From 5448f328ff63a6ca4a64519c2f1dfc63a33df4b7 Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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Date: Thu, 10 Sep 2020 11:37:33 +0200
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Subject: [PATCH] Pass -fno-builtin to fix build with gcc 10
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gcc 10, if it recognizes some hand-written code that looks like
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memcpy, will generate a call to memcpy().
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For example:
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while (dst < &_end_data) {
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*dst++ = *src++;
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}
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gets recognized as such. However, in the context of bare-metal code,
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having a call to memcpy() in the C library doesn't work. So we fix
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that by disabling builtins.
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Fixes:
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/home/thomas/projets/buildroot/output/host/opt/ext-toolchain/bin/../arm-buildroot-uclinux-uclibcgnueabi/bin/ld.real: stm32f429i-disco.o: in function `reset':
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stm32f429i-disco.c:(.text.reset+0x1a): undefined reference to `memcpy'
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/home/thomas/projets/buildroot/output/host/opt/ext-toolchain/bin/../arm-buildroot-uclinux-uclibcgnueabi/bin/ld.real: stm32f429i-disco.c:(.text.reset+0x34): undefined reference to `memset'
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make[1]: *** [Makefile:26: stm32f429i-disco] Error 1
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Upstream: https://github.com/mcoquelin-stm32/afboot-stm32/pull/9
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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---
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Makefile | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/Makefile b/Makefile
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index f699176..1e8557d 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -13,6 +13,7 @@ DTB_ADDR?=0x08004000
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CFLAGS := -mthumb -mcpu=cortex-m4
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CFLAGS += -ffunction-sections -fdata-sections
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CFLAGS += -Os -std=gnu99 -Wall
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+CFLAGS += -fno-builtin
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LINKERFLAGS := -nostartfiles --gc-sections
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obj-y += gpio.o mpu.o qspi.o start_kernel.o
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--
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2.26.2
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