build-sys: add check for gperf lookup function signature (#5055)

gperf-3.1 generates lookup functions that take a size_t length
parameter instead of unsigned int. Test for this at configure time.

Fixes: https://github.com/systemd/systemd/issues/5039

2 files changed, 2 insertions, 2 deletions

diff --git a/src/resolve/dns-type.c b/src/resolve/dns-type.c
index aaf5ed62c1..d89ae28dcd 100644
--- a/src/resolve/dns-type.c
+++ b/src/resolve/dns-type.c
@@ -29,7 +29,7 @@ typedef const struct {
 } dns_type;
 
 static const struct dns_type_name *
-lookup_dns_type (register const char *str, register unsigned int len);
+lookup_dns_type (register const char *str, register GPERF_LEN_TYPE len);
 
 #include "dns_type-from-name.h"
 #include "dns_type-to-name.h"
diff --git a/src/resolve/resolved-conf.h b/src/resolve/resolved-conf.h
index fc425a36b2..8184d6cadf 100644
--- a/src/resolve/resolved-conf.h
+++ b/src/resolve/resolved-conf.h
@@ -41,7 +41,7 @@ int manager_parse_search_domains_and_warn(Manager *m, const char *string);
 int manager_add_dns_server_by_string(Manager *m, DnsServerType type, const char *word);
 int manager_parse_dns_server_string_and_warn(Manager *m, DnsServerType type, const char *string);
 
-const struct ConfigPerfItem* resolved_gperf_lookup(const char *key, unsigned length);
+const struct ConfigPerfItem* resolved_gperf_lookup(const char *key, GPERF_LEN_TYPE length);
 
 int config_parse_dns_servers(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_search_domains(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);