Update the minimum external LLVM to 17

.github/workflows/ci.yml

@@ -58,7 +58,7 @@ jobs:
           - name: mingw-check-tidy
             os: ubuntu-20.04-4core-16gb
             env: {}
-          - name: x86_64-gnu-llvm-16
+          - name: x86_64-gnu-llvm-17
             env:
               ENABLE_GCC_CODEGEN: "1"
             os: ubuntu-20.04-16core-64gb
@@ -323,10 +323,6 @@ jobs:
             env:
               RUST_BACKTRACE: 1
             os: ubuntu-20.04-8core-32gb
-          - name: x86_64-gnu-llvm-16
-            env:
-              RUST_BACKTRACE: 1
-            os: ubuntu-20.04-8core-32gb
           - name: x86_64-gnu-nopt
             os: ubuntu-20.04-4core-16gb
             env: {}

compiler/rustc_codegen_llvm/src/context.rs

@@ -126,17 +126,6 @@ pub unsafe fn create_module<'ll>(
 
     let mut target_data_layout = sess.target.data_layout.to_string();
     let llvm_version = llvm_util::get_version();
-    if llvm_version < (17, 0, 0) {
-        if sess.target.arch.starts_with("powerpc") {
-            // LLVM 17 specifies function pointer alignment for ppc:
-            // https://reviews.llvm.org/D147016
-            target_data_layout = target_data_layout
-                .replace("-Fn32", "")
-                .replace("-Fi32", "")
-                .replace("-Fn64", "")
-                .replace("-Fi64", "");
-        }
-    }
     if llvm_version < (18, 0, 0) {
         if sess.target.arch == "x86" || sess.target.arch == "x86_64" {
             // LLVM 18 adjusts i128 to be 128-bit aligned on x86 variants.

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -24,9 +24,7 @@
 #include "llvm/Passes/StandardInstrumentations.h"
 #include "llvm/Support/CBindingWrapping.h"
 #include "llvm/Support/FileSystem.h"
-#if LLVM_VERSION_GE(17, 0)
 #include "llvm/Support/VirtualFileSystem.h"
-#endif
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Transforms/IPO/AlwaysInliner.h"
 #include "llvm/Transforms/IPO/FunctionImport.h"
@@ -334,14 +332,8 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM,
 
   std::ostringstream Buf;
 
-#if LLVM_VERSION_GE(17, 0)
   const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
   const ArrayRef<SubtargetSubTypeKV> CPUTable = MCInfo->getAllProcessorDescriptions();
-#else
-  Buf << "Full target CPU help is not supported by this LLVM version.\n\n";
-  SubtargetSubTypeKV TargetCPUKV = { TargetCPU, {{}}, {{}} };
-  const ArrayRef<SubtargetSubTypeKV> CPUTable = TargetCPUKV;
-#endif
   unsigned MaxCPULen = getLongestEntryLength(CPUTable);
 
   Buf << "Available CPUs for this target:\n";
@@ -476,10 +468,6 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
   Options.RelaxELFRelocations = RelaxELFRelocations;
 #endif
   Options.UseInitArray = UseInitArray;
-
-#if LLVM_VERSION_LT(17, 0)
-  Options.ExplicitEmulatedTLS = true;
-#endif
   Options.EmulatedTLS = UseEmulatedTls;
 
