ARM Build

• alpine 包含 gcc-arm-none-eabi - 适用于 arm 裸机
• debian gcc-arm-linux-gnueabi
  • 最早版本 6
• EABI - Embedded ABI
  • family of ABIs and one of the "subABIs" is GNU EABI
• EABI4
  • arm v5t linux 2.4.17
  • gcc 3 - 很难找
  • -mabi=aapcs-linux -mfloat-abi=soft -meabi=4
  • arm-unknown-linux-gnueabi
• EABI5 - 现在默认 - hf
  • armv6-alpine-linux-muslgnueabihf
• ArmEabiPort
• https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/
• gcc
  • ARM-Options
• -mabi=aapcs-linux -marm -mthumb-interwork

# EABI version
gcc -dumpmachine
readelf -h libsqlite3.so | grep Flags

echo 'int main(){}' > test.c
gcc -o test test.c
# 默认
file test

# 查看是否 VFP
readelf -A test | grep VFP

gcc -print-multi-lib

# 预设架构
gcc -Q --help=target

-mabi

ABI Variables

Kernel	ABI	CLFS_ABI=Value	Note
CONFIG_AEABI	aapcs-linux	aapcs-linux	EABI. Linux 32 bit (int) enums
-	apcs-gnu	apcs-gnu	OABI
CONFIG_THUMB2_KERNEL	atpcs	atpcs	Thumb ABI
-	aapcs	aapcs	EABI w/ variable size enums
CONFIG_IWMMXT	iwmmxt	iwmmxt	Intel XScale MMX

sorry, unimplemented: -mfloat-abi=hard and VFP

• -mfloat-abi=soft

gcc -march=?

Source object /tmp/out.o has EABI version 0, but target test has EABI version 5

混合了 OABI 和 EABI

cannot find libgcc_s.so.1

• -mabi=aapcs-linux

apk add libgcc