parsers: dynamically register parsers

Currently, we require all parsers to be defined in an array in
parsers.c.

This change removes this requirement, by introducting a
register_parser() macro, which adds a constructor to register the parser
with the core parser infrastructure.

Because each parser no longer resolves an undefined symbol, we need to
use a `ld -r` object for libparser, instead of using libtool, which
creates a .a (and hence has no parsers included).

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/discover/grub2-parser.c b/discover/grub2-parser.c
index eaf3cd3..4a1acf5 100644
--- a/discover/grub2-parser.c
+++ b/discover/grub2-parser.c
@@ -191,8 +191,10 @@ static int grub2_parse(struct discover_context *dc, char *buf, int len)
 	return 1;
 }
 
-struct parser __grub2_parser = {
+static struct parser grub2_parser = {
 	.name		= "grub2",
 	.parse		= grub2_parse,
 	.filenames	= grub2_conf_files,
 };
+
+register_parser(grub2_parser);