Rollup merge of #135767 - tdittr:fn_ptr_calling_conventions-in-deps, r=compiler-errors

Future incompatibility warning `unsupported_fn_ptr_calling_conventions`: Also warn in dependencies

Tracking issue: https://github.com/rust-lang/rust/issues/130260

As discussed [in the previous PR](https://github.com/rust-lang/rust/pull/128784/files#r1752533758) now the future incompatibility warning is enabled in dependencies.

The warning was added in 1.83, while this change will get into stable in 1.86, which gives crate authors three versions to fix the warning.

r? compiler-errors

11 files changed, 609 insertions, 7 deletions

diff --git a/compiler/rustc_lint_defs/src/builtin.rs b/compiler/rustc_lint_defs/src/builtin.rs
index 97850a2afc1..3d63ea82053 100644
--- a/compiler/rustc_lint_defs/src/builtin.rs
+++ b/compiler/rustc_lint_defs/src/builtin.rs
@@ -3782,7 +3782,7 @@ declare_lint! {
     Warn,
     "use of unsupported calling convention for function pointer",
     @future_incompatible = FutureIncompatibleInfo {
-        reason: FutureIncompatibilityReason::FutureReleaseErrorDontReportInDeps,
+        reason: FutureIncompatibilityReason::FutureReleaseErrorReportInDeps,
         reference: "issue #130260 <https://github.com/rust-lang/rust/issues/130260>",
     };
 }
diff --git a/tests/ui/abi/unsupported.aarch64.stderr b/tests/ui/abi/unsupported.aarch64.stderr
index 01f071f1f31..c11cc4e2d52 100644
--- a/tests/ui/abi/unsupported.aarch64.stderr
+++ b/tests/ui/abi/unsupported.aarch64.stderr
@@ -206,3 +206,113 @@ LL | extern "C-cmse-nonsecure-entry" fn cmse_entry() {}
 error: aborting due to 19 previous errors; 10 warnings emitted
 
 For more information about this error, try `rustc --explain E0570`.
+Future incompatibility report: Future breakage diagnostic:
+warning: the calling convention "ptx-kernel" is not supported on this target
+  --> $DIR/unsupported.rs:35:15
+   |
+LL | fn ptx_ptr(f: extern "ptx-kernel" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "aapcs" is not supported on this target
+  --> $DIR/unsupported.rs:51:17
+   |
+LL | fn aapcs_ptr(f: extern "aapcs" fn()) {
+   |                 ^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "msp430-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:73:18
+   |
+LL | fn msp430_ptr(f: extern "msp430-interrupt" fn()) {
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "avr-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:83:15
+   |
+LL | fn avr_ptr(f: extern "avr-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "riscv-interrupt-m" is not supported on this target
+  --> $DIR/unsupported.rs:96:17
+   |
+LL | fn riscv_ptr(f: extern "riscv-interrupt-m" fn()) {
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "x86-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:118:15
+   |
+LL | fn x86_ptr(f: extern "x86-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "thiscall" is not supported on this target
+  --> $DIR/unsupported.rs:141:20
+   |
+LL | fn thiscall_ptr(f: extern "thiscall" fn()) {
+   |                    ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "stdcall" is not supported on this target
+  --> $DIR/unsupported.rs:167:19
+   |
+LL | fn stdcall_ptr(f: extern "stdcall" fn()) {
+   |                   ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-call" is not supported on this target
+  --> $DIR/unsupported.rs:187:21
+   |
+LL | fn cmse_call_ptr(f: extern "C-cmse-nonsecure-call" fn()) {
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-entry" is not supported on this target
+  --> $DIR/unsupported.rs:195:22
+   |
+LL | fn cmse_entry_ptr(f: extern "C-cmse-nonsecure-entry" fn()) {
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
diff --git a/tests/ui/abi/unsupported.arm.stderr b/tests/ui/abi/unsupported.arm.stderr
index dfb4b573349..b2f24381336 100644
--- a/tests/ui/abi/unsupported.arm.stderr
+++ b/tests/ui/abi/unsupported.arm.stderr
@@ -185,3 +185,102 @@ LL | extern "C-cmse-nonsecure-entry" fn cmse_entry() {}
 error: aborting due to 17 previous errors; 9 warnings emitted
 
