GCC出现warning: integer constant is too large for 'long' type"

最新推荐文章于 2023-10-17 10:58:51 发布
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#嵌入式

The warning message can be safely ignored, as mb-gcc is not doing anything wrong; the 64-bit computing is in fact correct.

This warning occurs because gcc is strict in syntax and requires LL on the end of such constants. This warning message disappears if the integer is appended with LL.

long long int test = 0x0008888000000000LL;

http://mazaoliang.blog.163.com/blog/static/138455093201151603823383/


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warning: integer constant is too large for "long" type
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32位嵌入式处理器编程：warning: integer constant is too large for 'long' type
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疑问描述 Keywords: EDK, long long integer, 64-bit, SW, mb-gcc, powerpc-eabi-gcc, compiler, C/C++ , g++ When I define a long long integer data type in SW application in EDK, a warning / error similar t
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今天碰到 C++ 的一个基础问题，让我一时有点懵。这个错误是因为在printf内使用了单引号。
warning: character constant too long for its type
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今天有人问了我关于C的一个基础问题。让我一时有点懵。看了半天才反应过来，我相信大部分刚开始接触C的人应该都遇到过在linux环境下printf输出一个字符串的时候编译失败，给出一个警告：warning: character constant too long for its type 这个错误是因为在printf内使用了单引号' '导致的。将其更改为双引号 " " 即可解决。
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检查一下cout<<’ xxxxxxxxxxx ’ 是不是使用单引号了，改成双引号就可以了。
root@ubuntu:/home/t101/paho.mqtt.c-master# make mkdir -p build/output/samples mkdir -p build/output/test echo OSTYPE is Linux OSTYPE is Linux sed -e "s/@CLIENT_VERSION@/1.3.0/g" -e "s/@BUILD_TIMESTAMP@/Thu Jun 19 06:23:05 PDT 2025/g" src/VersionInfo.h.in > build/VersionInfo.h arm-linux-gcc -g -fPIC -I/home/t101/sysdir/ssl/include/ -Os -Wall -Ibuild -o build/output/libpaho-mqtt3c.so.1.0 src/Heap.c src/Socket.c src/MQTTProtocolClient.c src/MQTTProtocolOut.c src/SHA1.c src/StackTrace.c src/MQTTProperties.c src/MQTTPersistenceDefault.c src/MQTTPacketOut.c src/WebSocket.c src/Clients.c src/OsWrapper.c src/MQTTPacket.c src/Base64.c src/MQTTClient.c src/Log.c src/Thread.c src/LinkedList.c src/MQTTReasonCodes.c src/MQTTPersistence.c src/utf-8.c src/SocketBuffer.c src/Tree.c src/Messages.c -L/home/t101/sysdir/ssl/lib -shared -Wl,-init,MQTTClient_init -lpthread -Wl,-soname,libpaho-mqtt3c.so.1 src/SHA1.c: In function `SHA1_ProcessBlock': src/SHA1.c:112: warning: implicit declaration of function `__builtin_bswap32' src/WebSocket.c: In function `WebSocket_buildFrame': src/WebSocket.c:225: warning: implicit declaration of function `__builtin_bswap16' src/WebSocket.c:230: warning: integer constant is too large for "long" type src/WebSocket.c:230: warning: comparison is always true due to limited range of data type src/WebSocket.c:232: warning: implicit declaration of function `__builtin_bswap64' src/WebSocket.c: In function `WebSocket_calculateFrameHeaderSize': src/WebSocket.c:297: warning: integer constant is too large for "long" type src/WebSocket.c:297: warning: comparison is always true due to limited range of data type ln -s libpaho-mqtt3c.so.1.0 