bug#55595: 29.0.50; Compilation warnings on macOS

bug#55595: 29.0.50; Compilation warnings on macOS

[Rudolf Adamkovič via Bug reports for GNU Emacs, the Swiss army knife of text editors]

FYI, I see the following compilation warnings (@ commit 5a1a67a256):

  CC       comp.o
comp.c:2816:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:4698:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:4714:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:4967:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:5351:11: warning: variable 'data_ephemeral_vec' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
      if (!recursive_load)
          ^~~~~~~~~~~~~~~
comp.c:5365:28: note: uninitialized use occurs here
      data_ephemeral_vec = data_ephemeral_vec;
                           ^~~~~~~~~~~~~~~~~~
comp.c:5351:7: note: remove the 'if' if its condition is always true
      if (!recursive_load)
      ^~~~~~~~~~~~~~~~~~~~
comp.c:5345:46: note: initialize the variable 'data_ephemeral_vec' to silence this warning
      Lisp_Object volatile data_ephemeral_vec;
                                             ^
                                              = NULL

Rudy

In GNU Emacs 29.0.50 (build 14, x86_64-apple-darwin21.4.0, NS appkit-2113.40 Version 12.3.1 (Build 21E258))
 of 2022-05-21 built on Workstation.local
Repository revision: fb752561eab92343683552a5780dd80406936d09
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.3.1

Configured using:
 'configure --with-json --with-native-compilation'

Configured features:
ACL DBUS GIF GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY
KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP XIM
ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Magit

Minor modes in effect:
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  magit-auto-revert-mode: t
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  corfu-mode: t
  org-roam-db-autosync-mode: t
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Memory information:
((conses 16 2178366 173575)
 (symbols 48 59259 3)
 (strings 32 350417 14205)
 (string-bytes 1 10593088)
 (vectors 16 125532)
 (vector-slots 8 2879350 189088)
 (floats 8 1346 958)
 (intervals 56 130004 13422)
 (buffers 992 54))

-- 
"The whole science is nothing more than a refinement of everyday
thinking."
-- Albert Einstein, 1879-1955

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

bug#55595: 29.0.50; Compilation warnings on macOS

[Eli Zaretskii]

> Date: Mon, 23 May 2022 17:42:15 +0200
> From:  Rudolf Adamkovič via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 
> FYI, I see the following compilation warnings (@ commit 5a1a67a256):
> 
>   CC       comp.o
> comp.c:2816:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
> #pragma GCC diagnostic pop
>                        ^
> comp.c:4698:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
> #pragma GCC diagnostic pop
>                        ^
> comp.c:4714:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
> #pragma GCC diagnostic pop
>                        ^
> comp.c:4967:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
> #pragma GCC diagnostic pop
>                        ^
> comp.c:5351:11: warning: variable 'data_ephemeral_vec' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
>       if (!recursive_load)
>           ^~~~~~~~~~~~~~~
> comp.c:5365:28: note: uninitialized use occurs here
>       data_ephemeral_vec = data_ephemeral_vec;
>                            ^~~~~~~~~~~~~~~~~~
> comp.c:5351:7: note: remove the 'if' if its condition is always true
>       if (!recursive_load)
>       ^~~~~~~~~~~~~~~~~~~~
> comp.c:5345:46: note: initialize the variable 'data_ephemeral_vec' to silence this warning
>       Lisp_Object volatile data_ephemeral_vec;
>                                              ^
>                                               = NULL

Is this GCC or Clang?

If the latter, I guess we should disable -Wunknown-pragmas for it.

The last warning is silly, but I guess it cannot harm anyone to
initialize the variable where it's declared.

bug#55595: 29.0.50; Compilation warnings on macOS

[Rudolf Adamkovič via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

> Is this GCC or Clang?

Clang.

Rudy
-- 
"It is no paradox to say that in our most theoretical moods we may be
nearest to our most practical applications."
-- Alfred North Whitehead, 1861-1947

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

bug#55595: 29.0.50; Compilation warnings on macOS

[Eli Zaretskii]

> From: Rudolf Adamkovič <salutis@me.com>
> Cc: 55595@debbugs.gnu.org
> Date: Mon, 23 May 2022 18:10:18 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Is this GCC or Clang?
> 
> Clang.

Thanks, please try the latest master branch, where I tried to fix
that.

bug#55595: 29.0.50; Compilation warnings on macOS

[Rudolf Adamkovič via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

> Thanks, please try the latest master branch, where I tried to fix
> that.

