[PATCH v4] devtools: parallelize ABI check

[Thomas Monjalon <thomas@monjalon.net>]

Generation and comparison of ABI dumps are done on multiple cores
thanks to xargs -P0.
It can accelerate this long step by 5 in my tests.

xargs reports a global error if one of the process has an error.

Running a shell function with xargs requires to export it.
POSIX shell does not support function export except using an "eval trick".
Required variables are also exported.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Tested-by: Ferruh Yigit <ferruh.yigit@amd.com>
---
v2:
	- find dump2 inside the function
	- force bash because of export -f
v3:
	- revert to POSIX sh
	- use POSIX eval instead of export -f (issues on Ubuntu)
v4:
	- export all required variables
	- remove useless stdout echo calls
---
 devtools/check-abi.sh | 23 +++++++++++++----------
 devtools/gen-abi.sh   |  5 +++--
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/devtools/check-abi.sh b/devtools/check-abi.sh
index c583eae2fd..31eceb42e6 100755
--- a/devtools/check-abi.sh
+++ b/devtools/check-abi.sh
@@ -34,20 +34,18 @@ else
 	ABIDIFF_OPTIONS="$ABIDIFF_OPTIONS --headers-dir2 $incdir2"
 fi
 
-error=
-for dump in $(find $refdir -name "*.dump"); do
+export newdir ABIDIFF_OPTIONS
+export diff_func='run_diff() {
+	dump=$1
 	name=$(basename $dump)
 	dump2=$(find $newdir -name $name)
 	if [ -z "$dump2" ] || [ ! -e "$dump2" ]; then
 		echo "Error: cannot find $name in $newdir" >&2
-		error=1
-		continue
-	fi
+		return 1
+	fi;
 	abidiff $ABIDIFF_OPTIONS $dump $dump2 || {
 		abiret=$?
-		echo "Error: ABI issue reported for 'abidiff $ABIDIFF_OPTIONS $dump $dump2'" >&2
-		error=1
-		echo
+		echo "Error: ABI issue reported for abidiff $ABIDIFF_OPTIONS $dump $dump2" >&2
 		if [ $(($abiret & 3)) -ne 0 ]; then
 			echo "ABIDIFF_ERROR|ABIDIFF_USAGE_ERROR, this could be a script or environment issue." >&2
 		fi
@@ -57,8 +55,13 @@ for dump in $(find $refdir -name "*.dump"); do
 		if [ $(($abiret & 8)) -ne 0 ]; then
 			echo "ABIDIFF_ABI_INCOMPATIBLE_CHANGE, this change breaks the ABI." >&2
 		fi
-		echo
+		return 1
 	}
-done
+}'
+
+error=
+find $refdir -name "*.dump" |
+xargs -n1 -P0 sh -c 'eval "$diff_func"; run_diff $0' ||
+error=1
 
 [ -z "$error" ] || [ -n "$warnonly" ]
diff --git a/devtools/gen-abi.sh b/devtools/gen-abi.sh
index f15a3b9aaf..61f7510ea1 100755
--- a/devtools/gen-abi.sh
+++ b/devtools/gen-abi.sh
@@ -22,5 +22,6 @@ for f in $(find $installdir -name "*.so.*"); do
 	fi
 
 	libname=$(basename $f)
-	abidw --out-file $dumpdir/${libname%.so*}.dump $f
-done
+	echo $dumpdir/${libname%.so*}.dump $f
+done |
+xargs -n2 -P0 abidw --out-file
-- 
2.39.0