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CMake: Disable mmap on all windows OSes #3349

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Merged
WardF merged 1 commit into from
Apr 7, 2026
+3 −7
Merged

CMake: Disable mmap on all windows OSes #3349

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10 changes: 3 additions & 7 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -403,9 +403,10 @@ endif(NOT NETCDF_ENABLE_V2_API)
option(NETCDF_BUILD_UTILITIES "Build ncgen, ncgen3, ncdump." ON)
option(NETCDF_GENERATE_NCGEN "Automatically regenerate ncgen C files if required" OFF)

include(CMakeDependentOption)

# Option to use MMAP
option(NETCDF_ENABLE_MMAP "Use MMAP." ON)
cmake_dependent_option(NETCDF_ENABLE_MMAP "Use MMAP." ON "NOT WIN32" OFF)

# Option to use examples.
option(NETCDF_ENABLE_EXAMPLES "Build Examples" ON)
Expand Down Expand Up @@ -690,8 +691,6 @@ set(NETCDF_PLUGIN_SEARCH_PATH "${DEFAULT_PLUGIN_SEARCH_PATH}")
# Try to enable NCZarr zip support
option(NETCDF_ENABLE_NCZARR_ZIP "Enable NCZarr ZIP support." ${NETCDF_ENABLE_NCZARR})

include(CMakeDependentOption)

# libdl is always available; built-in in Windows and OSX
cmake_dependent_option(NETCDF_ENABLE_PLUGINS "Enable dynamically loaded plugins (default on)."
ON "BUILD_SHARED_LIBS" OFF)
Expand Down Expand Up @@ -1352,10 +1351,7 @@ endif()
endif()

# Check to see if MAP_ANONYMOUS is defined.
if(MSVC)
message(WARNING "mmap not supported under visual studio: disabling MMAP support.")
set(NETCDF_ENABLE_MMAP OFF)
else()
if(NETCDF_ENABLE_MMAP)
CHECK_C_SOURCE_COMPILES("
#include <sys/mman.h>
int main() {int x = MAP_ANONYMOUS;}" HAVE_MAPANON)
Expand Down
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