From 5c0b357bf67e38d94b32912ad3bd4023a726df7c Mon Sep 17 00:00:00 2001
From: Cory Fields <cory-nospam-@coryfields.com>
Date: Mon, 9 Nov 2015 20:52:37 -0500
Subject: build: Use fPIC rather than fPIE for qt objects.

But only if qt was built with reduced relocations.

Github-Pull: #6978
Rebased-From: 69d05134367da9a897ad14562a1d266750db450a
---
 build-aux/m4/bitcoin_qt.m4 | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'build-aux')

diff --git a/build-aux/m4/bitcoin_qt.m4 b/build-aux/m4/bitcoin_qt.m4
index 0ecacba0e6..c58397b684 100644
--- a/build-aux/m4/bitcoin_qt.m4
+++ b/build-aux/m4/bitcoin_qt.m4
@@ -179,6 +179,43 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
     fi
   fi
 
+  if test x$use_hardening != xno; then
+    BITCOIN_QT_CHECK([
+    AC_MSG_CHECKING(whether -fPIE can be used with this Qt config)
+    TEMP_CPPFLAGS=$CPPFLAGS
+    TEMP_CXXFLAGS=$CXXFLAGS
+    CPPFLAGS="$QT_INCLUDES $CPPFLAGS"
+    CXXFLAGS="$PIE_FLAGS $CXXFLAGS"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <QtCore/qconfig.h>]],
+      [[
+          #if defined(QT_REDUCE_RELOCATIONS)
+              choke;
+          #endif
+      ]])],
+      [ AC_MSG_RESULT(yes); QT_PIE_FLAGS=$PIE_FLAGS ],
+      [ AC_MSG_RESULT(no); QT_PIE_FLAGS=$PIC_FLAGS]
+    )
+    CPPFLAGS=$TEMP_CPPFLAGS
+    CXXFLAGS=$TEMP_CXXFLAGS
+    ])
+  else
+    BITCOIN_QT_CHECK([
+    AC_MSG_CHECKING(whether -fPIC is needed with this Qt config)
+    TEMP_CPPFLAGS=$CPPFLAGS
+    CPPFLAGS="$QT_INCLUDES $CPPFLAGS"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <QtCore/qconfig.h>]],
+      [[
+          #if defined(QT_REDUCE_RELOCATIONS)
+              choke;
+          #endif
+      ]])],
+      [ AC_MSG_RESULT(no)],
+      [ AC_MSG_RESULT(yes); QT_PIE_FLAGS=$PIC_FLAGS]
+    )
+    CPPFLAGS=$TEMP_CPPFLAGS
+    ])
+  fi
+
   BITCOIN_QT_PATH_PROGS([MOC], [moc-qt${bitcoin_qt_got_major_vers} moc${bitcoin_qt_got_major_vers} moc], $qt_bin_path)
   BITCOIN_QT_PATH_PROGS([UIC], [uic-qt${bitcoin_qt_got_major_vers} uic${bitcoin_qt_got_major_vers} uic], $qt_bin_path)
   BITCOIN_QT_PATH_PROGS([RCC], [rcc-qt${bitcoin_qt_got_major_vers} rcc${bitcoin_qt_got_major_vers} rcc], $qt_bin_path)
@@ -224,6 +261,7 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
   ])
   AC_MSG_RESULT([$bitcoin_enable_qt (Qt${bitcoin_qt_got_major_vers})])
 
+  AC_SUBST(QT_PIE_FLAGS)
   AC_SUBST(QT_INCLUDES)
   AC_SUBST(QT_LIBS)
   AC_SUBST(QT_LDFLAGS)
-- 
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