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package builder
import (
"bytes"
"fmt"
"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{
name: "musl",
makeHeaders: func(target, includeDir string) error {
bits := filepath.Join(includeDir, "bits")
err := os.Mkdir(bits, 0777)
if err != nil {
return err
}
arch := compileopts.MuslArchitecture(target)
muslDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib", "musl")
// Create the file alltypes.h.
f, err := os.Create(filepath.Join(bits, "alltypes.h"))
if err != nil {
return err
}
infiles := []string{
filepath.Join(muslDir, "arch", arch, "bits", "alltypes.h.in"),
filepath.Join(muslDir, "include", "alltypes.h.in"),
}
for _, infile := range infiles {
data, err := os.ReadFile(infile)
if err != nil {
return err
}
lines := strings.Split(string(data), "\n")
for _, line := range lines {
if strings.HasPrefix(line, "TYPEDEF ") {
matches := regexp.MustCompile(`TYPEDEF (.*) ([^ ]*);`).FindStringSubmatch(line)
value := matches[1]
name := matches[2]
line = fmt.Sprintf("#if defined(__NEED_%s) && !defined(__DEFINED_%s)\ntypedef %s %s;\n#define __DEFINED_%s\n#endif\n", name, name, value, name, name)
}
if strings.HasPrefix(line, "STRUCT ") {
matches := regexp.MustCompile(`STRUCT * ([^ ]*) (.*);`).FindStringSubmatch(line)
name := matches[1]
value := matches[2]
line = fmt.Sprintf("#if defined(__NEED_struct_%s) && !defined(__DEFINED_struct_%s)\nstruct %s %s;\n#define __DEFINED_struct_%s\n#endif\n", name, name, name, value, name)
}
f.WriteString(line + "\n")
}
}
f.Close()
// Create the file syscall.h.
f, err = os.Create(filepath.Join(bits, "syscall.h"))
if err != nil {
return err
}
data, err := os.ReadFile(filepath.Join(muslDir, "arch", arch, "bits", "syscall.h.in"))
if err != nil {
return err
}
_, err = f.Write(bytes.ReplaceAll(data, []byte("__NR_"), []byte("SYS_")))
if err != nil {
return err
}
f.Close()
return nil
},
cflags: func(target, headerPath string) []string {
arch := compileopts.MuslArchitecture(target)
muslDir := filepath.Join(goenv.Get("TINYGOROOT"), "lib/musl")
cflags := []string{
"-std=c99", // same as in musl
"-D_XOPEN_SOURCE=700", // same as in musl
// Musl triggers some warnings and we don't want to show any
// warnings while compiling (only errors or silence), so disable
// specific warnings that are triggered in musl.
"-Werror",
"-Wno-logical-op-parentheses",
"-Wno-bitwise-op-parentheses",
"-Wno-shift-op-parentheses",
"-Wno-ignored-attributes",
"-Wno-string-plus-int",
"-Wno-ignored-pragmas",
"-Wno-tautological-constant-out-of-range-compare",
"-Qunused-arguments",
// Select include dirs. Don't include standard library includes
// (that would introduce host dependencies and other complications),
// but do include all the include directories expected by musl.
"-nostdlibinc",
"-I" + muslDir + "/arch/" + arch,
"-I" + muslDir + "/arch/generic",
"-I" + muslDir + "/src/include",
"-I" + muslDir + "/src/internal",
"-I" + headerPath,
"-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") },
librarySources: func(target string) ([]string, error) {
arch := compileopts.MuslArchitecture(target)
globs := []string{
"env/*.c",
"errno/*.c",
"exit/*.c",
"internal/defsysinfo.c",
"internal/libc.c",
"internal/syscall_ret.c",
"internal/vdso.c",
"legacy/*.c",
"malloc/*.c",
"malloc/mallocng/*.c",
"mman/*.c",
"math/*.c",
"signal/*.c",
"stdio/*.c",
"string/*.c",
"thread/" + arch + "/*.s",
"thread/*.c",
"time/*.c",
"unistd/*.c",
}
if arch == "arm" {
// These files need to be added to the start for some reason.
globs = append([]string{"thread/arm/*.c"}, globs...)
}
var sources []string
seenSources := map[string]struct{}{}
basepath := goenv.Get("TINYGOROOT") + "/lib/musl/src/"
for _, pattern := range globs {
matches, err := filepath.Glob(basepath + pattern)
if err != nil {
// From the documentation:
// > Glob ignores file system errors such as I/O errors reading
// > directories. The only possible returned error is
// > ErrBadPattern, when pattern is malformed.
// So the only possible error is when the (statically defined)
// pattern is wrong. In other words, a programming bug.
return nil, fmt.Errorf("musl: could not glob source dirs: %w", err)
}
if len(matches) == 0 {
return nil, fmt.Errorf("musl: did not find any files for pattern %#v", pattern)
}
for _, match := range matches {
relpath, err := filepath.Rel(basepath, match)
if err != nil {
// Not sure if this is even possible.
return nil, err
}
// Make sure architecture specific files override generic files.
id := strings.ReplaceAll(relpath, "/"+arch+"/", "/")
if _, ok := seenSources[id]; ok {
// Already seen this file, skipping this (generic) file.
continue
}
seenSources[id] = struct{}{}
sources = append(sources, relpath)
}
}
return sources, nil
},
crt1Source: "../crt/crt1.c", // lib/musl/crt/crt1.c
}
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