This fixes a build failure on Windows which lacks <langinfo.h>.
(We can't use the more portable localeconv() from <clocale> to obtain
the radix character of the current locale here because it's not
thread-safe, unfortunately.)
This change means that on Windows and other such systems, we'll just
always assume the radix character used by printf is '.' when formatting
a long double through it.
libstdc++-v3/ChangeLog:
PR libstdc++/98374
* src/c++17/floating_to_chars.cc: Guard include of <langinfo.h>
with __has_include.
(__floating_to_chars_precision) [!defined(RADIXCHAR)]: Don't
attempt to obtain the radix character of the current locale,
just assume it's '.'.
---
libstdc++-v3/src/c++17/floating_to_chars.cc | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/src/c++17/floating_to_chars.cc
b/libstdc++-v3/src/c++17/floating_to_chars.cc
index 474e791e717..6470fbb0b95 100644
--- a/libstdc++-v3/src/c++17/floating_to_chars.cc
+++ b/libstdc++-v3/src/c++17/floating_to_chars.cc
@@ -33,7 +33,9 @@
#include <cmath>
#include <cstdio>
#include <cstring>
-#include <langinfo.h>
+#if __has_include(<langinfo.h>)
+# include <langinfo.h> // for nl_langinfo
+#endif
#include <optional>
#include <string_view>
#include <type_traits>
@@ -1113,6 +1115,7 @@ template<typename T>
// to handle a radix point that's different from '.'.
char radix[6] = {'.', '\0', '\0', '\0', '\0', '\0'};
if (effective_precision > 0)
+#ifdef RADIXCHAR
// ???: Can nl_langinfo() ever return null?
if (const char* const radix_ptr = nl_langinfo(RADIXCHAR))
{
@@ -1121,6 +1124,7 @@ template<typename T>
// UTF-8 character) wide.
__glibcxx_assert(radix[4] == '\0');
}
+#endif
// Compute straightforward upper bounds on the output length.
int output_length_upper_bound;
--
2.30.0.rc0
