https://src.fedoraproject.org/rpms/bash/blob/bd5ac20b134f2936c54245fc83a8e70207d3e07e/f/bash-configure-c99-2.patch

Another C compatibility issue: char ** and char * are distinct types,
and strtold expects the former for its second argument.

Submitted upstream:

  <https://lists.gnu.org/archive/html/bug-bash/2023-11/msg00104.html>

--- configure.ac
+++ configure.ac
@@ -885,7 +885,7 @@ AC_CHECK_DECLS([strtold], [
 	[AC_COMPILE_IFELSE(
 		[AC_LANG_PROGRAM(
 		[[#include <stdlib.h>]],
-		[[long double r; char *foo, bar; r = strtold(foo, &bar);]]
+		[[long double r; char *foo, *bar; r = strtold(foo, &bar);]]
 	)],
 	[bash_cv_strtold_broken=no],[bash_cv_strtold_broken=yes])
         ]

--- configure
+++ configure
@@ -15676,7 +15676,7 @@ else $as_nop
 int
 main (void)
 {
-long double r; char *foo, bar; r = strtold(foo, &bar);
+long double r; char *foo, *bar; r = strtold(foo, &bar);
 
   ;
   return 0;