tools: teach gyp to write an 'all deps' rule

Make GYP write a .deps file in the top-level directory that we can use
in the Makefile to get a proper dependency chain for the `node` target.
Preparatory work for getting rid of recursive make invocations.
PR-URL: #17407
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

Author: bnoordhuis

tools/gyp/pylib/gyp/generator/make.py

@@ -2136,6 +2136,7 @@ def CalculateMakefilePath(build_file, base_name):
 fortargetingyp.common.AllTargets(target_list, target_dicts, build_file):
 needed_targets.add(target)
 
+all_deps=set()
 build_files=set()
 include_list=set()
 forqualified_targetintarget_list:
@@ -2184,6 +2185,12 @@ def CalculateMakefilePath(build_file, base_name):
 os.path.dirname(makefile_path))
 include_list.add(mkfile_rel_path)
 
+if'actions'inspec:
+foractioninspec['actions']:
+all_deps.update(map(writer.Absolutify, action['inputs']))
+if'sources'inspec:
+all_deps.update(map(writer.Absolutify, spec['sources']))
+
 # Write out per-gyp (sub-project) Makefiles.
 depth_rel_path=gyp.common.RelativePath(options.depth, os.getcwd())
 forbuild_fileinbuild_files:
@@ -2227,3 +2234,10 @@ def CalculateMakefilePath(build_file, base_name):
 root_makefile.write(SHARED_FOOTER)
 
 root_makefile.close()
+
+# Hack to get rid of $(obj)/path/to/foo.o deps that node.gyp adds manually.
+all_deps= [sforsinall_depsifnot'$'ins]
+all_deps_path=os.path.join(options.toplevel_dir, '.deps')
+withopen(all_deps_path, 'w') asf:
+f.write('ALL_DEPS := \\\n\t')
+f.write(' \\\n\t'.join(sorted(all_deps)))