[PATCH 1/3] check-uapi: link into shared objects

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.de>

While testing ABI changes across all architectures, I found that abidiff
sometimes produces nonsensical output. Further debugging identified
missing or broken libelf support for architecture specific relocations
in ET_REL binaries as the source of the problem[1].

Change the script to no longer produce a relocatable object file but
instead create a shared library for each header. This makes abidiff
work for all of the architectures in upstream linux kernels.

Link: https://sourceware.org/bugzilla/show_bug.cgi?id=33869
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 scripts/check-uapi.sh | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/check-uapi.sh b/scripts/check-uapi.sh
index 955581735cb3..9fa45cbdecc2 100755
--- a/scripts/check-uapi.sh
+++ b/scripts/check-uapi.sh
@@ -178,8 +178,11 @@ do_compile() {
 	local -r inc_dir="$1"
 	local -r header="$2"
 	local -r out="$3"
-	printf "int main(void) { return 0; }\n" | \
-		"$CC" -c \
+	printf "int f(void) { return 0; }\n" | \
+		"$CC" \
+		  -shared \
+		  -nostdlib \
+		  -fPIC \
 		  -o "$out" \
 		  -x c \
 		  -O0 \
-- 
2.39.5