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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/111151] [12/13/14 Regression] Wrong code at -O0 on
 x86_64-pc-linux-gnu
Date: Fri, 25 Aug 2023 12:28:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111151

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 55794
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55794&action=3Dedit
fold "dumping"

This adds DUMP_FOLD, but I get

/home/rguenther/src/trunk/gcc/fold-const.cc:6808:22: warning: ISO C++ forbi=
ds
braced-groups within expressions [-Wpedantic]
 #define DUMP_FOLD(X) ({ auto x =3D (X); if (x && dump_file && (dump_flags &
TDF_FOLDING)) fprintf (dump_file, "Applying fold-const.c:%d\n", __LINE__); =
x;
})
                      ^
/home/rguenther/src/trunk/gcc/fold-const.cc:7193:15: note: in expansion of
macro 'DUMP_FOLD'
        return DUMP_FOLD (fold_build2 (code, ctype, fold_convert (ctype, op=
0),
               ^~~~~~~~~

with

#define DUMP_FOLD(X) ({ auto x =3D (X); if (x && dump_file && (dump_flags &
TDF_FOLDING)) fprintf (dump_file, "Applying fold-const.c:%d\n", __LINE__); =
x;
})

so maybe need to use __extension__ and #if __GNUC for this?=