From f01879d5a6fd60dba068a9eacf8bad55e809b235 Mon Sep 17 00:00:00 2001
From: Azat Khuzhin <azat@libevent.org>
Date: Mon, 21 Oct 2024 09:58:26 +0200
Subject: [PATCH] Align ELF sections to 16K boundaries
 (-Wl,-z,max-page-size=16384)

Even though the initial request was about Android, it is not only about
it, but it could be the case for Linux as well (so as Apple M1/...
chips)

And this should not affect anything, since this is just ELFs

Fixes: https://github.com/libevent/libevent/issues/1708
---
 CMakeLists.txt             |  5 +++++
 Makefile.am                |  1 +
 cmake/AddLinkerFlags.cmake | 14 ++++++++++++++
 3 files changed, 20 insertions(+)
 create mode 100644 cmake/AddLinkerFlags.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8d631852..f216b338 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,6 +72,7 @@ include(CheckPrototypeDefinition)
 include(CheckFunctionKeywords)
 include(CheckConstExists)
 include(AddCompilerFlags)
+include(AddLinkerFlags)
 include(VersionViaGit)
 
 event_fuzzy_version_from_git()
@@ -213,6 +214,8 @@ if (EVENT__ENABLE_VERBOSE_DEBUG)
     add_definitions(-DUSE_DEBUG=1)
 endif()
 
+add_linker_flags(-Wl,-z,max-page-size=16384)
+
 # make it colorful under ninja-build
 if ("${CMAKE_GENERATOR}" STREQUAL "Ninja")
     add_compiler_flags(-fdiagnostics-color=always)
@@ -1751,6 +1754,8 @@ message(STATUS "CMAKE_VERBOSE_MAKEFILE:   ${CMAKE_VERBOSE_MAKEFILE}")
 message(STATUS "CMAKE_C_FLAGS:            ${CMAKE_C_FLAGS}")
 message(STATUS "CMAKE_BUILD_TYPE:         ${CMAKE_BUILD_TYPE}")
 message(STATUS "CMAKE_C_COMPILER:         ${CMAKE_C_COMPILER} (id ${CMAKE_C_COMPILER_ID}, clang ${CLANG}, GNUC ${GNUC}, version ${CMAKE_C_COMPILER_VERSION})")
+message(STATUS "CMAKE_SHARED_LINKER_FLAGS:${CMAKE_SHARED_LINKER_FLAGS}")
+message(STATUS "CMAKE_EXE_LINKER_FLAGS:   ${CMAKE_EXE_LINKER_FLAGS}")
 message(STATUS "CMAKE_AR:                 ${CMAKE_AR}")
 message(STATUS "CMAKE_RANLIB:             ${CMAKE_RANLIB}")
 message(STATUS "CMAKE_INSTALL_PREFIX:     ${CMAKE_INSTALL_PREFIX}")
diff --git a/Makefile.am b/Makefile.am
index 75a58a67..e9a1590d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -108,6 +108,7 @@ PLATFORM_DEPENDENT_SRC = \
 
 CMAKE_FILES = \
 	cmake/AddCompilerFlags.cmake \
+	cmake/AddLinkerFlags.cmake \
 	cmake/AddEventLibrary.cmake \
 	cmake/CheckConstExists.cmake \
 	cmake/CheckFileOffsetBits.c \
diff --git a/cmake/AddLinkerFlags.cmake b/cmake/AddLinkerFlags.cmake
new file mode 100644
index 00000000..da590ee0
--- /dev/null
+++ b/cmake/AddLinkerFlags.cmake
@@ -0,0 +1,14 @@
+include(CheckLinkerFlag)
+
+macro(add_linker_flags)
+	foreach(flag ${ARGN})
+		string(REGEX REPLACE "[-.+/:= ]" "_" _flag_esc "${flag}")
+
+		check_linker_flag(C "${flag}" check_c_linker_flag_${_flag_esc})
+
+		if (check_c_linker_flag_${_flag_esc})
+			set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${flag}")
+			set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${flag}")
+		endif()
+	endforeach()
+endmacro()