Workaround gcc-8.0: -Wno-error=cast-function-type,stringop-truncation

Fix ppc64 stwux encoding as found by gcc-8.0 -Werror=tautological-compare.
This commit is contained in:
Jan Kratochvil 2018-02-04 21:49:30 +01:00
parent 188c9fbf90
commit 4a848ebc38
5 changed files with 76 additions and 1 deletions

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@ -520,3 +520,6 @@ Patch124: gdb-vla-intel-fix-print-char-array.patch
# Fix -D_GLIBCXX_DEBUG gdb-add-index regression (RH BZ 1540559).
Patch125: gdb-rhbz1540559-gdbaddindex-glibcdebug-regression.patch
# Fix ppc64 stwux encoding as found by gcc-8.0 -Werror=tautological-compare.
Patch126: gdb-ppc64-stwux-tautological-compare.patch

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@ -123,3 +123,4 @@
%patch123 -p1
%patch124 -p1
%patch125 -p1
%patch126 -p1

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@ -123,3 +123,4 @@ gdb-testsuite-readline63-sigint.patch
gdb-archer.patch
gdb-vla-intel-fix-print-char-array.patch
gdb-rhbz1540559-gdbaddindex-glibcdebug-regression.patch
gdb-ppc64-stwux-tautological-compare.patch

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@ -0,0 +1,56 @@
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Jan Kratochvil <jan.kratochvil@redhat.com>
Date: Sun, 4 Feb 2018 21:42:18 +0100
Subject: gdb-ppc64-stwux-tautological-compare.patch
FileName: gdb-ppc64-stwux-tautological-compare.patch
;; Fix ppc64 stwux encoding as found by gcc-8.0 -Werror=tautological-compare.
[patch] ppc64: Fix stwux encoding
https://sourceware.org/ml/gdb-patches/2018-02/msg00058.html
with gcc-8.0.1-0.9.fc28.x86_64 I get:
../../gdb/rs6000-tdep.c: In function 'CORE_ADDR skip_prologue(gdbarch*, CORE_ADDR, CORE_ADDR, rs6000_framedata*)':
../../gdb/rs6000-tdep.c:1911:34: error: bitwise comparison always evaluates to false [-Werror=tautological-compare]
else if ((op & 0xfc1f016a) == 0x7c01016e)
~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
The code is there since:
commit 98f08d3d9b69b344bb8b0cd2a4bda1cf4d966e20
Author: Kevin Buettner <kevinb@redhat.com>
Date: Thu May 29 19:47:14 2003 +0000
From Jimi X <jimix@watson.ibm.com>:
* rs6000-tdep.c (skip_prologue): Improve support for 64-bit code.
So I do not think we can find the original author.
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/com.ibm.aix.alangref/idalangref_stwux_stux_instrs.htm
says
bit 21 - 30 = 183
Those are bits 1..10 in normal bit order: 183<<1 = 0x16e
gdb/ChangeLog
2018-02-04 Jan Kratochvil <jan.kratochvil@redhat.com>
* rs6000-tdep.c (skip_prologue): Fix stwux encoding.
---
gdb/rs6000-tdep.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index 23d0db3b8f..5275ff5b91 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -1908,7 +1908,7 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc,
offset = fdata->offset;
continue;
}
- else if ((op & 0xfc1f016a) == 0x7c01016e)
+ else if ((op & 0xfc1f016e) == 0x7c01016e)
{ /* stwux rX,r1,rY */
/* No way to figure out what r1 is going to be. */
fdata->frameless = 0;
--
2.14.3

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@ -26,7 +26,7 @@ Version: 8.1
# The release always contains a leading reserved number, start it at 1.
# `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
Release: 4%{?dist}
Release: 5%{?dist}
License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and LGPLv3+ and BSD and Public Domain and GFDL
Group: Development/Debuggers
@ -497,6 +497,16 @@ cd %{gdb_build}$fprofile
export CFLAGS="$RPM_OPT_FLAGS %{?_with_asan:-fsanitize=address}"
export LDFLAGS="%{?__global_ldflags} %{?_with_asan:-fsanitize=address}"
# FIXME: gcc-8.0:
# ./elf32-target.h:215:4: error: cast between incompatible function types from 'void * (*)(bfd *)' {aka 'void * (*)(struct bfd *)'} to 'asymbol * (*)(bfd *, void *, long unsigned int)' {aka 'struct bfd_symbol * (*)(struct bfd *, void *, long unsigned int)'} [-Werror=cast-function-type]
# ((asymbol * (*) (bfd *, void *, unsigned long)) bfd_nullvoidptr)
CFLAGS="$CFLAGS -Wno-error=cast-function-type"
# FIXME: gcc-8.0:
# linux-tdep.c:1767:11: error: char* strncpy(char*, const char*, size_t) specified bound 17 equals destination size [-Werror=stringop-truncation]
# strncpy (p->pr_fname, basename, sizeof (p->pr_fname));
CFLAGS="$CFLAGS -Wno-error=stringop-truncation"
%if 0%{!?rhel:1} || 0%{?rhel} > 7
CFLAGS="$CFLAGS -DDNF_DEBUGINFO_INSTALL"
%endif
@ -1017,6 +1027,10 @@ then
fi
%changelog
* Sun Feb 4 2018 Jan Kratochvil <jan.kratochvil@redhat.com> - 8.1-5.fc28
- Workaround gcc-8.0: -Wno-error=cast-function-type,stringop-truncation
- Fix ppc64 stwux encoding as found by gcc-8.0 -Werror=tautological-compare.
* Sun Feb 4 2018 Jan Kratochvil <jan.kratochvil@redhat.com> - 8.1-4.fc28
- Fix -D_GLIBCXX_DEBUG gdb-add-index regression (RH BZ 1540559).