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From: "gcc-bugzilla at mkarcher dot dialup.fu-berlin.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94504] On powerpc, -ffunction-sections -fdata-sections is not as effective as expected for non-PIE executables.
Date: Tue, 07 Apr 2020 21:28:46 +0000	[thread overview]
Message-ID: <bug-94504-4-9VQHaYZXPj@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-94504-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94504

--- Comment #5 from Michael Karcher <gcc-bugzilla at mkarcher dot dialup.fu-berlin.de> ---
I got the command line of gcc wrong. "-pie" just sets the linker flags for PIE
linking, but it does *not* compile source code as PIE. If I use "-fpie",
garbage collection does what it is supposed to do.

As I found out, the acutal problem I have is completely unrelated to gcc (sorry
for the noise here), because it concerns object files created by rustc (which
has an llvm backend) linked by binutil's ld tool. At the moment I was able to
reproduce the same symptom I have with those rust objects with a ten-line C
program, I considered fixing the problem (if possible) for C first a good idea.

As it stands now, the issue in gcc (no effective garbage collection for non-PIE
executables with function pointers in global data structures) still stands, so
I am not closing the bug right away.

  parent reply	other threads:[~2020-04-07 21:28 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-06 18:08 [Bug target/94504] New: On powerpc, -ffunction-sections -fdata-sections is not as effective as expected for PIE executables gcc-bugzilla at mkarcher dot dialup.fu-berlin.de
2020-04-07  6:47 ` [Bug target/94504] " rguenth at gcc dot gnu.org
2020-04-07  7:04 ` rguenth at gcc dot gnu.org
2020-04-07 15:09 ` gcc-bugzilla at mkarcher dot dialup.fu-berlin.de
2020-04-07 17:14 ` rguenther at suse dot de
2020-04-07 21:28 ` gcc-bugzilla at mkarcher dot dialup.fu-berlin.de [this message]
2020-04-13  3:49 ` [Bug target/94504] On powerpc, -ffunction-sections -fdata-sections is not as effective as expected for PIE and PIC amodra at gmail dot com
2020-04-13  6:53 ` glaubitz at physik dot fu-berlin.de

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