From 997aaf3a28308eba1b9156aa35ab7bca9688e9f6 Mon Sep 17 00:00:00 2001
From: Derek Mauro <761129+derekmauro@users.noreply.github.com>
Date: Thu, 25 Mar 2021 09:27:44 -0400
Subject: Apply LTS transformations for 20210324 LTS branch (#920)

* Apply LTS transformations for 20210324 LTS branch

* Change the SOVERSION to make MacOS happy

MacOS expects the first part of the SOVERSION to fit into 16 bits.
---
 CMake/AbseilHelpers.cmake |  2 +-
 CMakeLists.txt            | 14 ++------------
 absl/base/options.h       |  4 ++--
 3 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/CMake/AbseilHelpers.cmake b/CMake/AbseilHelpers.cmake
index 4f6394ab..70eaa4ca 100644
--- a/CMake/AbseilHelpers.cmake
+++ b/CMake/AbseilHelpers.cmake
@@ -263,7 +263,7 @@ Cflags: -I\${includedir}${PC_CFLAGS}\n")
     if(ABSL_ENABLE_INSTALL)
       set_target_properties(${_NAME} PROPERTIES
         OUTPUT_NAME "absl_${_NAME}"
-        SOVERSION 0
+        SOVERSION "2103.0.0"
       )
     endif()
   else()
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e09e335c..3a73f707 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,7 +45,7 @@ endif (POLICY CMP0077)
 # This must come before the project() and include(CTest) lines.
 OPTION(BUILD_TESTING "Build tests" OFF)
 
-project(absl LANGUAGES CXX)
+project(absl LANGUAGES CXX VERSION 20210324)
 include(CTest)
 
 # Output directory is correct by default for most build setups. However, when
@@ -144,17 +144,7 @@ endif()
 add_subdirectory(absl)
 
 if(ABSL_ENABLE_INSTALL)
-  # absl:lts-remove-begin(system installation is supported for LTS releases)
-  # We don't support system-wide installation
-  list(APPEND SYSTEM_INSTALL_DIRS "/usr/local" "/usr" "/opt/" "/opt/local" "c:/Program Files/${PROJECT_NAME}")
-  if(NOT DEFINED CMAKE_INSTALL_PREFIX OR CMAKE_INSTALL_PREFIX IN_LIST SYSTEM_INSTALL_DIRS)
-    message(WARNING "\
-  The default and system-level install directories are unsupported except in LTS \
-  releases of Abseil.  Please set CMAKE_INSTALL_PREFIX to install Abseil in your \
-  source or build tree directly.\
-    ")
-  endif()
-  # absl:lts-remove-end
+  
 
   # install as a subdirectory only
   install(EXPORT ${PROJECT_NAME}Targets
diff --git a/absl/base/options.h b/absl/base/options.h
index 230bf1ee..eca879af 100644
--- a/absl/base/options.h
+++ b/absl/base/options.h
@@ -205,8 +205,8 @@
 // be changed to a new, unique identifier name.  In particular "head" is not
 // allowed.
 
-#define ABSL_OPTION_USE_INLINE_NAMESPACE 0
-#define ABSL_OPTION_INLINE_NAMESPACE_NAME head
+#define ABSL_OPTION_USE_INLINE_NAMESPACE 1
+#define ABSL_OPTION_INLINE_NAMESPACE_NAME lts_20210324
 
 // ABSL_OPTION_HARDENED
 //
-- 
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