Move SOVERSION to global CMakeLists, apply SOVERSION to DLL

So that multiple LTS builds can co-exist.

PiperOrigin-RevId: 639154515
Change-Id: Id34d6fbef823151a4f3c73cf7b9b340257eadd63

CMake/AbseilDll.cmake

@@ -827,7 +827,10 @@ function(absl_make_dll)
       ${_dll_libs}
       ${ABSL_DEFAULT_LINKOPTS}
   )
-  set_property(TARGET ${_dll} PROPERTY LINKER_LANGUAGE "CXX")
+  set_target_properties(${_dll} PROPERTIES
+    LINKER_LANGUAGE "CXX"
+    SOVERSION ${ABSL_SOVERSION}
+  )
   target_include_directories(
     ${_dll}
     PUBLIC

CMake/AbseilHelpers.cmake

@@ -306,7 +306,7 @@ Cflags: -I\${includedir}${PC_CFLAGS}\n")
     if(ABSL_ENABLE_INSTALL)
       set_target_properties(${_NAME} PROPERTIES
         OUTPUT_NAME "absl_${_NAME}"
-        SOVERSION 0
+        SOVERSION "${ABSL_SOVERSION}"
       )
     endif()
   else()

CMakeLists.txt

@@ -59,6 +59,7 @@ if (POLICY CMP0141)
 endif (POLICY CMP0141)
 
 project(absl LANGUAGES CXX)
+set(ABSL_SOVERSION 0)
 include(CTest)
 
 # Output directory is correct by default for most build setups. However, when

create_lts.py

@@ -116,20 +116,21 @@ def main(argv):
                   datestamp)
       })
   ReplaceStringsInFile(
-      'CMakeLists.txt', {
-          'project(absl LANGUAGES CXX)':
+      'CMakeLists.txt',
+      {
+          'project(absl LANGUAGES CXX)': (
               'project(absl LANGUAGES CXX VERSION {})'.format(datestamp)
-      })
-  # Set the SOVERSION to YYMM.0.0 - The first 0 means we only have ABI
-  # compatible changes, and the second 0 means we can increment it to
-  # mark changes as ABI-compatible, for patch releases.  Note that we
-  # only use the last two digits of the year and the month because the
-  # MacOS linker requires the first part of the SOVERSION to fit into
-  # 16 bits.
-  # https://www.sicpers.info/2013/03/how-to-version-a-mach-o-library/
-  ReplaceStringsInFile(
-      'CMake/AbseilHelpers.cmake',
-      {'SOVERSION 0': 'SOVERSION "{}.0.0"'.format(datestamp[2:6])})
+          ),
+          # Set the SOVERSION to YYMM.0.0 - The first 0 means we only have ABI
+          # compatible changes, and the second 0 means we can increment it to
+          # mark changes as ABI-compatible, for patch releases.  Note that we
+          # only use the last two digits of the year and the month because the
+          # MacOS linker requires the first part of the SOVERSION to fit into
+          # 16 bits.
+          # https://www.sicpers.info/2013/03/how-to-version-a-mach-o-library/
+          'ABSL_SOVERSION 0': 'ABSL_SOVERSION "{}.0.0"'.format(datestamp[2:6]),
+      },
+  )
   StripContentBetweenTags('CMakeLists.txt', '# absl:lts-remove-begin',
                           '# absl:lts-remove-end')