From f4c4811a301237d822d1e7f16fece63abd0c232cd9d235a86942a16df1bdd679 Mon Sep 17 00:00:00 2001
From: Jan Engelhardt <jengelh@inai.de>
Date: Wed, 9 Aug 2023 17:56:35 +0000
Subject: [PATCH] Accepting request 1103183 from LibreOffice:Factory

Clean up and fix build on SLE15SP5

OBS-URL: https://build.opensuse.org/request/show/1103183
OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/zxing-cpp?expand=0&rev=31
---
 cmake.patch       | 35 +++++++++++++++++++++++++++++++++++
 zxing-cpp.changes |  9 +++++++++
 zxing-cpp.spec    | 20 ++++++++++++++++----
 3 files changed, 60 insertions(+), 4 deletions(-)
 create mode 100644 cmake.patch

diff --git a/cmake.patch b/cmake.patch
new file mode 100644
index 0000000..52b8abc
--- /dev/null
+++ b/cmake.patch
@@ -0,0 +1,35 @@
+--- zxing-cpp-2.0.0/CMakeLists.txt	2023-08-08 13:26:51.918694430 +0200
++++ zxing-cpp-2.0.0/CMakeLists.txt	2023-08-08 13:38:00.669700216 +0200
+@@ -1,4 +1,4 @@
+-cmake_minimum_required (VERSION 3.14)
++cmake_minimum_required (VERSION 3.5)
+ 
+ project(ZXing)
+ 
+@@ -42,8 +42,7 @@
+     set (CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+ endif()
+ 
+-set (CMAKE_CXX_STANDARD 17)
+-set (CMAKE_CXX_EXTENSIONS OFF)
++set (CMAKE_CXX_EXTENSIONS ON)
+ 
+ if (NOT (BUILD_READERS OR BUILD_WRITERS))
+     message(FATAL_ERROR "At least one of BUILD_READERS/BUILD_WRITERS must be enabled.")
+--- zxing-cpp-2.0.0/core/CMakeLists.txt	2023-08-08 13:26:51.918694430 +0200
++++ zxing-cpp-2.0.0/core/CMakeLists.txt	2023-08-08 13:32:23.494204854 +0200
+@@ -1,4 +1,4 @@
+-cmake_minimum_required (VERSION 3.14)
++cmake_minimum_required (VERSION 3.5)
+ 
+ project (ZXing VERSION "2.0.0")
+ set (ZXING_SONAME 3) # see https://github.com/zxing-cpp/zxing-cpp/issues/333
+@@ -457,8 +457,6 @@
+     )
+ endif()
+ 
+-target_compile_features(ZXing PUBLIC cxx_std_17)
+-
+ target_link_libraries (ZXing PRIVATE Threads::Threads)
+ 
+ add_library(ZXing::ZXing ALIAS ZXing)
diff --git a/zxing-cpp.changes b/zxing-cpp.changes
index f426ead..6039edf 100644
--- a/zxing-cpp.changes
+++ b/zxing-cpp.changes
@@ -1,3 +1,12 @@
+-------------------------------------------------------------------
+Wed Aug  9 15:07:38 UTC 2023 - Fridrich Strba <fstrba@suse.com>
+
+- Restore support for building on SLE12
+- Build with gcc7-c++ or gcc-c++ >= 7 because of C++17 requirements
+- Added patch:
+  * cmake.patch
+    + allow building with cmake 3.5 on SLE12SP5
+
 -------------------------------------------------------------------
 Tue Apr 25 08:56:24 UTC 2023 - Frederic Crozat <fcrozat@suse.com>
 
diff --git a/zxing-cpp.spec b/zxing-cpp.spec
index b21d524..a6c0b10 100644
--- a/zxing-cpp.spec
+++ b/zxing-cpp.spec
@@ -26,10 +26,16 @@ Group:          Development/Languages/C and C++
 URL:            https://github.com/nu-book/zxing-cpp/
 Source0:        %{url}/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 Source99:       baselibs.conf
-
-BuildRequires:  cmake >= 3.10
-BuildRequires:  gcc-c++
+Patch1:         cmake.patch
+BuildRequires:  cmake >= 3.5
 BuildRequires:  pkgconfig
+%if 0%{?suse_version} < 1500
+BuildRequires:  gcc7
+BuildRequires:  gcc7-c++
+%else
+BuildRequires:  gcc >= 7
+BuildRequires:  gcc-c++ >= 7
+%endif
 # only TW has fmt
 %if 0%{?suse_version} > 1500
 # For blackbox tests
@@ -65,6 +71,11 @@ other applications.
 %autosetup -p1
 
 %build
+%if 0%{?suse_version} < 1500
+export CC="gcc-7"
+export CXX="g++-7"
+%endif
+export CXXFLAGS="-std=c++17"
 # Examples require QT5-base/multimedia, but doing so creates a cycle
 # Blackbox tests require fmt
 %cmake \
@@ -84,7 +95,8 @@ export LD_LIBRARY_PATH=%{buildroot}%{_libdir}
 %endif
 %ctest
 
-%ldconfig_scriptlets -n libZXing%{sover}
+%post -n libZXing%{sover} -p /sbin/ldconfig
+%postun -n libZXing%{sover} -p /sbin/ldconfig
 
 %files -n libZXing%{sover}
 %doc README.md