From c55d6639b2c98e37f15ede538351726cb24c165b Mon Sep 17 00:00:00 2001
From: Cary Phillips <cary@ilm.com>
Date: Wed, 13 Mar 2024 16:50:58 -0700
Subject: [PATCH] Add IMATH_INSTALL cmake option

This part of #366, backported for the 3.1 branch.

Signed-off-by: Cary Phillips <cary@ilm.com>
---
 CMakeLists.txt             |  1 +
 config/CMakeLists.txt      | 52 ++++++++++++++++++++------------------
 config/LibraryDefine.cmake | 46 ++++++++++++++++++---------------
 3 files changed, 54 insertions(+), 45 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9770a90e..4420a51f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,6 +51,7 @@ include(config/ImathSetup.cmake)
 
 message(STATUS "Configure ${IMATH_PACKAGE_NAME}, library API version: ${IMATH_LIB_VERSION}")
 
+option(IMATH_INSTALL "Install Imath library" ON)
 # Config headers and package config files
 add_subdirectory(config)
 
diff --git a/config/CMakeLists.txt b/config/CMakeLists.txt
index f6a70280..8c1c3604 100644
--- a/config/CMakeLists.txt
+++ b/config/CMakeLists.txt
@@ -19,14 +19,16 @@ target_include_directories(ImathConfig INTERFACE
   $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
   $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/${IMATH_OUTPUT_SUBDIR}>)
 
-install(
-  FILES
-    ${CMAKE_CURRENT_BINARY_DIR}/ImathConfig.h
-  DESTINATION
-    ${CMAKE_INSTALL_INCLUDEDIR}/${IMATH_OUTPUT_SUBDIR}
-)
-
-install(TARGETS ImathConfig EXPORT ${PROJECT_NAME})
+if (IMATH_INSTALL)
+  install(
+    FILES
+      ${CMAKE_CURRENT_BINARY_DIR}/ImathConfig.h
+    DESTINATION
+      ${CMAKE_INSTALL_INCLUDEDIR}/${IMATH_OUTPUT_SUBDIR}
+  )
+
+  install(TARGETS ImathConfig EXPORT ${PROJECT_NAME})
+endif()
 
 add_library(Imath::Config ALIAS ImathConfig)
 
@@ -80,19 +82,21 @@ write_basic_package_version_file("${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Con
   COMPATIBILITY SameMajorVersion
 )
 
-install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
-              ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
-  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
-)
-
-install(EXPORT ${PROJECT_NAME}
-  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
-  FILE ${PROJECT_NAME}Targets.cmake
-  NAMESPACE ${PROJECT_NAME}::
-  EXPORT_LINK_INTERFACE_LIBRARIES
-)
-
-export(EXPORT ${PROJECT_NAME}
-  FILE "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Targets.cmake"
-  NAMESPACE ${PROJECT_NAME}::
-)
+if (IMATH_INSTALL)
+  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+                ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+  )
+  
+  install(EXPORT ${PROJECT_NAME}
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+    FILE ${PROJECT_NAME}Targets.cmake
+    NAMESPACE ${PROJECT_NAME}::
+    EXPORT_LINK_INTERFACE_LIBRARIES
+  )
+
+  export(EXPORT ${PROJECT_NAME}
+    FILE "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Targets.cmake"
+    NAMESPACE ${PROJECT_NAME}::
+  )
+endif()
diff --git a/config/LibraryDefine.cmake b/config/LibraryDefine.cmake
index 48689547..ff5c935c 100644
--- a/config/LibraryDefine.cmake
+++ b/config/LibraryDefine.cmake
@@ -84,27 +84,31 @@ function(IMATH_DEFINE_LIBRARY libname)
   )
   add_library(${PROJECT_NAME}::${libname} ALIAS ${libname})
 
