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Use an opt-out\ndiff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc\nindex 0b50aa214fd..f5fa9ead2be 100644\n--- a/gcc/config/loongarch/loongarch.cc\n+++ b/gcc/config/loongarch/loongarch.cc\n@@ -12165,7 +12165,8 @@ loongarch_generate_version_dispatcher_body (void *node_p)\n This assumes that FN1 and FN2 have the same signature. */\n \n bool\n-loongarch_option_same_function_versions (string_slice str1, string_slice str2)\n+loongarch_option_same_function_versions (string_slice str1, const_tree,\n+\t\t\t\t\t string_slice str2, const_tree)\n {\n loongarch_fmv_feature_mask feature_mask1;\n loongarch_fmv_feature_mask feature_mask2;\ndiff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc\nindex 96519c96a2b..3a0449e2ca8 100644\n--- a/gcc/config/riscv/riscv.cc\n+++ b/gcc/config/riscv/riscv.cc\n@@ -14823,7 +14823,8 @@ compare_fmv_features (const struct riscv_feature_bits &mask1,\n version. */\n \n bool\n-riscv_same_function_versions (string_slice v1, string_slice v2)\n+riscv_same_function_versions (string_slice v1, const_tree, string_slice v2,\n+\t\t\t const_tree)\n {\n struct riscv_feature_bits mask1, mask2;\n int prio1, prio2;\ndiff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi\nindex 2ddb11846ee..ce7ad16100d 100644\n--- a/gcc/doc/tm.texi\n+++ b/gcc/doc/tm.texi\n@@ -11012,9 +11012,15 @@ changed via the optimize attribute or pragma, see\n @code{TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE}\n @end deftypefn\n \n-@deftypefn {Target Hook} bool TARGET_OPTION_SAME_FUNCTION_VERSIONS (string_slice @var{fn1}, string_slice @var{fn2})\n+@deftypefn {Target Hook} bool TARGET_OPTION_SAME_FUNCTION_VERSIONS (string_slice @var{fn1}, const_tree @var{decl1}, string_slice @var{fn2}, const_tree @var{decl2})\n This target hook returns @code{true} if the target/target-version strings\n @var{fn1} and @var{fn2} imply the same function version.\n+\n+If @var{decl1} and @var{decl2} are non @code{NULL} then @var{fn1} and\n+@var{fn2} are from an earlier and a later declaration respectively, and the\n+hook diagnoses any version string incompatibility for these decls.\n+If the version strings are incompatible and the declarations can not be\n+merged, then hook emits an error.\n @end deftypefn\n \n @deftypefn {Target Hook} bool TARGET_OPTION_FUNCTIONS_B_RESOLVABLE_FROM_A (tree @var{decl_a}, tree @var{decl_v}, tree @var{base})\ndiff --git a/gcc/hooks.cc b/gcc/hooks.cc\nindex 5321142495b..06aebd3daaa 100644\n--- a/gcc/hooks.cc\n+++ b/gcc/hooks.cc\n@@ -595,7 +595,10 @@ hook_stringslice_locationtptr_true (string_slice, location_t *)\n }\n \n bool\n-hook_stringslice_stringslice_unreachable (string_slice, string_slice)\n+hook_stringslice_consttree_stringslice_consttree_unreachable (string_slice,\n+\t\t\t\t\t\t\t const_tree,\n+\t\t\t\t\t\t\t string_slice,\n+\t\t\t\t\t\t\t const_tree)\n {\n gcc_unreachable ();\n }\ndiff --git a/gcc/hooks.h b/gcc/hooks.h\nindex a7021f532a5..1d8630c8349 100644\n--- a/gcc/hooks.h\n+++ b/gcc/hooks.h\n@@ -139,6 +139,6 @@ extern opt_machine_mode hook_optmode_mode_uhwi_none (machine_mode,\n \t\t\t\t\t\t unsigned HOST_WIDE_INT);\n \n extern bool hook_stringslice_locationtptr_true (string_slice, location_t *);\n-extern bool hook_stringslice_stringslice_unreachable (string_slice, string_slice);\n+extern bool hook_stringslice_consttree_stringslice_consttree_unreachable (string_slice, const_tree, string_slice, const_tree);\n \n #endif\ndiff --git a/gcc/target.def b/gcc/target.def\nindex d695f38fbcc..b994ccef215 100644\n--- a/gcc/target.def\n+++ b/gcc/target.def\n@@ -6971,14 +6971,22 @@ changed via the optimize attribute or pragma, see\\n\\\n void, (void),\n hook_void_void)\n \n-/* This function returns true if FN1 and FN2 define the same version of a\n- function. */\n+/* This function returns true if FN1 and FN2 define the same version\n+ of a function.