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How to solve the problems of FLTK in Code::Blocks

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hrz:
I am read the book:Programming principles and practice using C++. And now, I am learning to use GUI library. I've downloaded the FLTK and compiled it.I've built a simple FLTK project to test and it worked.But when I inputed the example codes and downloaded all the GUI files in www.stroustrup.com and included them,they were failed to compiled.
The basic message are:
1. OS:windows 10,
2. Code::Blocks version:17.12,
3.FLTK version: 1.3.5,
The compile message are:
1.cmath:1094:11: error: '::hypot' has not been declared
   using ::hypot;
           ^
2.gcc/mingw32/5.1.0/include/c++/bits/locale_facets_nonio.h:1971:5: error: template-id 'do_get<>' for 'String std::__cxx11::messages<char>::do_get(std::messages_base::catalog, int, int, const String&) const' does not match any template declaration
     messages<char>::do_get(catalog, int, int, const string&) const;
3.Window.h:25:18: error: expected ')' before 'xy'
     Window(Point xy, int w, int h, const string& title);
4.Point.h:33:18: error: expected ')' before 'xy'
5.Point.h:98:5: error: 'Vector_ref' does not name a type
     Vector_ref<Button> selection;
.................

Process terminated with status 1 (0 minute(s), 2 second(s))
50 error(s), 30 warning(s) (0 minute(s), 2 second(s))

why the <cmath> should be error?
why "Point.h" is error?
I don't know how to solve these problems, anyone could help me?
Thanks!!!

oBFusCATed:
If you're using GCC 5.1 it is probably too old to have support for this function. Are you using c++11 mode?

hrz:
Yes! my gcc version is 5.1. I've updated to 8.1 now. The errors of <cmath> disapear. but it still fail.
Errors like this:
1.MinGW\include/winnt.h:2399:2: error: #error "undefined processor type"
#error "undefined processor type"
  ^~~~~

2.include/crtdefs.h:35:1: error: '__MINGW_EXTENSION' does not name a type; did you mean 'FL_MINOR_VERSION'
__MINGW_EXTENSION typedef unsigned __int64 size_t;
 ^~~~~~~~~~~~~~~~~
3.include/crtdefs.h:138:9: error: '__time64_t' does not name a type; did you mean '__time32_t'?
 typedef __time64_t time_t;
         ^~~~~~~~~~
4.include/stdlib.h:348:58: error: 'size_t' has not been declared
 _CRTIMP int __cdecl __MINGW_NOTHROW mblen  (const char*, size_t);
                                                          ^~~~~~
5.include/stdlib.h:356:47: error: 'size_t' was not declared in this scope
_CRTIMP void* __cdecl __MINGW_NOTHROW malloc (size_t) __MINGW_ATTRIB_MALLOC;
                                               ^~~~~~
............
Process terminated with status 1 (0 minute(s), 10 second(s))
50 error(s), 2 warning(s) (0 minute(s), 10 second(s))

It still have 50 errors,but this time isn't  the <cmath>.

Thank you very much!!!

hrz:

--- Quote from: oBFusCATed on June 18, 2021, 09:48:16 am ---If you're using GCC 5.1 it is probably too old to have support for this function. Are you using c++11 mode?

--- End quote ---

Miguel Gimenez:
Did you remove 5.1 version completely?

Post a full rebuild log, read this

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