all: remove LLVM 14 support

This is a big change: apart from removing LLVM 14 it also removes typed
pointer support (which was only fully supported in LLVM up to version
14). This removes about 200 lines of code, but more importantly removes
a ton of special cases for LLVM 14.

builder/build.go

@@ -532,13 +532,13 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			irbuilder := mod.Context().NewBuilder()
 			defer irbuilder.Dispose()
 			irbuilder.SetInsertPointAtEnd(block)
-			i8ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
+			ptrType := llvm.PointerType(mod.Context().Int8Type(), 0)
 			for _, pkg := range lprogram.Sorted() {
 				pkgInit := mod.NamedFunction(pkg.Pkg.Path() + ".init")
 				if pkgInit.IsNil() {
 					panic("init not found for " + pkg.Pkg.Path())
 				}
-				irbuilder.CreateCall(pkgInit.GlobalValueType(), pkgInit, []llvm.Value{llvm.Undef(i8ptrType)}, "")
+				irbuilder.CreateCall(pkgInit.GlobalValueType(), pkgInit, []llvm.Value{llvm.Undef(ptrType)}, "")
 			}
 			irbuilder.CreateRetVoid()
 
@@ -764,7 +764,7 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 			if sizeLevel >= 2 {
 				// Workaround with roughly the same effect as
 				// https://reviews.llvm.org/D119342.
-				// Can hopefully be removed in LLVM 15.
+				// Can hopefully be removed in LLVM 18.
 				ldflags = append(ldflags,
 					"-mllvm", "--rotation-max-header-size=0")
 			}

builder/library.go

@@ -178,12 +178,6 @@ func (l *Library) load(config *compileopts.Config, tmpdir string) (job *compileJ
 	if strings.HasPrefix(target, "riscv64-") {
 		args = append(args, "-march=rv64gc")
 	}
-	if strings.HasPrefix(target, "xtensa") {
-		// Hack to work around an issue in the Xtensa port:
-		// https://github.com/espressif/llvm-project/issues/52
-		// Hopefully this will be fixed soon (LLVM 14).
-		args = append(args, "-D__ELF__")
-	}
 
 	var once sync.Once
 

builder/musl.go

@@ -6,12 +6,10 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"strconv"
 	"strings"
 
 	"github.com/tinygo-org/tinygo/compileopts"
 	"github.com/tinygo-org/tinygo/goenv"
-	"tinygo.org/x/go-llvm"
 )
 
 var Musl = Library{
@@ -93,6 +91,7 @@ var Musl = Library{
 			"-Wno-string-plus-int",
 			"-Wno-ignored-pragmas",
 			"-Wno-tautological-constant-out-of-range-compare",
+			"-Wno-deprecated-non-prototype",
 			"-Qunused-arguments",
 			// Select include dirs. Don't include standard library includes
 			// (that would introduce host dependencies and other complications),
@@ -106,11 +105,6 @@ var Musl = Library{
 			"-I" + muslDir + "/include",
 			"-fno-stack-protector",
 		}
-		llvmMajor, _ := strconv.Atoi(strings.SplitN(llvm.Version, ".", 2)[0])
-		if llvmMajor >= 15 {
-			// This flag was added in Clang 15. It is not present in LLVM 14.
-			cflags = append(cflags, "-Wno-deprecated-non-prototype")
-		}
 		return cflags
 	},
 	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/musl/src") },