   if (TrapUnreachable) {
@@ -761,50 +749,32 @@ LLVMRustOptimize(
   }
 
   std::optional<PGOOptions> PGOOpt;
-#if LLVM_VERSION_GE(17, 0)
   auto FS = vfs::getRealFileSystem();
-#endif
   if (PGOGenPath) {
     assert(!PGOUsePath && !PGOSampleUsePath);
-    PGOOpt = PGOOptions(PGOGenPath, "", "",
-#if LLVM_VERSION_GE(17, 0)
-                        "",
-                        FS,
-#endif
+    PGOOpt = PGOOptions(PGOGenPath, "", "", "", FS,
                         PGOOptions::IRInstr, PGOOptions::NoCSAction,
 #if LLVM_VERSION_GE(19, 0)
                         PGOOptions::ColdFuncOpt::Default,
 #endif
                         DebugInfoForProfiling);
   } else if (PGOUsePath) {
     assert(!PGOSampleUsePath);
-    PGOOpt = PGOOptions(PGOUsePath, "", "",
-#if LLVM_VERSION_GE(17, 0)
-                        "",
-                        FS,
-#endif
+    PGOOpt = PGOOptions(PGOUsePath, "", "", "", FS,
                         PGOOptions::IRUse, PGOOptions::NoCSAction,
 #if LLVM_VERSION_GE(19, 0)
                         PGOOptions::ColdFuncOpt::Default,
 #endif
                         DebugInfoForProfiling);
   } else if (PGOSampleUsePath) {
-    PGOOpt = PGOOptions(PGOSampleUsePath, "", "",
-#if LLVM_VERSION_GE(17, 0)
-                        "",
-                        FS,
-#endif
+    PGOOpt = PGOOptions(PGOSampleUsePath, "", "", "", FS,
                         PGOOptions::SampleUse, PGOOptions::NoCSAction,
 #if LLVM_VERSION_GE(19, 0)
                         PGOOptions::ColdFuncOpt::Default,
 #endif
                         DebugInfoForProfiling);
   } else if (DebugInfoForProfiling) {
-    PGOOpt = PGOOptions("", "", "",
-#if LLVM_VERSION_GE(17, 0)
-                        "",
-                        FS,
-#endif
+    PGOOpt = PGOOptions("", "", "", "", FS,
                         PGOOptions::NoAction, PGOOptions::NoCSAction,
 #if LLVM_VERSION_GE(19, 0)
                         PGOOptions::ColdFuncOpt::Default,
@@ -1353,9 +1323,7 @@ LLVMRustCreateThinLTOData(LLVMRustThinLTOModule *modules,
   ComputeCrossModuleImport(
     Ret->Index,
     Ret->ModuleToDefinedGVSummaries,
-#if LLVM_VERSION_GE(17, 0)
     isPrevailing,
-#endif
     Ret->ImportLists,
     Ret->ExportLists
   );

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -2152,19 +2152,3 @@ extern "C" LLVMValueRef LLVMConstStringInContext2(LLVMContextRef C,
   return wrap(ConstantDataArray::getString(*unwrap(C), StringRef(Str, Length), !DontNullTerminate));
 }
 #endif
-
-// FIXME: Remove when Rust's minimum supported LLVM version reaches 17.
-// https://github.com/llvm/llvm-project/commit/35276f16e5a2cae0dfb49c0fbf874d4d2f177acc
-#if LLVM_VERSION_LT(17, 0)
-extern "C" LLVMValueRef LLVMConstArray2(LLVMTypeRef ElementTy,
-                                        LLVMValueRef *ConstantVals,
-                                        uint64_t Length) {
-  ArrayRef<Constant *> V(unwrap<Constant>(ConstantVals, Length), Length);
-  return wrap(ConstantArray::get(ArrayType::get(unwrap(ElementTy), Length), V));
-}
-
-extern "C" LLVMTypeRef LLVMArrayType2(LLVMTypeRef ElementTy,
-                                      uint64_t ElementCount) {
-  return wrap(ArrayType::get(unwrap(ElementTy), ElementCount));
-}
-#endif

src/bootstrap/src/core/build_steps/llvm.rs

@@ -564,11 +564,11 @@ fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
     let version = output(cmd.arg("--version"));
     let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
     if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
-        if major >= 16 {
+        if major >= 17 {
             return;
         }
     }
-    panic!("\n\nbad LLVM version: {version}, need >=16.0\n\n")
+    panic!("\n\nbad LLVM version: {version}, need >=17.0\n\n")
 }
 
 fn configure_cmake(

src/ci/docker/host-x86_64/x86_64-gnu-llvm-17/Dockerfile

@@ -56,11 +56,10 @@ ENV RUST_CONFIGURE_ARGS \
       --enable-llvm-link-shared \
       --set rust.thin-lto-import-instr-limit=10
 
-COPY host-x86_64/x86_64-gnu-llvm-16/script.sh /tmp/
-
 COPY host-x86_64/dist-x86_64-linux/shared.sh /scripts/
 COPY host-x86_64/dist-x86_64-linux/build-gccjit.sh /scripts/
 
 RUN /scripts/build-gccjit.sh /scripts
 
+COPY scripts/x86_64-gnu-llvm.sh /tmp/script.sh
 ENV SCRIPT /tmp/script.sh

src/ci/docker/host-x86_64/x86_64-gnu-llvm-18/Dockerfile

@@ -24,11 +24,14 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   xz-utils \
   nodejs \
   mingw-w64 \
-  libgccjit-13-dev \
+  # libgccjit dependencies
+  flex \
+  libmpfr-dev \
+  libgmp-dev \
+  libmpc3 \
+  libmpc-dev \
   && rm -rf /var/lib/apt/lists/*
 
-# Note: libgccjit needs to match the default gcc version for the linker to find it.
-
 # Install powershell (universal package) so we can test x.ps1 on Linux
 # FIXME: need a "universal" version that supports libicu74, but for now it still works to ignore that dep.
 RUN curl -sL "https://github.com/PowerShell/PowerShell/releases/download/v7.3.1/powershell_7.3.1-1.deb_amd64.deb" > powershell.deb && \
@@ -50,6 +53,10 @@ ENV RUST_CONFIGURE_ARGS \
       --enable-llvm-link-shared \
       --set rust.thin-lto-import-instr-limit=10
 
