cpp,qt: Remove C++ and Qt bindings

* README: Update.
* configure.ac: Remove checks, variables and file generations related to
the C++/Qt bindings. Remove cpp and qt* from available_languages and
default_languages.
* lang/Makefile.am (DIST_SUBDIRS): Remove cpp and qt.
* lang/cpp, lang/qt: Remove.
* m4/ax_check_compile_flag.m4, m4/ax_cxx_compile_stdcxx.m4,
m4/ax_gcc_func_attribute.m4, m4/pkg.m4, m4/qt5.m4, m4/qt6.m4: Remove.
--

The C++ and Qt bindings have been moved to separate Git repositories:
gpgmepp and gpgmeqt.

GnuPG-bug-id: 7262

1 files changed, 0 insertions, 242 deletions

diff --git a/m4/ax_gcc_func_attribute.m4 b/m4/ax_gcc_func_attribute.m4
deleted file mode 100644
index fa4e089d..00000000
--- a/m4/ax_gcc_func_attribute.m4
+++ /dev/null
@@ -1,242 +0,0 @@
-# ===========================================================================
-#  https://www.gnu.org/software/autoconf-archive/ax_gcc_func_attribute.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_GCC_FUNC_ATTRIBUTE(ATTRIBUTE)
-#
-# DESCRIPTION
-#
-#   This macro checks if the compiler supports one of GCC's function
-#   attributes; many other compilers also provide function attributes with
-#   the same syntax. Compiler warnings are used to detect supported
-#   attributes as unsupported ones are ignored by default so quieting
-#   warnings when using this macro will yield false positives.
-#
-#   The ATTRIBUTE parameter holds the name of the attribute to be checked.
-#
-#   If ATTRIBUTE is supported define HAVE_FUNC_ATTRIBUTE_<ATTRIBUTE>.
-#
-#   The macro caches its result in the ax_cv_have_func_attribute_<attribute>
-#   variable.
-#
-#   The macro currently supports the following function attributes:
-#
-#    alias
-#    aligned
-#    alloc_size
-#    always_inline
-#    artificial
-#    cold
-#    const
-#    constructor
-#    constructor_priority for constructor attribute with priority
-#    deprecated
-#    destructor
-#    dllexport
-#    dllimport
-#    error
-#    externally_visible
-#    fallthrough
-#    flatten
-#    format
-#    format_arg
-#    gnu_format
-#    gnu_inline
-#    hot
-#    ifunc
-#    leaf
-#    malloc
-#    noclone
-#    noinline
-#    nonnull
-#    noreturn
-#    nothrow
-#    optimize
-#    pure
-#    sentinel
-#    sentinel_position
-#    unused
-#    used
-#    visibility
-#    warning
-#    warn_unused_result
-#    weak
-#    weakref
-#
-#   Unsupported function attributes will be tested with a prototype
-#   returning an int and not accepting any arguments and the result of the
-#   check might be wrong or meaningless so use with care.
-#
-# LICENSE
-#
-#   Copyright (c) 2013 Gabriele Svelto <[email protected]>
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved.  This file is offered as-is, without any
-#   warranty.
-
-#serial 13
-
-AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
-    AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1])
-
-    AC_CACHE_CHECK([for __attribute__(($1))], [ac_var], [
-        AC_LINK_IFELSE([AC_LANG_PROGRAM([
-            m4_case([$1],
-                [alias], [
-                    int foo( void ) { return 0; }
-                    int bar( void ) __attribute__(($1("foo")));
-                ],
-                [aligned], [
-                    int foo( void ) __attribute__(($1(32)));
-                ],
-                [alloc_size], [
-                    void *foo(int a) __attribute__(($1(1)));
-                ],
-                [always_inline], [
-                    inline __attribute__(($1)) int foo( void ) { return 0; }
-                ],
-                [artificial], [
-                    inline __attribute__(($1)) int foo( void ) { return 0; }
-                ],
-                [cold], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [const], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [constructor_priority], [
-                    int foo( void ) __attribute__((__constructor__(65535/2)));
-                ],
-                [constructor], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [deprecated], [
-                    int foo( void ) __attribute__(($1("")));
-                ],
-                [destructor], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [dllexport], [
-                    __attribute__(($1)) int foo( void ) { return 0; }
-                ],
