Method appendLibDir

buildsystems/buildconfig_envs.go:444–506

(libDir string)

}

func (b *BuildConfig) appendLibDir(libDir string) {
	// Windows: MSVC/Clang-cl ----------- Linux: GCC/Clang
	// LIB=xxx\lib;%LIB% ---------------- -L "xxx/lib"
	// LINK=mylib.lib %LINK% ------------ -l "mylib"

	// Toolchain may throw error if lib dir not exists.
	if !fileio.PathExists(libDir) {
		return
	}

	toolchain := b.Ctx.Platform().GetToolchain()
	switch toolchain.GetName() {
	case "gcc", "clang", "qcc":
		ldflags := os.Getenv("LDFLAGS")
		parts := strings.Fields(ldflags)

		// -L flag: used to specify the directory that libraries looking for directly.
		linkFlag := "-L" + libDir

		// -Wl,-rpath-link, used to specify the directory that libraries looking for indirectly.
		rpathlinkFlag := "-Wl,-rpath-link," + libDir

		// Check if this is a dependency lib dir (tmpDeps/lib) - if so, prepend it.
		tmpDepsPrefix := filepath.Join(dirs.TmpDepsDir, b.PortConfig.LibraryDir)
		isDepsLibDir := strings.Contains(libDir, tmpDepsPrefix)

		// Prepend dependency lib dir flags to prioritize them.
		var newAppended = false
		if !slices.Contains(parts, linkFlag) {
			if isDepsLibDir {
				parts = append([]string{linkFlag}, parts...)
			} else {
				parts = append(parts, linkFlag)
			}
			newAppended = true
		}
		if !slices.Contains(parts, rpathlinkFlag) {
			if isDepsLibDir {
				parts = append([]string{rpathlinkFlag}, parts...)
			} else {
				parts = append(parts, rpathlinkFlag)
			}
			newAppended = true
		}

		// Update environment variable with modified flags.
		if newAppended {
			b.envBackup.setenv("LDFLAGS", strings.Join(parts, " "))
		}

	case "msvc", "clang-cl":
		libs := os.Getenv("LIB")
		parts := strings.Fields(libs)

		if !slices.Contains(parts, libDir) {
			parts = append(parts, libDir)
			b.envBackup.setenv("LIB", strings.Join(parts, ";"))
		}