From: Florian Weimer <fweimer@redhat.com>
To: gcc-patches@gcc.gnu.org
Subject: [PATCH v3 07/11] c: Turn -Wimplicit-int into a permerror
Date: Mon, 20 Nov 2023 10:56:20 +0100 [thread overview]
Message-ID: <39a598d6663a50d6df47aaeb01d097bcb62e11a7.1700473918.git.fweimer@redhat.com> (raw)
In-Reply-To: <cover.1700473918.git.fweimer@redhat.com>
Most of these new permerrors are currently not diagnosed in system
headers.
gcc/
PR c/91093
PR c/96284
* doc/invoke.texi (Warning Options): Document changes.
gcc/c/
* c-decl.cc (warn_defaults_to): Remove.
(grok_declarator, start_function): Call permerror_opt
instead of warn_defaults_to.
(store_parm_decls_oldstyle): Call permerror_opt for
OPT_Wimplicit_int.
gcc/testsuite/
* gcc.dg/permerror-default.c (implicit_int_1, implicit_int_2)
(implicit_int_3, implicit_int_4): Expect new permerror.
* gcc.dg/permerror-system.c: Expect a single new permerror.
* gcc.dg/Wimplicit-int-1.c: Compile with -fpermissive due to
expected warning.
* gcc.dg/Wimplicit-int-4.c: Likewise.
* gcc.dg/Wimplicit-int-1a.c: New test. Copied from
gcc.dg/Wimplicit-int-1.c, but expect errors.
* gcc.dg/Wimplicit-int-4a.c: New test. Copied from
gcc.dg/Wimplicit-int-4.c, but expect errors.
* gcc.dg/gnu23-attr-syntax-2.c: Compile with -fpermissive
due to expected implicit-int error.
* gcc.dg/gnu23-attr-syntax-3.c: New test. Copied from
gcc.dg/gnu23-attr-syntax-2.c, but expect an error.
* gcc.dg/pr105635.c: Build with -fpermissive due to implicit
int.
* gcc.dg/pr105635-2.c: New test. Copied from
gcc.dg/pr105635.c. Expect implicit int error.
* gcc.dg/noncompile/pr79758.c: Build with -fpermissive due to
implicit int.
* gcc.dg/noncompile/pr79758-2.c: New test. Copied from
gcc.dg/noncompile/pr79758.c. Expect implicit int error.
---
gcc/c/c-decl.cc | 43 ++++++---------------
gcc/doc/invoke.texi | 7 +++-
gcc/testsuite/gcc.dg/Wimplicit-int-1.c | 2 +-
gcc/testsuite/gcc.dg/Wimplicit-int-1a.c | 11 ++++++
gcc/testsuite/gcc.dg/Wimplicit-int-4.c | 2 +-
gcc/testsuite/gcc.dg/Wimplicit-int-4a.c | 11 ++++++
gcc/testsuite/gcc.dg/gnu23-attr-syntax-2.c | 2 +-
gcc/testsuite/gcc.dg/gnu23-attr-syntax-3.c | 17 ++++++++
gcc/testsuite/gcc.dg/noncompile/pr79758-2.c | 6 +++
gcc/testsuite/gcc.dg/noncompile/pr79758.c | 1 +
gcc/testsuite/gcc.dg/permerror-default.c | 12 +++---
gcc/testsuite/gcc.dg/permerror-system.c | 2 +
gcc/testsuite/gcc.dg/pr105635-2.c | 11 ++++++
gcc/testsuite/gcc.dg/pr105635.c | 2 +-
14 files changed, 86 insertions(+), 43 deletions(-)
create mode 100644 gcc/testsuite/gcc.dg/Wimplicit-int-1a.c
create mode 100644 gcc/testsuite/gcc.dg/Wimplicit-int-4a.c
create mode 100644 gcc/testsuite/gcc.dg/gnu23-attr-syntax-3.c
create mode 100644 gcc/testsuite/gcc.dg/noncompile/pr79758-2.c
create mode 100644 gcc/testsuite/gcc.dg/pr105635-2.c
diff --git a/gcc/c/c-decl.cc b/gcc/c/c-decl.cc
index 011f0bf0a69..893e24f7dc6 100644
--- a/gcc/c/c-decl.cc
+++ b/gcc/c/c-decl.cc
@@ -647,8 +647,6 @@ static tree grokdeclarator (const struct c_declarator *,
bool *, enum deprecated_states);
static tree grokparms (struct c_arg_info *, bool);
static void layout_array_type (tree);
-static void warn_defaults_to (location_t, int, const char *, ...)