-  install(TARGETS ${libname}
-    EXPORT ${PROJECT_NAME}
-    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-    INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-    PUBLIC_HEADER
-      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${IMATH_OUTPUT_SUBDIR}
-  )
-  if(BUILD_SHARED_LIBS AND (NOT "${IMATH_LIB_SUFFIX}" STREQUAL "") AND IMATH_INSTALL_SYM_LINK)
-    string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
-    set(verlibname ${CMAKE_SHARED_LIBRARY_PREFIX}${libname}${IMATH_LIB_SUFFIX}${CMAKE_${uppercase_CMAKE_BUILD_TYPE}_POSTFIX}${CMAKE_SHARED_LIBRARY_SUFFIX})
-    set(baselibname ${CMAKE_SHARED_LIBRARY_PREFIX}${libname}${CMAKE_${uppercase_CMAKE_BUILD_TYPE}_POSTFIX}${CMAKE_SHARED_LIBRARY_SUFFIX})
-    if(WIN32)
-      install(CODE "execute_process(COMMAND ${CMAKE_COMMAND} -E chdir \"\$ENV\{DESTDIR\}${CMAKE_INSTALL_FULL_BINDIR}\" ${CMAKE_COMMAND} -E create_symlink ${verlibname} ${baselibname})")
-      install(CODE "message(STATUS \"Creating symlink ${CMAKE_INSTALL_FULL_BINDIR}/${baselibname} -> ${verlibname}\")")
-    else()
-      install(CODE "execute_process(COMMAND ${CMAKE_COMMAND} -E chdir \"\$ENV\{DESTDIR\}${CMAKE_INSTALL_FULL_LIBDIR}\" ${CMAKE_COMMAND} -E create_symlink ${verlibname} ${baselibname})")
-      install(CODE "message(STATUS \"Creating symlink ${CMAKE_INSTALL_FULL_LIBDIR}/${baselibname} -> ${verlibname}\")")
+  if (IMATH_INSTALL)
+    
+    install(TARGETS ${libname}
+      EXPORT ${PROJECT_NAME}
+      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+      INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+      PUBLIC_HEADER
+        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${IMATH_OUTPUT_SUBDIR}
+    )
+    if(BUILD_SHARED_LIBS AND (NOT "${IMATH_LIB_SUFFIX}" STREQUAL "") AND IMATH_INSTALL_SYM_LINK)
+      string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
+      set(verlibname ${CMAKE_SHARED_LIBRARY_PREFIX}${libname}${IMATH_LIB_SUFFIX}${CMAKE_${uppercase_CMAKE_BUILD_TYPE}_POSTFIX}${CMAKE_SHARED_LIBRARY_SUFFIX})
+      set(baselibname ${CMAKE_SHARED_LIBRARY_PREFIX}${libname}${CMAKE_${uppercase_CMAKE_BUILD_TYPE}_POSTFIX}${CMAKE_SHARED_LIBRARY_SUFFIX})
+      if(WIN32)
+        install(CODE "execute_process(COMMAND ${CMAKE_COMMAND} -E chdir \"\$ENV\{DESTDIR\}${CMAKE_INSTALL_FULL_BINDIR}\" ${CMAKE_COMMAND} -E create_symlink ${verlibname} ${baselibname})")
+        install(CODE "message(STATUS \"Creating symlink ${CMAKE_INSTALL_FULL_BINDIR}/${baselibname} -> ${verlibname}\")")
+      else()
+        install(CODE "execute_process(COMMAND ${CMAKE_COMMAND} -E chdir \"\$ENV\{DESTDIR\}${CMAKE_INSTALL_FULL_LIBDIR}\" ${CMAKE_COMMAND} -E create_symlink ${verlibname} ${baselibname})")
+        install(CODE "message(STATUS \"Creating symlink ${CMAKE_INSTALL_FULL_LIBDIR}/${baselibname} -> ${verlibname}\")")
+      endif()
+      set(verlibname)
+      set(baselibname)
     endif()
-    set(verlibname)
-    set(baselibname)
+
   endif()
 endfunction()