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Diffstat (limited to 'gcc/c-family/c-cppbuiltin.cc')
-rw-r--r--gcc/c-family/c-cppbuiltin.cc77
1 files changed, 64 insertions, 13 deletions
diff --git a/gcc/c-family/c-cppbuiltin.cc b/gcc/c-family/c-cppbuiltin.cc
index 4aea902..6b22f9e 100644
--- a/gcc/c-family/c-cppbuiltin.cc
+++ b/gcc/c-family/c-cppbuiltin.cc
@@ -913,23 +913,42 @@ c_cpp_builtins (cpp_reader *pfile)
/* encoding definitions used by users and libraries */
builtin_define_with_value ("__GNUC_EXECUTION_CHARSET_NAME",
- cpp_get_narrow_charset_name (pfile), 1);
+ cpp_get_narrow_charset_name (pfile), 1);
builtin_define_with_value ("__GNUC_WIDE_EXECUTION_CHARSET_NAME",
- cpp_get_wide_charset_name (pfile), 1);
-
+ cpp_get_wide_charset_name (pfile), 1);
if (c_dialect_cxx ())
- {
- int major;
- parse_basever (&major, NULL, NULL);
- cpp_define_formatted (pfile, "__GNUG__=%d", major);
- }
+ {
+ int major;
+ parse_basever (&major, NULL, NULL);
+ cpp_define_formatted (pfile, "__GNUG__=%d", major);
+ }
/* For stddef.h. They require macros defined in c-common.cc. */
c_stddef_cpp_builtins ();
+ /* Variant of cpp_define which arranges for diagnostics on user #define
+ or #undef of the macros. */
+ auto cpp_define_warn = [] (cpp_reader *pfile, const char *def)
+ {
+ const char *end = strchr (def, '=');
+ cpp_define (pfile, def);
+ cpp_warn (pfile, def, end ? end - def : strlen (def));
+ };
+
if (c_dialect_cxx ())
{
+ /* Treat all cpp_define calls in this block for macros starting
+ with __cpp_ (for C++20 and later) or __STDCPP_ as cpp_define_warn. */
+ auto cpp_define = [=] (cpp_reader *pfile, const char *def)
+ {
+ if ((cxx_dialect >= cxx20 && startswith (def, "__cpp_"))
+ || startswith (def, "__STDCPP_"))
+ cpp_define_warn (pfile, def);
+ else
+ ::cpp_define (pfile, def);
+ };
+
if (flag_weak && SUPPORTS_ONE_ONLY)
cpp_define (pfile, "__GXX_WEAK__=1");
else
@@ -1090,52 +1109,76 @@ c_cpp_builtins (cpp_reader *pfile)
cpp_define (pfile, "__cpp_constexpr_exceptions=202411L");
cpp_define (pfile, "__cpp_static_assert=202306L");
cpp_define (pfile, "__cpp_placeholder_variables=202306L");
- cpp_define (pfile, "__cpp_structured_bindings=202403L");
+ cpp_define (pfile, "__cpp_structured_bindings=202411L");
cpp_define (pfile, "__cpp_deleted_function=202403L");
cpp_define (pfile, "__cpp_variadic_friend=202403L");
cpp_define (pfile, "__cpp_pack_indexing=202311L");
cpp_define (pfile, "__cpp_pp_embed=202502L");
cpp_define (pfile, "__cpp_constexpr_virtual_inheritance=202506L");
cpp_define (pfile, "__cpp_trivial_relocatability=202502L");
+ cpp_define (pfile, "__cpp_expansion_statements=202506L");
}
if (flag_concepts && cxx_dialect > cxx14)
cpp_define (pfile, "__cpp_concepts=202002L");
+ else if (cxx_dialect >= cxx20)
+ cpp_warn (pfile, "__cpp_concepts");
if (flag_contracts)
{
cpp_define (pfile, "__cpp_contracts=201906L");
cpp_define (pfile, "__cpp_contracts_literal_semantics=201906L");
cpp_define (pfile, "__cpp_contracts_roles=201906L");
}
+ else if (cxx_dialect >= cxx26)
+ cpp_warn (pfile, "__cpp_contracts");
if (flag_modules)
/* The std-defined value is 201907L, but I don't think we can
