Validate separate process support

.github/workflows/build-macos.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0'
+          go-version: '1.27.1'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v5
@@ -131,7 +131,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0'
+          go-version: '1.27.1'
           cache: true
       - name: Build TinyGo (LLVM ${{ matrix.version }})
         run: go install -tags=llvm${{ matrix.version }}

.github/workflows/linux.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0'
+          go-version: '1.27.1'
           cache: true
       - name: Run go mod tidy
         run: go mod tidy
@@ -160,7 +160,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0'
+          go-version: '1.27.1'
           cache: true
       - name: Install wasmtime
         uses: bytecodealliance/actions/wasmtime/setup@v1
@@ -205,7 +205,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0'
+          go-version: '1.27.1'
           cache: true
       - name: Download release artifact
         uses: actions/download-artifact@v8
@@ -244,7 +244,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0'
+          go-version: '1.27.1'
           cache: true
       - name: Install Node.js
         uses: actions/setup-node@v6
@@ -371,7 +371,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0'
+          go-version: '1.27.1'
           cache: true
       - name: Restore LLVM source cache
         uses: actions/cache/restore@v5

.github/workflows/windows.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0'
+          go-version: '1.27.1'
           cache: true
       - name: Restore cached LLVM source
         uses: actions/cache/restore@v5
@@ -129,7 +129,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.27.0'
+          go-version: '1.27.1'
           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: '1.27.0'
+          go-version: '1.27.1'
           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: '1.27.0'
+          go-version: '1.27.1'
           cache: true
       - name: Download TinyGo build
         uses: actions/download-artifact@v8

builder/picolibc.go

@@ -3,7 +3,6 @@ package builder
 import (
 	"os"
 	"path/filepath"
-	"strings"
 
 	"github.com/tinygo-org/tinygo/goenv"
 )
@@ -20,46 +19,35 @@ var libPicolibc = Library{
 		return f.Close()
 	},
 	cflags: func(target, headerPath string) []string {
-		newlibDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/picolibc/newlib")
+		picolibcDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/picolibc")
 		return []string{
 			"-Werror",
 			"-Wall",
 			"-std=gnu11",
-			"-D_COMPILING_NEWLIB",
-			"-D_HAVE_ALIAS_ATTRIBUTE",
-			"-DTINY_STDIO",
-			"-DPOSIX_IO",
-			"-DFORMAT_DEFAULT_INTEGER", // use __i_vfprintf and __i_vfscanf by default
-			"-D_IEEE_LIBM",
+			"-D__TINY_STDIO",
+			"-D_XOPEN_SOURCE=700",
+			"-D__IO_DEFAULT='i'", // use __i_vfprintf and __i_vfscanf by default
+			"-D__IEEE_LIBM",
 			"-D__OBSOLETE_MATH_FLOAT=1", // use old math code that doesn't expect a FPU
 			"-D__OBSOLETE_MATH_DOUBLE=0",
-			"-D_WANT_IO_C99_FORMATS",
+			"-D__IO_C99_FORMATS",
 			"-D__PICOLIBC_ERRNO_FUNCTION=__errno_location",
 			"-nostdlibinc",
-			"-isystem", newlibDir + "/libc/include",
-			"-I" + newlibDir + "/libc/tinystdio",
-			"-I" + newlibDir + "/libm/common",
+			"-isystem", picolibcDir + "/libc/include",
+			"-I" + picolibcDir + "/libc/stdio",
+			"-I" + picolibcDir + "/libc/locale",
+			"-I" + picolibcDir + "/libm/common",
 			"-I" + headerPath,
 		}
 	},
-	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/picolibc/newlib") },
+	sourceDir: func() string { return filepath.Join(goenv.Get("TINYGOROOT"), "lib/picolibc") },
 	librarySources: func(target string, _ bool) ([]string, error) {
-		sources := append([]string(nil), picolibcSources...)
-		if !strings.HasPrefix(target, "avr") {
-			// Small chips without long jumps can't compile many files (printf,
-			// pow, etc). Therefore exclude those source files for those chips.
-			// Unfortunately it's difficult to exclude only some chips, so this
-			// excludes those files on all AVR chips for now.
-			// More information:
-			// https://github.com/llvm/llvm-project/issues/67042
-			sources = append(sources, picolibcSourcesLarge...)
-		}
-		return sources, nil
+		return append([]string(nil), picolibcSources...), nil
 	},
 }
 
 var picolibcSources = []string{
-	"../../picolibc-stdio.c",
+	"../picolibc-stdio.c",
 
 	"libc/string/bcmp.c",
 	"libc/string/bcopy.c",
@@ -126,7 +114,6 @@ var picolibcSources = []string{
 	"libc/string/swab.c",
 	"libc/string/timingsafe_bcmp.c",
 	"libc/string/timingsafe_memcmp.c",
-	"libc/string/u_strerr.c",
 	"libc/string/wcpcpy.c",
 	"libc/string/wcpncpy.c",
 	"libc/string/wcscasecmp.c",
@@ -164,87 +151,82 @@ var picolibcSources = []string{
 	"libc/string/wmempcpy.c",
 	"libc/string/wmemset.c",
 	"libc/string/xpg_strerror_r.c",
-}
 
