lexical_cast in boost 1.76.0 no longer compiles with pre-c++11 setup #49
Description
I'm using old ARMCC 4.1 compiler with vendor provided standard C++ library :(
My cmath / math.h do not have C++11/C99 floating point functions.
I did not see any mention about requiring C++11 now or before
"C:\devtools\boost\boost/core/cmath.hpp", line 141: Error: #135: namespace "std" has no member "isfinite"
using std::isfinite;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 142: Error: #135: namespace "std" has no member "isnan"
using std::isnan;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 143: Error: #135: namespace "std" has no member "isinf"
using std::isinf;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 144: Error: #135: namespace "std" has no member "isnormal"
using std::isnormal;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 145: Error: #135: namespace "std" has no member "fpclassify"
using std::fpclassify;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 147: Error: #20: identifier "FP_ZERO" is undefined
int const fp_zero = FP_ZERO;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 148: Error: #20: identifier "FP_SUBNORMAL" is undefined
int const fp_subnormal = FP_SUBNORMAL;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 149: Error: #20: identifier "FP_NORMAL" is undefined
int const fp_normal = FP_NORMAL;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 150: Error: #20: identifier "FP_INFINITE" is undefined
int const fp_infinite = FP_INFINITE;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 151: Error: #20: identifier "FP_NAN" is undefined
int const fp_nan = FP_NAN;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 153: Error: #135: namespace "std" has no member "signbit"
using std::signbit;
^
"C:\devtools\boost\boost/core/cmath.hpp", line 161: Error: #135: namespace "std" has no member "copysign"
return std::copysign( x, y );
^
"C:\devtools\boost\boost/lexical_cast/detail/inf_nan.hpp", line 108: Error: #135: namespace "boost::core" has no member "isnan"
if (boost::core::isnan(value)) {
^
"C:\devtools\boost\boost/lexical_cast/detail/inf_nan.hpp", line 109: Error: #135: namespace "boost::core" has no member "signbit"
if (boost::core::signbit(value)) {
^
"C:\devtools\boost\boost/lexical_cast/detail/inf_nan.hpp", line 117: Error: #135: namespace "boost::core" has no member "isinf"
} else if (boost::core::isinf(value)) {
^
"C:\devtools\boost\boost/lexical_cast/detail/inf_nan.hpp", line 118: Error: #135: namespace "boost::core" has no member "signbit"
if (boost::core::signbit(value)) {
^