Method SetEnvs

configs/toolchain.go:492–613

(rootfs context.RootFS, buildsystem string, portEnvs []string)

}

func (t Toolchain) SetEnvs(rootfs context.RootFS, buildsystem string, portEnvs []string) {
	crosstoolPrefix := t.GetCrosstoolPrefix()
	cc := t.GetCC()
	cxx := t.GetCXX()

	// Capture CC/CXX from portEnvs if they are set.
	for _, env := range portEnvs {
		if before, after, ok := strings.Cut(env, "="); ok {
			switch strings.TrimSpace(before) {
			case "CC":
				cc = strings.TrimSpace(after)
			case "CXX":
				cxx = strings.TrimSpace(after)
			}
		}
	}

	// cross tool prefix maybe empty for msvc in windows.
	if crosstoolPrefix != "" {
		os.Setenv("CROSSTOOL_PREFIX", crosstoolPrefix)
	}
	os.Setenv("HOST", t.GetHost())

	// For CMake, compiler tools are defined in toolchain_file.cmake, skip environment variable setup.
	if buildsystem == "cmake" {
		return
	}

	var ccFlags, cxxFlags []string
	if t.ctx.CCacheEnabled() {
		// For Windows + MSVC with Makefiles, don't set ccache in CC/CXX environment variables,
		// because MSYS2 shell cannot handle "ccache cl.exe" as a command.
		if runtime.GOOS == "windows" && (t.GetName() == "msvc" || t.GetName() == "clang-cl") && buildsystem == "makefiles" {
			os.Setenv("CC", cc)
			os.Setenv("CXX", cxx)
		} else {
			ccFlags = append(ccFlags, "ccache", cc)
			cxxFlags = append(cxxFlags, "ccache", cxx)

			if rootfs != nil {
				ccFlags = append(ccFlags, "--sysroot="+rootfs.GetAbsDir())
				cxxFlags = append(cxxFlags, "--sysroot="+rootfs.GetAbsDir())

				// For Clang, add --gcc-toolchain to help find GCC runtime files (crtbeginS.o, etc.)
				if t.GetName() == "clang" {
					ccFlags = append(ccFlags, "--gcc-toolchain=/usr")
					cxxFlags = append(cxxFlags, "--gcc-toolchain=/usr")
				}

				// For clang with lld, add LLVM runtime library flags.
				if t.GetName() == "clang" && strings.Contains(t.GetLD(), "lld") {
					ccFlags = append(ccFlags, "-fuse-ld=lld", "--rtlib=compiler-rt", "--unwindlib=libunwind")
					cxxFlags = append(cxxFlags, "-stdlib=libc++", "-fuse-ld=lld", "--rtlib=compiler-rt", "--unwindlib=libunwind")
				}
			}
			os.Setenv("CC", strings.Join(ccFlags, " "))
			os.Setenv("CXX", strings.Join(cxxFlags, " "))
		}