use mipsel-openwrt-linux-g++ -std=c++11 to compile, it has some errors "error: 'snprintf' is not a member of 'std'"

[mandy-yan]

i use mipsel-openwrt-linux-g++ -std=c++11, it got some errors below：

mipsel-openwrt-linux-g++  -fpermissive -mips32r2 -mtune=24kec -mdsp -std=c++11 -Wall -Wno-unused -Wno-format -O2 -DTIME_WHEEL -D_OPENWRT -D_GATEWAY -I. -I./src -I./src/client/Sub_Tcp_Client -I./src/client/asynQueueClient -I./src/client/http -I./src/client/mqtt -I./src/client/sendClient -I./src/client/tcp -I./src/client/udp -I./src/common/DBPool -I./src/common/SyncObj -I./src/common/aes -I./src/common/base64 -I./src/common/factory -I./src/common/json -I./src/common/jthread -I./src/common/jthread/pthread -I./src/common/log -I./src/common/md5 -I./src/common/plug -I./src/common/protbuf/g2protbuf -I./src/common/sql -I./src/common/table -I./src/common/table/scene2 -I./src/common/timer -I./src/common/timewheel -I./src/common/tinyIni -I./src/common/url -I./src/common/util -I./src/common/wifi -I./src/third_part -I./src/third_part/jsoncpp-master/include -I./src/third_part/jsoncpp-master/src/lib_json -I./src/third_part/libghttp-1.0.9 -I./src/third_part/protobuf-3.2.0/src -I./src/third_part/xnet -I./src/third_part/xnet/lib -I./src/third_part/xnet/lib/aliMqtt/inc -I./src/uci -I./src/zdevice -I/home/wingto/work/openwrt-sdk-g001/package/utils/ricigw/src/../../../..//staging_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/usr/include -I/home/wingto/work/openwrt-sdk-g001/package/utils/ricigw/src/../../../..//staging_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/usr/include/mysql -Wp,-MT,out/target/json_value.o -Wp,-MMD,out/target/json_value.o.d -fpermissive -mips32r2 -mtune=24kec -mdsp -std=c++11 -Wall -Wno-unused -Wno-format -O2 -DTIME_WHEEL -D_OPENWRT -D_GATEWAY -c -o out/target/json_value.o ./src/third_part/jsoncpp-master/src/lib_json/json_value.cpp
mipsel-openwrt-linux-g++  -fpermissive -mips32r2 -mtune=24kec -mdsp -std=c++11 -Wall -Wno-unused -Wno-format -O2 -DTIME_WHEEL -D_OPENWRT -D_GATEWAY -I. -I./src -I./src/client/Sub_Tcp_Client -I./src/client/asynQueueClient -I./src/client/http -I./src/client/mqtt -I./src/client/sendClient -I./src/client/tcp -I./src/client/udp -I./src/common/DBPool -I./src/common/SyncObj -I./src/common/aes -I./src/common/base64 -I./src/common/factory -I./src/common/json -I./src/common/jthread -I./src/common/jthread/pthread -I./src/common/log -I./src/common/md5 -I./src/common/plug -I./src/common/protbuf/g2protbuf -I./src/common/sql -I./src/common/table -I./src/common/table/scene2 -I./src/common/timer -I./src/common/timewheel -I./src/common/tinyIni -I./src/common/url -I./src/common/util -I./src/common/wifi -I./src/third_part -I./src/third_part/jsoncpp-master/include -I./src/third_part/jsoncpp-master/src/lib_json -I./src/third_part/libghttp-1.0.9 -I./src/third_part/protobuf-3.2.0/src -I./src/third_part/xnet -I./src/third_part/xnet/lib -I./src/third_part/xnet/lib/aliMqtt/inc -I./src/uci -I./src/zdevice -I/home/wingto/work/openwrt-sdk-g001/package/utils/ricigw/src/../../../..//staging_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/usr/include -I/home/wingto/work/openwrt-sdk-g001/package/utils/ricigw/src/../../../..//staging_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/usr/include/mysql -Wp,-MT,out/target/json_reader.o -Wp,-MMD,out/target/json_reader.o.d -fpermissive -mips32r2 -mtune=24kec -mdsp -std=c++11 -Wall -Wno-unused -Wno-format -O2 -DTIME_WHEEL -D_OPENWRT -D_GATEWAY -c -o out/target/json_reader.o ./src/third_part/jsoncpp-master/src/lib_json/json_reader.cpp
./src/third_part/jsoncpp-master/src/lib_json/json_reader.cpp: In member function 'std::string Json::Reader::getLocationLineAndColumn(Json::Reader::Location) const':
./src/third_part/jsoncpp-master/src/lib_json/json_reader.cpp:34:18: error: 'snprintf' is not a member of 'std'
 #define snprintf std::snprintf
                  ^
./src/third_part/jsoncpp-master/src/lib_json/json_reader.cpp:817:3: note: in expansion of macro 'snprintf'
   snprintf(buffer, sizeof(buffer), "Line %d, Column %d", line, column);
   ^
./src/third_part/jsoncpp-master/src/lib_json/json_reader.cpp:34:18: note: suggested alternative:
 #define snprintf std::snprintf
                  ^
./src/third_part/jsoncpp-master/src/lib_json/json_reader.cpp:817:3: note: in expansion of macro 'snprintf'
   snprintf(buffer, sizeof(buffer), "Line %d, Column %d", line, column);
   ^
In file included from /home/wingto/work/openwrt-sdk-g001/staging_dir/toolchain-mipsel_24kec+dsp_gcc-4.8-linaro_uClibc-0.9.33.2/mipsel-openwrt-linux-uclibc/include/c++/4.8.3/cstdio:42:0,
                 from ./src/third_part/jsoncpp-master/src/lib_json/json_reader.cpp:13:
/home/wingto/work/openwrt-sdk-g001/staging_dir/toolchain-mipsel_24kec+dsp_gcc-4.8-linaro_uClibc-0.9.33.2/include/stdio.h:358:12: note:   'snprintf'
 extern int snprintf (char *__restrict __s, size_t __maxlen,

[nlohmann]

This is not a bug in the library, but a bug in your compiler which is not compliant to C++11 or you have strange defines.

Who made the

#define snprintf std::snprintf

define? Furthermore, the header json.hpp is not mentioned in the error at all.

[nlohmann]

In order to asses your issue, we need the following information:

• What is the issue you have?

• Please describe the steps to reproduce the issue. Can you provide a small but working code example?

• What is the expected behavior?

• And what is the actual behavior instead?

• Which compiler and operating system are you using? Is it a supported compiler?

• Did you use a released version of the library or the version from the develop branch?

• If you experience a compilation error: can you compile and run the unit tests?

[falbrechtskirchinger]

Based on the paths your problem is with jsoncpp, a different project/library. Try filing your issue here: https://github.com/open-source-parsers/jsoncpp

[nlohmann]

Good point!