Linking HDF5 with CMake for C, C++ and Fortran
CMake links HDF5 into your C, C++, or Fortran program with just two lines in CMakeLists.txt. If experiencing trouble finding HDF5 with CMake, try our FindHDF5.cmake, which is more up to date than the FindHDF5.cmake included with CMake. An example CMake for writing network data to HDF5 in C: CMakeLists.txt.
Windows Subsystem for Linux users should ensure “/etc/wsl.conf” includes the following to avoid linking native Windows HDF5 from WSL:
[interop]
enabled=false
appendWindowsPath=false
We show an example for C and another example for Fortran. “HL” refers to the high-level HDF5 interface that is more convenient and thus commonly used.
Note: if terminal has the Conda environment loaded and you keep getting the Conda HDF5 library, do first:
conda deactivate
before running the CMake configure commadn.
project(myproj LANGUAGES C)
find_package(HDF5 REQUIRED COMPONENTS C HL)
add_executable(myprog myprog.c)
target_link_libraries(myprog PRIVATE HDF5::HDF5)
project(myproj LANGUAGES Fortran)
find_package(HDF5 REQUIRED COMPONENTS Fortran HL)
add_executable(myprog myprog.f90)
target_link_libraries(myprog PRIVATE HDF5::HDF5)
HDF5 C example
The HDF5 syntax is quite similar (and simpler) for Fortran.
See the hdf5 directory of
Fortran 2018 examples
for more.
#include "hdf5.h"
#define FILE "dset.h5"
int main() {
hid_t file_id, dataset_id,dataspace_id; /* identifiers */
herr_t status;
int i, j, dset_data[4][6], read_data[4][6];
hsize_t dims[2];
/* Initialize the dataset. */
for (i = 0; i < 4; i++)
for (j = 0; j < 6; j++)
dset_data[i][j] = i * 6 + j + 1;
/* Create a new file using default properties. */
file_id = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create the data space for the dataset. */
dims[0] = 4;
dims[1] = 6;
dataspace_id = H5Screate_simple(2, dims, NULL);
/* Create the dataset. */
dataset_id = H5Dcreate2(file_id, "/dset", H5T_STD_I32BE, dataspace_id,
H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
/* Write the dataset. */
status = H5Dwrite(dataset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
dset_data);
/* End access to the dataset and release resources used by it. */
status = H5Dclose(dataset_id);
//------------------------------------------------------
/* Open an existing dataset. */
dataset_id = H5Dopen2(file_id, "/dset", H5P_DEFAULT);
status = H5Dread(dataset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
read_data);
for (i = 0; i < 4; i++)
for (j = 0; j < 6; j++)
printf("%d ",read_data[i][j]); // 1-24
/* Close the dataset. */
status = H5Dclose(dataset_id);
/* Close the file. */
status = H5Fclose(file_id);
}
HDF5 compiler macros
As an alternative (or companion to) CMake, one can use compiler macros for HDF5.
HDF group provides compiler macro
h5cc
linking the needed HDF5 libraries upon installing libhdf5-dev:
h5cc myprog.c func.c -lm
h5cc: Ch5c++: C++h5fc: Fortran