CGO_LDFLAGS environment variables are added to the flags derived from
these directives. Package-specific flags should be set using the
directives, not the environment variables, so that builds work in
unmodified environments. Flags obtained from environment variables
are not subject to the security limitations described above.

All the cgo CPPFLAGS and CFLAGS directives in a package are concatenated and

 	}
       else
 	++ep;
+  }
 
   UNLOCK;
 
diff --git a/support/Makefile b/support/Makefile
index a253698..2f4e2a9 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -167,13 +167,6 @@ CFLAGS-support_paths.c = \
 		-DINSTDIR_PATH=\"$(prefix)\" \
 		-DLIBDIR_PATH=\"$(libdir)\"
 
-ifeq (,$(CXX))
-LINKS_DSO_PROGRAM = links-dso-program-c
-else
-LINKS_DSO_PROGRAM = links-dso-program

			}
			args[i] = arg
		}

		switch verb {
		case "CFLAGS", "CPPFLAGS", "CXXFLAGS", "FFLAGS", "LDFLAGS":
			// Change relative paths to absolute.
			ctxt.makePathsAbsolute(args, di.Dir)
		}

		switch verb {
		case "CFLAGS":
			di.CgoCFLAGS = append(di.CgoCFLAGS, args...)
		case "CPPFLAGS":
			di.CgoCPPFLAGS = append(di.CgoCPPFLAGS, args...)

	CGO_CFLAGS
		Flags that cgo will pass to the compiler when compiling
		C code.
	CGO_CFLAGS_ALLOW
		A regular expression specifying additional flags to allow
		to appear in #cgo CFLAGS source code directives.
		Does not apply to the CGO_CFLAGS environment variable.
	CGO_CFLAGS_DISALLOW
		A regular expression specifying flags that must be disallowed

TEXT ·x(SB),0,$0
        CALL foo(SB)
        RET
`)
	write("x.c", `
void undefined();

void foo() {
        undefined();
}
`)

	cc := strings.TrimSpace(runGo("env", "CC"))
	cflags := strings.Fields(runGo("env", "GOGCCFLAGS"))

	importcfgfile := filepath.Join(tmpdir, "importcfg")
	testenv.WriteImportcfg(t, importcfgfile, nil, "runtime")

	// Compile, assemble and pack the Go and C code.

		}
	case "darwin", "ios":
		f, err := macho.Open(obj)
		if err != nil {
			t.Fatal(err)
		}
		defer f.Close()
		if f.Flags&macho.FlagDyldLink == 0 {
			t.Error("PIE must have DyldLink flag, but not")
		}
		if f.Flags&macho.FlagPIE == 0 {
			t.Error("PIE must have PIE flag, but not")
		}
	case "windows":
		f, err := pe.Open(obj)
		if err != nil {
			t.Fatal(err)

	}
	if strings.HasPrefix(s, "sizeof_") {
		return "sizeof(" + cname(s[len("sizeof_"):]) + ")"
	}
	return s
}

// ProcessCgoDirectives processes the import C preamble:
//  1. discards all #cgo CFLAGS, LDFLAGS, nocallback and noescape directives,
//     so they don't make their way into _cgo_export.h.
//  2. parse the nocallback and noescape directives.
func (f *File) ProcessCgoDirectives() {

	uc_onstack  int32
	uc_sigmask  uint32
	uc_stack    stackt
	uc_link     *ucontext
	uc_mcsize   uint64
	uc_mcontext *mcontext64
}

type keventt struct {
	ident  uint64
	filter int16
	flags  uint16
	fflags uint32
	data   int64
	udata  *byte
}

type pthread uintptr
type pthreadattr struct {
	X__sig    int64
	X__opaque [56]int8
}
type pthreadmutex struct {
	X__sig    int64

			// Generate a PIC stub. This is ugly as the stub must determine its location using
			// POWER8 or older instruction. These stubs are likely the combination of using
			// GOPPC64 < 8 and linking external objects built with CFLAGS="... -mcpu=power10 ..."
			stub.AddUint32(ctxt.Arch, OP_MFLR_R0)  // mflr r0
			stub.AddUint32(ctxt.Arch, OP_BCL_NIA)  // bcl 20,31,1f

    absl::flat_hash_set<std::string> xla_compile_and_run_allowed_devices_;
  } tf_xla_use_device_api;
};

// Flags for the XlaCallModule kernel.
struct XlaCallModuleFlags {
  // Used by XlaCallModuleOp to specify safety checks to disable.
  absl::flat_hash_set<std::string> disabled_checks;
};

// Flags for the build_xla_ops pass.
struct BuildXlaOpsPassFlags {