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View Compilation Error

0_0_34674815_31480.cpp: In function 'int main()':
0_0_34674815_31480.cpp:12:33: error: call of overloaded 'abs(float)' is ambiguous
   float a = sqrt(pow(abs(x1 - x2), 2) + pow(abs(y1 - y2), 2));
                                 ^
0_0_34674815_31480.cpp:12:33: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:72:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/string_conversions.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2850,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_34674815_31480.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:329:15: note: int abs(int)
   int __cdecl abs(int _X);
               ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/string_conversions.h:41:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2850,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_34674815_31480.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:174:3: note: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:166:3: note: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^
0_0_34674815_31480.cpp:12:56: error: call of overloaded 'abs(float)' is ambiguous
   float a = sqrt(pow(abs(x1 - x2), 2) + pow(abs(y1 - y2), 2));
                                                        ^
0_0_34674815_31480.cpp:12:56: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:72:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/string_conversions.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2850,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_34674815_31480.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:329:15: note: int abs(int)
   int __cdecl abs(int _X);
               ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/string_conversions.h:41:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2850,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_34674815_31480.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:174:3: note: long long int std::abs(long long int)
   abs(long long __x) { return __builtin_llabs (__x); }
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:166:3: note: long int std::abs(long int)
   abs(long __i) { return __builtin_labs(__i); }
   ^


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