Home

Using Clang and the LLVM toolchain system wide in Gentoo is experimental. It's been possible to use the toolchain for many years, however there isn't a lot of in depth information for it. The Gentoo Wiki itself is great for getting started and should be read before trying to tackle the enormous hurdle of using Clang system wide, especially when serving an extra side of rice. Unfortunately, there's a lot of stuff outside the scope of the Gentoo Wiki to cover, such as optimization flags unique to Clang.

---

Gentoo defaults:

stat /usr/bin/ninja-reference
Size: 283736 Blocks: 560 IO Block: 4096 regular file

-fdata-sections:

stat /usr/bin/ninja-reference
Size: 283736 Blocks: 560 IO Block: 4096 regular file

-ffunction-sections:

stat /usr/bin/ninja-reference
Size: 283736 Blocks: 560 IO Block: 4096 regular file

-Wl,--gc-sections: decrease of 1.00%

stat /usr/bin/ninja-reference
Size: 283344 Blocks: 560 IO Block: 4096 regular file

-Wl,--icf=all: decrease of 1.08%

stat /usr/bin/ninja-reference
Size: 263176 Blocks: 520 IO Block: 4096 regular file

-Wl,-O2: decrease of 1.00%

stat /usr/bin/ninja-reference
Size: 283464 Blocks: 560 IO Block: 4096 regular file

-fdata-sections -Wl,--gc-sections: decrease of 1.00%

stat /usr/bin/ninja-reference
Size: 283240 Blocks: 560 IO Block: 4096 regular file

-ffunction-sections -Wl,--gc-sections: decrease of 1.04%

stat /usr/bin/ninja-reference
Size: 273920 Blocks: 536 IO Block: 4096 regular file

-fdata-sections -ffunction-sections -Wl,--gc-sections: decrease of 1.04%

stat /usr/bin/ninja-reference
Size: 273768 Blocks: 536 IO Block: 4096 regular file

-fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,--icf=all: decrease of 1.12%

stat /usr/bin/ninja-reference
Size: 253128 Blocks: 496 IO Block: 4096 regular file

-fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,--icf=all -Wl,-O2: decrease of 1.12%

stat /usr/bin/ninja-reference
Size: 252952 Blocks: 496 IO Block: 4096 regular file