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所以，我最近重新安装了 Windows，目前正在尝试重新设置，所以我正在尝试重新编译一些在重新安装前工作的代码。我目前遇到的问题是，在编译时，我收到提示我没有标准库的错误：

g++ -c -Wall -g -v src/main.cpp -o src/main.o
Using built-in specs.
COLLECT_GCC=c:\MinGW\bin\g++.exe
Target: mingw32
Configured with: ../gcc-4.8.1/configure --prefix=/mingw --host=mingw32 --build=mingw32 --without-pic --enable-shared --enable-static --with-gnu-ld --enable-lto --enable-libssp --disable-multilib --enable-languages=c,c++,fortran,objc,obj-c++,ada --disable-sjlj-exceptions --with-dwarf2 --disable-win32-registry --enable-libstdcxx-debug --enable-version-specific-runtime-libs --with-gmp=/usr/src/pkg/gmp-5.1.2-1-mingw32-src/bld --with-mpc=/usr/src/pkg/mpc-1.0.1-1-mingw32-src/bld --with-mpfr= --with-system-zlib --with-gnu-as --enable-decimal-float=yes --enable-libgomp --enable-threads --with-libiconv-prefix=/mingw32 --with-libintl-prefix=/mingw
Thread model: win32
gcc version 4.8.1 (GCC) 
COLLECT_GCC_OPTIONS='-c' '-Wall' '-g' '-v' '-o' 'src/main.o' '-shared-libgcc' '-mtune=generic' '-march=pentiumpro'
 c:/mingw/bin/../libexec/gcc/mingw32/4.8.1/cc1plus.exe -quiet -v -iprefix c:\mingw\bin\../lib/gcc/mingw32/4.8.1/ src/main.cpp -quiet -dumpbase main.cpp -mtune=generic -march=pentiumpro -auxbase-strip src/main.o -g -Wall -version -o C:\Users\Maphrox\AppData\Local\Temp\ccS1atrn.s
GNU C++ (GCC) version 4.8.1 (mingw32)
    compiled by GNU C version 4.8.1, GMP version 5.1.2, MPFR version 3.1.2, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "c:\mingw\bin\../lib/gcc/mingw32/4.8.1/include/c++"
ignoring nonexistent directory "c:\mingw\bin\../lib/gcc/mingw32/4.8.1/include/c++/mingw32"
ignoring nonexistent directory "c:\mingw\bin\../lib/gcc/mingw32/4.8.1/include/c++/backward"
ignoring nonexistent directory "c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.8.1/include/c++"
ignoring nonexistent directory "c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.8.1/include/c++/mingw32"
ignoring nonexistent directory "c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.8.1/include/c++/backward"
ignoring duplicate directory "c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.8.1/include"
ignoring nonexistent directory "i:/p/giaw/mingw/include"
ignoring nonexistent directory "/mingw/include"
ignoring duplicate directory "c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.8.1/include-fixed"
ignoring duplicate directory "c:/mingw/lib/gcc/../../lib/gcc/mingw32/4.8.1/../../../../mingw32/include"
ignoring nonexistent directory "/mingw/include"
#include "..." search starts here:
#include <...> search starts here:
 c:\mingw\bin\../lib/gcc/mingw32/4.8.1/include
 c:\mingw\bin\../lib/gcc/mingw32/4.8.1/../../../../include
 c:\mingw\bin\../lib/gcc/mingw32/4.8.1/include-fixed
 c:\mingw\bin\../lib/gcc/mingw32/4.8.1/../../../../mingw32/include
End of search list.
GNU C++ (GCC) version 4.8.1 (mingw32)
    compiled by GNU C version 4.8.1, GMP version 5.1.2, MPFR version 3.1.2, MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: e3b01b00b6cf2cc1dc95350e55dafc7d
In file included from c:\mingw\include\glm\glm.hpp:78:0,
                 from src/main.cpp:3:
c:\mingw\include\glm\core/_fixes.hpp:29:17: fatal error: cmath: No such file or directory
 #include <cmath>
                 ^
compilation terminated.

知道如何解决这个问题吗？我很确定问题的原因是重新安装 Windows。

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