[email protected] wrote on Thu, Mar 08, 2012 at 20:07:43 -0000: > Author: stefan2 > Date: Thu Mar 8 20:07:43 2012 > New Revision: 1298554 > > URL: http://svn.apache.org/viewvc?rev=1298554&view=rev > Log: > Teach subversion to detect the availability of GCC's atomic built-ins > for 64 bit items. This code was taken from APR and tweaked slightly. > > * build/ac-macros/svn-macros.m4 > (SVN_CHECK_FOR_ATOMIC_BUILTINS): new macro > * configure.ac > call the new macro, set SVN_HAS_ATOMIC_BUILTINS #define > > Modified: > subversion/branches/revprop-cache/build/ac-macros/svn-macros.m4 > subversion/branches/revprop-cache/configure.ac > > Modified: subversion/branches/revprop-cache/build/ac-macros/svn-macros.m4 > URL: > http://svn.apache.org/viewvc/subversion/branches/revprop-cache/build/ac-macros/svn-macros.m4?rev=1298554&r1=1298553&r2=1298554&view=diff > ============================================================================== > --- subversion/branches/revprop-cache/build/ac-macros/svn-macros.m4 (original) > +++ subversion/branches/revprop-cache/build/ac-macros/svn-macros.m4 Thu Mar > 8 20:07:43 2012 > @@ -202,3 +202,44 @@ AC_DEFUN([SVN_REMOVE_STANDARD_LIB_DIRS], > printf "%s" "${output_flags# }" > fi > ]) > + > +AC_DEFUN([SVN_CHECK_FOR_ATOMIC_BUILTINS], > +[ > + AC_CACHE_CHECK([whether the compiler provides atomic builtins], > [ap_cv_atomic_builtins], > + [AC_TRY_RUN([ > + int main() > + { ... > + }], [ap_cv_atomic_builtins=yes], [ap_cv_atomic_builtins=no], > [ap_cv_atomic_builtins=no])])
Mostly a nitpick, but this configure variable is in httpd's namespace (ap_*), not svn's --- so in principle, we should rename the variable to the svn_* namespace. Daniel (Yes, it's not a problem for the majority of downstream consumers. Agreed. But raising it, partially due to similar issues being raised on other ASF lists recently.)
