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CMake: Add UNDEFINED_BEHAVIOR_IS_FATAL configure option

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This is mainly intended for use on CI, as UBSan instrumentation results
in a serious load and execution time penalty there. See the previous
commit for more details.

With this enabled, the size of LibWeb, built for x86-64 with Clang 17 as
of 0b91d36a is reduced as follows:

      FILE SIZE        VM SIZE
   --------------  --------------
     +18% +2.99Mi  [ = ]       0    .debug_info
     +14%  +758Ki  [ = ]       0    .debug_addr
    +2.6% +7.92Ki  [ = ]       0    .debug_abbrev
    +129% +2.66Ki  [ = ]       0    [Unmapped]
    -0.2%    -208  -0.2%    -208    .plt
    -0.2%    -312  -0.2%    -312    .rela.plt
    -0.1%    -336  -0.1%    -336    .dynsym
    -0.0%    -647  -0.0%    -513    [8 Others]
    -0.1% -1.14Ki  -0.1% -1.14Ki    .dynstr
   -20.1% -53.5Ki -20.1% -53.5Ki    .eh_frame_hdr
    -7.2% -56.8Ki  [ = ]       0    .debug_str_offsets
    -7.1%  -156Ki  [ = ]       0    .debug_str
   -15.0%  -160Ki  [ = ]       0    .symtab
   -63.6%  -245Ki -63.6%  -245Ki    .relr.dyn
   -25.4%  -357Ki -25.4%  -357Ki    .eh_frame
   -27.7% -1.09Mi  [ = ]       0    .strtab
   -59.3% -10.0Mi  [ = ]       0    .debug_rnglists
   -41.3% -11.0Mi  [ = ]       0    .debug_line
   -70.0% -12.0Mi -70.0% -12.0Mi    .rodata
   -65.2% -15.1Mi -65.2% -15.1Mi    .data
   -53.0% -15.7Mi -53.0% -15.7Mi    .text
   -41.7% -62.1Mi -57.7% -43.4Mi    TOTAL
This commit is contained in:
Daniel Bertalan 2023-08-12 15:39:22 +02:00 • committed by Andreas Kling
parent f0973db6dd
commit 44365074fe
5 changed files with 20 additions and 8 deletions
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3
Documentation/AdvancedBuildInstructions.md
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@ -46,7 +46,8 @@ There are some optional features that can be enabled during compilation that are
- `ENABLE_KERNEL_COVERAGE_COLLECTION`: enables the KCOV API and kernel coverage collection instrumentation. Only useful for coverage guided kernel fuzzing.
- `ENABLE_USERSPACE_COVERAGE_COLLECTION`: enables coverage collection instrumentation for userspace. Currently only works with a Clang build.
- `ENABLE_MEMORY_SANITIZER`: enables runtime checks for uninitialized memory accesses in Lagom test cases.
- `ENABLE_UNDEFINED_SANITIZER`: builds in runtime checks for [undefined behavior](https://en.wikipedia.org/wiki/Undefined_behavior) (like null pointer dereferences and signed integer overflows) in Lagom test cases.
- `ENABLE_UNDEFINED_SANITIZER`: builds in runtime checks for [undefined behavior](https://en.wikipedia.org/wiki/Undefined_behavior) (like null pointer dereferences and signed integer overflows) in Lagom and the SerenityOS userland.
- `UNDEFINED_BEHAVIOR_IS_FATAL`: makes all undefined behavior sanitizer errors non-recoverable. This option reduces the performance overhead of `ENABLE_UNDEFINED_SANITIZER`.
- `ENABLE_COMPILER_EXPLORER_BUILD`: Skip building non-library entities in Lagom (this only applies to Lagom).
- `ENABLE_FUZZERS`: builds [fuzzers](../Meta/Lagom/ReadMe.md#fuzzing) for various parts of the system.
- `ENABLE_FUZZERS_LIBFUZZER`: builds Clang libFuzzer-based [fuzzers](../Meta/Lagom/ReadMe.md#fuzzing) for various parts of the system.