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Fix detection of the GCC __sync intrinsics.

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We have to use the return value, otherwise GCC optimises the code
by using instructions that don't return anything. That won't
match what we actually use in dbus-sysdeps-unix.c
This commit is contained in:
Thiago Macieira 2009-07-16 15:17:25 +02:00
parent 89f70b1949
commit 9f06daccce
1 changed files with 1 additions and 1 deletions
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2
configure.in
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@ -595,7 +595,7 @@ fi
AC_CACHE_CHECK([whether $CC knows __sync_sub_and_fetch()],
dbus_cv_sync_sub_and_fetch,
[AC_LINK_IFELSE(
AC_LANG_PROGRAM([], [[int a = 4; __sync_sub_and_fetch(&a, 4);]]),
AC_LANG_PROGRAM([], [[int a = 4; int b = __sync_sub_and_fetch(&a, 4);]]),
[dbus_cv_sync_sub_and_fetch=yes],
[dbus_cv_sync_sub_and_fetch=no])
])