I tried again at:

8f279c8666dc642ed1f8f49aa709530fcea47374

Compile command:

./configure --with-json --with-native-compilation && make && make install

I get 4 errors in the compilation buffer ...

./configure: line 43329: sort: No such file or directory
./configure: line 43326: sed: No such file or directory

./configure: line 44836: sort: No such file or directory
./configure: line 44833: sed: No such file or directory

... and I get 4 warnings in the compilation buffer:

comp.c:2816:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:4698:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:4714:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:4967:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^

Despite the errors, the compilation continues and completes.

Rudy
-- 
"Be especially critical of any statement following the word
'obviously.'"
-- Anna Pell Wheeler, 1883-1966

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

bug#55595: 29.0.50; Compilation warnings on macOS

[Eli Zaretskii]

> From: Rudolf Adamkovič <salutis@me.com>
> Cc: 55595@debbugs.gnu.org
> Date: Thu, 02 Jun 2022 20:36:58 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Thanks, please try the latest master branch, where I tried to fix
> > that.
> 
> I tried again at:
> 
> 8f279c8666dc642ed1f8f49aa709530fcea47374
> 
> Compile command:
> 
> ./configure --with-json --with-native-compilation && make && make install

Did you regenerate configure before running the above?  The change is
in configure.ac, so you need to run ./autogen.sh to regenerate the
configure script from configure.ac.

(In general, I suggest to always say "make && make install", because
that will run the configure script automatically when needed, and will
regenerate the configure script automatically when configure.ac was
updated.)

> comp.c:2816:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
> #pragma GCC diagnostic pop
>                        ^
> comp.c:4698:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
> #pragma GCC diagnostic pop
>                        ^
> comp.c:4714:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
> #pragma GCC diagnostic pop
>                        ^
> comp.c:4967:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
> #pragma GCC diagnostic pop

I guess this means you did not regenerate the configure script?  Or
maybe the compiler doesn't identify itself as clang, so the changes I
did don't have effect?

bug#55595: 29.0.50; Compilation warnings on macOS

[Rudolf Adamkovič via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

>> ./configure --with-json --with-native-compilation && make && make install
>
> Did you regenerate configure before running the above?  The change is
> in configure.ac, so you need to run ./autogen.sh to regenerate the
> configure script from configure.ac.
>
> (In general, I suggest to always say "make && make install", because
> that will run the configure script automatically when needed, and will
> regenerate the configure script automatically when configure.ac was
> updated.)
>
> […]
>
> I guess this means you did not regenerate the configure script?  Or
> maybe the compiler doesn't identify itself as clang, so the changes I
> did don't have effect?

I retried with ...

./autogen.sh \
  && ./configure --with-json --with-native-compilation \
  && make \
  && make install

... and I still get the same 4 errors and 4 warnings.

Rudy
-- 
"Logic is a science of the necessary laws of thought, without which no
employment of the understanding and the reason takes place."
-- Immanuel Kant, 1785

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

bug#55595: 29.0.50; Compilation warnings on macOS

[Eli Zaretskii]

> From: Rudolf Adamkovič <salutis@me.com>
> Cc: 55595@debbugs.gnu.org
> Date: Fri, 03 Jun 2022 21:37:40 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I guess this means you did not regenerate the configure script?  Or
> > maybe the compiler doesn't identify itself as clang, so the changes I
> > did don't have effect?
> 
> I retried with ...
> 
> ./autogen.sh \
>   && ./configure --with-json --with-native-compilation \
>   && make \
>   && make install
> 
> ... and I still get the same 4 errors and 4 warnings.

I'm sorry, I'm flying blind here, as I have no access to this
compiler.  I've now tried a more radical solution, please see if the
latest master branch solves this.

bug#55595: 29.0.50; Compilation warnings on macOS

[Rudolf Adamkovič via Bug reports for GNU Emacs, the Swiss army knife of text editors]

[-- Attachment #1: Type: text/plain, Size: 1043 bytes --]

Eli Zaretskii <eliz@gnu.org> writes:

> I'm sorry, I'm flying blind here, as I have no access to this
> compiler.  I've now tried a more radical solution, please see if the
> latest master branch solves this.

I still see the first four warnings at 6011d39b6a:

  CC       comp.o
comp.c:2816:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:4698:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:4714:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^
comp.c:4967:24: warning: pragma diagnostic pop could not pop, no matching push [-Wunknown-pragmas]
#pragma GCC diagnostic pop
                       ^

I wonder, why not add the missing pushes?  When I apply the patch below,
Clang reports 0 warnings.  Would that break some other compiler or
something?

