From dce6ea22fb575aaa4877c5d722cb7c651812d766 Mon Sep 17 00:00:00 2001
From: Guido Draheim <guidod@gmx.de>
Date: Sun, 16 Sep 2018 15:02:02 +0200
Subject: [PATCH] make an explicit ZZIPLIBTOOL compatibility flag to highlight
 the feature

---
 zzip/CMakeLists.txt     | 20 ++++++++++++++++++--
 zzipwrap/CMakeLists.txt | 18 ++++++++++++++++++
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/zzip/CMakeLists.txt b/zzip/CMakeLists.txt
index aea8b6f..2cfa46e 100644
--- a/zzip/CMakeLists.txt
+++ b/zzip/CMakeLists.txt
@@ -16,6 +16,7 @@ option(MSVC_STATIC_RUNTIME "Build with static runtime libs (/MT)" ON)
 option(ZZIPMMAPPED "Build libzzipmmapped (not fully portable)" ON)
 option(ZZIPFSEEKO "Build libzzipfseeko (based on posix.1 api)" ON)
 option(ZZIPCOMPAT "Build compatibility with old libzzip releases" ON)
+option(ZZIPLIBTOOL "Ensure binary compatibility with libtool" ON)
 
 
 if(ZZIPCOMPAT)
@@ -265,14 +266,29 @@ if(ZZIPCOMPAT)
         cd $DESTDIR/${libdir}
         [ -f ${lib}${libname}${librelease}${dll}.${libversion} ] || exit 0
         echo -n .. Installing: `pwd`
-        ln -svf ${lib}${libname}${librelease}${dll}.${libversion} ${lib}${libname}${dll}
-        echo -n .. Installing: `pwd`
         ln -svf ${lib}${libname}${librelease}${dll}.${libversion} ${lib}${libname}${librelease}${dll}.10
         echo -n .. Installing: `pwd`
         ln -svf ${lib}${libname}${librelease}${dll}.${libversion} ${lib}${libname}${librelease}${dll}.11
         echo -n .. Installing: `pwd`
         ln -svf ${lib}${libname}${librelease}${dll}.${libversion} ${lib}${libname}${librelease}${dll}.12
         \")")
+  endif()
+endif()
+
+if(ZZIPLIBTOOL)
+  if(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG)
+    set(lib ${CMAKE_SHARED_LIBRARY_PREFIX})
+    set(dll ${CMAKE_SHARED_LIBRARY_SUFFIX})
+    set(libdir ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
+    get_target_property(libname libzzip OUTPUT_NAME)
+    get_target_property(librelease libzzip RELEASE_POSTFIX)
+    get_target_property(libversion libzzip VERSION)
+    install(CODE "execute_process(COMMAND bash -c \"set -e
+        cd $DESTDIR/${libdir}
+        [ -f ${lib}${libname}${librelease}${dll}.${libversion} ] || exit 0
+        echo -n .. Installing: `pwd`
+        ln -svf ${lib}${libname}${librelease}${dll}.${libversion} ${lib}${libname}${dll}
+        \")")
     get_target_property(libname libzzipfseeko OUTPUT_NAME)
     get_target_property(librelease libzzipfseeko RELEASE_POSTFIX)
     get_target_property(libversion libzzipfseeko VERSION)
diff --git a/zzipwrap/CMakeLists.txt b/zzipwrap/CMakeLists.txt
index 2e6835f..c4abbf9 100644
--- a/zzipwrap/CMakeLists.txt
+++ b/zzipwrap/CMakeLists.txt
@@ -10,6 +10,7 @@ option(BUILD_SHARED_LIBS "Build a shared library" ON)
 option(BUILD_STATIC_LIBS "Build the static library" OFF)
 option(BUILD_TESTS "Build test programs" OFF)
 option(MSVC_STATIC_RUNTIME "Build with static runtime libs (/MT)" ON)
+option(ZZIPLIBTOOL "Ensure binary compatibility with libtool" ON)
 
 check_include_files ( unistd.h ZZIP_HAVE_UNISTD_H )
 # set ( ZZIP_HAVE_ZLIB_H 1 )
@@ -71,3 +72,20 @@ install(FILES ${libzzipwrap_HDRS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/zzip )
 install(TARGETS libzzipwrap
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+if(ZZIPLIBTOOL)
+  if(CMAKE_SHARED_LIBRARY_SONAME_C_FLAG)
+    set(lib ${CMAKE_SHARED_LIBRARY_PREFIX})
+    set(dll ${CMAKE_SHARED_LIBRARY_SUFFIX})
+    set(libdir ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
+    get_target_property(libname libzzipwrap OUTPUT_NAME)
+    get_target_property(librelease libzzipwrap RELEASE_POSTFIX)
+    get_target_property(libversion libzzipwrap VERSION)
+    install(CODE "execute_process(COMMAND bash -c \"set -e
+        cd $DESTDIR/${libdir}
+        [ -f ${lib}${libname}${librelease}${dll}.${libversion} ] || exit 0
+        echo -n .. Installing: `pwd`
+        ln -svf ${lib}${libname}${librelease}${dll}.${libversion} ${lib}${libname}${dll}
+        \")")
+  endif()
+endif()
-- 
2.40.0