPILE([ AC_MSG_RESULT(no; defined as 64) ) +# check for availability of atomic operations +# rgerhards, 2008-09-18, added based on +# http://svn.apache.org/repos/asf/apr/apr/trunk/configure.in + +AC_CACHE_CHECK([whether the compiler provides atomic builtins], [ap_cv_atomic_builtins], +[AC_TRY_RUN([ +int main() +{ + unsigned long val = 1010, tmp, *mem = &val; + + if (__sync_fetch_and_add(&val, 1010) != 1010 || val != 2020) + return 1; + + tmp = val; + + if (__sync_fetch_and_sub(mem, 1010) != tmp || val != 1010) + return 1; + + if (__sync_sub_and_fetch(&val, 1010) != 0 || val != 0) + return 1; + + tmp = 3030; + + if (__sync_val_compare_and_swap(mem, 0, tmp) != 0 || val != tmp) + return 1; + + if (__sync_lock_test_and_set(&val, 4040) != 3030) + return 1; + + mem = &tmp; + + if (__sync_val_compare_and_swap(&mem, &tmp, &val) != &tmp) + return 1; + + __sync_synchronize(); + + if (mem != &val) + return 1; + + return 0; +}], [ap_cv_atomic_builtins=yes], [ap_cv_atomic_builtins=no], [ap_cv_atomic_builtins=no])]) + +if test "$ap_cv_atomic_builtins" = "yes"; then + AC_DEFINE(HAVE_ATOMIC_BUILTINS, 1, [Define if compiler provides atomic builtins]) +fi + + + + + # Large file support AC_ARG_ENABLE(largefile, [AS_HELP_STRING([--enable-largefile],[Enable large file support @<:@default=yes@:>@])], -- cgit