 For more information about this error, try `rustc --explain E0570`.
+Future incompatibility report: Future breakage diagnostic:
+warning: the calling convention "ptx-kernel" is not supported on this target
+  --> $DIR/unsupported.rs:35:15
+   |
+LL | fn ptx_ptr(f: extern "ptx-kernel" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "msp430-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:73:18
+   |
+LL | fn msp430_ptr(f: extern "msp430-interrupt" fn()) {
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "avr-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:83:15
+   |
+LL | fn avr_ptr(f: extern "avr-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "riscv-interrupt-m" is not supported on this target
+  --> $DIR/unsupported.rs:96:17
+   |
+LL | fn riscv_ptr(f: extern "riscv-interrupt-m" fn()) {
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "x86-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:118:15
+   |
+LL | fn x86_ptr(f: extern "x86-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "thiscall" is not supported on this target
+  --> $DIR/unsupported.rs:141:20
+   |
+LL | fn thiscall_ptr(f: extern "thiscall" fn()) {
+   |                    ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "stdcall" is not supported on this target
+  --> $DIR/unsupported.rs:167:19
+   |
+LL | fn stdcall_ptr(f: extern "stdcall" fn()) {
+   |                   ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-call" is not supported on this target
+  --> $DIR/unsupported.rs:187:21
+   |
+LL | fn cmse_call_ptr(f: extern "C-cmse-nonsecure-call" fn()) {
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-entry" is not supported on this target
+  --> $DIR/unsupported.rs:195:22
+   |
+LL | fn cmse_entry_ptr(f: extern "C-cmse-nonsecure-entry" fn()) {
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
diff --git a/tests/ui/abi/unsupported.i686.stderr b/tests/ui/abi/unsupported.i686.stderr
index d7b76a4730b..94bd9b8af90 100644
--- a/tests/ui/abi/unsupported.i686.stderr
+++ b/tests/ui/abi/unsupported.i686.stderr
@@ -143,3 +143,80 @@ LL | extern "C-cmse-nonsecure-entry" fn cmse_entry() {}
 error: aborting due to 13 previous errors; 7 warnings emitted
 
 For more information about this error, try `rustc --explain E0570`.
+Future incompatibility report: Future breakage diagnostic:
+warning: the calling convention "ptx-kernel" is not supported on this target
+  --> $DIR/unsupported.rs:35:15
+   |
+LL | fn ptx_ptr(f: extern "ptx-kernel" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "aapcs" is not supported on this target
+  --> $DIR/unsupported.rs:51:17
+   |
+LL | fn aapcs_ptr(f: extern "aapcs" fn()) {
+   |                 ^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "msp430-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:73:18
+   |
+LL | fn msp430_ptr(f: extern "msp430-interrupt" fn()) {
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "avr-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:83:15
+   |
+LL | fn avr_ptr(f: extern "avr-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "riscv-interrupt-m" is not supported on this target
+  --> $DIR/unsupported.rs:96:17
+   |
+LL | fn riscv_ptr(f: extern "riscv-interrupt-m" fn()) {
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-call" is not supported on this target
+  --> $DIR/unsupported.rs:187:21
+   |
+LL | fn cmse_call_ptr(f: extern "C-cmse-nonsecure-call" fn()) {
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-entry" is not supported on this target
+  --> $DIR/unsupported.rs:195:22
+   |
+LL | fn cmse_entry_ptr(f: extern "C-cmse-nonsecure-entry" fn()) {
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
diff --git a/tests/ui/abi/unsupported.riscv32.stderr b/tests/ui/abi/unsupported.riscv32.stderr
index eef2ead4f0f..c6ff47283c6 100644
--- a/tests/ui/abi/unsupported.riscv32.stderr
+++ b/tests/ui/abi/unsupported.riscv32.stderr
@@ -185,3 +185,102 @@ LL | extern "C-cmse-nonsecure-entry" fn cmse_entry() {}
 error: aborting due to 17 previous errors; 9 warnings emitted
 
