From 4e8d8d2345ea121b1e9d228603ece1142c9bb82f Mon Sep 17 00:00:00 2001
From: Ben Wolsieffer <ben.wolsieffer@hefring.com>
Date: Sun, 29 Sep 2024 22:14:56 +0200
Subject: [PATCH] linux: pass -mno-fdpic if FDPIC is enabled

If the FDPIC ABI is enabled by default in the toolchain, it must be
explicitly disabled when building the kernel.

Signed-off-by: Ben Wolsieffer <Ben.Wolsieffer@hefring.com>
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 linux/linux.mk | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/linux/linux.mk b/linux/linux.mk
index 0a213d17b5..126e92e84c 100644
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -163,6 +163,7 @@ endif
 LINUX_MAKE_FLAGS = \
 	HOSTCC="$(HOSTCC) $(subst -I/,-isystem /,$(subst -I /,-isystem /,$(HOST_CFLAGS))) $(HOST_LDFLAGS)" \
 	ARCH=$(KERNEL_ARCH) \
+	KCFLAGS="$(LINUX_CFLAGS)" \
 	INSTALL_MOD_PATH=$(TARGET_DIR) \
 	CROSS_COMPILE="$(TARGET_CROSS)" \
 	WERROR=0 \
@@ -184,7 +185,12 @@ endif
 # sanitize the arguments passed from user space in registers.
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82435
 ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
-LINUX_MAKE_ENV += KCFLAGS=-Wno-attribute-alias
+LINUX_CFLAGS += -Wno-attribute-alias
+endif
+
+# Disable FDPIC if enabled by default in toolchain
+ifeq ($(BR2_BINFMT_FDPIC),y)
+LINUX_CFLAGS += -mno-fdpic
 endif
 
 ifeq ($(BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT),y)