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-rw-r--r--config/cmake_ext_mod/ConfigureChecks.cmake8
1 files changed, 6 insertions, 2 deletions
diff --git a/config/cmake_ext_mod/ConfigureChecks.cmake b/config/cmake_ext_mod/ConfigureChecks.cmake
index c24c1f8..986280f 100644
--- a/config/cmake_ext_mod/ConfigureChecks.cmake
+++ b/config/cmake_ext_mod/ConfigureChecks.cmake
@@ -274,10 +274,12 @@ if (NOT WINDOWS)
# 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
- set (HDF_EXTRA_C_FLAGS -D_POSIX_C_SOURCE=200112L)
+ set (HDF_EXTRA_C_FLAGS -D_POSIX_C_SOURCE=200809L)
# Need to add this so that O_DIRECT is visible for the direct
# VFD on Linux systems.
@@ -506,6 +508,8 @@ CHECK_FUNCTION_EXISTS (lround ${HDF_PREFIX}_HAVE_LROUND)
CHECK_FUNCTION_EXISTS (lroundf ${HDF_PREFIX}_HAVE_LROUNDF)
CHECK_FUNCTION_EXISTS (lstat ${HDF_PREFIX}_HAVE_LSTAT)
+CHECK_FUNCTION_EXISTS (pread ${HDF_PREFIX}_HAVE_PREAD)
+CHECK_FUNCTION_EXISTS (pwrite ${HDF_PREFIX}_HAVE_PWRITE)
CHECK_FUNCTION_EXISTS (rand_r ${HDF_PREFIX}_HAVE_RAND_R)
CHECK_FUNCTION_EXISTS (random ${HDF_PREFIX}_HAVE_RANDOM)
CHECK_FUNCTION_EXISTS (round ${HDF_PREFIX}_HAVE_ROUND)