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experimental-features.hh: Don't include json-utils.hh

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This caused nlohmann/json.hpp to leak into a lot of compilation units,
which is slow (when not using precompiled headers).

Cuts build time from 46m24s to 42m5s (real time with -j24: 2m42s to
2m24s).
This commit is contained in:
Eelco Dolstra 2024-10-04 14:56:43 +02:00
parent 4e8a9e0ed4
commit 15e5684884
11 changed files with 25 additions and 12 deletions
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9
src/libutil/json-utils.hh
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@ -3,12 +3,13 @@
#include <nlohmann/json.hpp>
#include <list>
#include <nlohmann/json_fwd.hpp>
#include "types.hh"
namespace nix {
enum struct ExperimentalFeature;
const nlohmann::json * get(const nlohmann::json & map, const std::string & key);
nlohmann::json * get(nlohmann::json & map, const std::string & key);
@ -71,6 +72,12 @@ struct json_avoids_null<std::list<T>> : std::true_type {};
template<typename K, typename V>
struct json_avoids_null<std::map<K, V>> : std::true_type {};
/**
* `ExperimentalFeature` is always rendered as a string.
*/
template<>
struct json_avoids_null<ExperimentalFeature> : std::true_type {};
}
namespace nlohmann {