[gcc r14-4293] remove workaround for GCC 4.1-4.3 [PR105606]

[Jakub Jelinek <jakub@gcc.gnu.org>]

https://gcc.gnu.org/g:3ba882c7b51ab1f14c62c748e989415834ccd9ce

commit r14-4293-g3ba882c7b51ab1f14c62c748e989415834ccd9ce
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Sep 27 10:38:54 2023 +0200

    remove workaround for GCC 4.1-4.3 [PR105606]
    
    While looking into vec.h, I've noticed we still have a workaround for
    GCC 4.1-4.3 bugs.
    As we now use C++11 and thus need to be built by GCC 4.8 or later,
    I think this is now never used.
    
    2023-09-27  Jakub Jelinek  <jakub@redhat.com>
    
            PR c++/105606
            * system.h (BROKEN_VALUE_INITIALIZATION): Don't define.
            * vec.h (vec_default_construct): Remove BROKEN_VALUE_INITIALIZATION
            workaround.
            * function.cc (assign_parm_find_data_types): Likewise.

Diff:
---
 gcc/function.cc |  8 --------
 gcc/system.h    |  6 ------
 gcc/vec.h       | 15 ---------------
 3 files changed, 29 deletions(-)

diff --git a/gcc/function.cc b/gcc/function.cc
index dd2c1136e07..e92384a8907 100644
--- a/gcc/function.cc
+++ b/gcc/function.cc
@@ -2429,15 +2429,7 @@ assign_parm_find_data_types (struct assign_parm_data_all *all, tree parm,
 {
   int unsignedp;
 
-#ifndef BROKEN_VALUE_INITIALIZATION
   *data = assign_parm_data_one ();
-#else
-  /* Old versions of GCC used to miscompile the above by only initializing
-     the members with explicit constructors and copying garbage
-     to the other members.  */
-  assign_parm_data_one zero_data = {};
-  *data = zero_data;
-#endif
 
   /* NAMED_ARG is a misnomer.  We really mean 'non-variadic'. */
   if (!cfun->stdarg)
diff --git a/gcc/system.h b/gcc/system.h
index 5109c60c600..e924152ad4c 100644
--- a/gcc/system.h
+++ b/gcc/system.h
@@ -905,12 +905,6 @@ extern void fancy_abort (const char *, int, const char *)
 /* Some compilers do not allow the use of unsigned char in bitfields.  */
 #define BOOL_BITFIELD unsigned int
 
-/* GCC older than 4.4 have broken C++ value initialization handling, see
-   PR11309, PR30111, PR33916, PR82939 and PR84405 for more details.  */
-#if GCC_VERSION > 0 && GCC_VERSION < 4004 && !defined(__clang__)
-# define BROKEN_VALUE_INITIALIZATION
-#endif
-
 /* As the last action in this file, we poison the identifiers that
    shouldn't be used.  Note, luckily gcc-3.0's token-based integrated
    preprocessor won't trip on poisoned identifiers that arrive from
diff --git a/gcc/vec.h b/gcc/vec.h
index 6f7b0487eb6..8a9a8d83de5 100644
--- a/gcc/vec.h
+++ b/gcc/vec.h
@@ -512,21 +512,6 @@ template <typename T>
 inline void
 vec_default_construct (T *dst, unsigned n)
 {
-#ifdef BROKEN_VALUE_INITIALIZATION
-  /* Versions of GCC before 4.4 sometimes leave certain objects
-     uninitialized when value initialized, though if the type has
-     user defined default ctor, that ctor is invoked.  As a workaround
-     perform clearing first and then the value initialization, which
-     fixes the case when value initialization doesn't initialize due to
-     the bugs and should initialize to all zeros, but still allows
-     vectors for types with user defined default ctor that initializes
-     some or all elements to non-zero.  If T has no user defined
-     default ctor and some non-static data members have user defined
-     default ctors that initialize to non-zero the workaround will
-     still not work properly; in that case we just need to provide
-     user defined default ctor.  */
-  memset (dst, '\0', sizeof (T) * n);
-#endif
   for ( ; n; ++dst, --n)
     ::new (static_cast<void*>(dst)) T ();
 }