libgccjit: Accept more flags

Author: antoyo

gcc/jit/dummy-frontend.cc

@@ -2029,6 +2029,46 @@ jit_langhook_type_promotes_to (tree type)
   return type;
 }
 
+/* Implementation of LANG_HOOKS_OPTION_LANG_MASK.
+
+   Without this, libgccjit has no language mask at all, so only Common and
+   Target options are accepted: everything else is rejected with
+   "command-line option '...' is valid for <languages> but not for
+   <nothing>".  The options that make sense for a client of libgccjit are
+   marked with the LibGCCJIT language in the relevant lang.opt.  */
+
+static unsigned int
+jit_langhook_option_lang_mask (void)
+{
+  return CL_LibGCCJIT;
+}
+
+#undef LANG_HOOKS_OPTION_LANG_MASK
+#define LANG_HOOKS_OPTION_LANG_MASK jit_langhook_option_lang_mask
+
+/* Implementation of LANG_HOOKS_HANDLE_OPTION.
+
+   Every option libgccjit accepts has a Var(...) in the .opt file, so by the
+   time this is called handle_option has already stored the value and there is
+   nothing language-specific left to do.  The hook still has to exist and
+   return true: the default lhd_handle_option returns false, which would make
+   read_cmdline_option report the option as unrecognized.  */
+
+static bool
+jit_langhook_handle_option (
+  size_t code ATTRIBUTE_UNUSED,
+  const char *arg ATTRIBUTE_UNUSED,
+  HOST_WIDE_INT value ATTRIBUTE_UNUSED,
+  int kind ATTRIBUTE_UNUSED,
+  location_t loc ATTRIBUTE_UNUSED,
+  const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
+{
+  return true;
+}
+
+#undef LANG_HOOKS_HANDLE_OPTION
+#define LANG_HOOKS_HANDLE_OPTION jit_langhook_handle_option
+
 #undef LANG_HOOKS_EH_PERSONALITY
 #define LANG_HOOKS_EH_PERSONALITY jit_langhook_eh_personality
 

gcc/jit/lang.opt

@@ -0,0 +1,61 @@
+; Options for libgccjit.
+; Copyright (C) 2026 Free Software Foundation, Inc.
+;
+; This file is part of GCC.
+;
+; GCC is free software; you can redistribute it and/or modify it under
+; the terms of the GNU General Public License as published by the Free
+; Software Foundation; either version 3, or (at your option) any later
+; version.
+;
+; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+; WARRANTY; without even the implied warranty of MERCHANTABILITY or
+; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+; for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with GCC; see the file COPYING3.  If not see
+; <http://www.gnu.org/licenses/>.
+
+; See the GCC internals manual for a description of this file's format.
+
+; Please try to keep this file in ASCII collating order.
+
+; libgccjit has no source language of its own, so the options listed here are
+; not front end options: they are the language-specific options that a client
+; of libgccjit can meaningfully pass to
+; gcc_jit_context_add_command_line_option.  They are all warnings that are
+; enabled by default and that can be emitted from language-independent
+; middle-end or target code, so libgccjit can trigger them; without a record
+; here there is no way for a client to turn them off.
+
+Language
+LibGCCJIT
+
+Wif-not-aligned
+LibGCCJIT
+; Documented in C
+
+Wpsabi
+LibGCCJIT
+; Documented in C
+
+Wstringop-overflow=
+LibGCCJIT
+; Documented in C
+
+Wstringop-overread
+LibGCCJIT
+; Documented in C
+
+Wstringop-truncation
+LibGCCJIT
+; Documented in C
+
+Wsync-nand
+LibGCCJIT
+; Documented in C
+
+Wunused-result
+LibGCCJIT
+; Documented in C

