all: build/test using Go 1.27-rc1

.github/workflows/build-macos.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v5
@@ -71,7 +71,7 @@ jobs:
         uses: actions/cache/restore@v5
         id: cache-llvm-build
         with:
-          key: llvm-build-20-${{ matrix.os }}-v2
+          key: llvm-build-20-${{ matrix.os }}-v3
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -131,7 +131,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Build TinyGo (LLVM ${{ matrix.version }})
         run: go install -tags=llvm${{ matrix.version }}

.github/workflows/compat.yml

@@ -20,7 +20,7 @@ jobs:
     env:
       # Oldest versions currently supported by TinyGo
       LLVM: "15"
-      Go: "1.24" # when updating this, also update minorMin in builder/config.go
+      Go: "1.25" # when updating this, also update minorMin in builder/config.go
     steps:
       - name: Checkout
         uses: actions/checkout@v6

.github/workflows/linux.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Run go mod tidy
         run: go mod tidy
@@ -36,7 +36,7 @@ jobs:
     # statically linked binary.
     runs-on: ubuntu-latest
     container:
-      image: golang:1.26-alpine
+      image: golang:1.27rc1-alpine
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
@@ -91,7 +91,7 @@ jobs:
         uses: actions/cache/restore@v5
         id: cache-llvm-build
         with:
-          key: llvm-build-20-linux-alpine-v2
+          key: llvm-build-20-linux-alpine-v3
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -115,7 +115,7 @@ jobs:
         uses: actions/cache@v5
         id: cache-binaryen
         with:
-          key: binaryen-linux-alpine-v2
+          key: binaryen-linux-alpine-v3
           path: build/wasm-opt
       - name: Build Binaryen
         if: steps.cache-binaryen.outputs.cache-hit != 'true'
@@ -160,7 +160,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Install wasmtime
         uses: bytecodealliance/actions/wasmtime/setup@v1
@@ -204,7 +204,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Install Node.js
         uses: actions/setup-node@v6
@@ -245,7 +245,7 @@ jobs:
         uses: actions/cache/restore@v5
         id: cache-llvm-build
         with:
-          key: llvm-build-20-linux-asserts-v1
+          key: llvm-build-20-linux-asserts-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -323,7 +323,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v5
@@ -354,7 +354,7 @@ jobs:
         uses: actions/cache/restore@v5
         id: cache-llvm-build
         with:
-          key: llvm-build-20-linux-${{ matrix.goarch }}-v1
+          key: llvm-build-20-linux-${{ matrix.goarch }}-v2
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -378,7 +378,7 @@ jobs:
         uses: actions/cache@v5
         id: cache-binaryen
         with:
-          key: binaryen-linux-${{ matrix.goarch }}-v4
+          key: binaryen-linux-${{ matrix.goarch }}-v5
           path: build/wasm-opt
       - name: Build Binaryen
         if: steps.cache-binaryen.outputs.cache-hit != 'true'

.github/workflows/windows.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Restore cached LLVM source
         uses: actions/cache/restore@v5
@@ -65,7 +65,7 @@ jobs:
         uses: actions/cache/restore@v5
         id: cache-llvm-build
         with:
-          key: llvm-build-20-windows-v4
+          key: llvm-build-20-windows-v5
           path: llvm-build
       - name: Build LLVM
         if: steps.cache-llvm-build.outputs.cache-hit != 'true'
@@ -129,7 +129,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v8
@@ -150,7 +150,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v8
@@ -176,7 +176,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.26.4'
+          go-version: '1.27.0-rc.1'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v8

Dockerfile

@@ -1,5 +1,5 @@
 # tinygo-llvm stage obtains the llvm source for TinyGo
-FROM golang:1.26 AS tinygo-llvm
+FROM golang:1.27rc1 AS tinygo-llvm
 
 RUN apt-get update && \
     apt-get install -y apt-utils make cmake clang-17 ninja-build && \
@@ -33,7 +33,7 @@ RUN cd /tinygo/ && \
 
 # tinygo-compiler copies the compiler build over to a base Go container (without
 # all the build tools etc).
-FROM golang:1.26 AS tinygo-compiler
+FROM golang:1.27rc1 AS tinygo-compiler
 
