Embedded Resource

Talks

Embedded Linux Size Reduction Techniques

講者

Michael Opdenacker

Conf

Embedded Linux Conference 2017

Slides

http://events.linuxfoundation.org/sites/events/files/slides/opdenacker-embedded-linux-size-reduction-techniques_0.pdf

Video

https://www.youtube.com/watch?v=ynNLlzOElOU

  • 編譯器優化
    • Clang & GCC: -Os

    • Clang: -Oz ,比 -Os 更進一步

  • Linker
    • Clang & GCC: -flto

  • ARM 平台(ARM mode vs Thumb mode)
    • -marm

    • -mthumb

  • Linux kernel
    • make tinyconfig

  • BusyBox vs Toybox
    • 相較之下 Toybox 在大小上比較有優勢,而且可以有極小的 rootfs

    • 相較之下 BusyBox 在彈性上比較有優勢,而功能也比較多

  • glibc vs uclibc vs musl

  • super strip (sstrip)

實測:

$ cat hello.c
#include <stdio.h>

int main() {
    printf("Hello World\n");
}
$ clang hello.c -o hello

$ ll hello
-rwxr-xr-x 1 user user 8312 Mar  3 14:58 hello

$ strip hello
$ ll hello
-rwxr-xr-x 1 user user 6184 Mar  3 14:58 hello

$ sstrip hello
$ ll hello
-rwxr-xr-x 1 user user 4144 Mar  3 14:58 hello