- ATTRIBUTE_GCC_DIAG(3,4);
static const char *header_for_builtin_fn (tree);
\f
/* T is a statement. Add it to the statement-tree. This is the
@@ -6570,23 +6568,6 @@ warn_variable_length_array (tree name, tree size)
}
}
-/* Print warning about defaulting to int if necessary. */
-
-static void
-warn_defaults_to (location_t location, int opt, const char *gmsgid, ...)
-{
- diagnostic_info diagnostic;
- va_list ap;
- rich_location richloc (line_table, location);
-
- va_start (ap, gmsgid);
- diagnostic_set_info (&diagnostic, gmsgid, &ap, &richloc,
- flag_isoc99 ? DK_PEDWARN : DK_WARNING);
- diagnostic.option_index = opt;
- diagnostic_report_diagnostic (global_dc, &diagnostic);
- va_end (ap);
-}
-
/* Returns the smallest location != UNKNOWN_LOCATION in LOCATIONS,
considering only those c_declspec_words found in LIST, which
must be terminated by cdw_number_of_elements. */
@@ -6875,12 +6856,12 @@ grokdeclarator (const struct c_declarator *declarator,
else
{
if (name)
- warn_defaults_to (loc, OPT_Wimplicit_int,
- "type defaults to %<int%> in declaration "
- "of %qE", name);
+ permerror_opt (loc, OPT_Wimplicit_int,
+ "type defaults to %<int%> in declaration "
+ "of %qE", name);
else
- warn_defaults_to (loc, OPT_Wimplicit_int,
- "type defaults to %<int%> in type name");
+ permerror_opt (loc, OPT_Wimplicit_int,
+ "type defaults to %<int%> in type name");
}
}
@@ -10290,10 +10271,10 @@ start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
}
if (warn_about_return_type)
- warn_defaults_to (loc, flag_isoc99 ? OPT_Wimplicit_int
- : (warn_return_type > 0 ? OPT_Wreturn_type
- : OPT_Wimplicit_int),
- "return type defaults to %<int%>");
+ permerror_opt (loc, flag_isoc99 ? OPT_Wimplicit_int
+ : (warn_return_type > 0 ? OPT_Wreturn_type
+ : OPT_Wimplicit_int),
+ "return type defaults to %<int%>");
/* Make the init_value nonzero so pushdecl knows this is not tentative.
error_mark_node is replaced below (in pop_scope) with the BLOCK. */
@@ -10635,9 +10616,9 @@ store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
warn_if_shadowing (decl);
if (flag_isoc99)
- pedwarn (DECL_SOURCE_LOCATION (decl),
- OPT_Wimplicit_int, "type of %qD defaults to %<int%>",
- decl);
+ permerror_opt (DECL_SOURCE_LOCATION (decl),
+ OPT_Wimplicit_int, "type of %qD defaults to %<int%>",
+ decl);
else
warning_at (DECL_SOURCE_LOCATION (decl),
OPT_Wmissing_parameter_type,
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 055cca08f1c..eb7417fd9be 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -6182,6 +6182,7 @@ that have their own flag:
@gccoptlist{
-Wimplicit-function-declaration @r{(C)}
+-Wimplicit-int @r{(C)}
-Wint-conversion @r{(C)}
-Wnarrowing @r{(C++)}
}
@@ -6853,8 +6854,10 @@ This warning is enabled by @option{-Wall} in C++.
@opindex Wno-implicit-int
@item -Wno-implicit-int @r{(C and Objective-C only)}
This option controls warnings when a declaration does not specify a type.