 # Copy tinygo build.
 COPY --from=tinygo-compiler-build /tinygo/build/release/tinygo /tinygo

builder/config.go

@@ -25,8 +25,8 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
 	}
 
 	// Version range supported by TinyGo.
-	const minorMin = 24 // when updating the min version, also update .github/workflows/compat.yml
-	const minorMax = 26
+	const minorMin = 25 // when updating the min version, also update .github/workflows/compat.yml
+	const minorMax = 27
 
 	// Check that we support this Go toolchain version.
 	gorootMajor, gorootMinor, err := goenv.GetGorootVersion()

builder/sizes_test.go

@@ -42,8 +42,8 @@ func TestBinarySize(t *testing.T) {
 	// This is a small number of very diverse targets that we want to test.
 	tests := []sizeTest{
 		// microcontrollers
-		{"hifive1b", "examples/echo", 3699, 297, 0, 2252},
-		{"microbit", "examples/serial", 2736, 356, 8, 2248},
+		{"hifive1b", "examples/echo", 3697, 299, 0, 2252},
+		{"microbit", "examples/serial", 2732, 356, 8, 2248},
 		{"wioterminal", "examples/pininterrupt", 7960, 1652, 132, 7480},
 
 		// TODO: also check wasm. Right now this is difficult, because

compiler/symbol.go

@@ -443,15 +443,18 @@ func (c *compilerContext) parsePragmas(info *functionInfo, f *ssa.Function) {
 			info.inline = inlineHint
 		case "//go:noinline":
 			info.inline = inlineNone
-		case "//go:linkname":
+		case "//go:linkname", "//go:linknamestd":
 			if len(parts) != 3 || parts[1] != f.Name() {
 				continue
 			}
 			// Only enable go:linkname when the package imports "unsafe".
 			// This is a slightly looser requirement than what gc uses: gc
 			// requires the file to import "unsafe", not the package as a
 			// whole.
-			if hasUnsafeImport(f.Pkg.Pkg) {
+			// //go:linknamestd is a Go 1.27+ variant used inside the standard
+			// library (for example by the iter package) that does not require
+			// importing "unsafe".
+			if parts[0] == "//go:linknamestd" || hasUnsafeImport(f.Pkg.Pkg) {
 				info.linkName = parts[2]
 			}
 		case "//go:section":

compiler/testdata/pragma.go

@@ -35,6 +35,12 @@ func withLinkageName1() {
 //go:linkname withLinkageName2 somepkg.someFunction2
 func withLinkageName2()
 
+// Import a function from a different package using go:linknamestd (the standard
+// library variant of go:linkname introduced in Go 1.27).
+//
+//go:linknamestd withLinkageNameStd somepkg.someFunctionStd
+func withLinkageNameStd()
+
 // Function has an 'inline hint', similar to the inline keyword in C.
 //
 //go:inline

compiler/testdata/pragma.ll

@@ -33,6 +33,8 @@ entry:
 
 declare void @somepkg.someFunction2(ptr) #0
 
+declare void @somepkg.someFunctionStd(ptr) #0
+
 ; Function Attrs: inlinehint nounwind
 define hidden void @main.inlineFunc(ptr %context) unnamed_addr #3 {
 entry:

go.mod

@@ -1,6 +1,6 @@
 module github.com/tinygo-org/tinygo
 
-go 1.24.0
+go 1.25.0
 
 require (
 	github.com/aykevl/go-wasm v0.0.2-0.20250317121156-42b86c494139
@@ -18,9 +18,9 @@ require (
 	go.bug.st/serial v1.6.4
 	go.bytecodealliance.org v0.6.2
 	go.bytecodealliance.org/cm v0.2.2
-	golang.org/x/net v0.50.0
-	golang.org/x/sys v0.41.0
-	golang.org/x/tools v0.42.0
+	golang.org/x/net v0.56.0
+	golang.org/x/sys v0.46.0
+	golang.org/x/tools v0.47.0
 	gopkg.in/yaml.v2 v2.4.0
 	tinygo.org/x/espflasher v0.6.1
 	tinygo.org/x/go-llvm v0.0.0-20260422095634-06c6725fe5e6
@@ -48,6 +48,6 @@ require (
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/ulikunitz/xz v0.5.12 // indirect
 	github.com/urfave/cli/v3 v3.0.0-beta1 // indirect
-	golang.org/x/mod v0.33.0 // indirect
-	golang.org/x/text v0.34.0 // indirect
+	golang.org/x/mod v0.37.0 // indirect
+	golang.org/x/text v0.38.0 // indirect
 )