build/output/libpaho-mqtt3c.so.1 ln -s libpaho-mqtt3c.so.1 build/output/libpaho-mqtt3c.so arm-linux-gcc -g -fPIC -I/home/t101/sysdir/ssl/include/ -Os -Wall -Ibuild -o build/output/libpaho-mqtt3cs.so.1.0 src/Heap.c src/Socket.c src/SSLSocket.c src/MQTTProtocolClient.c src/MQTTProtocolOut.c src/SHA1.c src/StackTrace.c src/MQTTProperties.c src/MQTTPersistenceDefault.c src/MQTTPacketOut.c src/WebSocket.c src/Clients.c src/OsWrapper.c src/MQTTPacket.c src/Base64.c src/MQTTClient.c src/Log.c src/Thread.c src/LinkedList.c src/MQTTReasonCodes.c src/MQTTPersistence.c src/utf-8.c src/SocketBuffer.c src/Tree.c src/Messages.c -DOPENSSL -L/home/t101/sysdir/ssl/lib -shared -Wl,--start-group -lpthread -ldl -lssl -lcrypto -Wl,--end-group -Wl,-init,MQTTClient_init -Wl,-soname,libpaho-mqtt3cs.so.1 -Wl,-no-whole-archive src/SSLSocket.c: In function `SSLSocket_createContext': src/SSLSocket.c:537: warning: `TLSv1_client_method' is deprecated (declared at /home/t101/sysdir/ssl/include/openssl/ssl.h:1866) src/SSLSocket.c:542: warning: `TLSv1_1_client_method' is deprecated (declared at /home/t101/sysdir/ssl/include/openssl/ssl.h:1872) src/SSLSocket.c:547: warning: `TLSv1_2_client_method' is deprecated (declared at /home/t101/sysdir/ssl/include/openssl/ssl.h:1878) src/SSLSocket.c: In function `SSLSocket_initialize': src/SSLSocket.c:476: warning: statement with no effect src/WebSocket.c: In function `WebSocket_buildFrame': src/WebSocket.c:225: warning: implicit declaration of function `__builtin_bswap16' src/WebSocket.c:230: warning: integer constant is too large for "long" type src/WebSocket.c:230: warning: comparison is always true due to limited range of data type src/WebSocket.c:232: warning: implicit declaration of function `__builtin_bswap64' src/WebSocket.c: In function `WebSocket_calculateFrameHeaderSize': src/WebSocket.c:297: warning: integer constant is too large for "long" type src/WebSocket.c:297: warning: comparison is always true due to limited range of data type ln -s libpaho-mqtt3cs.so.1.0 build/output/libpaho-mqtt3cs.so.1 ln -s libpaho-mqtt3cs.so.1 build/output/libpaho-mqtt3cs.so arm-linux-gcc -g -fPIC -I/home/t101/sysdir/ssl/include/ -Os -Wall -Ibuild -o build/output/libpaho-mqtt3a.so.1.0 src/Heap.c src/Socket.c src/MQTTProtocolClient.c src/MQTTProtocolOut.c src/MQTTAsync.c src/SHA1.c src/StackTrace.c src/MQTTProperties.c src/MQTTPersistenceDefault.c src/MQTTPacketOut.c src/WebSocket.c src/Clients.c src/OsWrapper.c src/MQTTPacket.c src/Base64.c src/Log.c src/Thread.c src/LinkedList.c src/MQTTReasonCodes.c src/MQTTPersistence.c src/utf-8.c src/SocketBuffer.c src/Tree.c src/Messages.c -L/home/t101/sysdir/ssl/lib -shared -Wl,-init,MQTTAsync_init -lpthread -Wl,-soname,libpaho-mqtt3a.so.1 src/SHA1.c: In function `SHA1_ProcessBlock': src/SHA1.c:112: warning: implicit declaration of function `__builtin_bswap32' src/WebSocket.c: In function `WebSocket_buildFrame': src/WebSocket.c:225: warning: implicit declaration of function `__builtin_bswap16' src/WebSocket.c:230: warning: integer constant is too large for "long" type src/WebSocket.c:230: warning: comparison is always true due to limited range of data type src/WebSocket.c:232: warning: implicit declaration of