[glibc/release/2.39/master] sort-makefile-lines.py: Allow '_' in name and "^# name"

[Arjun Shankar]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9fe51d34bbce71d186e7adee74e523ccc64a9727

commit 9fe51d34bbce71d186e7adee74e523ccc64a9727
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Feb 15 03:22:55 2024 -0800

    sort-makefile-lines.py: Allow '_' in name and "^# name"
    
    '_' is used in Makefile variable names and many variables end with
    "^# name".  Relax sort-makefile-lines.py to allow '_' in name and
    "^# name" as variable end.  This fixes BZ #31385.
    
    (cherry picked from commit 6a2512bf1605a4208dd94ef67408488d8acb2409)

Diff:
---
 scripts/sort-makefile-lines.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/sort-makefile-lines.py b/scripts/sort-makefile-lines.py
index f65ee40e27..b2249aef6d 100755
--- a/scripts/sort-makefile-lines.py
+++ b/scripts/sort-makefile-lines.py
@@ -129,7 +129,7 @@ def sort_makefile_lines():
     for i in range(len(lines)):
         # Look for things like "var = \", "var := \" or "var += \"
         # to start the sorted list.
-        var = re.search(r'^([a-zA-Z0-9-]*) [\+:]?\= \\$', lines[i])
+        var = re.search(r'^([-_a-zA-Z0-9]*) [\+:]?\= \\$', lines[i])
         if var:
             # Remember the index and the name.
             startmarks.append((i, var.group(1)))
@@ -140,7 +140,7 @@ def sort_makefile_lines():
     rangemarks = []
     for sm in startmarks:
         # Look for things like "  # var" to end the sorted list.
-        reg = r'^  # ' + sm[1] + r'$'
+        reg = r'^ *# ' + sm[1] + r'$'
         for j in range(sm[0] + 1, len(lines)):
             if re.search(reg, lines[j]):
                 # Remember the block to sort (inclusive).