I am using go-hdf5 to read an hdf5 file into golang. I am on windows7 using a pretty recent copy of mingw and hdf5 1.8.14_x86 and it seems like trying to use any of the predefined types doesn't work, let's focus for example on T_NATIVE_UINT64. I have reduced the issue to the following, which basically leaves go-hdf5 out of the problem and points at something quite fundamental going wrong:
package main
/*
#cgo CFLAGS: -IC:/HDF_Group/HDF5/1.8.14_x86/include
#cgo LDFLAGS: -LC:/HDF_Group/HDF5/1.8.14_x86/bin -lhdf5 -lhdf5_hl
#include "hdf5.h"
#include <stdio.h>
void print_the_value2() { printf("the value of the constant is %d
", H5T_NATIVE_UINT64); }
*/
import "C"
func main() {
C.print_the_value2()
}
You obviously need to have hdf5 and point the compiler at the headers/dlls and running go get, then executing prints this on my pc
the value of the constant is -1962924545
Running variations of the above, in how/where the constant is read, will give different answers for the value of H5T_NATIVE_UINT64. However I am pretty sure that is none are the right value and in fact trying to use a type with the id returned doesn't work, unsurprisingly.
If I write and run a "real" C program, I get different results
#include <stdio.h>
#include "hdf5.h"
hid_t _go_hdf5_H5T_NATIVE_UINT64() { return H5T_NATIVE_UINT64; }
int main()
{
printf("the value of the constant is %d", _go_hdf5_H5T_NATIVE_UINT64());
}
Compiling using
C:\Temp>gcc -IC:/HDF_Group/HDF5/1.8.14_x86/include -LC:/HDF_Group/HDF5/1.8.14_x86/bin -lhdf5 -lhdf5_hl -o stuff.exe stuff.c
and running gives me
the value of the constant is 50331683
And that appears to be the right value as I can use it directly from my go program. Obviously I want to be able to use the constants instead. Any idea why this could be happening?
Extra info following comments below:
I looked for the definition of H5T_NATIVE_UINT64 in the hdf5 headers and see the following
c:\HDF_Group\HDF5\1.8.14_x86\include>grep H5T_NATIVE_UINT64 *
H5Tpkg.h:H5_DLLVAR size_t H5T_NATIVE_UINT64_ALIGN_g;
H5Tpublic.h:#define H5T_NATIVE_UINT64 (H5OPEN H5T_NATIVE_UINT64_g)
H5Tpublic.h:H5_DLLVAR hid_t H5T_NATIVE_UINT64_g;
The whole header is here
http://www.hdfgroup.org/ftp/HDF5/prev-releases/hdf5-1.8.14/src/unpacked/src/H5Tpublic.h
Thanks!
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