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feat: support libc for small devices

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This commit is contained in:
Haolan
2025-08-28 20:11:13 +08:00
parent 5587fd2885
commit f3ecce86ee
15 changed files with 1536 additions and 746 deletions
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67
internal/crosscompile/crosscompile.go
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@@ -8,11 +8,8 @@ import (
"os/exec"
"path/filepath"
"runtime"
"slices"
"strings"
"github.com/goplus/llgo/internal/clang"
"github.com/goplus/llgo/internal/env"
"github.com/goplus/llgo/internal/targets"
"github.com/goplus/llgo/internal/xtool/llvm"
@@ -218,67 +215,33 @@ func getESPClangPlatform(goos, goarch string) string {
return ""
}
func getOrCompileLibc(cc, linkerName, libcName string, ccflags, exportLdFlags []string) (ldflags []string, err error) {
func ldFlagsFromFileName(fileName string) string {
return strings.TrimPrefix(strings.TrimSuffix(fileName, ".a"), "lib")
}
func getOrCompileLibc(cc, linkerName, libcName string, exportCCFlags, exportLDFlags []string) (ldflags []string, err error) {
baseDir := filepath.Join(cacheRoot(), "crosscompile")
libcDir := filepath.Join(baseDir, libcName)
libcArchive := filepath.Join(libcDir, "libc.a")
// fast-path: compiled already
if _, err = os.Stat(libcArchive); !os.IsNotExist(err) {
ldflags = append(ldflags, "-nostdlib", "-L", libcDir, "-lc")
return ldflags, nil
}
outputDir := filepath.Join(baseDir, libcName)
compileConfig, err := getCompileLibcConfigByName(baseDir, libcName)
if err != nil {
return
}
tempDir, err := os.MkdirTemp("", "compile*")
if err != nil {
if err = checkDownloadAndExtractLibc(compileConfig, compileConfig.Url, outputDir, compileConfig.ArchiveSrcDir); err != nil {
return
}
defer os.RemoveAll(tempDir)
ldflags = append(ldflags, "-nostdlib", "-L"+outputDir)
fmt.Fprintf(os.Stderr, "%s not found in LLGO_ROOT or cache, will download and compile.\n", libcDir)
if err = checkDownloadAndExtractLibc(compileConfig.Url, libcDir, compileConfig.ArchiveSrcDir); err != nil {
return
}
compileLDFlags := append(slices.Clone(exportLdFlags), compileConfig.LDFlags...)
cfg := clang.NewConfig(cc, ccflags, compileConfig.CFlags, compileLDFlags, linkerName)
var objFiles []string
compiler := clang.NewCompiler(cfg)
linker := clang.NewLinker(cfg)
compiler.Verbose = true
linker.Verbose = true
fmt.Fprintf(os.Stderr, "Start to compile libc %s to %s...\n", libcName, libcArchive)
for _, file := range compileConfig.Files {
var tempObjFile *os.File
tempObjFile, err = os.CreateTemp(tempDir, "libc*.o")
for _, group := range compileConfig.Groups {
err = group.Compile(outputDir, cc, linkerName, exportCCFlags, exportLDFlags)
if err != nil {
return
break
}
fmt.Fprintf(os.Stderr, "Compile libc file %s to %s...\n", file, tempObjFile.Name())
err = compiler.Compile("-o", tempObjFile.Name(), "-x", "c", "-c", file)
if err != nil {
return
if filepath.Ext(group.OutputFileName) == ".o" {
continue
}
objFiles = append(objFiles, tempObjFile.Name())
ldflags = append(ldflags, "-l"+ldFlagsFromFileName(group.OutputFileName))
}
args := []string{"-o", libcArchive}
args = append(args, objFiles...)
err = linker.Link(args...)
if err != nil {
return
}
ldflags = append(ldflags, "-nostdlib", "-L", libcDir, "-lc")
return
}