claim victory yet. 201810 is the p1103 date. */
cpp_define (pfile, "__cpp_modules=201810L");
+ else if (cxx_dialect >= cxx20)
+ cpp_warn (pfile, "__cpp_modules");
if (flag_coroutines)
cpp_define (pfile, "__cpp_impl_coroutine=201902L"); /* n4861, DIS */
+ else if (cxx_dialect >= cxx20)
+ cpp_warn (pfile, "__cpp_impl_coroutine");
if (flag_tm)
/* Use a value smaller than the 201505 specified in
the TS, since we don't yet support atomic_cancel. */
cpp_define (pfile, "__cpp_transactional_memory=201500L");
if (flag_sized_deallocation)
cpp_define (pfile, "__cpp_sized_deallocation=201309L");
+ else if (cxx_dialect >= cxx20)
+ cpp_warn (pfile, "__cpp_sized_deallocation");
if (aligned_new_threshold)
{
cpp_define (pfile, "__cpp_aligned_new=201606L");
cpp_define_formatted (pfile, "__STDCPP_DEFAULT_NEW_ALIGNMENT__=%d",
aligned_new_threshold);
}
+ else if (cxx_dialect >= cxx20)
+ cpp_warn (pfile, "__cpp_aligned_new");
+ if (cxx_dialect >= cxx17)
+ cpp_warn (pfile, "__STDCPP_DEFAULT_NEW_ALIGNMENT__");
if (flag_new_ttp)
cpp_define (pfile, "__cpp_template_template_args=201611L");
+ else if (cxx_dialect >= cxx20)
+ cpp_warn (pfile, "__cpp_template_template_args");
if (flag_threadsafe_statics)
cpp_define (pfile, "__cpp_threadsafe_static_init=200806L");
+ else if (cxx_dialect >= cxx20)
+ cpp_warn (pfile, "__cpp_threadsafe_static_init");
if (flag_char8_t)
cpp_define (pfile, "__cpp_char8_t=202207L");
+ else if (cxx_dialect >= cxx20)
+ cpp_warn (pfile, "__cpp_char8_t");
#ifndef THREAD_MODEL_SPEC
/* Targets that define THREAD_MODEL_SPEC need to define
__STDCPP_THREADS__ in their config/XXX/XXX-c.c themselves. */
if (cxx_dialect >= cxx11 && strcmp (thread_model, "single") != 0)
cpp_define (pfile, "__STDCPP_THREADS__=1");
+ else
#endif
+ if (cxx_dialect >= cxx11)
+ cpp_warn (pfile, "__STDCPP_THREADS__");
if (flag_implicit_constexpr)
cpp_define (pfile, "__cpp_implicit_constexpr=20211111L");
}
@@ -1284,16 +1327,22 @@ c_cpp_builtins (cpp_reader *pfile)
for (int i = 0; i < NUM_FLOATN_NX_TYPES; i++)
{
- if (FLOATN_NX_TYPE_NODE (i) == NULL_TREE)
- continue;
if (c_dialect_cxx ()
&& cxx_dialect > cxx20
&& !floatn_nx_types[i].extended)
{
char name[sizeof ("__STDCPP_FLOAT128_T__=1")];
+ if (FLOATN_NX_TYPE_NODE (i) == NULL_TREE)
+ {
+ sprintf (name, "__STDCPP_FLOAT%d_T__", floatn_nx_types[i].n);
+ cpp_warn (pfile, name);
+ continue;
+ }
sprintf (name, "__STDCPP_FLOAT%d_T__=1", floatn_nx_types[i].n);
- cpp_define (pfile, name);
+ cpp_define_warn (pfile, name);
}
+ else if (FLOATN_NX_TYPE_NODE (i) == NULL_TREE)
+ continue;
char prefix[20], csuffix[20];
sprintf (prefix, "FLT%d%s", floatn_nx_types[i].n,
floatn_nx_types[i].extended ? "X" : "");
@@ -1305,10 +1354,12 @@ c_cpp_builtins (cpp_reader *pfile)
if (bfloat16_type_node)
{
if (c_dialect_cxx () && cxx_dialect > cxx20)
- cpp_define (pfile, "__STDCPP_BFLOAT16_T__=1");
+ cpp_define_warn (pfile, "__STDCPP_BFLOAT16_T__=1");
builtin_define_float_constants ("BFLT16", "BF16", "%s",
"BF16", bfloat16_type_node);
}
+ else if (cxx_dialect >= cxx23)
+ cpp_warn (pfile, "__STDCPP_BFLOAT16_T__");
/* For float.h. */
if (targetm.decimal_float_supported_p ())
generated by cgit v1.1 at 2025-09-27 09:18:16 +0000