-// Parts of picolibc that are too large for small AVRs.
-var picolibcSourcesLarge = []string{
-	// srcs_tinystdio
-	"libc/tinystdio/asprintf.c",
-	"libc/tinystdio/bufio.c",
-	"libc/tinystdio/clearerr.c",
-	"libc/tinystdio/ecvt_r.c",
-	"libc/tinystdio/ecvt.c",
-	"libc/tinystdio/ecvtf_r.c",
-	"libc/tinystdio/ecvtf.c",
-	"libc/tinystdio/fcvt.c",
-	"libc/tinystdio/fcvt_r.c",
-	"libc/tinystdio/fcvtf.c",
-	"libc/tinystdio/fcvtf_r.c",
-	"libc/tinystdio/gcvt.c",
-	"libc/tinystdio/gcvtf.c",
-	"libc/tinystdio/fclose.c",
-	"libc/tinystdio/fdevopen.c",
-	"libc/tinystdio/feof.c",
-	"libc/tinystdio/ferror.c",
-	"libc/tinystdio/fflush.c",
-	"libc/tinystdio/fgetc.c",
-	"libc/tinystdio/fgets.c",
-	"libc/tinystdio/fileno.c",
-	"libc/tinystdio/filestrget.c",
-	"libc/tinystdio/filestrput.c",
-	"libc/tinystdio/filestrputalloc.c",
-	"libc/tinystdio/fmemopen.c",
-	"libc/tinystdio/fprintf.c",
-	"libc/tinystdio/fputc.c",
-	"libc/tinystdio/fputs.c",
-	"libc/tinystdio/fread.c",
-	//"libc/tinystdio/freopen.c", // crashes with AVR, see: https://github.com/picolibc/picolibc/pull/369
-	"libc/tinystdio/fscanf.c",
-	"libc/tinystdio/fseek.c",
-	"libc/tinystdio/fseeko.c",
-	"libc/tinystdio/ftell.c",
-	"libc/tinystdio/ftello.c",
-	"libc/tinystdio/fwrite.c",
-	"libc/tinystdio/getchar.c",
-	"libc/tinystdio/gets.c",
-	"libc/tinystdio/matchcaseprefix.c",
-	"libc/tinystdio/mktemp.c",
-	"libc/tinystdio/perror.c",
-	"libc/tinystdio/printf.c",
-	"libc/tinystdio/putchar.c",
-	"libc/tinystdio/puts.c",
-	"libc/tinystdio/rewind.c",
-	"libc/tinystdio/scanf.c",
-	"libc/tinystdio/setbuf.c",
-	"libc/tinystdio/setbuffer.c",
-	"libc/tinystdio/setlinebuf.c",
-	"libc/tinystdio/setvbuf.c",
-	"libc/tinystdio/snprintf.c",
-	"libc/tinystdio/sprintf.c",
-	"libc/tinystdio/snprintfd.c",
-	"libc/tinystdio/snprintff.c",
-	"libc/tinystdio/sprintff.c",
-	"libc/tinystdio/sprintfd.c",
-	"libc/tinystdio/sscanf.c",
-	"libc/tinystdio/strfromf.c",
-	"libc/tinystdio/strfromd.c",
-	"libc/tinystdio/strtof.c",
-	"libc/tinystdio/strtof_l.c",
-	"libc/tinystdio/strtod.c",
-	"libc/tinystdio/strtod_l.c",
-	"libc/tinystdio/ungetc.c",
-	"libc/tinystdio/vasprintf.c",
-	"libc/tinystdio/vfiprintf.c",
-	"libc/tinystdio/vfprintf.c",
-	"libc/tinystdio/vfprintff.c",
-	"libc/tinystdio/vfscanf.c",
-	"libc/tinystdio/vfiscanf.c",
-	"libc/tinystdio/vfscanff.c",
-	"libc/tinystdio/vprintf.c",
-	"libc/tinystdio/vscanf.c",
-	"libc/tinystdio/vsscanf.c",
-	"libc/tinystdio/vsnprintf.c",
-	"libc/tinystdio/vsprintf.c",
+	// srcs_stdio
+	"libc/stdio/asprintf.c",
+	"libc/stdio/bufio.c",
+	"libc/stdio/clearerr.c",
+	"libc/stdio/ecvt_r.c",
+	"libc/stdio/ecvt.c",
+	"libc/stdio/ecvtf_r.c",
+	"libc/stdio/ecvtf.c",
+	"libc/stdio/fcvt.c",
+	"libc/stdio/fcvt_r.c",
+	"libc/stdio/fcvtf.c",
+	"libc/stdio/fcvtf_r.c",
+	"libc/stdio/gcvt.c",
+	"libc/stdio/gcvtf.c",
+	"libc/stdio/fclose.c",
+	"libc/stdio/fdevopen.c",
+	"libc/stdio/feof.c",
+	"libc/stdio/ferror.c",
+	"libc/stdio/fflush.c",
+	"libc/stdio/fgetc.c",
+	"libc/stdio/fgets.c",
+	"libc/stdio/fileno.c",
+	"libc/stdio/filestrget.c",
+	"libc/stdio/filestrput.c",
+	"libc/stdio/filestrputalloc.c",
+	"libc/stdio/fmemopen.c",
+	"libc/stdio/fprintf.c",
+	"libc/stdio/fputc.c",
+	"libc/stdio/fputs.c",
+	"libc/stdio/fread.c",
+	"libc/stdio/freopen.c",
+	"libc/stdio/fscanf.c",
+	"libc/stdio/fseek.c",
+	"libc/stdio/fseeko.c",
+	"libc/stdio/ftell.c",
+	"libc/stdio/ftello.c",
+	"libc/stdio/fwrite.c",
+	"libc/stdio/getchar.c",
+	"libc/stdio/gets.c",
+	"libc/stdio/matchcaseprefix.c",
+	"libc/stdio/mktemp.c",
+	"libc/stdio/perror.c",
+	"libc/stdio/printf.c",
+	"libc/stdio/putchar.c",
+	"libc/stdio/puts.c",
+	"libc/stdio/rewind.c",
+	"libc/stdio/scanf.c",
+	"libc/stdio/setbuf.c",
+	"libc/stdio/setbuffer.c",
+	"libc/stdio/setlinebuf.c",
+	"libc/stdio/setvbuf.c",
+	"libc/stdio/snprintf.c",
+	"libc/stdio/sprintf.c",
+	"libc/stdio/snprintfd.c",
+	"libc/stdio/snprintff.c",
+	"libc/stdio/sprintff.c",
+	"libc/stdio/sprintfd.c",
+	"libc/stdio/sscanf.c",
+	"libc/stdio/strfromf.c",
+	"libc/stdio/strfromd.c",
+	"libc/stdio/strtof.c",
+	"libc/stdio/strtof_l.c",
+	"libc/stdio/strtod.c",
+	"libc/stdio/strtod_l.c",
+	"libc/stdio/ungetc.c",
+	"libc/stdio/vasprintf.c",
+	"libc/stdio/vfiprintf.c",
+	"libc/stdio/vfprintf.c",
+	"libc/stdio/vfscanf.c",
+	"libc/stdio/vfiscanf.c",
+	"libc/stdio/vprintf.c",
+	"libc/stdio/vscanf.c",
+	"libc/stdio/vsscanf.c",
+	"libc/stdio/vsnprintf.c",
+	"libc/stdio/vsprintf.c",
 