 For more information about this error, try `rustc --explain E0570`.
+Future incompatibility report: Future breakage diagnostic:
+warning: the calling convention "ptx-kernel" is not supported on this target
+  --> $DIR/unsupported.rs:35:15
+   |
+LL | fn ptx_ptr(f: extern "ptx-kernel" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "aapcs" is not supported on this target
+  --> $DIR/unsupported.rs:51:17
+   |
+LL | fn aapcs_ptr(f: extern "aapcs" fn()) {
+   |                 ^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "msp430-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:73:18
+   |
+LL | fn msp430_ptr(f: extern "msp430-interrupt" fn()) {
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "avr-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:83:15
+   |
+LL | fn avr_ptr(f: extern "avr-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "x86-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:118:15
+   |
+LL | fn x86_ptr(f: extern "x86-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "thiscall" is not supported on this target
+  --> $DIR/unsupported.rs:141:20
+   |
+LL | fn thiscall_ptr(f: extern "thiscall" fn()) {
+   |                    ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "stdcall" is not supported on this target
+  --> $DIR/unsupported.rs:167:19
+   |
+LL | fn stdcall_ptr(f: extern "stdcall" fn()) {
+   |                   ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-call" is not supported on this target
+  --> $DIR/unsupported.rs:187:21
+   |
+LL | fn cmse_call_ptr(f: extern "C-cmse-nonsecure-call" fn()) {
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-entry" is not supported on this target
+  --> $DIR/unsupported.rs:195:22
+   |
+LL | fn cmse_entry_ptr(f: extern "C-cmse-nonsecure-entry" fn()) {
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
diff --git a/tests/ui/abi/unsupported.riscv64.stderr b/tests/ui/abi/unsupported.riscv64.stderr
index eef2ead4f0f..c6ff47283c6 100644
--- a/tests/ui/abi/unsupported.riscv64.stderr
+++ b/tests/ui/abi/unsupported.riscv64.stderr
@@ -185,3 +185,102 @@ LL | extern "C-cmse-nonsecure-entry" fn cmse_entry() {}
 error: aborting due to 17 previous errors; 9 warnings emitted
 
 For more information about this error, try `rustc --explain E0570`.
+Future incompatibility report: Future breakage diagnostic:
+warning: the calling convention "ptx-kernel" is not supported on this target
+  --> $DIR/unsupported.rs:35:15
+   |
+LL | fn ptx_ptr(f: extern "ptx-kernel" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "aapcs" is not supported on this target
+  --> $DIR/unsupported.rs:51:17
+   |
+LL | fn aapcs_ptr(f: extern "aapcs" fn()) {
+   |                 ^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "msp430-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:73:18
+   |
+LL | fn msp430_ptr(f: extern "msp430-interrupt" fn()) {
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "avr-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:83:15
+   |
+LL | fn avr_ptr(f: extern "avr-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "x86-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:118:15
+   |
+LL | fn x86_ptr(f: extern "x86-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "thiscall" is not supported on this target
+  --> $DIR/unsupported.rs:141:20
+   |
+LL | fn thiscall_ptr(f: extern "thiscall" fn()) {
+   |                    ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "stdcall" is not supported on this target
+  --> $DIR/unsupported.rs:167:19
+   |
+LL | fn stdcall_ptr(f: extern "stdcall" fn()) {
+   |                   ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-call" is not supported on this target
+  --> $DIR/unsupported.rs:187:21
+   |
+LL | fn cmse_call_ptr(f: extern "C-cmse-nonsecure-call" fn()) {
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-entry" is not supported on this target
+  --> $DIR/unsupported.rs:195:22
+   |
+LL | fn cmse_entry_ptr(f: extern "C-cmse-nonsecure-entry" fn()) {
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
diff --git a/tests/ui/abi/unsupported.x64.stderr b/tests/ui/abi/unsupported.x64.stderr
index 80613d83e58..0a9f9a69123 100644
--- a/tests/ui/abi/unsupported.x64.stderr
+++ b/tests/ui/abi/unsupported.x64.stderr
@@ -185,3 +185,102 @@ LL | extern "C-cmse-nonsecure-entry" fn cmse_entry() {}
 error: aborting due to 17 previous errors; 9 warnings emitted
 