-This warning is enabled by default in C99 and later dialects of C,
-and also by @option{-Wall}.
+This warning is enabled by default, as an error, in C99 and later
+dialects of C, and also by @option{-Wall}. The error can be downgraded
+to a warning using @option{-fpermissive} (along with certain other
+errors), or for this error alone, with @option{-Wno-error=implicit-int}.
This warning is upgraded to an error by @option{-pedantic-errors}.
diff --git a/gcc/testsuite/gcc.dg/Wimplicit-int-1.c b/gcc/testsuite/gcc.dg/Wimplicit-int-1.c
index 4a96e8f505d..fc7726c517e 100644
--- a/gcc/testsuite/gcc.dg/Wimplicit-int-1.c
+++ b/gcc/testsuite/gcc.dg/Wimplicit-int-1.c
@@ -1,5 +1,5 @@
/* { dg-do compile } */
-/* { dg-options "" } */
+/* { dg-options "-fpermissive" } */
static l; /* { dg-warning "type defaults to" } */
diff --git a/gcc/testsuite/gcc.dg/Wimplicit-int-1a.c b/gcc/testsuite/gcc.dg/Wimplicit-int-1a.c
new file mode 100644
index 00000000000..ef1835e2d3a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wimplicit-int-1a.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+static l; /* { dg-error "type defaults to" } */
+
+foo (a) /* { dg-error "return type defaults to" } */
+/* { dg-error "type of .a. defaults to .int." "type" { target *-*-* } .-1 } */
+{
+ auto p; /* { dg-error "type defaults to" } */
+ typedef bar; /* { dg-error "type defaults to" } */
+}
diff --git a/gcc/testsuite/gcc.dg/Wimplicit-int-4.c b/gcc/testsuite/gcc.dg/Wimplicit-int-4.c
index c9c6e8e5e95..99c61a76ecf 100644
--- a/gcc/testsuite/gcc.dg/Wimplicit-int-4.c
+++ b/gcc/testsuite/gcc.dg/Wimplicit-int-4.c
@@ -1,5 +1,5 @@
/* { dg-do compile } */
-/* { dg-options "-Wno-implicit -Wimplicit-int" } */
+/* { dg-options "-fpermissive -Wno-implicit -Wimplicit-int" } */
static l; /* { dg-warning "type defaults to" } */
diff --git a/gcc/testsuite/gcc.dg/Wimplicit-int-4a.c b/gcc/testsuite/gcc.dg/Wimplicit-int-4a.c
new file mode 100644
index 00000000000..920a088f02b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wimplicit-int-4a.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-Wno-implicit -Wimplicit-int" } */
+
+static l; /* { dg-error "type defaults to" } */
+
+foo (a) /* { dg-error "return type defaults to" } */
+/* { dg-error "type of .a. defaults to .int." "type" { target *-*-* } .-1 } */
+{
+ auto p; /* { dg-error "type defaults to" } */
+ typedef bar; /* { dg-error "type defaults to" } */
+}
diff --git a/gcc/testsuite/gcc.dg/gnu23-attr-syntax-2.c b/gcc/testsuite/gcc.dg/gnu23-attr-syntax-2.c
index ba60f7a095a..8943534f2b2 100644
--- a/gcc/testsuite/gcc.dg/gnu23-attr-syntax-2.c
+++ b/gcc/testsuite/gcc.dg/gnu23-attr-syntax-2.c
@@ -1,7 +1,7 @@
/* Test C23 attribute syntax. Invalid uses of attributes with GNU C
features. */
/* { dg-do compile } */
-/* { dg-options "-std=gnu23 -w" } */
+/* { dg-options "-fpermissive -std=gnu23 -w" } */
/* Attributes cannot be used as prefix attributes on old-style
parameter declarations or on function declarators with identifier
diff --git a/gcc/testsuite/gcc.dg/gnu23-attr-syntax-3.c b/gcc/testsuite/gcc.dg/gnu23-attr-syntax-3.c
