qemu-devel.nongnu.org archive mirror
 help / color / mirror / Atom feed
From: Paolo Bonzini <pbonzini@redhat.com>
To: qemu-devel@nongnu.org
Cc: vr_qemu@t-online.de, marcandre.lureau@redhat.com
Subject: [PATCH] meson: remove -no-pie linker flag
Date: Mon, 22 May 2023 10:08:16 +0200	[thread overview]
Message-ID: <20230522080816.66320-1-pbonzini@redhat.com> (raw)

The large comment in the patch says it all; the -no-pie flag is broken and
this is why it was not included in QEMU_LDFLAGS before commit a988b4c5614
("build: move remaining compiler flag tests to meson", 2023-05-18).

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1664
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 meson.build | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/meson.build b/meson.build
index 0a5cdefd4d3d..6733b2917081 100644
--- a/meson.build
+++ b/meson.build
@@ -267,10 +267,15 @@ endif
 # has explicitly disabled PIE we need to extend our cflags.
 if not get_option('b_pie')
   qemu_common_flags += cc.get_supported_arguments('-fno-pie')
-  if not get_option('prefer_static')
-    # No PIE is implied by -static which we added above.
-    qemu_ldflags += cc.get_supported_link_arguments('-no-pie')
-  endif
+  # What about linker flags?  For a static build, no PIE is implied by -static
+  # which we added above.  For dynamic linking, adding -no-pie is messy because
+  # it overrides -shared: the linker then wants to build an executable instead
+  # of a shared library and the build fails.  Before moving this code to Meson,
+  # we went through a dozen different commits affecting the usage of -no-pie,
+  # ultimately settling for a completely broken one that added -no-pie to the
+  # compiler flags together with -fno-pie... except that -no-pie is a linker
+  # flag that has no effect on the compiler command line.  So, don't add
+  # -no-pie anywhere and cross fingers.
 endif
 
 if not get_option('stack_protector').disabled()
-- 
2.40.1



             reply	other threads:[~2023-05-22  8:09 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-22  8:08 Paolo Bonzini [this message]
2023-05-22  8:19 ` [PATCH] meson: remove -no-pie linker flag Philippe Mathieu-Daudé
2023-05-22 14:39 ` Richard Henderson
2023-05-23  7:23   ` Paolo Bonzini
2023-05-22 15:54 ` Richard Henderson
2023-05-23  7:52   ` Michael Tokarev
2023-05-23  5:57 ` Volker Rümelin
2023-05-23  8:00 ` Daniel P. Berrangé
2023-05-23  8:02   ` Paolo Bonzini
2023-05-23  8:18     ` Daniel P. Berrangé
2023-05-23 11:55       ` Paolo Bonzini
2023-05-23 13:14       ` Richard Henderson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20230522080816.66320-1-pbonzini@redhat.com \
    --to=pbonzini@redhat.com \
    --cc=marcandre.lureau@redhat.com \
    --cc=qemu-devel@nongnu.org \
    --cc=vr_qemu@t-online.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).