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[Bug gdb/21473] New: wrong type info for extern inline function when debugging Emacs
- From: "eggert at gnu dot org" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Mon, 08 May 2017 18:09:49 +0000
- Subject: [Bug gdb/21473] New: wrong type info for extern inline function when debugging Emacs
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=21473
Bug ID: 21473
Summary: wrong type info for extern inline function when
debugging Emacs
Product: gdb
Version: 7.12.1
Status: NEW
Severity: normal
Priority: P2
Component: gdb
Assignee: unassigned at sourceware dot org
Reporter: eggert at gnu dot org
Target Milestone: ---
Created attachment 10042
--> https://sourceware.org/bugzilla/attachment.cgi?id=10042&action=edit
gzipped tarball of three source files illustrating the bug
On x86-64, GDB Fedora 7.12.1-48.fc25 has problems decoding debugging
information generated by GCC 6.3.1 20161221 (Red Hat 6.3.1-1). The problem does
not occur when I use GCC 4.8.5 20150623 (Red Hat 4.8.5-11) to compile. Although
I originally reported this as a GCC bug
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80646>, Richard Biener starts to
believe that it is a GDB bug.
I ran into the problem while attempting to debug GNU Emacs, and constructed a
small test case to illustrate it. To reproduce it on Fedora 25 x86-64, extract
the files lisp.h, t.c and u.c from the attached tarball, and compile them by
running the shell command:
gcc -g3 -O2 t.c u.c
Then use GDB as follows:
$ gdb a.out
...
(gdb) ptype make_number
type = int ()
(gdb) ptype make_natnum
type = struct {
long i;
} (long)
(gdb) ptype XIL
type = struct {
long i;
} (long)
(gdb)
The reported type of 'make_number' is incorrect: it should be the same type as
that of make_natnum and XIL, but instead is a function returning 'int'. This
incorrect type can cause GDB to print incorrect results in expressions
involving make_number.
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