Red Hat Bugzilla – Bug 19114
working mmap not found by autoconf / getpagesize header problem
Last modified: 2007-04-18 12:29:21 EDT
Setup: Compiling Livid/OMS from CVS - www.linuxvideo.org on RH 7.0 Steps to Repeat: 1. Checkout current cvs (3pm, 14th October) 2. Run autogen.sh from the oms tree. Description: configure fails to detect mmap as working. tracing into the autoconf test shows undefined references to getpagesize/read/write/open/umask/rand etc. (See config.log) The autoconf test in /usr/share/autoconf/acspecific.m4 does not appear to contain the correct set of header includes for an error-free test of mmap functionality. RH7 appears to need at least stdlib.h (for rand) and sys/stat.h (for umask) added to the headers used in the test. The autoconf with RH7 also doesn't actually include unistd.h because as part of the earlier OMS configure, HAVE_GETPAGESIZE is defined. This breaks the test in acspecific too - unistd.h is needed on RH7 for write/read/close/etc. Cheers, Mark
Thank you for the report and sorry for the slow response. [This is already fixed in autoconf-2.50.] The following patch seems to solve the problem in 2.13. Tested on oms-0.1.2. --- autoconf-2.13/acspecific.m4.orig Fri Jun 29 16:26:39 2001 +++ autoconf-2.13/acspecific.m4 Fri Jun 29 16:26:39 2001 @@ -1010,7 +1043,7 @@ ]) AC_DEFUN(AC_FUNC_MMAP, -[AC_CHECK_HEADERS(unistd.h) +[AC_CHECK_HEADERS(stdlib.h unistd.h sys/stat.h sys/types.h) AC_CHECK_FUNCS(getpagesize) AC_CACHE_CHECK(for working mmap, ac_cv_func_mmap_fixed_mapped, [AC_TRY_RUN([ @@ -1039,11 +1072,24 @@ #include <fcntl.h> #include <sys/mman.h> +#if HAVE_SYS_TYPES_H +# include <sys/types.h> +#endif + +#if HAVE_STDLIB_H +# include <stdlib.h> +#endif + +#if HAVE_SYS_STAT_H +# include <sys/stat.h> +#endif + +#if HAVE_UNISTD_H +# include <unistd.h> +#endif + /* This mess was copied from the GNU getpagesize.h. */ #ifndef HAVE_GETPAGESIZE -# ifdef HAVE_UNISTD_H -# include <unistd.h> -# endif /* Assume that all systems that can run configure have sys/param.h. */ # ifndef HAVE_SYS_PARAM_H