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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>
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