From 10f3e6117b1154ca8e7e744809d82988f0ff481d Mon Sep 17 00:00:00 2001
From: Derek Mauro <dmauro@google.com>
Date: Tue, 16 Jan 2024 08:53:54 -0800
Subject: [PATCH] Add a note about how to link absl::log_flags under CMake to
 workaround the lack of a feature equivalent to Bazel's alwayslink=True

PiperOrigin-RevId: 598855446
Change-Id: I0bb3bc40005908106eb7a7252572e3af153a7f5c
---
 CMake/AbseilHelpers.cmake | 2 +-
 absl/log/CMakeLists.txt   | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/CMake/AbseilHelpers.cmake b/CMake/AbseilHelpers.cmake
index 18fb75ffd7f..bd1c71b073e 100644
--- a/CMake/AbseilHelpers.cmake
+++ b/CMake/AbseilHelpers.cmake
@@ -80,7 +80,7 @@ endif()
 #     absl::fantastic_lib
 # )
 #
-# TODO: Implement "ALWAYSLINK"
+# TODO(b/320467376): Implement "ALWAYSLINK".
 function(absl_cc_library)
   cmake_parse_arguments(ABSL_CC_LIB
     "DISABLE_INSTALL;PUBLIC;TESTONLY"
diff --git a/absl/log/CMakeLists.txt b/absl/log/CMakeLists.txt
index 3c61fe8786a..a7d8b69031f 100644
--- a/absl/log/CMakeLists.txt
+++ b/absl/log/CMakeLists.txt
@@ -461,6 +461,11 @@ absl_cc_library(
   PUBLIC
 )
 
+# Warning: Many linkers will strip the contents of this library because its
+# symbols are only used in a global constructor. A workaround is for clients
+# to link this using $<LINK_LIBRARY:WHOLE_ARCHIVE,absl::log_flags> instead of
+# the plain absl::log_flags.
+# TODO(b/320467376): Implement the equivalent of Bazel's alwayslink=True.
 absl_cc_library(
   NAME
     log_flags