objcopy: '...': No such file on injectPath

[mirusu400]

Hi, I'm attempting to build ardupilot using gllvm, but it doesn't works well. Here are debug outputs first:

[  67/2871] Compiling libraries/AP_Baro/AP_Baro_MS5611.cpp
WARNING:Did not recognize the compiler flag: -cl-single-precision-constant
objcopy: 'AP_Baro_BMP280.o': No such file
WARNING:attachBitcodePathToObject: objcopy [--add-section .llvm_bc=/tmp/gllvm1039652140 AP_Baro_BMP280.o] failed because exit status 1

[  68/2871] Compiling libraries/AP_Baro/AP_Baro_BMP085.cpp
WARNING:Did not recognize the compiler flag: -cl-single-precision-constant
objcopy: 'AP_Baro_SPL06.o': No such file
WARNING:attachBitcodePathToObject: objcopy [--add-section .llvm_bc=/tmp/gllvm2567432848 AP_Baro_SPL06.o] failed because exit status 1


...

Here are some sample to raise this error

# (Clone ardupilot with --recursive-submodules first)
export CC=gclang
export CXX=gclang++
./waf configure --board=SITL --debug -g --check-verbose --disable-Werror
./waf configure --check-cxx-compiler=clang++ --check-c-compiler=clang --board=SITL --debug -g --check-verbose --disable-Werror

./waf

gllvm/shared/compiler.go

Lines 188 to 255 in 7bb6e19

	func injectPath(extension, bcFile, objFile string) (success bool) {
	success = false
	// Store bitcode path to temp file
	var absBcPath, _ = filepath.Abs(bcFile)
	tmpContent := []byte(absBcPath + "\n")
	tmpFile, err := os.CreateTemp("", "gllvm")
	if err != nil {
	LogError("attachBitcodePathToObject: %v\n", err)
	return
	}
	defer CheckDefer(func() error { return os.Remove(tmpFile.Name()) })
	if _, err := tmpFile.Write(tmpContent); err != nil {
	LogError("attachBitcodePathToObject: %v\n", err)
	return
	}
	if err := tmpFile.Close(); err != nil {
	LogError("attachBitcodePathToObject: %v\n", err)
	return
	}
	// Let's write the bitcode section
	var attachCmd string
	var attachCmdArgs []string
	if runtime.GOOS == osDARWIN {
	if len(LLVMLd) > 0 {
	attachCmd = LLVMLd
	} else {
	attachCmd = "ld"
	}
	attachCmdArgs = []string{"-r", "-keep_private_externs", objFile, "-sectcreate", DarwinSegmentName, DarwinSectionName, tmpFile.Name(), "-o", objFile}
	} else {
	if len(LLVMObjcopy) > 0 {
	attachCmd = LLVMObjcopy
	} else {
	attachCmd = "objcopy"
	}
	attachCmdArgs = []string{"--add-section", ELFSectionName + "=" + tmpFile.Name(), objFile}
	}
	// Run the attach command and ignore errors
	_, nerr := execCmd(attachCmd, attachCmdArgs, "")
	if nerr != nil {
	LogWarning("attachBitcodePathToObject: %v %v failed because %v\n", attachCmd, attachCmdArgs, nerr)
	return
	}
	// Copy bitcode file to store, if necessary
	if bcStorePath := LLVMBitcodeStorePath; bcStorePath != "" {
	destFilePath := path.Join(bcStorePath, getHashedPath(absBcPath))
	in, _ := os.Open(absBcPath)
	defer CheckDefer(func() error { return in.Close() })
	out, _ := os.Create(destFilePath)
	defer CheckDefer(func() error { return out.Close() })
	_, err := io.Copy(out, in)
	if err != nil {
	LogWarning("Copying bc to bitcode archive %v failed because %v\n", destFilePath, err)
	return
	}
	err = out.Sync()
	if err != nil {
	LogWarning("Syncing bitcode archive %v failed because %v\n", destFilePath, err)
	return
	}
	}
	success = true
	return
	}

In some quick debugging, I've found that objFile argument injectPath cannot recognize correct path, so it raise error.

Does the error appear only in this project? Is there a solution by specifying environmental variables?

Thank you!