[Bug ld/30590] New: Section matching broken by prefix tree change (b1eecf6f66a4a642)

[andrewoates at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30590

            Bug ID: 30590
           Summary: Section matching broken by prefix tree change
                    (b1eecf6f66a4a642)
           Product: binutils
           Version: 2.40
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: andrewoates at gmail dot com
  Target Milestone: ---

I have a basic linker script that stopped working after upgrading to
binutils 2.40.  I did a git bisect on the repository and it seems that
the breakage starts with commit
b1eecf6f66a4a642f4cb35688213e6c1c1ffdc79.

My simplified test case is as follows:

#####
$ cat test1.c
int func3(void);

int func1(void) { return func3(); }

$ cat test2.c
int func1(void);

int func2(void) { return func1(); }

$ (127) cat test3.c
int func3(void) { return 0; }

$ cat linker.ld
ENTRY (func2)

SECTIONS
{
  . = 0x1000;
  .init-text ALIGN(4) :
  {
    lib1.a(*)
  }

  . = 0xc0000000;

  .text ALIGN(4) :
  {
    *(.text)
  }
}
####

If you then run
$ ${LD} --version
GNU ld (GNU Binutils) 2.39.50.20221130
Copyright (C) 2022 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.
$ ar cr lib1.a test1.o test2.o
$ ar cr lib2.a test3.o
$ ${LD} -o out.bin -T linker.ld lib1.a lib2.a
$ objdump -x out.bin | grep func
c000001e g     F .text  0000000a func3
c000000f g     F .text  0000000f func1
c0000000 g     F .text  0000000f func2

you see that func1 and func2 are in .text rather than .init-text where
they should be.

Running it compiled at 50be5d11289, you get the expected result:
$ objdump -x out.bin | grep func
c0000000 g     F .text  0000000a func3
00001000 g     F .init-text     0000000f func1
0000100f g     F .init-text     0000000f func2

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