Rudy


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: 0001-Fix-diagnostic-push-pop-compiler-warnings-on-macOS.patch --]
[-- Type: text/x-patch, Size: 2286 bytes --]

From 7ae3ef0ad33062128858c29645f641230092f26d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rudolf=20Adamkovi=C4=8D?= <salutis@me.com>
Date: Sun, 5 Jun 2022 12:04:49 +0200
Subject: [PATCH] Fix diagnostic push/pop compiler warnings on macOS

* src/comp.c: Add missing "#pragma diagnostic" pushes.
* configure.ac: Revert previous attempts to fix Clang warnings.
---
 configure.ac | 2 --
 src/comp.c   | 4 ++++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 313a1436b5..1d2d1f190b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1024,7 +1024,6 @@ AC_DEFUN
      gl_WARN_ADD([-Wno-pointer-sign])
      gl_WARN_ADD([-Wno-string-plus-int])
      gl_WARN_ADD([-Wno-unknown-attributes])
-     gl_WARN_ADD([-Wno-unknown-pragmas])
    ])
  ],[
   isystem='-isystem '
@@ -1085,7 +1084,6 @@ AC_DEFUN
 
   if test "$emacs_cv_clang" = yes; then
     nw="$nw -Wdouble-promotion"
-    nm="$nm -Wunknown-pragmas"
   fi
 
   # This causes too much noise in the MinGW build.
diff --git a/src/comp.c b/src/comp.c
index 97bc6a5f9d..ea376a4370 100644
--- a/src/comp.c
+++ b/src/comp.c
@@ -2626,6 +2626,7 @@ emit_maybe_gc_or_quit (Lisp_Object insn)
 
 /* This is in charge of serializing an object and export a function to
    retrieve it at load time.  */
+#pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Waddress"
 static void
 emit_static_object (const char *name, Lisp_Object obj)
@@ -4681,6 +4682,7 @@ DEFUN ("comp--release-ctxt", Fcomp__release_ctxt, Scomp__release_ctxt,
   return Qt;
 }
 
+#pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Waddress"
 DEFUN ("comp-native-driver-options-effective-p",
        Fcomp_native_driver_options_effective_p,
@@ -4697,6 +4699,7 @@ DEFUN ("comp-native-driver-options-effective-p",
 }
 #pragma GCC diagnostic pop
 
+#pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Waddress"
 DEFUN ("comp-native-compiler-options-effective-p",
        Fcomp_native_compiler_options_effective_p,
@@ -4943,6 +4946,7 @@ DEFUN ("comp--compile-ctxt-to-file", Fcomp__compile_ctxt_to_file,
   return filename;
 }
 
+#pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Waddress"
 DEFUN ("comp-libgccjit-version", Fcomp_libgccjit_version,
        Scomp_libgccjit_version, 0, 0, 0,
-- 
2.36.1


[-- Attachment #3: Type: text/plain, Size: 208 bytes --]

-- 
"Be especially critical of any statement following the word
'obviously.'"
-- Anna Pell Wheeler, 1883-1966

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

bug#55595: 29.0.50; Compilation warnings on macOS

[Eli Zaretskii]

> From: Rudolf Adamkovič <salutis@me.com>
> Cc: 55595@debbugs.gnu.org
> Date: Sun, 05 Jun 2022 12:51:43 +0200
> 
> I wonder, why not add the missing pushes?  When I apply the patch below,
> Clang reports 0 warnings.  Would that break some other compiler or
> something?

I have no idea; I will let experts chime in.

bug#55595: 29.0.50; Compilation warnings on macOS

[Rudolf Adamkovič via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

> I have no idea; I will let experts chime in.

We can close this bug report.  Someone has pushed the necessary changes
discussed above.  Thank you for your time.

Rudy
-- 
"Genius is 1% inspiration and 99% perspiration."
-- Thomas Alva Edison, 1932

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

bug#55595: 29.0.50; Compilation warnings on macOS

[Eli Zaretskii]

> From: Rudolf Adamkovič <salutis@me.com>
> Cc: 55595@debbugs.gnu.org
> Date: Sun, 20 Nov 2022 01:07:41 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I have no idea; I will let experts chime in.
> 
> We can close this bug report.  Someone has pushed the necessary changes
> discussed above.  Thank you for your time.

Thanks, done.