function `__builtin_bswap64' src/WebSocket.c: In function `WebSocket_calculateFrameHeaderSize': src/WebSocket.c:297: warning: integer constant is too large for "long" type src/WebSocket.c:297: warning: comparison is always true due to limited range of data type ln -s libpaho-mqtt3a.so.1.0 build/output/libpaho-mqtt3a.so.1 ln -s libpaho-mqtt3a.so.1 build/output/libpaho-mqtt3a.so arm-linux-gcc -g -fPIC -I/home/t101/sysdir/ssl/include/ -Os -Wall -Ibuild -o build/output/libpaho-mqtt3as.so.1.0 src/Heap.c src/Socket.c src/SSLSocket.c src/MQTTProtocolClient.c src/MQTTProtocolOut.c src/MQTTAsync.c src/SHA1.c src/StackTrace.c src/MQTTProperties.c src/MQTTPersistenceDefault.c src/MQTTPacketOut.c src/WebSocket.c src/Clients.c src/OsWrapper.c src/MQTTPacket.c src/Base64.c src/Log.c src/Thread.c src/LinkedList.c src/MQTTReasonCodes.c src/MQTTPersistence.c src/utf-8.c src/SocketBuffer.c src/Tree.c src/Messages.c -DOPENSSL -L/home/t101/sysdir/ssl/lib -shared -Wl,--start-group -lpthread -ldl -lssl -lcrypto -Wl,--end-group -Wl,-init,MQTTAsync_init -Wl,-soname,libpaho-mqtt3as.so.1 -Wl,-no-whole-archive src/SSLSocket.c: In function `SSLSocket_createContext': src/SSLSocket.c:537: warning: `TLSv1_client_method' is deprecated (declared at /home/t101/sysdir/ssl/include/openssl/ssl.h:1866) src/SSLSocket.c:542: warning: `TLSv1_1_client_method' is deprecated (declared at /home/t101/sysdir/ssl/include/openssl/ssl.h:1872) src/SSLSocket.c:547: warning: `TLSv1_2_client_method' is deprecated (declared at /home/t101/sysdir/ssl/include/openssl/ssl.h:1878) src/SSLSocket.c: In function `SSLSocket_initialize': src/SSLSocket.c:476: warning: statement with no effect src/WebSocket.c: In function `WebSocket_buildFrame': src/WebSocket.c:225: warning: implicit declaration of function `__builtin_bswap16' src/WebSocket.c:230: warning: integer constant is too large for "long" type src/WebSocket.c:230: warning: comparison is always true due to limited range of data type src/WebSocket.c:232: warning: implicit declaration of function `__builtin_bswap64' src/WebSocket.c: In function `WebSocket_calculateFrameHeaderSize': src/WebSocket.c:297: warning: integer constant is too large for "long" type src/WebSocket.c:297: warning: comparison is always true due to limited range of data type ln -s libpaho-mqtt3as.so.1.0 build/output/libpaho-mqtt3as.so.1 ln -s libpaho-mqtt3as.so.1 build/output/libpaho-mqtt3as.so arm-linux-gcc -L/home/t101/sysdir/ssl/lib -I src -lpthread -L build/output -o build/output/paho_c_version -lpaho-mqtt3a src/MQTTVersion.c -ldl build/output/libpaho-mqtt3a.so: undefined reference to `clock_gettime' build/output/libpaho-mqtt3a.so: undefined reference to `__builtin_bswap16' build/output/libpaho-mqtt3a.so: undefined reference to `__builtin_bswap32' build/output/libpaho-mqtt3a.so: undefined reference to `__builtin_bswap64' collect2: ld returned 1 exit status Makefile:274: recipe for target 'build/output/paho_c_version' failed make: *** [build/output/paho_c_version] Error 1
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这个错误是因为在打印时使用了单引号。
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只需要把 cout<<‘解决了’中的单引号，改成双引号就可以了
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