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e52f878720
If one is found, it will be used. Otherwise the included version in lib/nlohmann-json will be used. Implements #1858.
33 lines
833 B
Plaintext
33 lines
833 B
Plaintext
dnl
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dnl Check for nlohmann's json-cpp library
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dnl
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AC_CACHE_CHECK([nlohmann's json-cpp],[ac_cv_nlohmann_jsoncpp],[
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AC_LANG_PUSH(C++)
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AC_TRY_COMPILE([
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#include <cstdint>
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#include <iostream>
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#include <limits>
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#include <json.hpp>
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],[
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nlohmann::json json{
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{ "unsigned_64bit_integer", std::numeric_limits<std::uint64_t>::max() },
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{ "signed_64bit_integer", std::numeric_limits<std::int64_t>::min() },
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};
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std::cout << json.dump();
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],[ac_cv_nlohmann_jsoncpp=yes],[ac_cv_nlohmann_jsoncpp=no])
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AC_LANG_POP
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])
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if test x"$ac_cv_nlohmann_jsoncpp" = xyes; then
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AC_MSG_NOTICE([Using the system version of nlohmann json-cpp])
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AC_DEFINE([HAVE_NLOHMANN_JSONCPP],[1],[Define if nlohmann's json-cpp is available.])
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else
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AC_MSG_NOTICE([Using the internal version of nlohmann json-cpp])
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fi
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