Rollup merge of #98670 - krasimirgg:llvm-15-LLVMConstExtractValue, r=nikic

llvm-wrapper: adapt for LLVMConstExtractValue removal

`LLVMConstExtractValue` was removed recently from LLVM: https://github.com/llvm/llvm-project/commit/5548e807b5777fdda167b6795e0e05432a6163f1.

This adapts llvm-wrapper to use the new alternative where available, following https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm/topic/LLVMConstExtractValue.20removal.

2 files changed, 2 insertions, 7 deletions

diff --git a/compiler/rustc_codegen_llvm/src/common.rs b/compiler/rustc_codegen_llvm/src/common.rs
index b69d7a000ee..d37aadeb523 100644
--- a/compiler/rustc_codegen_llvm/src/common.rs
+++ b/compiler/rustc_codegen_llvm/src/common.rs
@@ -109,8 +109,7 @@ impl<'ll> CodegenCx<'ll, '_> {
     pub fn const_get_elt(&self, v: &'ll Value, idx: u64) -> &'ll Value {
         unsafe {
             assert_eq!(idx as c_uint as u64, idx);
-            let us = &[idx as c_uint];
-            let r = llvm::LLVMConstExtractValue(v, us.as_ptr(), us.len() as c_uint);
+            let r = llvm::LLVMGetAggregateElement(v, idx as c_uint).unwrap();
 
             debug!("const_get_elt(v={:?}, idx={}, r={:?})", v, idx, r);
 
diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index b831423994f..d92d9d96fe2 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -1134,11 +1134,7 @@ extern "C" {
     pub fn LLVMConstIntToPtr<'a>(ConstantVal: &'a Value, ToType: &'a Type) -> &'a Value;
     pub fn LLVMConstBitCast<'a>(ConstantVal: &'a Value, ToType: &'a Type) -> &'a Value;
     pub fn LLVMConstPointerCast<'a>(ConstantVal: &'a Value, ToType: &'a Type) -> &'a Value;
-    pub fn LLVMConstExtractValue(
-        AggConstant: &Value,
-        IdxList: *const c_uint,
-        NumIdx: c_uint,
-    ) -> &Value;
+    pub fn LLVMGetAggregateElement(ConstantVal: &Value, Idx: c_uint) -> Option<&Value>;
 
     // Operations on global variables, functions, and aliases (globals)
     pub fn LLVMIsDeclaration(Global: &Value) -> Bool;