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