Optimization does not handle conversion well, particularly on some Linux machines, with gcc 3.* and 4.*.
To get around the problem, turn off optimization. You can do this by editting the ./config/gnu-flags file in the HDF5 source code and setting PROD_CFLAGS from "-O" to "-O0".
Here is the code that needs to be modified:
gcc-3.[0-4]*|gcc-4.[0123]*)
# The optimization level is reduced for gcc 3.* and 4.* due to problems
# with code generation for src/H5Tconv.c with the -O2 & -O3
# optimization levels (which shows up as failures for various integer
# types -> long long conversions in the test/dtypes test). Perhaps
# later versions of gcc will fix this bug... - QAK - 2003/10/20
PROD_CFLAGS="-O"
;;
- - Last modified:May 16th 2011