new file mode 100644
index 00000000000..d73d6a3cfa8
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/gnu23-attr-syntax-3.c
@@ -0,0 +1,17 @@
+/* Test C23 attribute syntax. Invalid uses of attributes with GNU C
+ features. Non-permissive variant. */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu23 -w" } */
+
+/* Attributes cannot be used as prefix attributes on old-style
+ parameter declarations or on function declarators with identifier
+ lists (removed from C23). */
+
+void (*f(a, b) [[]])() int a, b; { } /* { dg-error "expected" } */
+
+void f(x, y) int x; [[]] int y; { } /* { dg-error "expected" } */
+/* { dg-error "type of 'y' defaults to 'int'" "" { target *-*-* } .-1 } */
+
+/* Nonempty attributes cannot be used as postfix attributes with
+ __auto_type. */
+__auto_type [[gnu::no_such_attr]] x = 1; /* { dg-error "'__auto_type' followed by" } */
diff --git a/gcc/testsuite/gcc.dg/noncompile/pr79758-2.c b/gcc/testsuite/gcc.dg/noncompile/pr79758-2.c
new file mode 100644
index 00000000000..e6a27f952ef
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/noncompile/pr79758-2.c
@@ -0,0 +1,6 @@
+/* PR c/79758 */
+/* { dg-do compile } */
+
+void fn1 (int[a]) { }; /* { dg-error "undeclared here" } */
+void fn1 (b) { }; /* { dg-error "redefinition" } */
+/* { dg-error "defaults to 'int'" "" { target *-*-* } .-1 } */
diff --git a/gcc/testsuite/gcc.dg/noncompile/pr79758.c b/gcc/testsuite/gcc.dg/noncompile/pr79758.c
index a31216068f0..e42a44380fa 100644
--- a/gcc/testsuite/gcc.dg/noncompile/pr79758.c
+++ b/gcc/testsuite/gcc.dg/noncompile/pr79758.c
@@ -1,5 +1,6 @@
/* PR c/79758 */
/* { dg-do compile } */
+/* { dg-additional-options "-fpermissive" } */
void fn1 (int[a]) { }; /* { dg-error "undeclared here" } */
void fn1 (b) { }; /* { dg-error "redefinition" } */
diff --git a/gcc/testsuite/gcc.dg/permerror-default.c b/gcc/testsuite/gcc.dg/permerror-default.c
index f37f9189e41..90f2220037c 100644
--- a/gcc/testsuite/gcc.dg/permerror-default.c
+++ b/gcc/testsuite/gcc.dg/permerror-default.c
@@ -10,13 +10,13 @@ implicit_function_declaration (void)
f1 (); /* { dg-error "'f1' \\\[-Wimplicit-function-declaration\\\]" } */
}
-extern implicit_int_1; /* { dg-warning "'implicit_int_1' \\\[-Wimplicit-int\\\]" } */
-typedef implicit_int_2; /* { dg-warning "'implicit_int_2' \\\[-Wimplicit-int\\\]" } */
-extern implicit_int_3 (void); /* { dg-warning "'implicit_int_3' \\\[-Wimplicit-int\\]" } */
-implicit_int_4 (i) /* { dg-warning "return type defaults to 'int' \\\[-Wimplicit-int\\\]" } */
-/* { dg-warning "type of 'i' defaults to 'int' \\\[-Wimplicit-int\\\]" "" { target *-*-*} .-1 } */
+extern implicit_int_1; /* { dg-error "'implicit_int_1' \\\[-Wimplicit-int\\\]" } */
+typedef implicit_int_2; /* { dg-error "'implicit_int_2' \\\[-Wimplicit-int\\\]" } */
+extern implicit_int_3 (void); /* { dg-error "'implicit_int_3' \\\[-Wimplicit-int\\]" } */
+implicit_int_4 (i) /* { dg-error "return type defaults to 'int' \\\[-Wimplicit-int\\\]" } */
