check-function-names.sh

 1#!/bin/sh
 2# SPDX-License-Identifier: GPL-2.0
 3#
 4# Certain function names are disallowed due to section name ambiguities
 5# introduced by -ffunction-sections.
 6#
 7# See the comment above TEXT_MAIN in include/asm-generic/vmlinux.lds.h.
 8
 9objfile="$1"
10
11if [ ! -f "$objfile" ]; then
12	echo "usage: $0 <file.o>" >&2
13	exit 1
14fi
15
16bad_symbols=$(${NM:-nm} "$objfile" | awk '$2 ~ /^[TtWw]$/ {print $3}' | grep -E '^(startup|exit|split|unlikely|hot|unknown)(\.|$)')
17
18if [ -n "$bad_symbols" ]; then
19	echo "$bad_symbols" | while read -r sym; do
20		echo "$objfile: error: $sym() function name creates ambiguity with -ffunction-sections" >&2
21	done
22	exit 1
23fi
24
25exit 0