cargo_build_script: Add regression test for revert #2925 (#2936)

#2931 added tests for _pwd_flags, however 
the test as-is passes with #2911 and #2922,
which still caused problems and reverted.
Here I introduce a test case for likely
unfixed in reverted #2925.

The test needs strictter check for cflags. As-ls
`flag in cflags` is a just substring search and
very weak test for abs path.

For #2917

test/cargo_build_script/cc_args_and_env/BUILD.bazel

@@ -5,13 +5,16 @@ load(
  "isystem_absolute_test",
  "isystem_relative_test",
  "sysroot_absolute_test",
+ "sysroot_next_absolute_test",
  "sysroot_relative_test",
 )
 
 sysroot_relative_test(name = "sysroot_relative_test")
 
 sysroot_absolute_test(name = "sysroot_absolute_test")
 
+sysroot_next_absolute_test(name = "sysroot_next_absolute_test")
+
 isystem_relative_test(name = "isystem_relative_test")
 
 isystem_absolute_test(name = "isystem_absolute_test")

test/cargo_build_script/cc_args_and_env/cc_args_and_env_test.bzl

@@ -83,7 +83,7 @@ def _cc_args_and_env_analysis_test_impl(ctx):
  env = analysistest.begin(ctx)
  tut = analysistest.target_under_test(env)
  cargo_action = tut[DepActionsInfo].actions[0]
- cflags = cargo_action.env["CFLAGS"]
+ cflags = cargo_action.env["CFLAGS"].split(" ")
  for flag in ctx.attr.expected_cflags:
  asserts.true(
  env,
@@ -173,6 +173,17 @@ def sysroot_absolute_test(name):
  expected_cflags = ["--sysroot=/test/absolute/sysroot"],
  )
 
+def sysroot_next_absolute_test(name):
+ cargo_build_script_with_extra_cc_compile_flags(
+ name = "%s/cargo_build_script" % name,
+ extra_cc_compile_flags = ["--sysroot=/test/absolute/sysroot", "test/relative/another"],
+ )
+ cc_args_and_env_analysis_test(
+ name = name,
+ target_under_test = "%s/cargo_build_script" % name,
+ expected_cflags = ["--sysroot=/test/absolute/sysroot", "test/relative/another"],
+ )
+
 def isystem_relative_test(name):
  cargo_build_script_with_extra_cc_compile_flags(
  name = "%s/cargo_build_script" % name,
@@ -181,7 +192,7 @@ def isystem_relative_test(name):
  cc_args_and_env_analysis_test(
  name = name,
  target_under_test = "%s/cargo_build_script" % name,
- expected_cflags = ["-isystem ${pwd}/test/relative/path"],
+ expected_cflags = ["-isystem", "${pwd}/test/relative/path"],
  )
 
 def isystem_absolute_test(name):
@@ -192,7 +203,7 @@ def isystem_absolute_test(name):
  cc_args_and_env_analysis_test(
  name = name,
  target_under_test = "%s/cargo_build_script" % name,
- expected_cflags = ["-isystem /test/absolute/path"],
+ expected_cflags = ["-isystem", "/test/absolute/path"],
  )
 
 def fsanitize_ignorelist_relative_test(name):