 For more information about this error, try `rustc --explain E0570`.
+Future incompatibility report: Future breakage diagnostic:
+warning: the calling convention "ptx-kernel" is not supported on this target
+  --> $DIR/unsupported.rs:35:15
+   |
+LL | fn ptx_ptr(f: extern "ptx-kernel" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "aapcs" is not supported on this target
+  --> $DIR/unsupported.rs:51:17
+   |
+LL | fn aapcs_ptr(f: extern "aapcs" fn()) {
+   |                 ^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "msp430-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:73:18
+   |
+LL | fn msp430_ptr(f: extern "msp430-interrupt" fn()) {
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "avr-interrupt" is not supported on this target
+  --> $DIR/unsupported.rs:83:15
+   |
+LL | fn avr_ptr(f: extern "avr-interrupt" fn()) {
+   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "riscv-interrupt-m" is not supported on this target
+  --> $DIR/unsupported.rs:96:17
+   |
+LL | fn riscv_ptr(f: extern "riscv-interrupt-m" fn()) {
+   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "thiscall" is not supported on this target
+  --> $DIR/unsupported.rs:141:20
+   |
+LL | fn thiscall_ptr(f: extern "thiscall" fn()) {
+   |                    ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "stdcall" is not supported on this target
+  --> $DIR/unsupported.rs:167:19
+   |
+LL | fn stdcall_ptr(f: extern "stdcall" fn()) {
+   |                   ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-call" is not supported on this target
+  --> $DIR/unsupported.rs:187:21
+   |
+LL | fn cmse_call_ptr(f: extern "C-cmse-nonsecure-call" fn()) {
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
+Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-entry" is not supported on this target
+  --> $DIR/unsupported.rs:195:22
+   |
+LL | fn cmse_entry_ptr(f: extern "C-cmse-nonsecure-entry" fn()) {
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+
diff --git a/tests/ui/c-variadic/variadic-ffi-2.rs b/tests/ui/c-variadic/variadic-ffi-2.rs
index 99f83f22d17..da7bb76fc14 100644
--- a/tests/ui/c-variadic/variadic-ffi-2.rs
+++ b/tests/ui/c-variadic/variadic-ffi-2.rs
@@ -1,8 +1,6 @@
-//@ ignore-arm stdcall isn't supported
 #![feature(extended_varargs_abi_support)]
 
-#[allow(unsupported_fn_ptr_calling_conventions)]
-fn baz(f: extern "stdcall" fn(usize, ...)) {
+fn baz(f: extern "Rust" fn(usize, ...)) {
     //~^ ERROR: C-variadic function must have a compatible calling convention,
     // like C, cdecl, system, aapcs, win64, sysv64 or efiapi
     f(22, 44);
diff --git a/tests/ui/c-variadic/variadic-ffi-2.stderr b/tests/ui/c-variadic/variadic-ffi-2.stderr
index e52de93a926..9f8dcefdb03 100644
--- a/tests/ui/c-variadic/variadic-ffi-2.stderr
+++ b/tests/ui/c-variadic/variadic-ffi-2.stderr
@@ -1,8 +1,8 @@
 error[E0045]: C-variadic function must have a compatible calling convention, like `C`, `cdecl`, `system`, `aapcs`, `win64`, `sysv64` or `efiapi`
-  --> $DIR/variadic-ffi-2.rs:5:11
+  --> $DIR/variadic-ffi-2.rs:3:11
    |
-LL | fn baz(f: extern "stdcall" fn(usize, ...)) {
-   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ C-variadic function must have a compatible calling convention
+LL | fn baz(f: extern "Rust" fn(usize, ...)) {
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ C-variadic function must have a compatible calling convention
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.stderr b/tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.stderr
index 63260b5c78f..beb0ab70cc7 100644
--- a/tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.stderr
+++ b/tests/ui/cmse-nonsecure/cmse-nonsecure-call/gate_test.stderr
@@ -11,3 +11,13 @@ LL |         core::mem::transmute::<usize, extern "C-cmse-nonsecure-call" fn(i32
 error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0658`.
+Future incompatibility report: Future breakage diagnostic:
+warning: the calling convention "C-cmse-nonsecure-call" is not supported on this target
+  --> $DIR/gate_test.rs:5:39
+   |
+LL |         core::mem::transmute::<usize, extern "C-cmse-nonsecure-call" fn(i32, i32, i32, i32) -> i32>(
+   |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+
diff --git a/tests/ui/feature-gates/feature-gate-abi_gpu_kernel.stderr b/tests/ui/feature-gates/feature-gate-abi_gpu_kernel.stderr
index d8dbd94696e..aa9c67f0151 100644
--- a/tests/ui/feature-gates/feature-gate-abi_gpu_kernel.stderr
+++ b/tests/ui/feature-gates/feature-gate-abi_gpu_kernel.stderr
@@ -112,3 +112,14 @@ error: aborting due to 12 previous errors; 1 warning emitted
 
 Some errors have detailed explanations: E0570, E0658.
 For more information about an error, try `rustc --explain E0570`.
+Future incompatibility report: Future breakage diagnostic:
+warning: the calling convention "gpu-kernel" is not supported on this target
+  --> $DIR/feature-gate-abi_gpu_kernel.rs:37:11
+   |
+LL | type A1 = extern "gpu-kernel" fn(_: ());
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #130260 <https://github.com/rust-lang/rust/issues/130260>
+   = note: `#[warn(unsupported_fn_ptr_calling_conventions)]` on by default
+