CONFIG_CC_OPTIMIZE_FOR_SIZE: Optimize for size (-Os)

General informations

The Linux kernel configuration item CONFIG_CC_OPTIMIZE_FOR_SIZE has multiple definitions:

Optimize for size (-Os) found in init/Kconfig

The configuration item CONFIG_CC_OPTIMIZE_FOR_SIZE:

• prompt: Optimize for size (-Os)
• type: bool
• depends on: (none)
• defined in init/Kconfig
• found in Linux kernels: 5.4–5.19, 6.0–6.17, 6.18-rc+HEAD

Help text

Choosing this option will pass "-Os" to your compiler resulting in a smaller kernel.

Optimize for size found in init/Kconfig

The configuration item CONFIG_CC_OPTIMIZE_FOR_SIZE:

• prompt: Optimize for size
• type: bool
• depends on: (none)
• defined in init/Kconfig
• found in Linux kernels: 2.6.1–2.6.14, 2.6.26–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.3

Help text

Enabling this option will pass "-Os" instead of "-O2" to your compiler resulting in a smaller kernel.

If unsure, say N.

Optimize for size (Look out for broken compilers!) found in init/Kconfig

The configuration item CONFIG_CC_OPTIMIZE_FOR_SIZE:

• prompt: Optimize for size (Look out for broken compilers!)
• type: bool
• depends on: CONFIG_ARM || CONFIG_H8300 || CONFIG_SUPERH || CONFIG_EXPERIMENTAL
• defined in init/Kconfig
• found in Linux kernels: 2.6.15–2.6.25

Help text

Enabling this option will pass "-Os" instead of "-O2" to gcc resulting in a smaller kernel.

WARNING: some versions of gcc may generate incorrect code with this option. If problems are observed, a gcc upgrade may be needed.

If unsure, say N.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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