-COPY host-x86_64/x86_64-gnu-llvm-16/script.sh /tmp/
+COPY host-x86_64/dist-x86_64-linux/shared.sh /scripts/
+COPY host-x86_64/dist-x86_64-linux/build-gccjit.sh /scripts/
+
+RUN /scripts/build-gccjit.sh /scripts
 
+COPY scripts/x86_64-gnu-llvm.sh /tmp/script.sh
 ENV SCRIPT /tmp/script.sh

src/ci/github-actions/ci.yml

@@ -357,7 +357,7 @@ jobs:
           - name: mingw-check-tidy
             <<: *job-linux-4c
 
-          - name: x86_64-gnu-llvm-16
+          - name: x86_64-gnu-llvm-17
             env:
               ENABLE_GCC_CODEGEN: "1"
             <<: *job-linux-16c
@@ -520,11 +520,6 @@ jobs:
               RUST_BACKTRACE: 1
             <<: *job-linux-8c
 
-          - name: x86_64-gnu-llvm-16
-            env:
-              RUST_BACKTRACE: 1
-            <<: *job-linux-8c
-
           - name: x86_64-gnu-nopt
             <<: *job-linux-4c
 

tests/codegen/issues/issue-114312.rs

@@ -1,5 +1,4 @@
 //@ compile-flags: -O
-//@ min-llvm-version: 17
 //@ only-x86_64-unknown-linux-gnu
 
 // We want to check that this function does not mis-optimize to loop jumping.

tests/codegen/move-before-nocapture-ref-arg.rs

@@ -1,7 +1,6 @@
 // Verify that move before the call of the function with noalias, nocapture, readonly.
 // #107436
 //@ compile-flags: -O
-//@ min-llvm-version: 17
 
 #![crate_type = "lib"]
 

tests/codegen/option-as-slice.rs

@@ -1,7 +1,5 @@
 //@ compile-flags: -O -Z randomize-layout=no
 //@ only-x86_64
-//@ ignore-llvm-version: 16.0.0
-//  ^-- needs https://reviews.llvm.org/D146149 in 16.0.1
 #![crate_type = "lib"]
 #![feature(generic_nonzero)]
 

tests/codegen/trailing_zeros.rs

@@ -1,5 +1,4 @@
 //@ compile-flags: -O
-//@ min-llvm-version: 17
 
 #![crate_type = "lib"]
 

tests/codegen/vec-shrink-panik.rs

@@ -1,8 +1,5 @@
-//@ revisions: old new
 // LLVM 17 realizes double panic is not possible and doesn't generate calls
 // to panic_cannot_unwind.
-//@ [old]ignore-llvm-version: 17 - 99
-//@ [new]min-llvm-version: 17
 //@ compile-flags: -O
 //@ ignore-debug: plain old debug assertions
 //@ needs-unwind
@@ -22,14 +19,6 @@ pub fn shrink_to_fit(vec: &mut Vec<u32>) {
 // CHECK-LABEL: @issue71861
 #[no_mangle]
 pub fn issue71861(vec: Vec<u32>) -> Box<[u32]> {
-    // CHECK-NOT: panic
-
-    // Call to panic_cannot_unwind in case of double-panic is expected
-    // on LLVM 16 and older, but other panics are not.
-    // old: filter
-    // old-NEXT: ; call core::panicking::panic_cannot_unwind
-    // old-NEXT: panic_cannot_unwind
-
     // CHECK-NOT: panic
     vec.into_boxed_slice()
 }
@@ -40,6 +29,3 @@ pub fn issue75636<'a>(iter: &[&'a str]) -> Box<[&'a str]> {
     // CHECK-NOT: panic
     iter.iter().copied().collect()
 }
-
-// old: ; core::panicking::panic_cannot_unwind
-// old: declare void @{{.*}}panic_cannot_unwind

tests/run-make/lto-linkage-used-attr/Makefile

@@ -2,7 +2,6 @@ include ../tools.mk
 
 # Verify that the impl_* symbols are preserved. #108030
 # only-x86_64-unknown-linux-gnu
-# min-llvm-version: 17
 
 all:
 	$(RUSTC) -Cdebuginfo=0 -Copt-level=3 lib.rs

tests/ui/codegen/target-cpus.rs

@@ -1,4 +1,3 @@
 //@ needs-llvm-components: webassembly
-//@ min-llvm-version: 17
 //@ compile-flags: --print=target-cpus --target=wasm32-unknown-unknown
 //@ check-pass