use of undeclared identifier 'UINT8_MAX'

[biyunhuang]

hello, i meet this error , json.hpp:6365:59: error: use of undeclared identifier 'UINT8_MAX',
Can someone help me with this question?

i compile in ndk , the version is ndk-r10e
this is my content in application.mk：

APP_STL := c++_shared
NDK_TOOLCHAIN_VERSION := clang3.6
APP_CPPFLAGS += -std=c++11 -frtti -fexceptions
APP_PLATFORM = android-19 (if android-21 ,Will not have this problem)

[nlohmann]

From http://stackoverflow.com/questions/16748392/cant-find-symbols-in-stdint-h:

The macros are available when __STDC_LIMIT_MACROS is defined (additionally __STDC_CONSTANT_MACROS seems to be missing as well). This is probably incorrectly gated or missing when compiling c++. Objective-C and C pick up on these defines for UINT8_MAX and accompanying macros. For now you can define both of those macros globally and it should have no ill effects on your project.

Could you try to define __STDC_LIMIT_MACROS when compiling your code?

[biyunhuang]

@nlohmann oh yeah, it's helpful for me, thank you very much!

[nlohmann]

Good to hear. I shall add a comment to the README.

[TurpentineDistillery]

Why not use numeric_limits here, considering that they are already used elsewhere?

[nlohmann]

Good point!

[nlohmann]

I replaced the macros with calls to numeric_limits. @biyunhuang Could you try the current version if it works without the need of defining __STDC_LIMIT_MACROS?

[nlohmann]

@biyunhuang Could you please try the current version if it works without the need of defining __STDC_LIMIT_MACROS?

[nlohmann]

I could reproduce the original error as well as verify it is fixed with the current version with the following configuration:

Application.mk

APP_ABI := x86
APP_PLATFORM := android-19
NDK_TOOLCHAIN_VERSION := clang3.6
APP_STL := c++_shared
APP_BUILD_SCRIPT := Android.mk

Android.mk

LOCAL_PATH := .
include $(CLEAR_VARS)
LOCAL_MODULE := testfile.out
LOCAL_SRC_FILES := testfile.cpp
LOCAL_C_INCLUDES += src
LOCAL_CPP_FEATURES += exceptions rtti
LOCAL_CPPFLAGS += -fexceptions -frtti -std=c++11
include $(BUILD_EXECUTABLE)

testfile.cpp

#include <json.hpp>

using json = nlohmann::json;

int main()
{
    json j = 1;
}

and Android NDK r10e from https://github.com/android-ndk/ndk/wiki.