[gcc r12-5927] libstdc++: Add support for '?' in linker script globs

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:7bf710b5116e6186204edd6a0168202fd8ef0389

commit r12-5927-g7bf710b5116e6186204edd6a0168202fd8ef0389
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Dec 13 13:09:57 2021 +0000

    libstdc++: Add support for '?' in linker script globs
    
    The scripts/make_exports.pl script used for darwin only replaces '*'
    wildcards in globs, it doesn't handle '?'. This means the recent changes
    to std::__timepunct exports broke darwin.
    
    Rather than use mangled names in the linker script, this adds support
    for '?' to the perl script.
    
    This also removes some unnecessary escaping of the replacement strings
    in s// substitutions.
    
    libstdc++-v3/ChangeLog:
    
            * scripts/make_exports.pl: Replace '?' with '.' when turning
            a glob into a regex.

Diff:
---
 libstdc++-v3/scripts/make_exports.pl | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/scripts/make_exports.pl b/libstdc++-v3/scripts/make_exports.pl
index 93100e17ddf..7f4670f8a91 100644
--- a/libstdc++-v3/scripts/make_exports.pl
+++ b/libstdc++-v3/scripts/make_exports.pl
@@ -52,11 +52,13 @@ while (<F>) {
 	next;
     }
     # Catch globs.  Note that '{}' is not allowed in globs by this script,
-    # so only '*' and '[]' are available.
+    # so only '*' and '?' and '[]' are available.
     if (/^[ \t]*([^ \t;{}#]+);?[ \t]*$/) {
 	my $ptn = $1;
 	# Turn the glob into a regex by replacing '*' with '.*'.
-	$ptn =~ s/\*/\.\*/g;
+	$ptn =~ s/\*/.*/g;
+	# And replacing '?' with '.'.
+	$ptn =~ s/\?/./g;
 	push @$glob,$ptn;
 	next;
     }