jansson: Disable format string validation if constexpr vector is not available

pjungkamp · pjungkamp · commit af6e18413d5e · 2026-02-26T17:11:29.000+01:00
Signed-off-by: Philipp Jungkamp &lt;philipp.jungkamp@rwth-aachen.de&gt;
diff --git a/common/include/villas/jansson.hpp b/common/include/villas/jansson.hpp
@@ -297,7 +297,9 @@ void janssonUnpack(::json_t *json,
 template <typename... Args> class JanssonPackFormatString {
 public:
   consteval JanssonPackFormatString(char const *fmt) : fmt(fmt) {
+#if defined(__cpp_lib_constexpr_vector) && __cpp_constexpr >= 201907L
     validate(fmt);
+#endif
   }
 
   constexpr char const *c_str() const { return fmt; }

Original file line number	Diff line number	Diff line change
`@@ -297,7 +297,9 @@ void janssonUnpack(::json_t *json,`
`297`	`297`	`template <typename... Args> class JanssonPackFormatString {`
`298`	`298`	`public:`
`299`	`299`	`consteval JanssonPackFormatString(char const *fmt) : fmt(fmt) {`
	`300`	`+#if defined(__cpp_lib_constexpr_vector) && __cpp_constexpr >= 201907L`
`300`	`301`	`validate(fmt);`
	`302`	`+#endif`
`301`	`303`	`}`
`302`	`304`
`303`	`305`	`constexpr char const *c_str() const { return fmt; }`