From c2545b921523538e8237ff6a2591f6cb75ee79f1 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Sat, 7 Oct 2017 12:56:53 +0200
Subject: [PATCH] Add check for HB_EXTERNs

https://github.com/behdad/harfbuzz/pull/555
---
 src/Makefile.am      |  1 +
 src/check-externs.sh | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100755 src/check-externs.sh

diff --git a/src/Makefile.am b/src/Makefile.am
index 0c077d990..ea550d266 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -300,6 +300,7 @@ check: harfbuzz.def # For check-defs.sh
 dist_check_SCRIPTS = \
 	check-c-linkage-decls.sh \
 	check-defs.sh \
+	check-externs.sh \
 	check-header-guards.sh \
 	check-includes.sh \
 	check-libstdc++.sh \
diff --git a/src/check-externs.sh b/src/check-externs.sh
new file mode 100755
index 000000000..63cc7d5bb
--- /dev/null
+++ b/src/check-externs.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+LC_ALL=C
+export LC_ALL
+
+test -z "$srcdir" && srcdir=.
+stat=0
+
+test "x$HBHEADERS" = x && HBHEADERS=`cd "$srcdir"; find . -maxdepth 1 -name 'hb*.h'`
+test "x$EGREP" = x && EGREP='grep -E'
+
+
+echo 'Checking that all public symbols are exported with HB_EXTERN'
+
+for x in $HBHEADERS; do
+	test -f "$srcdir/$x" && x="$srcdir/$x"
+	$EGREP -B1 '^hb_' "$x" | $EGREP -E -v '^(--|hb_|HB_EXTERN )' -A1
+done |
+grep . >&2 && stat=1
+
+exit $stat