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m4/atomic_operations.m4
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Yann E. MORIN
m4: fix detection of atomics
10 июл 2016, 11:47
10 июл 2016, 11:47
df08771
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# rsyslog # # atomic_operations.m4 - autoconf macro to check if compiler supports atomic # operations # # rgerhards, 2008-09-18, added based on # http://svn.apache.org/repos/asf/apr/apr/trunk/configure.in # # AC_DEFUN([RS_ATOMIC_OPERATIONS], [AC_CACHE_CHECK([whether the compiler provides atomic builtins], [ap_cv_atomic_builtins], [AC_LINK_IFELSE([AC_LANG_PROGRAM([], [[ 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])]) if test "$ap_cv_atomic_builtins" = "yes"; then AC_DEFINE(HAVE_ATOMIC_BUILTINS, 1, [Define if compiler provides atomic builtins]) fi ])