Method msvcEnvs

buildsystems/buildconfig.go:925–1028

msvcEnvs provider the MSVC environment variables required by msys2.

()

// msvcEnvs provider the MSVC environment variables required by msys2.
func (b BuildConfig) msvcEnvs() (string, error) {
	// Append args if exist.
	var args []string
	var appendEnv = func(envKey, envValue string) {
		if envValue != "" {
			args = append(args, fmt.Sprintf(`%s="%s"`, envKey, envValue))
		}
	}

	var cflags, cxxflags, ldflags []string

	// Set CFLAGS/CXXFLAGS/LDFLAGS.
	tmpDepsDir := filepath.Join(dirs.TmpDepsDir, b.PortConfig.LibraryDir)
	var appendIncludeDir = func(includeDir string) {
		includeDir = fileio.ToCygpath(includeDir)
		includeFlag := "-I" + includeDir
		cflags = append(cflags, includeFlag)
		cxxflags = append(cxxflags, includeFlag)
	}
	var appendLibDir = func(libdir string) {
		libdir = fileio.ToCygpath(libdir)
		lFlag := "-L" + libdir
		rFlag := "-Wl,-rpath-link," + libdir

		// Add -L/rpath-link flag.
		if !slices.Contains(ldflags, lFlag) {
			ldflags = append(ldflags, lFlag)
		}
		if !slices.Contains(ldflags, rFlag) {
			ldflags = append(ldflags, rFlag)
		}
	}

	var (
		toolchain = b.Ctx.Platform().GetToolchain()
		rootfs    = b.Ctx.Platform().GetRootFS()
	)

	// sysroot and tmp dir.
	if b.DevDep || b.HostDev {
		// Append CFLAGS/CXXFLAGS/LDFLAGS
		appendIncludeDir(filepath.Join(tmpDepsDir, "include"))
		appendLibDir(filepath.Join(tmpDepsDir, "lib"))
	} else if rootfs != nil {
		// Update CFLAGS/CXXFLAGS
		sysrootDir := rootfs.GetAbsDir()
		appendIncludeDir(filepath.Join(tmpDepsDir, "include"))
		for _, dir := range rootfs.GetIncludeDirs() {
			appendIncludeDir(filepath.Join(sysrootDir, dir))
		}

		// Append LDFLAGS
		appendLibDir(filepath.Join(tmpDepsDir, "lib"))
		for _, dir := range rootfs.GetLibDirs() {
			appendLibDir(filepath.Join(sysrootDir, dir))
		}
	}
	appendEnv("CFLAGS", strings.Join(cflags, " "))