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Kernel: Build with -O2 by default

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We used to build with -Os in order to fit within a certain size, but
there isn't really a good reason for that kind of restriction.

Switching to -O2 yields a significant improvement in throughput,
for example `test-js` is roughly 20% faster on my machine. :^)
This commit is contained in:
Andreas Kling 2021-12-14 09:42:26 +01:00
parent 39e3c68e94
commit 13680ae038
Notes: sideshowbarker 2024-07-17 22:42:13 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/13680ae0380
2 changed files with 2 additions and 2 deletions
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2
Documentation/AdvancedBuildInstructions.md
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@ -45,7 +45,7 @@ There are some optional features that can be enabled during compilation that are
- `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_FUZZER_SANITIZER`: builds [fuzzers](https://en.wikipedia.org/wiki/Fuzzing) for various parts of the system.
- `ENABLE_EXTRA_KERNEL_DEBUG_SYMBOLS`: sets -Og and -ggdb3 compile options for building the Kernel. Allows for easier debugging of Kernel code. By default, the Kernel is built with -Os instead.
- `ENABLE_EXTRA_KERNEL_DEBUG_SYMBOLS`: sets -Og and -ggdb3 compile options for building the Kernel. Allows for easier debugging of Kernel code. By default, the Kernel is built with -O2 instead.
- `ENABLE_ALL_THE_DEBUG_MACROS`: used for checking whether debug code compiles on CI. This should not be set normally, as it clutters the console output and makes the system run very slowly. Instead, enable only the needed debug macros, as described below.
- `ENABLE_ALL_DEBUG_FACILITIES`: used for checking whether debug code compiles on CI. Enables both `ENABLE_ALL_THE_DEBUG_MACROS` and `ENABLE_EXTRA_KERNEL_DEBUG_SYMBOLS`.
- `ENABLE_COMPILETIME_FORMAT_CHECK`: checks for the validity of `std::format`-style format string during compilation. Enabled by default.

2
Kernel/CMakeLists.txt
View file

@ -2,7 +2,7 @@ if (ENABLE_EXTRA_KERNEL_DEBUG_SYMBOLS)
add_compile_options(-Og)
add_compile_options(-ggdb3)
else()
add_compile_options(-Os)
add_compile_options(-O2)
endif()
if ("${SERENITY_ARCH}" STREQUAL "aarch64")