Merge pull request #2472 from Exiv2/fix_soversion

Fix shared object versioning

CMakeLists.txt

@@ -12,6 +12,15 @@ project(exiv2          # use TWEAK to categorize the build
     LANGUAGES C CXX
 )
 
+# Shared Object versioning (SemVer-like: must bump major on API breakage)
+if(PROJECT_VERSION_MAJOR EQUAL 0)
+  # support legacy scheme (e.g. 0.27.x -> 27)
+  set(EXIV2LIB_SOVERSION ${PROJECT_VERSION_MINOR})
+else()
+  # restart from 30
+  math(EXPR EXIV2LIB_SOVERSION "30 + (${PROJECT_VERSION_MAJOR} - 1)")
+endif()
+
 if(NOT CMAKE_BUILD_TYPE)
   set (CMAKE_BUILD_TYPE Release)
 endif()

meson.build

@@ -32,6 +32,11 @@ exiv_conf = configure_file(output: 'exiv2lib_export.h', configuration: exiv_api)
 cdata = configuration_data()
 cdata.set('EXV_PACKAGE_NAME', meson.project_name())
 ver = meson.project_version().split('.')
+if ver[0] == '0'
+  sover = ver[1].to_int()
+else
+  sover = 30 + (ver[0].to_int() - 1)
+endif
 cdata.set('PROJECT_VERSION_MAJOR', ver[0])
 cdata.set('PROJECT_VERSION_MINOR', ver[1])
 cdata.set('PROJECT_VERSION_PATCH', ver[2])
@@ -308,6 +313,7 @@ exiv2 = library(
   xmp_lib,
   cpp_args: cargs,
   version: meson.project_version(),
+  soversion: sover,
   gnu_symbol_visibility: 'hidden',
   link_with: convertlib,
   dependencies: [deps, exiv2int_dep],

src/CMakeLists.txt

@@ -160,7 +160,7 @@ endif()
 
 set_target_properties( exiv2lib PROPERTIES
     VERSION       ${PROJECT_VERSION}
-    SOVERSION     ${PROJECT_VERSION_MINOR}
+    SOVERSION     ${EXIV2LIB_SOVERSION}
     OUTPUT_NAME   exiv2
     PDB_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     COMPILE_FLAGS ${EXTRA_COMPILE_FLAGS}