diff -Nru qr-code-generator-1.7.0/debian/changelog qr-code-generator-1.7.0/debian/changelog
--- qr-code-generator-1.7.0/debian/changelog	2022-01-02 10:52:31.000000000 +0000
+++ qr-code-generator-1.7.0/debian/changelog	2022-01-24 14:44:43.000000000 +0000
@@ -1,3 +1,9 @@
+qr-code-generator (1.7.0-2) unstable; urgency=medium
+
+  * Fix ABI interface
+
+ -- Yangfl <mmyangfl@gmail.com>  Mon, 24 Jan 2022 22:44:43 +0800
+
 qr-code-generator (1.7.0-1) unstable; urgency=medium
 
   * New upstream release
diff -Nru qr-code-generator-1.7.0/debian/patches/0001-Make-C-shared-lib.patch qr-code-generator-1.7.0/debian/patches/0001-Make-C-shared-lib.patch
--- qr-code-generator-1.7.0/debian/patches/0001-Make-C-shared-lib.patch	2022-01-02 10:52:31.000000000 +0000
+++ qr-code-generator-1.7.0/debian/patches/0001-Make-C-shared-lib.patch	2022-01-24 14:44:43.000000000 +0000
@@ -1,4 +1,4 @@
-From 1abe33937f1cd561bf58a1f4475f8092a35566b8 Mon Sep 17 00:00:00 2001
+From ccfa51dc9cdf346bfb48fc8c97aceadd7e85a454 Mon Sep 17 00:00:00 2001
 From: yangfl <yangfl@users.noreply.github.com>
 Date: Mon, 22 Feb 2021 00:13:09 +0800
 Subject: [PATCH 1/2] Make C shared lib
diff -Nru qr-code-generator-1.7.0/debian/patches/0002-Make-C-shared-lib.patch qr-code-generator-1.7.0/debian/patches/0002-Make-C-shared-lib.patch
--- qr-code-generator-1.7.0/debian/patches/0002-Make-C-shared-lib.patch	2022-01-02 10:52:31.000000000 +0000
+++ qr-code-generator-1.7.0/debian/patches/0002-Make-C-shared-lib.patch	2022-01-24 14:44:43.000000000 +0000
@@ -1,15 +1,15 @@
-From b093e77fea0dcf1c96ca48df02ab4cb92db90824 Mon Sep 17 00:00:00 2001
+From 4a4bc0e4acf3c7394723b85c4345de45cf4ca430 Mon Sep 17 00:00:00 2001
 From: yangfl <yangfl@users.noreply.github.com>
 Date: Mon, 22 Feb 2021 00:24:45 +0800
 Subject: [PATCH 2/2] Make C++ shared lib
 
 ---
- cpp/Makefile           | 53 ++++++++++++++++++++++++++++++++-----
- cpp/compat.cpp         | 59 ++++++++++++++++++++++++++++++++++++++++++
- cpp/qrcodegen.cpp      |  2 ++
- cpp/qrcodegen.hpp      | 18 +++++++++++++
- cpp/qrcodegencpp.pc.in | 10 +++++++
- 5 files changed, 136 insertions(+), 6 deletions(-)
+ cpp/Makefile           | 53 ++++++++++++++++++++++++++++++++++-----
+ cpp/compat.cpp         | 57 ++++++++++++++++++++++++++++++++++++++++++
+ cpp/qrcodegen.cpp      |  4 ++-
+ cpp/qrcodegen.hpp      | 26 ++++++++++++++++++-
+ cpp/qrcodegencpp.pc.in | 10 ++++++++
+ 5 files changed, 142 insertions(+), 8 deletions(-)
  create mode 100644 cpp/compat.cpp
  create mode 100644 cpp/qrcodegencpp.pc.in
 
