From 6247aaa57cb7d077086c48c7fa40069d924e53bf Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Thu, 10 Aug 2017 21:53:19 -0400
Subject: [PATCH] Fix libqpdf.map and prevent future breakage

The build now checks to make sure libqpdf.map has the right library
version number in it.
---
 libqpdf.map      |  2 +-
 libqpdf/build.mk | 22 ++++++++++++++++++++--
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/libqpdf.map b/libqpdf.map
index ab23bd9a..548dcb4d 100644
--- a/libqpdf.map
+++ b/libqpdf.map
@@ -1,4 +1,4 @@
-LIBQPDF_10 {
+LIBQPDF_17 {
   global:
     *;
 };
diff --git a/libqpdf/build.mk b/libqpdf/build.mk
index 001d36c8..e8561128 100644
--- a/libqpdf/build.mk
+++ b/libqpdf/build.mk
@@ -94,5 +94,23 @@ $(COBJS_libqpdf): libqpdf/$(OUTPUT_DIR)/%.$(LOBJ): libqpdf/%.c
 #
 # * Otherwise, increment REVISION
 
-$(TARGETS_libqpdf): $(OBJS_libqpdf)
-	$(call makelib,$(OBJS_libqpdf),$@,$(LDFLAGS),$(LIBS),17,0,0)
+CURRENT := 17
+REVISION := 0
+AGE := 0
+$(TARGETS_libqpdf): $(OBJS_libqpdf) libqpdf/$(OUTPUT_DIR)/checkmap_libqpdf-$(CURRENT).stamp
+	$(call makelib,$(OBJS_libqpdf),$@,$(LDFLAGS),$(LIBS),$(CURRENT),$(REVISION),$(AGE))
+
+libqpdf/$(OUTPUT_DIR)/checkmap_libqpdf-$(CURRENT).stamp: libqpdf.map
+	@if [ $$(head -1 libqpdf.map | awk '{print $$1}') = LIBQPDF_$(CURRENT) ]; then \
+		touch $@; \
+	else \
+		echo ''; \
+		echo '****'; \
+		echo libqpdf.map is out of date; \
+		echo first line should contain LIBQPDF_$(CURRENT); \
+		echo '****'; \
+		echo ''; \
+		rm -f $@; \
+		false; \
+	fi
+