我有一个导入cmath的简单C++程序。
#include <cmath>
int main() {
return 0;
}
我正在尝试使用以下命令编译它。
clang++ -o test main.cpp -std=c++14
但是，我得到以下错误
In file included from main.cpp:2:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:317:9: error:
no member named 'signbit' in the global namespace
using ::signbit;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:318:9: error:
no member named 'fpclassify' in the global namespace
using ::fpclassify;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:319:9: error:
no member named 'isfinite' in the global namespace; did you mean 'finite'?
using ::isfinite;
~~^
/usr/local/include/math.h:749:12: note: 'finite' declared here
extern int finite(double)
^
In file included from main.cpp:2:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:320:9: error:
no member named 'isinf' in the global namespace
using ::isinf;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:321:9: error:
no member named 'isnan' in the global namespace
using ::isnan;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:322:9: error:
no member named 'isnormal' in the global namespace
using ::isnormal;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:323:9: error:
no member named 'isgreater' in the global namespace
using ::isgreater;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:324:9: error:
no member named 'isgreaterequal' in the global namespace
using ::isgreaterequal;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:325:9: error:
no member named 'isless' in the global namespace
using ::isless;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:326:9: error:
no member named 'islessequal' in the global namespace
using ::islessequal;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:327:9: error:
no member named 'islessgreater' in the global namespace
using ::islessgreater;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:328:9: error:
no member named 'isunordered' in the global namespace
using ::isunordered;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:329:9: error:
no member named 'isunordered' in the global namespace
using ::isunordered;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:335:9: error:
no member named 'abs' in the global namespace; did you mean 'fabs'?
using ::abs;
~~^
/usr/local/include/math.h:417:15: note: 'fabs' declared here
extern double fabs(double);
^
In file included from main.cpp:2:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:640:26: error:
no template named 'numeric_limits'
bool _FloatBigger = (numeric_limits<_FloatT>::digits > numeric_limits<_IntT>::digits),
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:640:60: error:
no template named 'numeric_limits'
bool _FloatBigger = (numeric_limits<_FloatT>::digits > numeric_limits<_IntT>::digits),
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:641:18: error:
no template named 'numeric_limits'
int _Bits = (numeric_limits<_IntT>::digits - numeric_limits<_FloatT>::digits)>
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:641:50: error:
no template named 'numeric_limits'
int _Bits = (numeric_limits<_IntT>::digits - numeric_limits<_FloatT>::digits)>
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cmath:646:17: error:
no template named 'numeric_limits'
static_assert(numeric_limits<_FloatT>::radix == 2, "FloatT has incorrect radix");
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
这是我的系统规范。
macOS Catalina 10.15.2版
Apple clang 11.0.3版(clang-1103.0.32.29(
Xcode版本11.4(11E146((不确定这是否重要(
感谢您的帮助！
编辑：更新到macOS 10.15.4和Xcode 11.4.1，仍然有相同的问题
我相信这在Catalina C++中得到了答案：使用<cmath>headers产生错误：没有名为'；signbit'；在全局命名空间中
最简单的解决方案似乎是卸载在Catalina上运行的命令行工具，但我在High Sierra上遇到了这个问题，在那里我不得不编辑/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cmath
注释掉#include <math.h>并将其替换为：
#include</Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/math.h>
我必须这样做才能让自制软件的Rust(rustc-1.53.0(在High Sierra上编译。可能更好的方法是告诉cmake:
set(CMAKE_OSX_SYSROOT /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk)
因为处理系统提供的头通常不是一个好主意。