On 05 Feb 2020, at 21:40, Sebastian Kemper <sebastian...@gmx.net> wrote:
> APR's configure script uses AC_TRY_RUN to detect whether /dev/zero can > be mmaped. When cross-compiling this defaults to no. While APR compiles > fine like this (since r1873594 in the APR 1.7 branch), the apr_lock > implementation method falls back to SysV IPC semget(). > > <snip> > checking for mmap that can map /dev/zero... no > <snip> > decision on apr_lock implementation method... SysV IPC semget() > <snip> > > This commit adds a cache check with which users who cross-compile APR > can influence the outcome of the test by setting the variable > ac_cv_mmap__dev_zero=yes: > > <snip> > checking for mmap that can map /dev/zero... (cached) yes > <snip> > decision on apr_lock implementation method... pthread pshared mutex > <snip> > > This way the new default apr_lock mechanism can also be used when > cross-compiling (if /dev/zero is in fact mmapable that is). > > Index: configure.in > =================================================================== > --- configure.in (revision 1873663) > +++ configure.in (working copy) > @@ -1186,8 +1186,9 @@ > # Not all systems can mmap /dev/zero (such as HP-UX). Check for that. > if test "$ac_cv_func_mmap" = "yes" && > test "$ac_cv_file__dev_zero" = "yes"; then > - AC_MSG_CHECKING(for mmap that can map /dev/zero) > - AC_TRY_RUN([ > + AC_CACHE_CHECK([for mmap that can map /dev/zero], > + [ac_cv_mmap__dev_zero], > + [AC_TRY_RUN([ > #include <sys/types.h> > #include <sys/stat.h> > #include <fcntl.h> > @@ -1210,9 +1211,7 @@ > return 3; > } > return 0; > - }], [], [ac_cv_file__dev_zero=no], [ac_cv_file__dev_zero=no]) > - > - AC_MSG_RESULT($ac_cv_file__dev_zero) > + }], [], [ac_cv_file__dev_zero=no], [ac_cv_file__dev_zero=no])]) > fi > > # Now we determine which one is our anonymous shmem preference. Thanks for this, this is added as http://svn.apache.org/viewvc?rev=1875062&view=rev <http://svn.apache.org/viewvc?rev=1875062&view=rev> and backported as http://svn.apache.org/viewvc?rev=1875064&view=rev <http://svn.apache.org/viewvc?rev=1875064&view=rev> Regards, Graham —
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