Il giorno 21 lug 2021, alle ore 17:56, Stefano Gragnani <stefano.gragnani@gmail.com> ha scritto:

ok things are better but i still get errors:

> Executing task: g++-11 -g -I/usr/local/Cellar/boost/1.76.0/include/ -I/usr/local/include/ -L/usr/local/Cellar/boost/1.76.0/lib/ -L/usr/local/Cellar/gcc/11.1.0_1/lib/gcc/11/ -L/usr/local/Cellar/gmp/6.2.1/lib/ -L/usr/local/Cellar/mpfr/4.1.0/lib/ -std=gnu++20 -lmpfr -lgmp -lquadmath -lboost_system -lboost_filesystem '-fext-numeric-literals' float128_example.cpp -o main <

float128_example.cpp: In function 'int main()':

float128_example.cpp:186:20: error: call of overloaded 'exp(__float128)' is ambiguous

  186 |   float128 e1 = exp(1.Q); // Note argument to exp is type float128.

      |                 ~~~^~~~~

In file included from /usr/local/Cellar/gcc/11.1.0_1/include/c++/11.1.0/cmath:45,

                 from /usr/local/Cellar/boost/1.76.0/include/boost/config/no_tr1/cmath.hpp:21,

                 from /usr/local/Cellar/boost/1.76.0/include/boost/math/tools/config.hpp:19,

                 from /usr/local/Cellar/boost/1.76.0/include/boost/math/cstdfloat/cstdfloat_types.hpp:18,

                 from /usr/local/Cellar/boost/1.76.0/include/boost/cstdfloat.hpp:18,

                 from float128_example.cpp:19:

/usr/local/Cellar/gcc/11.1.0_1/lib/gcc/11/gcc/x86_64-apple-darwin20/11.1.0/include-fixed/math.h:376:15: note: candidate: 'double exp(double)'

  376 | extern double exp(double);

      |               ^~~

In file included from /usr/local/Cellar/boost/1.76.0/include/boost/config/no_tr1/cmath.hpp:21,

                 from /usr/local/Cellar/boost/1.76.0/include/boost/math/tools/config.hpp:19,

                 from /usr/local/Cellar/boost/1.76.0/include/boost/math/cstdfloat/cstdfloat_types.hpp:18,

                 from /usr/local/Cellar/boost/1.76.0/include/boost/cstdfloat.hpp:18,

                 from float128_example.cpp:19:

/usr/local/Cellar/gcc/11.1.0_1/include/c++/11.1.0/cmath:226:3: note: candidate: 'constexpr long double std::exp(long double)'

  226 |   exp(long double __x)

      |   ^~~

/usr/local/Cellar/gcc/11.1.0_1/include/c++/11.1.0/cmath:222:3: note: candidate: 'constexpr float std::exp(float)'

  222 |   exp(float __x)

      |   ^~~

The terminal process "zsh '-c', 'g++-11 -g -I/usr/local/Cellar/boost/1.76.0/include/ -I/usr/local/include/ -L/usr/local/Cellar/boost/1.76.0/lib/ -L/usr/local/Cellar/gcc/11.1.0_1/lib/gcc/11/ -L/usr/local/Cellar/gmp/6.2.1/lib/ -L/usr/local/Cellar/mpfr/4.1.0/lib/ -std=gnu++20 -lmpfr -lgmp -lquadmath -lboost_system -lboost_filesystem '-fext-numeric-literals' float128_example.cpp -o main'" terminated with exit code: 1.

Compiling the following example:

#include <iomanip>

#include <iostream>

#include <boost/multiprecision/cpp_int.hpp>

#include <boost/multiprecision/cpp_bin_float.hpp>

#include <boost/multiprecision/float128.hpp>

#include <boost/math/special_functions/gamma.hpp>

#include <boost/multiprecision/cpp_dec_float.hpp>

#include <boost/math/constants/constants.hpp>

int main()

{

using boost::multiprecision::float128;

float128 b = 2;

std::cout << std::numeric_limits<float128>::digits << std::endl;

std::cout << std::numeric_limits<float128>::digits10 << std::endl;

std::cout << std::setprecision(std::numeric_limits<float128>::max_digits10) << log(b) << std::endl;

constexpr float128 pi = 3.1415926535897932384626433832795028841971693993751058Q;

return 0;

