6a31d47e27
This patch conditionally disables the floating-point std::to_chars implementation on targets whose float and double aren't IEEE binary32 and binary64, until a proper fallback can be added for such targets. This fixes a bootstrap failure on non-IEEE-754 FP targets such as vax-netbsdelf. The new preprocessor tests in c++config that detect the binary32 and binary64 formats were copied from gcc/testsuite/gcc.dg/float-exact-1.c. libstdc++-v3/ChangeLog: * include/bits/c++config (_GLIBCXX_FLOAT_IS_IEEE_BINARY_32): Define this macro. (_GLIBCXX_DOUBLE_IS_IEEE_BINARY_64): Likewise. * include/std/charconv (to_chars): Use these macros to conditionally hide the overloads for floating-point types. * src/c++17/floating_to_chars.cc: Use the macros to conditionally disable this file. (floating_type_traits<float>): Remove redundant static assert. (floating_type_traits<double>): Likewise. * testsuite/20_util/to_chars/double.cc: Run this test only on ieee-floats effective targets. * testsuite/20_util/to_chars/float.cc: Likewise. * testsuite/20_util/to_chars/long_double.cc: Likewise. * testsuite/lib/libstdc++.exp (check_effective_target_ieee-floats): Define new proc for detecting whether float and double have the IEEE binary32 and binary64 formats. |
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| .. | ||
| backward | ||
| bits | ||
| c | ||
| c_compatibility | ||
| c_global | ||
| c_std | ||
| debug | ||
| decimal | ||
| experimental | ||
| ext | ||
| parallel | ||
| precompiled | ||
| pstl | ||
| std | ||
| tr1 | ||
| tr2 | ||
| Makefile.am | ||
| Makefile.in | ||