+/* { dg-error "type of 'i' defaults to 'int' \\\[-Wimplicit-int\\\]" "" { target *-*-*} .-1 } */
{
- (const) 0; /* { dg-warning "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */
+ (const) 0; /* { dg-error "type defaults to 'int' in type name \\\[-Wimplicit-int\\\]" } */
}
extern int missing_parameter_type (i); /* { dg-warning "parameter names \\\(without types\\\) in function declaration\n" } */
diff --git a/gcc/testsuite/gcc.dg/permerror-system.c b/gcc/testsuite/gcc.dg/permerror-system.c
index e4da4a99e9a..60c65ffc1d4 100644
--- a/gcc/testsuite/gcc.dg/permerror-system.c
+++ b/gcc/testsuite/gcc.dg/permerror-system.c
@@ -10,6 +10,8 @@
/* { dg-error "'f1' \\\[-Wimplicit-function-declaration\\\]" "" { target *-*-* } 10 } */
+/* { dg-error "type of 'i' defaults to 'int' \\\[-Wimplicit-int\\\]" "" { target *-*-*} 16 } */
+
/* { dg-error "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" "" { target *-*-* } 29 } */
/* { dg-error "pointer/integer type mismatch in conditional expression \\\[-Wint-conversion\\\]" "" { target *-*-* } 30 } */
/* { dg-error "passing argument 1 of 'f2' makes pointer from integer without a cast \\\[-Wint-conversion\\\]" "" { target *-*-* } 31 } */
diff --git a/gcc/testsuite/gcc.dg/pr105635-2.c b/gcc/testsuite/gcc.dg/pr105635-2.c
new file mode 100644
index 00000000000..807eef0b7cd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr105635-2.c
@@ -0,0 +1,11 @@
+/* PR c/105635 */
+/* { dg-do compile } */
+/* { dg-options "-Wall" } */
+
+void foo (int, int[*]); /* { dg-message "previous declaration of 'foo' with type" } */
+
+foo (int x, int y) /* { dg-error "return type defaults to 'int'" } */
+{ /* { dg-warning "conflicting types for 'foo'" "" { target *-*-* } .-1 } */
+ /* { dg-message "declared here" "" { target *-*-* } .-2 } */
+ return (x >= 0) != (y < 0); /* { dg-warning "'return' with a value, in function returning void" } */
+}
diff --git a/gcc/testsuite/gcc.dg/pr105635.c b/gcc/testsuite/gcc.dg/pr105635.c
index aa02f593bfa..b98ea1b3c3b 100644
--- a/gcc/testsuite/gcc.dg/pr105635.c
+++ b/gcc/testsuite/gcc.dg/pr105635.c
@@ -1,6 +1,6 @@
/* PR c/105635 */
/* { dg-do compile } */
-/* { dg-options "-Wall" } */
+/* { dg-options "-fpermissive -Wall" } */
void foo (int, int[*]); /* { dg-message "previous declaration of 'foo' with type" } */
--
2.42.0
next prev parent reply other threads:[~2023-11-20 9:56 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-20 9:55 [PATCH v3 00/11] : More warnings as errors by default Florian Weimer
2023-11-20 9:55 ` [PATCH v3 01/11] aarch64: Avoid -Wincompatible-pointer-types warning in Linux unwinder Florian Weimer
2023-11-22 23:24 ` Joseph Myers
2023-11-20 9:55 ` [PATCH v3 02/11] aarch64: Call named function in gcc.target/aarch64/aapcs64/ice_1.c Florian Weimer
2023-11-22 23:25 ` Joseph Myers
2023-11-20 9:55 ` [PATCH v3 03/11] gm2: Add missing declaration of m2pim_M2RTS_Terminate to test Florian Weimer
2023-11-22 23:28 ` Joseph Myers
2023-11-20 9:56 ` [PATCH v3 04/11] Add tests for validating future C permerrors Florian Weimer
2023-11-30 17:31 ` Marek Polacek