}

I get:

> Executing task: g++-11 -g -I/usr/local/Cellar/boost/1.76.0/include/ -I/usr/local/include/ -L/usr/local/Cellar/boost/1.76.0/lib/ -L/usr/local/Cellar/gcc/11.1.0_1/lib/gcc/11/ -L/usr/local/Cellar/gmp/6.2.1/lib/ -L/usr/local/Cellar/mpfr/4.1.0/lib/ -std=gnu++20 -lmpfr -lgmp -lquadmath -lboost_system -lboost_filesystem '-fext-numeric-literals' fs_main.cpp -o main <

Undefined symbols for architecture x86_64:

  "__Z17quadmath_snprintfPcmPKcz", referenced from:

      __ZNK5boost14multiprecision8backends16float128_backend3strB5cxx11ElSt13_Ios_Fmtflags in ccGxvsSR.o

  "__Z4logqg", referenced from:

      __ZN5boost14multiprecision8backends8eval_logERNS1_16float128_backendERKS2_ in ccGxvsSR.o

ld: symbol(s) not found for architecture x86_64

collect2: error: ld returned 1 exit status

The terminal process "zsh '-c', 'g++-11 -g -I/usr/local/Cellar/boost/1.76.0/include/ -I/usr/local/include/ -L/usr/local/Cellar/boost/1.76.0/lib/ -L/usr/local/Cellar/gcc/11.1.0_1/lib/gcc/11/ -L/usr/local/Cellar/gmp/6.2.1/lib/ -L/usr/local/Cellar/mpfr/4.1.0/lib/ -std=gnu++20 -lmpfr -lgmp -lquadmath -lboost_system -lboost_filesystem '-fext-numeric-literals' fs_main.cpp -o main'" terminated with exit code: 1.

Note that if I compile the following example without using Boost I have no linking errors with quadmath:

#include <quadmath.h>

#include <iostream>

#include <stdlib.h>

#include <stdio.h>

int print(const char *label, __float128 r) {

int prec = 20;

int width = 46;

char buf[128];

int n = quadmath_snprintf(buf, sizeof buf, "%+-#*.36Qe", width, r);

printf ("%s: %s\n", label, buf);

return 0;

}

int main () {

__float128 x = 3.14159265358979323846264338327950288q;

print("value", x);

print("log", logq(x));

print("log10", log10q(x));

print("cos", cosq(x));

print("sin", sinq(x));

print("sqrt", sqrtq(x));

}

Executing task: ./es1.out <

value: +3.141592653589793238462643383279502797e+00   

log: +1.144729885849400174143427351353058656e+00   

log10: +4.971498726941338543512682882908988723e-01   

cos: -1.000000000000000000000000000000000000e+00   

sin: +8.671810130123781024797044026043352254e-35   

sqrt: +1.772453850905516027298167483341145140e+00

The settings are:

"tasks": [

{

"label": "Build with g++ 11",

"type": "shell",

"command": "g++-11",

"args": [

"-g",

"-std=gnu++20”,

"es1.cpp",

"-L/usr/local/Cellar/gcc/11.1.0_1/lib/gcc/11/",

"-lquadmath",

"-o",

"es1.out"

],

"group": {

"kind": "build",

"isDefault": true

},

"problemMatcher": []

},

Il giorno 21 lug 2021, alle ore 13:08, John Maddock via Boost-users <boost-users@lists.boost.org> ha scritto:

On 20/07/2021 18:44, Stefano Gragnani via Boost-users wrote:

Hi,

I'm having trouble compiling code that contains float128 data type.
I'm using MacOS Big Sur 11.4.
Compiler: gcc version 11.1.0 (Homebrew GCC 11.1.0_1)

I have no other problems with Boost, the only problem is when I use float128.

Please note that I have no problem compiling using libquadmath without using Boost using the __float128 data type.

I use Visual Studio Code:

You can manually fix this by defining BOOST_HAS_FLOAT128 on the command line.  However, you may still hit other errors as __float128 and quadmath.h aren't really fully supported in ISO C++ mode.  The correct fix is to use -std=gnu++20, and then GNU extensions including __float128 are turned on.

HTH, John.


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