Roland McGrath 6ad0dcf67f
[libc] Revamp hdrgen command line and build integration (#121522)
This adds a new main command-line entry point for hdrgen, in the
new main.py.  This new interface is used for generating a header.
The old ways of invoking yaml_to_classes.py for other purposes
are left there for now, but `--e` is renamed to `--entry-point`
for consistency with the new CLI.

The YAML schema is expanded with the `header_template` key where
the corresponding `.h.def` file's path is given relative to where
the YAML file is found.  The build integration no longer gives
the `.h.def` path on the command line.  Instead, the script now
emits a depfile that's used by the cmake rules to track that.
The output file is always explicit in the script command line
rather than sometimes being derived from a directory path.
2025-01-07 15:56:12 -08:00

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YAML

header: fcntl.h
header_template: fcntl.h.def
macros: []
types:
- type_name: off_t
- type_name: mode_t
enums: []
objects: []
functions:
- name: creat
standards:
- POSIX
return_type: int
arguments:
- type: const char *
- type: mode_t
- name: fcntl
standards:
- POSIX
return_type: int
arguments:
- type: int
- type: int
- type: '...'
- name: open
standards:
- POSIX
return_type: int
arguments:
- type: const char *
- type: int
- type: '...'
- name: openat
standards:
- POSIX
return_type: int
arguments:
- type: int
- type: const char *
- type: int
- type: '...'