Re: [PATCH v2 03/18] modules: add qemu-modinfo utility

[Paolo Bonzini]

On 14/06/21 10:34, Paolo Bonzini wrote:
> - modinfo.json needs to be disabled on non-ELF platforms (x86, Windows). 
>   One alternative is to use libbfd instead of including an ELF parser.
>
> - If modinfo.json has to be installed, you need to build modinfo for the 
> build machine in order to support cross compiling.  That however would 
> require a cross libbfd, which is a pain.  Do you really need to install 
> it?  Can the functionality instead be included in the main QEMU binary 
> with a query-modules command or something like that.

Another possibility to eschew .o parsing is to add something like this 
to the sources

#ifdef QEMU_MODINFO
#define MODULE_METADATA(key, value) \
   =<>= MODINFO key value
#else
#define MODULE_METADATA(key, value)
#endif

MODULE_METADATA("opts", "spice")

A Python script could parse compile_commands.json, add -E -DQEMU_MODINFO 
to the command-line option, and look in the output for the metadata.

Paolo