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lit — LLVM integrated tester for executing LLVM and Clang style test suites, summarizing results. Part of

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the lit command: LLVM integrated tester for executing LLVM and Clang style test suites, summarizing results. Part of LLVM. More information: <https://www.llvm.org/docs/CommandGuide/lit.html>.

Solution

lit — LLVM integrated tester for executing LLVM and Clang style test suites, summarizing results. Part of LLVM. More information: <https://www.llvm.org/docs/CommandGuide/lit.html>.

Run a specified test case:

lit {{path/to/test_file.test}}

Run all test cases in a specified directory:

lit {{path/to/test_suite}}

Run all test cases and check the wall time for each cases, then report to summary output:

lit {{path/to/test_suite}} --time-tests

Run individual tests with Valgrind (memory check and memory leak test):

lit {{path/to/test_file.test}} --vg --vg-leak --vg-args={{args_to_valgrind}}

Code Snippets

Run a specified test case

lit {{path/to/test_file.test}}

Run all test cases in a specified directory

lit {{path/to/test_suite}}

Run all test cases and check the wall time for each cases, then report to summary output

lit {{path/to/test_suite}} --time-tests

Run individual tests with Valgrind (memory check and memory leak test)

lit {{path/to/test_file.test}} --vg --vg-leak --vg-args={{args_to_valgrind}}

Context

tldr-pages: common/lit

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