 	"libm/common/sf_finite.c",
 	"libm/common/sf_copysign.c",
@@ -256,9 +238,7 @@ var picolibcSourcesLarge = []string{
 	"libm/common/sf_ilogb.c",
 	"libm/common/sf_infinity.c",
 	"libm/common/sf_isinf.c",
-	"libm/common/sf_isinff.c",
 	"libm/common/sf_isnan.c",
-	"libm/common/sf_isnanf.c",
 	"libm/common/sf_issignaling.c",
 	"libm/common/sf_log1p.c",
 	"libm/common/sf_nan.c",
@@ -301,9 +281,7 @@ var picolibcSourcesLarge = []string{
 	"libm/common/s_infinity.c",
 	"libm/common/s_iseqsig.c",
 	"libm/common/s_isinf.c",
-	"libm/common/s_isinfd.c",
 	"libm/common/s_isnan.c",
-	"libm/common/s_isnand.c",
 	"libm/common/s_issignaling.c",
 	"libm/common/s_log1p.c",
 	"libm/common/s_nan.c",
@@ -359,7 +337,6 @@ var picolibcSourcesLarge = []string{
 	"libm/math/k_sin.c",
 	"libm/math/k_tan.c",
 	"libm/math/kf_cos.c",
-	"libm/math/kf_rem_pio2.c",
 	"libm/math/kf_sin.c",
 	"libm/math/kf_tan.c",
 	"libm/math/s_acos.c",

compileopts/config.go

@@ -25,6 +25,7 @@ import (
 var libVersions = map[string]int{
 	"musl":         3,
 	"bdwgc":        2,
+	"picolibc":     1,
 	"wasmbuiltins": 1,
 }
 
@@ -384,13 +385,13 @@ func (c *Config) LibcCFlags() []string {
 		}
 	case "picolibc":
 		root := goenv.Get("TINYGOROOT")
-		picolibcDir := filepath.Join(root, "lib", "picolibc", "newlib", "libc")
+		picolibcDir := filepath.Join(root, "lib", "picolibc", "libc")
 		path := c.LibraryPath("picolibc")
 		return []string{
 			"-nostdlibinc",
 			"-isystem", filepath.Join(path, "include"),
 			"-isystem", filepath.Join(picolibcDir, "include"),
-			"-isystem", filepath.Join(picolibcDir, "tinystdio"),
+			"-isystem", filepath.Join(picolibcDir, "stdio"),
 			"-D__PICOLIBC_ERRNO_FUNCTION=__errno_location",
 		}
 	case "musl":