use of undeclared identifier 'UINT8_MAX'

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)

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?

@nlohmann

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

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

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

Good point!

🚧 replaced throws (#440) and _MAX/_MIN macros (#451)

@biyunhuang

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?

@biyunhuang

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

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.

Navigation Menu

Repository navigation

use of undeclared identifier 'UINT8_MAX' #451

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

use of undeclared identifier 'UINT8_MAX' #451

Description

Activity

nlohmann commented on Feb 14, 2017

biyunhuang commented on Feb 15, 2017

nlohmann commented on Feb 15, 2017

TurpentineDistillery commented on Feb 15, 2017

nlohmann commented on Feb 15, 2017

nlohmann commented on Feb 15, 2017

nlohmann commented on Feb 19, 2017

nlohmann commented on Feb 21, 2017

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions