fix clang -Wtautological-compare with unsigned enum

diff --git a/cache.h b/cache.h
index 18fdd18f3674b1d7c62de65509bdb7bc57743395..98b62bcb5ae0c95db95a971bfa9ccaa2b1fcc8a0 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1136,6 +1136,9 @@ extern int check_repository_format_version(const char *var, const char *value, v
 extern int git_env_bool(const char *, int);
 extern int git_config_system(void);
 extern int config_error_nonbool(const char *);
+#if defined(__GNUC__) && ! defined(__clang__)
+#define config_error_nonbool(s) (config_error_nonbool(s), -1)
+#endif
 extern const char *get_log_output_encoding(void);
 extern const char *get_commit_output_encoding(void);