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44 lines
1.9 KiB
Diff
44 lines
1.9 KiB
Diff
From 3eca75de67b3fd2c890715b30c7899cebc096fe9 Mon Sep 17 00:00:00 2001
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From: Thiago Macieira <thiago.macieira@intel.com>
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Date: Mon, 11 May 2015 18:30:00 +0900
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Subject: [PATCH] Make qglobal.h complain if you use -fPIE
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Prior to Qt 5.4.2 (commit 36d6eb721e7d5997ade75e289d4088dc48678d0d), we
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allowed it, but now we need to enforce that it is not used. Note that
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-fPIE does define __PIC__, so we need this to catch the use of -fPIE.
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[ChangeLog][Important Behavior Changes] On x86 and x86-64 systems with
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ELF binaries (especially Linux), due to a new optimization in GCC 5.x in
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combination with a recent version of GNU binutils, compiling Qt
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applications with -fPIE is no longer enough. Applications now need to be
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compiled with the -fPIC option if Qt's option "reduce relocations" is
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active. Note that Clang is known to generate incompatible code even with
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-fPIC if the -flto option is active.
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Task-number: QTBUG-45755
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Change-Id: I66a35ce5f88941f29aa6ffff13dd210e0aa2728f
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Reviewed-by: Dmitry Shachnev <mitya57@gmail.com>
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Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
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---
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src/corelib/global/qglobal.h | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
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index ef84662..4547877 100644
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--- a/src/corelib/global/qglobal.h
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+++ b/src/corelib/global/qglobal.h
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@@ -1047,9 +1047,9 @@ Q_CORE_EXPORT int qrand();
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# define QT_NO_SHAREDMEMORY
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#endif
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-#if !defined(QT_BOOTSTRAPPED) && defined(QT_REDUCE_RELOCATIONS) && defined(__ELF__) && !defined(__PIC__)
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+#if !defined(QT_BOOTSTRAPPED) && defined(QT_REDUCE_RELOCATIONS) && defined(__ELF__) && (!defined(__PIC__) || defined(__PIE__))
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# error "You must build your code with position independent code if Qt was built with -reduce-relocations. "\
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- "Compile your code with -fPIC."
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+ "Compile your code with -fPIC (-fPIE is not enough)."
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#endif
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namespace QtPrivate {
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--
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2.4.0
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