-                [dllimport], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [error], [
-                    int foo( void ) __attribute__(($1("")));
-                ],
-                [externally_visible], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [fallthrough], [
-                    void foo( int x ) {switch (x) { case 1: __attribute__(($1)); case 2: break ; }};
-                ],
-                [flatten], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [format], [
-                    int foo(const char *p, ...) __attribute__(($1(printf, 1, 2)));
-                ],
-                [gnu_format], [
-                    int foo(const char *p, ...) __attribute__((format(gnu_printf, 1, 2)));
-                ],
-                [format_arg], [
-                    char *foo(const char *p) __attribute__(($1(1)));
-                ],
-                [gnu_inline], [
-                    inline __attribute__(($1)) int foo( void ) { return 0; }
-                ],
-                [hot], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [ifunc], [
-                    int my_foo( void ) { return 0; }
-                    static int (*resolve_foo(void))(void) { return my_foo; }
-                    int foo( void ) __attribute__(($1("resolve_foo")));
-                ],
-                [leaf], [
-                    __attribute__(($1)) int foo( void ) { return 0; }
-                ],
-                [malloc], [
-                    void *foo( void ) __attribute__(($1));
-                ],
-                [noclone], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [noinline], [
-                    __attribute__(($1)) int foo( void ) { return 0; }
-                ],
-                [nonnull], [
-                    int foo(char *p) __attribute__(($1(1)));
-                ],
-                [noreturn], [
-                    void foo( void ) __attribute__(($1));
-                ],
-                [nothrow], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [optimize], [
-                    __attribute__(($1(3))) int foo( void ) { return 0; }
-                ],
-                [pure], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [sentinel], [
-                    int foo(void *p, ...) __attribute__(($1));
-                ],
-                [sentinel_position], [
-                    int foo(void *p, ...) __attribute__(($1(1)));
-                ],
-                [returns_nonnull], [
-                    void *foo( void ) __attribute__(($1));
-                ],
-                [unused], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [used], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [visibility], [
-                    int foo_def( void ) __attribute__(($1("default")));
-                    int foo_hid( void ) __attribute__(($1("hidden")));
-                    int foo_int( void ) __attribute__(($1("internal")));
-                    int foo_pro( void ) __attribute__(($1("protected")));
-                ],
-                [warning], [
-                    int foo( void ) __attribute__(($1("")));
-                ],
-                [warn_unused_result], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [weak], [
-                    int foo( void ) __attribute__(($1));
-                ],
-                [weakref], [
-                    static int foo( void ) { return 0; }
-                    static int bar( void ) __attribute__(($1("foo")));
-                ],
-                [
-                 m4_warn([syntax], [Unsupported attribute $1, the test may fail])
-                 int foo( void ) __attribute__(($1));
-                ]
-            )], [])
-            ],
-            dnl GCC doesn't exit with an error if an unknown attribute is
-            dnl provided but only outputs a warning, so accept the attribute
-            dnl only if no warning were issued.
-            [AS_IF([grep -- -Wattributes conftest.err],
-                [AS_VAR_SET([ac_var], [no])],
-                [AS_VAR_SET([ac_var], [yes])])],
-            [AS_VAR_SET([ac_var], [no])])
-    ])
-
-    AS_IF([test yes = AS_VAR_GET([ac_var])],
-        [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_FUNC_ATTRIBUTE_$1), 1,
-            [Define to 1 if the system has the `$1' function attribute])], [])
-
-    AS_VAR_POPDEF([ac_var])
-])