gcc/jit/lang.opt.urls

@@ -0,0 +1,22 @@
+; Autogenerated by regenerate-opt-urls.py from gcc/jit/lang.opt and generated HTML
+
+Wif-not-aligned
+UrlSuffix(gcc/Warning-Options.html#index-Wif-not-aligned)
+
+Wpsabi
+UrlSuffix(gcc/Warning-Options.html#index-Wno-psabi)
+
+Wstringop-overflow=
+UrlSuffix(gcc/Warning-Options.html#index-Wno-stringop-overflow)
+
+Wstringop-overread
+UrlSuffix(gcc/Warning-Options.html#index-Wno-stringop-overread)
+
+Wstringop-truncation
+UrlSuffix(gcc/Warning-Options.html#index-Wno-stringop-truncation)
+
+Wsync-nand
+UrlSuffix(gcc/Warning-Options.html#index-Wno-sync-nand)
+
+Wunused-result
+UrlSuffix(gcc/Warning-Options.html#index-Wno-unused-result)

gcc/opts.h

@@ -164,12 +164,17 @@ extern const struct cl_var cl_vars[];
 extern const char *const lang_names[];
 extern const unsigned int cl_lang_count;
 
-#define CL_PARAMS               (1U << 16) /* Fake entry.  Used to display --param info with --help.  */
-#define CL_WARNING		(1U << 17) /* Enables an (optional) warning message.  */
-#define CL_OPTIMIZATION		(1U << 18) /* Enables an (optional) optimization.  */
-#define CL_DRIVER		(1U << 19) /* Driver option.  */
-#define CL_TARGET		(1U << 20) /* Target-specific option.  */
-#define CL_COMMON		(1U << 21) /* Language-independent.  */
+/* Bits 0 to cl_lang_count - 1 are reserved for the languages declared by the
+   Language records in the .opt files; see CL_LANG_ALL in options.h.  When a
+   front end is added, every macro below has to be shifted up by one bit to
+   make room for it.  */
+
+#define CL_PARAMS               (1U << 17) /* Fake entry.  Used to display --param info with --help.  */
+#define CL_WARNING		(1U << 18) /* Enables an (optional) warning message.  */
+#define CL_OPTIMIZATION		(1U << 19) /* Enables an (optional) optimization.  */
+#define CL_DRIVER		(1U << 20) /* Driver option.  */
+#define CL_TARGET		(1U << 21) /* Target-specific option.  */
+#define CL_COMMON		(1U << 22) /* Language-independent.  */
 
 #define CL_MIN_OPTION_CLASS	CL_PARAMS
 #define CL_MAX_OPTION_CLASS	CL_COMMON
@@ -179,11 +184,22 @@ extern const unsigned int cl_lang_count;
    This distinction is important because --help will not list options
    which only have these higher bits set.  */
 
-#define CL_JOINED		(1U << 22) /* If takes joined argument.  */
-#define CL_SEPARATE		(1U << 23) /* If takes a separate argument.  */
-#define CL_UNDOCUMENTED		(1U << 24) /* Do not output with --help.  */
-#define CL_NO_DWARF_RECORD	(1U << 25) /* Do not add to producer string.  */
-#define CL_PCH_IGNORE		(1U << 26) /* Do compare state for pch.  */
+#define CL_JOINED		(1U << 23) /* If takes joined argument.  */
+#define CL_SEPARATE		(1U << 24) /* If takes a separate argument.  */
+#define CL_UNDOCUMENTED		(1U << 25) /* Do not output with --help.  */
+#define CL_NO_DWARF_RECORD	(1U << 26) /* Do not add to producer string.  */
+#define CL_PCH_IGNORE		(1U << 27) /* Do compare state for pch.  */
+
+/* The language bits must not collide with the option class and attribute bits
+   defined above; adding a Language record to a .opt file without shifting
+   those macros up would give a language the same bit as CL_PARAMS.
+   optc-gen.awk emits an equivalent #error into options.cc, but that only
+   covers the one generated file, so state the invariant here too, where the
+   bits are actually laid out.  CL_LANG_ALL comes from the generated
+   options.h, which a few users of this header include only afterwards.  */
+#ifdef CL_LANG_ALL
+STATIC_ASSERT ((CL_LANG_ALL & CL_MIN_OPTION_CLASS) == 0);
+#endif
 
 /* Flags for an enumerated option argument.  */
 #define CL_ENUM_CANONICAL	(1 << 0) /* Canonical for this value.  */