tree e0822731d02bef69ffc82e3d9a8287dea922a7a8
parent 0eb91f4e91f2473c78be0ac61098fdc7cb2123aa
author Dan Willemsen <dwillemsen@google.com> 1585017738 -0700
committer Dan Willemsen <dwillemsen@google.com> 1586464238 -0700

soong config: add value_variable substitution

There are some cases that aren't handled with the existing variable
types for booleans or known lists of strings. Similarly to our
product_variables that uses %s / %d for things like
PLATFORM_SDK_VERSION, allow vendors to define their own config variables
to be substituted into properties.

For example, some of the makefiles that I've attempted to convert had
the option to pass in version numbers from the board, or the default
display size:

  -DDISPLAY_VERSION=550
  -DDISP_H=1080

These examples happen to be integers, but since our configuration
language (make) doesn't support numbers, %s works just as well.

This change will allow the above to be represented using:

  soong_config_module_type {
      name: "acme_cc_defaults",
      module_type: "cc_defaults",
      config_namespace: "acme",
      value_variables: [
          "DISPLAY_VERSION",
	  "DISP_H",
      ],
      properties: ["cflags"],
  }

  acme_cc_defaults {
      name: "my_defaults",
      soong_config_variables: {
          DISPLAY_VERSION: {
	      cflags: ["-DDISPLAY_VERSION=%s"],
	  },
	  DISP_H: {
	      cflags: ["-DDISP_H=%s"],
	  }
      },
  }

Bug: 153161144
Test: built-in tests
Change-Id: I18f35746b5cc39c304a136980249e886d38c6df6
Merged-In: I18f35746b5cc39c304a136980249e886d38c6df6
(cherry picked from commit b0935db8c3838e90582fdece217bc956ba951f07)