Dave, Thanks for offering to take a look at the logfile. I'm attaching it, along with the config.cache I used. The command used was: ./configure --disable-dap --disable-libxml2 CPPFLAGS="-I/home/root/WRF/include" LDFLAGS="-L/home/root/WRF/lib" --host=riscv64-linux-gnu --build=riscv64-linux-gnu --cache-file=config.cache 2>&1 | tee configure-net.out Alvaro ________________________________ From: Dave Allured - NOAA Affiliate <dave.allured@xxxxxxxx> Sent: Monday, May 26, 2025 2:03 PM To: Alvaro Fernandez <afernandez@xxxxxxxxxxxxxxx> Cc: netcdfgroup@xxxxxxxxxxxxxxxx <netcdfgroup@xxxxxxxxxxxxxxxx> Subject: Re: [netcdfgroup] Difficulty configuring NETCDF on Linux QEMU This is the first time you received an email from this sender (dave.allured@xxxxxxxx). Exercise caution when clicking links, opening attachments or taking further action, before validating its authenticity. > configure: error: cannot compute sizeof (size_t) There is a known generic problem in configure scripts. Internally they use a small C program for type checking. Sometimes that test program fails for some other reason, something like library not found; and the error message does not report the real problem. That is probably what is happening here. A careful examination of config.log may reveal the real problem. Feel free to post config.log as link or attachment, and I will take a look. Alternatively, try building netCDF with Cmake rather than configure. It uses completely different code for testing system features. On Mon, May 26, 2025 at 11:24 AM Alvaro Fernandez <afernandez@xxxxxxxxxxxxxxx<mailto:afernandez@xxxxxxxxxxxxxxx>> wrote: Hi, I'm trying to build NETCDF on (a QEMU emulation of) a RISC-V platform we're developing. I've successfully built other libraries (like HDF5, zlib, etc.) on this QEMU with gcc 14.2.0. However, I am having difficulty completing the configuration phase of the NETCDF build process. This machine will not be accessing the web or pulling down anything, so I disabled DAP and XML, and am not giving it curl. I started with this configure command: ./configure --disable-dap --disable-libxml2 CPPFLAGS="-I/home/root/WRF/include" LDFLAGS="-L/home/root/WRF/lib" 2>&1 | tee configure-net.out But I get errors like: checking size of size_t... configure: error: in '/home/root/repos/netcdf-c-4.9.3': configure: error: cannot compute sizeof (size_t) See 'config.log' for more details I reasoned that the configure script might be confused about the host or built targets, so I decided to be explicit. Below is the latest attempt. I added the cache file: root@qemuriscv64:~/repos/netcdf-c-4.9.3# cat config.cache ac_cv_sizeof_off_t=8 And then I ran: ./configure --disable-dap --disable-libxml2 CPPFLAGS="-I/home/root/WRF/include" LDFLAGS="-L/home/root/WRF/lib" --host=riscv64-linux-gnu --build=riscv64-linux-gnu --cache-file=config.cache 2>&1 | tee configure-net.out It fails with the same error. This error is detected in line 26715 of the configure script. I see from the comments that this test serves to guard against an error in the HP compiler. Is this still a useful test? I would suspect our toolchain usually, but it's built hdf5 and multiple other applications. Thanks in advance, Alvaro Fernandez, PhD Inspire Semi
Attachment:
config.cache
Description: config.cache
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config.log
Description: config.log
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configure-net.out
Description: configure-net.out
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