@@ -96,10 +96,10 @@
  .deps/timestamp:
 diff --git a/cpp/compat.cpp b/cpp/compat.cpp
 new file mode 100644
-index 0000000..19144ca
+index 0000000..b7a49e8
 --- /dev/null
 +++ b/cpp/compat.cpp
-@@ -0,0 +1,59 @@
+@@ -0,0 +1,57 @@
 +#define QRCODEGEN_COMPAT
 +
 +#include <climits>
@@ -112,7 +112,6 @@
 +namespace qrcodegen {
 +
 +QrSegment::QrSegment(Mode md, int numCh, const std::vector<bool> &dt) :
-+		mode(&compatMode),
 +		compatMode(md),
 +		numChars(numCh),
 +		data(dt) {
@@ -122,7 +121,6 @@
 +
 +
 +QrSegment::QrSegment(Mode md, int numCh, std::vector<bool> &&dt) :
-+		mode(&compatMode),
 +		compatMode(md),
 +		numChars(numCh),
 +		data(std::move(dt)) {
@@ -160,38 +158,55 @@
 +
 +}
 diff --git a/cpp/qrcodegen.cpp b/cpp/qrcodegen.cpp
-index e52dd50..bcd737c 100644
+index e52dd50..12348d2 100644
 --- a/cpp/qrcodegen.cpp
 +++ b/cpp/qrcodegen.cpp
-@@ -158,6 +158,7 @@ QrSegment QrSegment::makeEci(long assignVal) {
+@@ -157,6 +157,7 @@ QrSegment QrSegment::makeEci(long assignVal) {
+ 
  
  QrSegment::QrSegment(const Mode &md, int numCh, const std::vector<bool> &dt) :
++		compatModeBits(-1),
  		mode(&md),
-+		compatMode(md),
  		numChars(numCh),
  		data(dt) {
- 	if (numCh < 0)
-@@ -167,6 +168,7 @@ QrSegment::QrSegment(const Mode &md, int numCh, const std::vector<bool> &dt) :
+@@ -166,6 +167,7 @@ QrSegment::QrSegment(const Mode &md, int numCh, const std::vector<bool> &dt) :
+ 
  
  QrSegment::QrSegment(const Mode &md, int numCh, std::vector<bool> &&dt) :
++		compatModeBits(-1),
  		mode(&md),
-+		compatMode(md),
  		numChars(numCh),
  		data(std::move(dt)) {
- 	if (numCh < 0)
+@@ -211,7 +213,7 @@ bool QrSegment::isAlphanumeric(const char *text) {
+ 
+ 
+ const QrSegment::Mode &QrSegment::getMode() const {
+-	return *mode;
++	return compatModeBits < 0 ? *mode : compatMode;
+ }
+ 
+ 
 diff --git a/cpp/qrcodegen.hpp b/cpp/qrcodegen.hpp
-index 9448982..1592028 100644
+index 9448982..1a5e4f7 100644
 --- a/cpp/qrcodegen.hpp
 +++ b/cpp/qrcodegen.hpp
-@@ -152,6 +152,7 @@ class QrSegment final {
+@@ -151,7 +151,14 @@ class QrSegment final {
+ 	/*---- Instance fields ----*/
  	
  	/* The mode indicator of this segment. Accessed through getMode(). */
- 	private: const Mode *mode;
-+	private: Mode compatMode;
+-	private: const Mode *mode;
++	private: union {
++		struct {
++			// < 0, mode is valid
++			int compatModeBits;
++			const Mode *mode;
++		};
++		Mode compatMode;
++	};
  	
  	/* The length of this segment's unencoded data. Measured in characters for
  	 * numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode.
-@@ -170,7 +171,11 @@ class QrSegment final {
+@@ -170,7 +177,11 @@ class QrSegment final {
  	 * The character count (numCh) must agree with the mode and the bit buffer length,
  	 * but the constraint isn't checked. The given bit buffer is copied and stored.
  	 */
@@ -203,7 +218,7 @@
  	
  	
  	/* 
-@@ -178,7 +183,11 @@ class QrSegment final {
+@@ -178,7 +189,11 @@ class QrSegment final {
  	 * The character count (numCh) must agree with the mode and the bit buffer length,
  	 * but the constraint isn't checked. The given bit buffer is moved and stored.
  	 */
@@ -215,7 +230,7 @@
  	
  	
  	/*---- Methods ----*/
-@@ -369,6 +378,15 @@ class QrCode final {
+@@ -369,6 +384,15 @@ class QrCode final {
  	public: bool getModule(int x, int y) const;