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gcc-arm-none-eabi: build common embedded archs instead of everything (~6x faster) #20

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Merged
twitchyliquid64 merged 1 commit into from
Mar 27, 2026
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gcc-arm-none-eabi: build common embedded archs instead of everything (~6x faster) #20

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16 changes: 16 additions & 0 deletions packages/gcc-arm-none-eabi/build.sh
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Expand Up @@ -18,6 +18,22 @@ export CXXFLAGS_FOR_TARGET="-g -O2 -ffunction-sections -fdata-sections"
tar -xof "gcc-${MINIMAL_ARG_GCC_VERSION}.tar.xz"
tar -xof "newlib-${MINIMAL_ARG_NEWLIB_VERSION}.tar.gz"

# Patch t-rmprofile to only build multilib variants needed for common hobbyist MCUs
RMPROFILE="gcc-${MINIMAL_ARG_GCC_VERSION}/gcc/config/arm/t-rmprofile"
sed -i '/^MULTILIB_REQUIRED/d; /^MULTILIB_REUSE/d' "$RMPROFILE"
cat >> "$RMPROFILE" <<'PATCH'
# Cortex-M0/M0+ (RP2040, ATSAMD21, STM32F0)
MULTILIB_REQUIRED += mthumb/march=armv6s-m/mfloat-abi=soft
# Cortex-M3 (STM32F1 / Blue Pill)
MULTILIB_REQUIRED += mthumb/march=armv7-m/mfloat-abi=soft
# Cortex-M4F (ATSAMD51, STM32F4 / Black Pill, nRF52840)
MULTILIB_REQUIRED += mthumb/march=armv7e-m/mfpu=fpv4-sp-d16/mfloat-abi=hard
# Cortex-M7 (STM32H7/F7, Teensy 4.x)
MULTILIB_REQUIRED += mthumb/march=armv7e-m/mfpu=fpv5-d16/mfloat-abi=hard
# Cortex-M33 (RP2350 / Pico 2, nRF5340)
MULTILIB_REQUIRED += mthumb/march=armv8-m.main/mfpu=fpv5-sp-d16/mfloat-abi=hard
PATCH

# Symlink newlib into GCC source tree for unified in-tree build
ln -s "../newlib-${MINIMAL_ARG_NEWLIB_VERSION}/newlib" "gcc-${MINIMAL_ARG_GCC_VERSION}/newlib"
ln -s "../newlib-${MINIMAL_ARG_NEWLIB_VERSION}/libgloss" "gcc-${MINIMAL_ARG_GCC_VERSION}/libgloss"
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