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54 lines
2 KiB
Diff
54 lines
2 KiB
Diff
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From 979ae78318c3e37cc0e0579b8d1f05c46bb76e7d Mon Sep 17 00:00:00 2001
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From: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
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Date: Tue, 19 May 2020 20:35:49 +0300
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Subject: [PATCH] meson: Disable GCC's dead store elimination for memory
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zeroing custom new
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Some classes use custom new operator which zeroes memory, however gcc does
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aggressive dead-store elimination which threats all writes to the memory
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before the constructor as "dead stores".
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For now we disable this optimization.
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The new operators in question are declared via:
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DECLARE_RZALLOC_CXX_OPERATORS
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DECLARE_LINEAR_ZALLOC_CXX_OPERATORS
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The issue was found with lto builds, however there is no guarantee that
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it didn't happen with ordinary ones.
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CC: <mesa-stable@lists.freedesktop.org>
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Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/2977
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Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/1358
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Signed-off-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
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Reviewed-by: Marek Olšák <marek.olsak@amd.com>
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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5104>
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(cherry picked from commit 5500a2b7fc558217bbd4c2a966ab6fcadaed8b3b)
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Signed-off-by: Laurent Carlier <lordheavym@gmail.com>
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---
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meson.build | 5 +++++
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1 files changed, 5 insertions(+), 0 deletion(-)
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diff --git a/meson.build b/meson.build
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index ba4fdb2a59f..434684c8bcc 100644
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--- a/meson.build
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+++ b/meson.build
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@@ -980,6 +980,11 @@ else
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'-fno-math-errno',
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'-fno-trapping-math',
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'-Qunused-arguments',
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+ # Some classes use custom new operator which zeroes memory, however
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+ # gcc does aggressive dead-store elimination which threats all writes
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+ # to the memory before the constructor as "dead stores".
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+ # For now we disable this optimization.
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+ '-flifetime-dse=1',
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]
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# MinGW chokes on format specifiers and I can't get it all working
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if not (cc.get_id() == 'gcc' and host_machine.system() == 'windows')
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--
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2.26.2
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