go.sum

@@ -95,24 +95,24 @@ go.bytecodealliance.org v0.6.2 h1:Jy4u5DVmSkXgsnwojBhJ+AD/YsJsR3VzVnxF0xRCqTQ=
 go.bytecodealliance.org v0.6.2/go.mod h1:gqjTJm0y9NSksG4py/lSjIQ/SNuIlOQ+hCIEPQwtJgA=
 go.bytecodealliance.org/cm v0.2.2 h1:M9iHS6qs884mbQbIjtLX1OifgyPG9DuMs2iwz8G4WQA=
 go.bytecodealliance.org/cm v0.2.2/go.mod h1:JD5vtVNZv7sBoQQkvBvAAVKJPhR/bqBH7yYXTItMfZI=
-golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
-golang.org/x/mod v0.33.0/go.mod h1:swjeQEj+6r7fODbD2cqrnje9PnziFuw4bmLbBZFrQ5w=
-golang.org/x/net v0.50.0 h1:ucWh9eiCGyDR3vtzso0WMQinm2Dnt8cFMuQa9K33J60=
-golang.org/x/net v0.50.0/go.mod h1:UgoSli3F/pBgdJBHCTc+tp3gmrU4XswgGRgtnwWTfyM=
-golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
-golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/mod v0.37.0 h1:vF1DjpVEshcIqoEaauuHebaLk1O1forxjxBaVn884JQ=
+golang.org/x/mod v0.37.0/go.mod h1:m8S8VeM9r4dzDwjrKO0a1sZP3YjeMamRRlD+fmR2Q/0=
+golang.org/x/net v0.56.0 h1:Rw8j/hFzGvJUZwNBXnAtf5sVDVt+65SK2C7IxCxZt5o=
+golang.org/x/net v0.56.0/go.mod h1:D3Ku6r+V6JROoZK144D2XfMHFcMq/0zSfLelVTCFKec=
+golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
+golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
-golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
-golang.org/x/text v0.34.0 h1:oL/Qq0Kdaqxa1KbNeMKwQq0reLCCaFtqu2eNuSeNHbk=
-golang.org/x/text v0.34.0/go.mod h1:homfLqTYRFyVYemLBFl5GgL/DWEiH5wcsQ5gSh1yziA=
-golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
-golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
+golang.org/x/sys v0.46.0 h1:noSf2Fq6F8DBgS+LysIkx7rIExoNHJsxOAtPp4rthXw=
+golang.org/x/sys v0.46.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/text v0.38.0 h1:sXmwo9DwP3OK9EZ7PqAdaooSGozfl/3a6/xJcbzPRhE=
+golang.org/x/text v0.38.0/go.mod h1:YXZt3QhHUKYT53r2lLKFIVi6Ao1jdzrTR/KQ09qyxF4=
+golang.org/x/tools v0.47.0 h1:7Kn5x/d1svx/PzryTsqeoZN4TZwqeH5pGWjefhLi/1Q=
+golang.org/x/tools v0.47.0/go.mod h1:dFHnyTvFWY212G+h7ZY4Vsp/K3U4/7W9TyVaAul8uCA=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=

src/runtime/os_darwin_go126.go

@@ -1,4 +1,4 @@
-//go:build darwin && go1.26
+//go:build darwin && (go1.26 || go1.27)
 
 package runtime
 

src/runtime/runtime_windows_go126.go

@@ -1,4 +1,4 @@
-//go:build windows && go1.26
+//go:build windows && (go1.26 || go1.27)
 
 package runtime