diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index 25c4b78..30fe725 100644 --- a/configure.ac +++ b/configure.ac @@ -1130,11 +1130,12 @@ case "$host_cpu-$host_vendor-$host_os" in ## functionality so clock_gettime and CLOCK_MONOTONIC are defined ## correctly. This was later updated to 200112L so that ## posix_memalign() is visible for the direct VFD code on Linux - ## systems. + ## systems. Even later, this was changed to 200809L to support + ## pread/pwrite in VFDs. ## ## POSIX feature information can be found in the gcc manual at: ## http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html - H5_CPPFLAGS="-D_POSIX_C_SOURCE=200112L $H5_CPPFLAGS" + H5_CPPFLAGS="-D_POSIX_C_SOURCE=200809L $H5_CPPFLAGS" ## Need to add this so that O_DIRECT is visible for the direct ## VFD on Linux systems. @@ -3266,6 +3267,47 @@ esac ## ---------------------------------------------------------------------- +## Enable use of pread/pwrite instead of read/write in certain VFDs. +## +AC_SUBST([PREADWRITE]) + +## Check these first to avoid interspersed output in the AC_ARG_ENABLE line +## below. (Probably overkill to check for both, but we'll be extra careful) +PREADWRITE_HAVE_BOTH=yes +AC_CHECK_FUNC([pread], [], [PREADWRITE_HAVE_BOTH=no]) +AC_CHECK_FUNC([pwrite], [], [PREADWRITE_HAVE_BOTH=no]) + +AC_MSG_CHECKING([whether to use pread/pwrite instead of read/write in certain VFDs]) +AC_ARG_ENABLE([preadwrite], + [AS_HELP_STRING([--enable-preadwrite], + [Enable using pread/pwrite instead of read/write in sec2/log/core VFDs. + [default=yes if pread/pwrite are present]])], + [PREADWRITE=$enableval]) + +## Set the default level. +if test "X-$PREADWRITE" = X- ; then + PREADWRITE=yes +fi + +case "X-$PREADWRITE" in + X-yes) + if test "X-$PREADWRITE_HAVE_BOTH" = "X-yes"; then + AC_DEFINE([HAVE_PREADWRITE], [1], [Define if both pread and pwrite exist.]) + AC_MSG_RESULT([yes]) + else + AC_MSG_RESULT([no]) + fi + ;; + X-no) + AC_MSG_RESULT([no]) + ;; + *) + AC_MSG_ERROR([Unrecognized value: $PREADWRITE]) + ;; +esac + + +## ---------------------------------------------------------------------- ## Enable embedded library information ## AC_MSG_CHECKING([whether to have library information embedded in the executables]) |