https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111911
--- Comment #9 from GCC Commits ---
The master branch has been updated by Joseph Myers :
https://gcc.gnu.org/g:bfd72bb44eca83b0db2b0bab895f27a8a44247a2
commit r14-8874-gbfd72bb44eca83b0db2b0bab895f27a8a44247a2
Author: Joseph Myers
Date: Thu Feb 8 01:34:09 2024 +
c: Fix boolean conversion of floating constant as integer constant
expression [PR113776]
My fix for bug 111059 and bug 111911 caused a conversion of a floating
constant to boolean to wrongly no longer be considered an integer
constant expression, because logic to insert a NOP_EXPR in
c_objc_common_truthvalue_conversion for an argument not an integer
constant expression itself now took place after rather than before the
conversion to bool. In the specific case of casting a floating
constant to bool, the result is an integer constant expression even
though the argument isn't (build_c_cast deals with ensuring that casts
to integer type of anything of floating type more complicated than a
single floating constant don't get wrongly treated as integer constant
expressions even if they fold to constants), so fix the logic in
c_objc_common_truthvalue_conversion to handle that special case.
Bootstrapped with no regressions for x86_64-pc-linux-gnu.
PR c/113776
gcc/c
* c-typeck.cc (c_objc_common_truthvalue_conversion): Return an
integer constant expression for boolean conversion of floating
constant.
gcc/testsuite/
* gcc.dg/pr113776-1.c, gcc.dg/pr113776-2.c, gcc.dg/pr113776-3.c,
gcc.dg/pr113776-4.c: New tests.