[Bug symtab/26800] New: [readnow] symtabs not expanded when re-reading

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26800

            Bug ID: 26800
           Summary: [readnow] symtabs not expanded when re-reading
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

There's a group of FAILs with -readnow:
...
FAIL: gdb.ada/exec_changed.exp: start second
FAIL: gdb.ada/exec_changed.exp: start just first
FAIL: gdb.base/reread.exp: opts= "" "" : run to foo() second time
FAIL: gdb.base/reread.exp: opts= "" "" : second pass: run to foo() second time
FAIL: gdb.base/reread.exp: opts= "-fPIE" "ldflags=-pie" : run to foo() second
time
FAIL: gdb.base/reread.exp: opts= "-fPIE" "ldflags=-pie" : second pass: run to
foo() second time
...

This FAIL:
...
FAIL: gdb.base/reread.exp: opts= "" "" : run to foo() second time
...
can be reproduced a follows.

First, run the test-case.  Then rename the reread exec to the original name:
...
$ mv outputs/gdb.base/reread/reread outputs/gdb.base/reread/reread2
...
such that we have:
...
$ ls -1 outputs/gdb.base/reread/reread*
outputs/gdb.base/reread/reread1
outputs/gdb.base/reread/reread2
...

Then, do a run without -readnow for contrast:
...
$ gdb -batch \
    -ex "shell cp outputs/gdb.base/reread/reread1 reread" \
    -ex "file reread" \
    -ex "b foo" \
    -ex run \
    -ex "shell rm reread" \
    -ex "shell cp outputs/gdb.base/reread/reread2 reread" \
    -ex "shell sleep 1" \
    -ex run
Breakpoint 1 at 0x654: file
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/reread1.c, line 14.

Breakpoint 1, foo () at
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/reread1.c:14
14        x++;
`/home/vries/gdb_versions/devel/reread' has changed; re-reading symbols.

Breakpoint 1, foo () at
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/reread2.c:9
9         x++;
...
Note that the second time we hit foo, it shows foo at reread2.c:9.

With -readnow however, the second time we hit foo, no file/lineno is shown:
...
Breakpoint 1 at 0x654: file
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/reread1.c, line 14.

Breakpoint 1, foo () at
/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/reread1.c:14
14        x++;
`/home/vries/gdb_versions/devel/reread' has changed; re-reading symbols.

Breakpoint 1, 0x000055555555468e in foo ()
...

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