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"""
Tests that the import-std-module=fallback setting is only showing the error
diagnostics from the first parse attempt which isn't using a module.
This is supposed to prevent that a broken libc++ module renders failing
expressions useless as the original failing errors are suppressed by the
module build errors.
"""
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
import os
class TestCase(TestBase):
# We only emulate a fake libc++ in this test and don't use the real libc++,
# but we still add the libc++ category so that this test is only run in
# test configurations where libc++ is actually supposed to be tested.
@add_test_categories(["libc++"])
@skipIfRemote
@skipIf(compiler=no_match("clang"))
def test(self):
self.build()
sysroot = os.path.join(os.getcwd(), "root")
# Set the sysroot this test is using to provide a custom libc++.
self.runCmd(
"platform select --sysroot '" + sysroot + "' host", CURRENT_EXECUTABLE_SET
)
lldbutil.run_to_source_breakpoint(
self, "// Set break point at this line.", lldb.SBFileSpec("main.cpp")
)
# The expected error message when the fake libc++ module in this test
# fails to build from within LLDB (as it contains invalid code).
module_build_error_msg = "unknown type name 'random_token_to_fail_the_build'"
# First force the std module to be imported. This should show the
# module build error to the user.
self.runCmd("settings set target.import-std-module true")
self.expect(
"expr (size_t)v.size()", substrs=[module_build_error_msg], error=True
)
# In the fallback mode the module build error should not be shown.
self.runCmd("settings set target.import-std-module fallback")
fallback_expr = "expr v ; error_to_trigger_fallback_mode"
# First check for the actual expression error that should be displayed
# and is useful for the user.
self.expect(
fallback_expr,
substrs=["use of undeclared identifier 'error_to_trigger_fallback_mode'"],
error=True,
)
# Test that the module build error is not displayed.
self.expect(
fallback_expr, substrs=[module_build_error_msg], matching=False, error=True
)
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