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Update CMake comment about _POSIX_C_SOURCE #4124

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Mar 13, 2024
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Update CMake comment about _POSIX_C_SOURCE #4124

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4 changes: 3 additions & 1 deletion config/cmake/ConfigureChecks.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -224,7 +224,9 @@ if (CMAKE_SYSTEM_NAME MATCHES "Linux")
# 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=200809L)
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