#2923: ADIOS2 compilation fails due to unknown type name ‘INT4’

Reporter: Cheng-Hsin Cheng Status: new Milestone: Version: ET_2025_05 Type: bug Priority: major Component: EinsteinToolkit thorn

ExternalLibraries/ADIOS2 compilation fails at the thirdparth/ffs stage, which seemed to happen when the size of int was not correctly detected by CMake.

This error happened when I was trying to compile on Delta using cmake/3.31.8 and GNU 13.3.1 compilers, more details on the configuration [here](https://bitbucket.org/simfactory/simfactory2/pull-requests/76)

The first error occurred here ``` [ 15%] Building C object thirdparty/ffs/ffs/CMakeFiles/ffs.dir/ffs/ffs_marshal.c.o In file included from /projects/bcvu/chcheng3/ETK_2025_05/Cactus/configs/et-test-simfactory/scratch/build/ADIOS2/ADIOS2-2.10.2/thirdparty/ffs/ffs/ffs/ffs.c:10: /projects/bcvu/chcheng3/ETK_2025_05/Cactus/configs/et-test-simfactory/scratch/build/ADIOS2/ADIOS2-2.10.2/thirdparty/ffs/ffs/fm/fm_internal.h:150:5: error: unknown type name ‘INT4’ 150 | INT4 field_size; | ^~~~ ```

In the header `fm_internal.h` the macro `INT4` seems to be undefined when CMake failed to set SIZEOF_INT correctly ``` #if SIZEOF_INT == 4 #define INT4 int #define UINT4 unsigned int #endif ```

I am not sure now to get CMake to set it correctly, and need some help resolving it.

-- Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2923/adios2-compilation...