Add exports file and abi checker for tevent

This is a first attempt at exporting symbols only for public functions
We also provide a rudimentary ABI checker that tries to check that
function signatures are not changed by mistake.
Given our use of macros this is not an API checker.
It's all based on tevent.h contents and the gcc -aux-info option

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/tevent/abi_checks.sh b/lib/tevent/abi_checks.sh
new file mode 100755
index 0000000000..83082ad401
--- /dev/null
+++ b/lib/tevent/abi_checks.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+make clean
+
+mkdir abi
+ABI_CHECKS="-aux-info abi/\$@.X"
+make ABI_CHECK="$ABI_CHECKS"
+
+for i in abi/*.X; do cat $i | grep 'tevent\.h'; done | sort | uniq | awk -F "extern " '{ print $2 }' > abi/signatures
+
+cat > abi/exports << EOF
+{
+    global:
+EOF
+cat abi/signatures | awk -F '(' '{ print $1 }' | awk -F ' ' '{ print "           "$NF";" }' | tr -d '*' | sort >> abi/exports
+cat >> abi/exports << EOF
+
+    local: *;
+};
+EOF
+
+rm -fr abi/*.X
+
+diff -u tevent.signatures abi/signatures
+if [ "$?" != "0" ]; then
+    echo "WARNING: Possible ABI Change!!"
+fi
+
+diff -u tevent.exports abi/exports
+if [ "$?" != "0" ]; then
+    echo "WARNING: Export file may be outdated!!"
+fi