2023-11-30 17:37 ` Florian Weimer
2023-11-30 17:39 ` Marek Polacek
2023-11-30 18:25 ` Jakub Jelinek
2023-11-20 9:56 ` [PATCH v3 05/11] c: Turn int-conversion warnings into permerrors Florian Weimer
2023-11-30 19:04 ` Marek Polacek
2023-11-30 19:46 ` Florian Weimer
2023-11-20 9:56 ` [PATCH v3 06/11] c: Turn -Wimplicit-function-declaration into a permerror Florian Weimer
2023-11-30 19:15 ` Marek Polacek
2023-12-01 15:54 ` c: Turn -Wimplicit-function-declaration into a permerror: Fix 'gcc.dg/gnu23-builtins-no-dfp-1.c' (was: [PATCH v3 06/11] c: Turn -Wimplicit-function-declaration into a permerror) Thomas Schwinge
2023-12-03 5:55 ` [committed] Fix gnu23-builtins-no-dfp Jeff Law
2023-12-03 7:41 ` Florian Weimer
2023-12-03 12:23 ` Thomas Schwinge
2023-12-03 20:57 ` Jeff Law
2023-12-05 9:31 ` [v2] c: Turn -Wimplicit-function-declaration into a permerror: Fix 'gcc.dg/gnu23-builtins-no-dfp-1.c' (was: [committed] Fix gnu23-builtins-no-dfp) Thomas Schwinge
2024-04-09 11:40 ` [PATCH v3 06/11] c: Turn -Wimplicit-function-declaration into a permerror Sebastian Huber
2024-04-09 12:10 ` Sam James
2024-04-09 12:26 ` Sebastian Huber
2024-04-09 12:56 ` Sam James
2023-11-20 9:56 ` Florian Weimer [this message]
2023-11-30 19:48 ` [PATCH v3 07/11] c: Turn -Wimplicit-int " Marek Polacek
2023-11-20 9:56 ` [PATCH v3 08/11] c: Do not ignore some forms of -Wimplicit-int in system headers Florian Weimer
2023-11-30 19:53 ` Marek Polacek
2023-11-20 9:56 ` [PATCH v3 09/11] c: Turn -Wreturn-mismatch into a permerror Florian Weimer
2023-11-23 17:32 ` Marek Polacek
2023-11-23 18:22 ` Florian Weimer
2023-11-30 16:17 ` Marek Polacek
2023-11-20 9:56 ` [PATCH v3 10/11] c: Turn -Wincompatible-pointer-types " Florian Weimer
2023-11-30 20:47 ` Marek Polacek
2023-11-30 21:02 ` Marek Polacek
2023-11-30 21:11 ` Florian Weimer
2023-11-30 21:15 ` Marek Polacek
2023-11-30 21:23 ` Jakub Jelinek
2023-11-30 21:27 ` Florian Weimer
2023-11-30 21:30 ` Jakub Jelinek
2023-11-30 21:36 ` Marek Polacek
2023-12-10 19:23 ` Jason Merrill
2023-12-05 9:37 ` Richard Earnshaw
2023-12-05 9:46 ` Florian Weimer
2023-12-05 10:11 ` Richard Earnshaw
2023-12-05 10:33 ` [PATCH] libgfortran: Fix -Wincompatible-pointer-types errors Jakub Jelinek
2023-12-05 10:47 ` Richard Earnshaw
2023-12-05 10:51 ` Jakub Jelinek
2023-12-05 10:57 ` Richard Earnshaw
2023-12-05 10:59 ` Jakub Jelinek
2023-12-05 17:35 ` Richard Earnshaw
2023-12-05 11:00 ` Florian Weimer
2023-12-05 13:35 ` Tobias Burnus
2023-12-06 12:04 ` [PATCH v3 10/11] c: Turn -Wincompatible-pointer-types into a permerror Prathamesh Kulkarni
2023-12-06 12:12 ` Florian Weimer
2023-11-20 9:56 ` [PATCH v3 11/11] c: Add new -Wdeclaration-missing-parameter-type permerror Florian Weimer
2023-11-20 19:12 ` Eric Gallager
2023-11-20 19:32 ` Florian Weimer
2023-11-30 21:10 ` Marek Polacek
2023-12-11 9:11 ` Florian Weimer
2023-11-23 0:54 ` [PATCH v3 00/11] : More warnings as errors by default Jeff Law
2023-11-23 1:04 ` Florian Weimer
2023-11-27 20:23 ` Sam James
2023-11-30 21:35 ` Florian Weimer
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