“‘strcmp”未在此范围内声明
“‘strcmp”未在此范围内声明
提问于 2012-02-23 06:15:36
我正在用这个tutorial构建ios工具链。当我运行命令make ENABLE_OPTIMIZED=1时，我得到以下输出。
llvm[0]: Reconfiguring with /home/connor/llvm-svn/configure
config.status: creating Makefile.config
config.status: creating llvm.spec
config.status: creating docs/doxygen.cfg
config.status: creating tools/llvm-config/llvm-config.in
config.status: creating include/llvm/Config/config.h
config.status: creating include/llvm/Support/DataTypes.h
config.status: include/llvm/Support/DataTypes.h is unchanged
config.status: creating include/llvm/ADT/hash_map
config.status: include/llvm/ADT/hash_map is unchanged
config.status: creating include/llvm/ADT/hash_set
config.status: include/llvm/ADT/hash_set is unchanged
config.status: creating include/llvm/ADT/iterator
config.status: include/llvm/ADT/iterator is unchanged
config.status: executing setup commands
config.status: executing Makefile commands
config.status: executing Makefile.common commands
config.status: executing examples/Makefile commands
config.status: executing lib/Makefile commands
config.status: executing runtime/Makefile commands
config.status: executing test/Makefile commands
config.status: executing test/Makefile.tests commands
config.status: executing tools/Makefile commands
config.status: executing utils/Makefile commands
config.status: executing projects/Makefile commands
config.status: executing bindings/Makefile commands
config.status: executing bindings/ocaml/Makefile.ocaml commands
make[1]: Entering directory `/home/connor/llvm-svn/lib/System'
llvm[1]: Compiling Alarm.cpp for Release build
llvm[1]: Compiling Disassembler.cpp for Release build
Disassembler.cpp: In function ‘std::string llvm::sys::disassembleBuffer(uint8_t*, size_t, uint64_t)’:
Disassembler.cpp:44:12: warning: variable ‘bits’ set but not used [-Wunused-but-set-variable]
llvm[1]: Compiling DynamicLibrary.cpp for Release build
DynamicLibrary.cpp: In static member function ‘static void* llvm::sys::DynamicLibrary::SearchForAddressOfSymbol(const char*)’:
DynamicLibrary.cpp:178:5: error: ‘strcmp’ was not declared in this scope
DynamicLibrary.cpp:178:5: error: ‘stderr’ was not declared in this scope
DynamicLibrary.cpp:179:5: error: ‘strcmp’ was not declared in this scope
DynamicLibrary.cpp:179:5: error: ‘stdout’ was not declared in this scope
DynamicLibrary.cpp:180:5: error: ‘strcmp’ was not declared in this scope
DynamicLibrary.cpp:180:5: error: ‘stdin’ was not declared in this scope
make[1]: *** [/home/connor/llvm-svn/lib/System/Release/DynamicLibrary.o] Error 1
make[1]: Leaving directory `/home/connor/llvm-svn/lib/System'
make: *** [all] Error 1我不知道这是怎么回事，我的谷歌搜索也没有多大帮助。
回答 2
Stack Overflow用户
回答已采纳
发布于 2012-02-23 06:36:48
strcmp函数在string.h中声明。h尝试将
#include <string.h> 在DynamicLibrary.cpp中定义了stderr，而在stdio.h中定义了stderr
#include <stdio.h>时不时地，我也会发现缺少头文件的开源代码。
更新
如果您有不同名称，可以搜索包含目录，
在真实的GNU/Linux bash中(应该也可以与Windows10WSL一起使用)，您可以使用以下代码来搜索函数：
find /usr/include -type f | xargs grep ' strcmp\s*\('变量是这样的：
find /usr/include -type f | xargs grep '[\s*]stdin\s*;'在Windows上的Git Bash上有/include和/mingw64/include目录，但在我的安装上只有ImageMagick头文件和/mingw64/include/gnumake.h
Stack Overflow用户
发布于 2020-09-29 11:35:42
在C++中编码时也会发生同样的错误。在这种情况下，包括cstring库来解决错误。
#include<cstring>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/9403975
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