\n+ If DECL1 and DECL2 is not-null then emit a diagnostic if the versions do\n+ imply the same version, but are not mergeable. */\n DEFHOOK\n (same_function_versions,\n \"This target hook returns @code{true} if the target/target-version strings\\n\\\n-@var{fn1} and @var{fn2} imply the same function version.\",\n- bool, (string_slice fn1, string_slice fn2),\n- hook_stringslice_stringslice_unreachable)\n+@var{fn1} and @var{fn2} imply the same function version.\\n\\\n+\\n\\\n+If @var{decl1} and @var{decl2} are non @code{NULL} then @var{fn1} and\\n\\\n+@var{fn2} are from an earlier and a later declaration respectively, and the\\n\\\n+hook diagnoses any version string incompatibility for these decls.\\n\\\n+If the version strings are incompatible and the declarations can not be\\n\\\n+merged, then hook emits an error.\",\n+ bool, (string_slice fn1, const_tree decl1, string_slice fn2, const_tree decl2),\n+ hook_stringslice_consttree_stringslice_consttree_unreachable)\n \n /* Checks if we can be certain that function DECL_A could resolve DECL_B. */\n DEFHOOK\ndiff --git a/gcc/tree.cc b/gcc/tree.cc\nindex 8dcb59dc875..69f44846b7f 100644\n--- a/gcc/tree.cc\n+++ b/gcc/tree.cc\n@@ -15610,7 +15610,8 @@ disjoint_version_decls (tree fn1, tree fn2)\n \t for (string_slice v1 : fn1_versions)\n \t\t{\n \t\t for (string_slice v2 : fn2_versions)\n-\t\t if (targetm.target_option.same_function_versions (v1, v2))\n+\t\t if (targetm.target_option.same_function_versions (v1, NULL,\n+\t\t\t\t\t\t\t\t v2, NULL))\n \t\t return false;\n \t\t}\n \t return true;\n@@ -15628,7 +15629,8 @@ disjoint_version_decls (tree fn1, tree fn2)\n \t if (!v2.is_valid ())\n \t\tv2 = \"default\";\n \t for (string_slice v1 : fn1_versions)\n-\t\tif (targetm.target_option.same_function_versions (v1, v2))\n+\t\tif (targetm.target_option.same_function_versions (v1, NULL, v2,\n+\t\t\t\t\t\t\t\t NULL))\n \t\t return false;\n \t return true;\n \t }\n@@ -15647,7 +15649,7 @@ disjoint_version_decls (tree fn1, tree fn2)\n \t if (!v2.is_valid ())\n \t v2 = \"default\";\n \n-\t if (targetm.target_option.same_function_versions (v1, v2))\n+\t if (targetm.target_option.same_function_versions (v1, NULL, v2, NULL))\n \t return false;\n \n \t return true;\n@@ -15695,30 +15697,32 @@ diagnose_versioned_decls (tree old_decl, tree new_decl)\n the two sets of target_clones imply the same set of versions. */\n if (old_target_clones_attr && new_target_clones_attr)\n {\n- auto_vec fn1_versions = get_clone_versions (old_decl);\n- auto_vec fn2_versions = get_clone_versions (new_decl);\n+ auto_vec old_versions = get_clone_versions (old_decl);\n+ auto_vec new_versions = get_clone_versions (new_decl);\n \n bool mergeable = true;\n \n- if (fn1_versions.length () != fn2_versions.length ())\n+ if (old_versions.length () != new_versions.length ())\n \tmergeable = false;\n \n /* Check both inclusion directions. */\n- for (auto fn1v : fn1_versions)\n+ for (auto oldv: old_versions)\n \t{\n \t bool matched = false;\n-\t for (auto fn2v : fn2_versions)\n-\t if (targetm.target_option.same_function_versions (fn1v, fn2v))\n+\t for (auto newv: new_versions)\n+\t if (targetm.target_option.same_function_versions (oldv, old_decl,\n+\t\t\t\t\t\t\t newv, new_decl))\n \t matched = true;\n \t if (!matched)\n \t mergeable = false;\n \t}\n \n- for (auto fn2v : fn2_versions)\n+ for (auto newv: new_versions)\n \t{\n \t bool matched = false;\n-\t for (auto fn1v : fn1_versions)\n-\t if (targetm.target_option.same_function_versions (fn1v, fn2v))\n+\t for (auto oldv: old_versions)\n+\t if (targetm.target_option.same_function_versions (oldv, old_decl,\n+\t\t\t\t\t\t\t newv, new_decl))\n \t matched = true;\n \t if (!matched)\n \t mergeable = false;\n@@ -15767,9 +15771,9 @@ diagnose_versioned_decls (tree old_decl, tree new_decl)\n return true;\n }\n \n- /* The only remaining case is two target_version annotated decls. Must\n- be mergeable as otherwise are distinct. */\n- return false;\n+ /* The only remaining case is two target_version annotated decls. */\n+ return !targetm.target_option.same_function_versions\n+\t (old_target_attr, old_decl, new_target_attr, new_decl);\n }\n \n void\n","prefixes":["v6","1/2"]}