so how should I complie your example?
and for the following code:
> #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.
Thanks
Stefano Gragnani
> Il giorno 21 lug 2021, alle ore 17:56, Stefano Gragnani
> <stefano.gragn...@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 <mailto: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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