Rollup merge of #96215 - nikic:legacy-pm-removal, r=nagisa

Drop support for legacy PM with LLVM 15

LLVM 15 already removes some of the legacy PM APIs we're using. This patch forces use of NewPM with LLVM 15 (with `-Z new-llvm-pass-manager=no` throwing a warning) and stubs out various FFI methods with a report_fatal_error on LLVM 15.

For LLVMPassManagerBuilderPopulateLTOPassManager() I went with adding our own wrapper, as the alternative would be to muck about with weak symbols, which seems to be non-trivial as far as cross-platform support is concerned (std has `weak!` for this purpose, but only as an internal utility.)

Fixes #96072.
Fixes #96362.

1 files changed, 7 insertions, 8 deletions

diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 7f533b0552a..13baaddccd4 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -1825,24 +1825,22 @@ extern "C" {
 
     pub fn LLVMAddAnalysisPasses<'a>(T: &'a TargetMachine, PM: &PassManager<'a>);
 
-    pub fn LLVMPassManagerBuilderCreate() -> &'static mut PassManagerBuilder;
-    pub fn LLVMPassManagerBuilderDispose(PMB: &'static mut PassManagerBuilder);
-    pub fn LLVMPassManagerBuilderSetSizeLevel(PMB: &PassManagerBuilder, Value: Bool);
-    pub fn LLVMPassManagerBuilderSetDisableUnrollLoops(PMB: &PassManagerBuilder, Value: Bool);
-    pub fn LLVMPassManagerBuilderUseInlinerWithThreshold(
+    pub fn LLVMRustPassManagerBuilderCreate() -> &'static mut PassManagerBuilder;
+    pub fn LLVMRustPassManagerBuilderDispose(PMB: &'static mut PassManagerBuilder);
+    pub fn LLVMRustPassManagerBuilderUseInlinerWithThreshold(
         PMB: &PassManagerBuilder,
         threshold: c_uint,
     );
-    pub fn LLVMPassManagerBuilderPopulateModulePassManager(
+    pub fn LLVMRustPassManagerBuilderPopulateModulePassManager(
         PMB: &PassManagerBuilder,
         PM: &PassManager<'_>,
     );
 
-    pub fn LLVMPassManagerBuilderPopulateFunctionPassManager(
+    pub fn LLVMRustPassManagerBuilderPopulateFunctionPassManager(
         PMB: &PassManagerBuilder,
         PM: &PassManager<'_>,
     );
-    pub fn LLVMPassManagerBuilderPopulateLTOPassManager(
+    pub fn LLVMRustPassManagerBuilderPopulateLTOPassManager(
         PMB: &PassManagerBuilder,
         PM: &PassManager<'_>,
         Internalize: Bool,
@@ -2308,6 +2306,7 @@ extern "C" {
         PGOGenPath: *const c_char,
         PGOUsePath: *const c_char,
         PGOSampleUsePath: *const c_char,
+        SizeLevel: c_int,
     );
     pub fn LLVMRustAddLibraryInfo<'a>(
         PM: &PassManager<'a>,