How Install CGAL 6.0 in windows

[DarkSun812]

I am installing CGAL 6.0 for windows and running a sample code that is in the official documentation, but it does not run as I get the following error

===== Error 1 =====

Severity Code Description Project Project File Line Status suppressed Details
Error LNK2019 unresolved external symbol __imp___gmpz_clear referenced in function “public: __cdecl boost::multiprecision::backends::gmp_int::~gmp_int(void)” (??1gmp_int@backends@multiprecision@boost@@QEAA@XZ) CGAL TEST C:\Users\baezaezaezaezaeource\reposseCGAL TEST\CGAL TEST.obj 1	

**==============

Steps I used to install CGAL 6.0:

• I am using visual studio 2022, I downloaded the source “CGAL-6.0-library.zip” and “GMP and MPFR libraries, for Windows 64bits ‘which is available at the following official link: ’https://github.com/CGAL/cgal/releases” (Note that there is only one gmp folder, I didn't see any that said MPFR).
• grab the “auxiliary” folder from the gmp file and paste it inside the CGAL-6.0-library folder
• Then in the “C:\dev\CGAL-6.0” directory I pasted that folder.
• I have installed boost_1_86_0 in the “C:\boost_1_86_0” directory.

In the C++ directory inclusion files I have the following:

C:\dev\CGAL-6.0\include;C:\dev\CGAL-6.0\auxiliary\gmp\include;C:\boost_1_86_0;%(AdditionalIncludeDirectories)

In the linking files:
C:\dev\CGAL-6.0\lib;C:\dev\CGAL-6.0\auxiliary\gmp\lib;C:\boost_1_86_0\libs;C:\dev\CGAL-6.0\lib\cmake\CGAL;%(AdditionalLibraryDirectories)

I have added lib 2 times because I didn't know if I made a mistake so I added it just in case but it keeps giving the same error.

For the record, I read the documentation and tried to follow the installation steps but in the end that's what happened...

I tried to use vcpkg but it gets stuck when it starts downloading a gmp dependency I am using windows 11, you should check because that method didn't work for me.

The code I am trying to execute is as follows:

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Projection_traits_xy_3.h>
#include <CGAL/Delaunay_triangulation_2.h>

#include <fstream>


typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Projection_traits_xy_3<K>  Gt;
typedef CGAL::Delaunay_triangulation_2<Gt> Delaunay;

typedef K::Point_3   Point;

int main()
{
	std::ifstream in("data/terrain.cin");
	std::istream_iterator<Point> begin(in);
	std::istream_iterator<Point> end;

	Delaunay dt(begin, end);
	std::cout << dt.number_of_vertices() << std::endl;
	return 0;
}

[sloriot]

You need to link with GMP. I guess you did not use cmake otherwise it would have been automatically added.

[sloriot]

you only provided the path, you also need to provide the libs.
What is the problem with cmake? did you pick visual studio as generator?

[DarkSun812]

Excuse my ignorance, but by including the path of C:\dev\CGAL-6.0\auxiliary\gmp\lib in the visual studio library linker, wouldn't it be adding the libraries?

The problem that have with cmake is the next...

C:\dev\CGAL-6.0>cd build

C:\dev\CGAL-6.0\build>cmake ..
-- Building for: Visual Studio 17 2022
-- Selecting Windows SDK version 10.0.22621.0 to target Windows 10.0.22631.
-- The CXX compiler identification is MSVC 19.41.34120.0
-- The C compiler identification is MSVC 19.41.34120.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.41.34120/bin/Hostx64/x64/cl.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.41.34120/bin/Hostx64/x64/cl.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Build CGAL from release in directory CGAL-6.0
-- Packagenames: CGAL-6.0
== Setting paths (DONE) ==

== Generate version files ==
-- CGAL_MAJOR_VERSION=6
-- CGAL_MINOR_VERSION=0
-- CGAL_BUGFIX_VERSION=0
-- Visual Leak Detector (VLD) is not found.
-- Targeting Visual Studio 17 2022
-- Target build environment supports auto-linking
-- Using VC toolset 143.
-- Generator uses intermediate configuration directory: $(Configuration)
-- USING CMake version: 3.23.0
-- System: Windows
== Generate version files (DONE) ==

-- Multi-configuration CMake generator: cannot display flags
== Detect external libraries ==
== Detect external libraries (DONE) ==

== Generating build files ==
== Generating build files (DONE) ==

== Setting paths ==
-- Configuring done
-- Generating done
-- Build files have been written to: C:/dev/CGAL-6.0/build

C:\dev\CGAL-6.0\build>nmake

Microsoft Program Maintenance Utility (R) version 14.41.34120.0
(C) Microsoft Corporation. All rights reserved.Microsoft Program Maintenance Utility (R) version 14.41.34120.0
(C) Microsoft Corporation. All rights reserved.

NMAKE : fatal error U1064: no MAKE file found and no destination specified.
Stop.

And I don't know how to continue

[sloriot]

It should have generated a .sln file you can open with visual studio.

Adding a path does not a library. One directory might contains thousands of libraries.

[DarkSun812]

I tried to compile a sample project, but it does not recognize the QT6 installation, I will upload pictures of the results I get when I press the configure button.

I include the path to the bin folder but when I configure it says that the folder is not found.
I also added the environment variables that according to the documentation are necessary.

Although I include the route, when I click on the configure button, it changes to the message that shows the first image.

[DarkSun812]

In the folder I put in the path are these files, the ones it says it supposedly can't find

[ankofl]

I have the following task today: can I will give up using gmp-10.dll and mfpr-6.dll for moving on to Boost.Multiprecision?

To the list of changes:

GMP/MPFR are no longer mandatory to use CGAL, Boost.Multiprecision. can be used instead.

The CGAL Core library is no longer based on GMP, but on Boost.Multiprecision. Either GMP backend or Boost backend can be used.

And how could I do that?

P.S. In fact, the problem is that it is not very convenient for me to carry along with my dll and exe files gmp-10.dll and mpfr-6.dll I would like to get rid of this by using Boost.Multiprecision

[sloriot]

If you a recent enough boost version, simply do not provide gmp to cmake and boost multiprecision will be used by defaut. Otherwise, you can change the cmake variable CGAL_CMAKE_EXACT_NT_BACKEND to BOOST_BACKEND (by hand or using the drop-down menu in your cmake gui)

[ankofl]

Thank you very much!