[newlib-cygwin] stdlib: conditionalize locale usage

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=bc0e8a996110550f65cd356d7da0ba1b5beb243e

commit bc0e8a996110550f65cd356d7da0ba1b5beb243e
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Mon Aug 23 09:56:22 2021 +0200

    stdlib: conditionalize locale usage
    
    _strtod_l as well as the gethex function both fetch the decimal point
    from the current LC_NUMERIC locale info.  This pulls in _C_numeric_locale
    unconditionally even on targets not supporting locales at all.
    
    Another problem is that strtod.c and gdtoa-gethex.c are ELIX 1, while
    locale information in general isn't.  This leads to potential build
    breakage on bare metal targets.
    
    Fix this by setting the decimal point to "." on all targets not
    defining __HAVE_LOCALE_INFO__.
    
    While at it, const'ify the entire local decimal point info in the
    affected functions.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 newlib/libc/stdlib/gdtoa-gethex.c | 12 +++++++++---
 newlib/libc/stdlib/strtod.c       |  7 ++++++-
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/newlib/libc/stdlib/gdtoa-gethex.c b/newlib/libc/stdlib/gdtoa-gethex.c
index 1d3da2889..74f30e690 100644
--- a/newlib/libc/stdlib/gdtoa-gethex.c
+++ b/newlib/libc/stdlib/gdtoa-gethex.c
@@ -149,10 +149,16 @@ gethex (struct _reent *ptr, const char **sp, const FPI *fpi,
 	int esign, havedig, irv, k, n, nbits, up, zret;
 	__ULong L, lostbits, *x;
 	Long e, e1;
-	const unsigned char *decimalpoint = (unsigned char *)
+#ifdef __HAVE_LOCALE_INFO__
+	const unsigned char *decimalpoint = (const unsigned char *)
 				      __get_numeric_locale(loc)->decimal_point;
-	size_t decp_len = strlen ((const char *) decimalpoint);
-	unsigned char decp_end = decimalpoint[decp_len - 1];
+	const size_t decp_len = strlen ((const char *) decimalpoint);
+	const unsigned char decp_end = decimalpoint[decp_len - 1];
+#else
+	const unsigned char *decimalpoint = (const unsigned char *) ".";
+	const size_t decp_len = 1;
+	const unsigned char decp_end = (unsigned char) '.';
+#endif
 
 	havedig = 0;
 	s0 = *(const unsigned char **)sp + 2;
diff --git a/newlib/libc/stdlib/strtod.c b/newlib/libc/stdlib/strtod.c
index 019416ca7..cd0222481 100644
--- a/newlib/libc/stdlib/strtod.c
+++ b/newlib/libc/stdlib/strtod.c
@@ -263,8 +263,13 @@ _strtod_l (struct _reent *ptr, const char *__restrict s00, char **__restrict se,
 #ifdef Honor_FLT_ROUNDS
 	int rounding;
 #endif
+#ifdef __HAVE_LOCALE_INFO__
 	const char *decimal_point = __get_numeric_locale(loc)->decimal_point;
-	int dec_len = strlen (decimal_point);
+	const int dec_len = strlen (decimal_point);
+#else
+	const char *decimal_point = ".";
+	const int dec_len = 1;
+#endif
 
 	delta = bs = bd = NULL;
 	sign = nz0 = nz = decpt = 0;