ortools-clone/patches/bzip2.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c4b0b6e..30f7652 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,10 @@
 cmake_minimum_required(VERSION 3.12)
 
+# option() honors normal variables.
+if (POLICY CMP0077)
+  cmake_policy(SET CMP0077 NEW)
+endif()
+
 project(bzip2
         VERSION 1.1.0
         DESCRIPTION "This Bzip2/libbz2 a program and library for lossless block-sorting data compression."
@@ -283,8 +288,8 @@ set(BZ2_SOURCES
 add_library(bz2_ObjLib OBJECT)
 target_sources(bz2_ObjLib
     PRIVATE   ${BZ2_SOURCES}
-    PUBLIC    ${CMAKE_CURRENT_SOURCE_DIR}/bzlib_private.h
-    INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/bzlib.h)
+    bzlib_private.h
+    bzlib.h)
 
 # Windows resource file
 set(BZ2_RES "")
@@ -299,21 +304,30 @@ endif()
 
 if(ENABLE_SHARED_LIB)
     # The libbz2 shared library.
-    add_library(bz2 SHARED ${BZ2_RES})
-    target_sources(bz2
-        PRIVATE   ${BZ2_SOURCES}
-                  ${CMAKE_CURRENT_SOURCE_DIR}/libbz2.def
-        PUBLIC    ${CMAKE_CURRENT_SOURCE_DIR}/bzlib_private.h
-        INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/bzlib.h)
+    add_library(BZip2 SHARED ${BZ2_RES})
+    target_sources(BZip2
+      PRIVATE   ${BZ2_SOURCES}
+      libbz2.def
+      bzlib_private.h
+      bzlib.h)
+    target_include_directories(BZip2 PUBLIC
+      $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
+      $<INSTALL_INTERFACE:include>
+    )
 
     # Always use '-fPIC'/'-fPIE' option for shared libraries.
-    set_property(TARGET bz2 PROPERTY POSITION_INDEPENDENT_CODE ON)
+    set_property(TARGET BZip2 PROPERTY POSITION_INDEPENDENT_CODE ON)
 
-    set_target_properties(bz2 PROPERTIES
+    set_target_properties(BZip2 PROPERTIES
         COMPILE_FLAGS "${WARNCFLAGS}"
-        VERSION ${LT_VERSION} SOVERSION ${LT_SOVERSION})
-    install(TARGETS bz2 DESTINATION ${CMAKE_INSTALL_LIBDIR})
+        VERSION ${LT_VERSION} SOVERSION ${LT_SOVERSION}
+        OUTPUT_NAME bz2
+    )
+    install(TARGETS BZip2
+      EXPORT ${PROJECT_NAME}Targets
+      DESTINATION ${CMAKE_INSTALL_LIBDIR})
     install(FILES bzlib.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+    add_library(BZip2::BZip2 ALIAS BZip2)
 
     if(USE_OLD_SONAME)
         # Hack to support the old libbz2.so.1.0 version by including an extra copy.
@@ -323,16 +337,22 @@ if(ENABLE_SHARED_LIB)
             add_library(bz2_old_soname SHARED ${BZ2_RES})
             target_sources(bz2_old_soname
                 PRIVATE   ${BZ2_SOURCES}
-                          ${CMAKE_CURRENT_SOURCE_DIR}/libbz2.def
-                PUBLIC    ${CMAKE_CURRENT_SOURCE_DIR}/bzlib_private.h
-                INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/bzlib.h
+                libbz2.def
+                bzlib_private.h
+                bzlib.h
+            )
+            target_include_directories(bz2_old_soname PUBLIC
+              $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
+              $<INSTALL_INTERFACE:include>
             )
             set_target_properties(bz2_old_soname PROPERTIES
                 COMPILE_FLAGS "${WARNCFLAGS}"
                 VERSION ${LT_SOVERSION}.${LT_AGE} SOVERSION ${LT_SOVERSION}.${LT_AGE}
                 OUTPUT_NAME bz2
             )
-            install(TARGETS bz2_old_soname DESTINATION ${CMAKE_INSTALL_LIBDIR})
+            install(TARGETS bz2_old_soname
+              EXPORT ${PROJECT_NAME}Targets
+              DESTINATION ${CMAKE_INSTALL_LIBDIR})
         endif()
     endif()
 endif()
@@ -341,9 +361,13 @@ if(ENABLE_STATIC_LIB)
     # The libbz2 static library.
     add_library(bz2_static STATIC)
     target_sources(bz2_static
-        PRIVATE     ${BZ2_SOURCES}
-        PUBLIC      ${CMAKE_CURRENT_SOURCE_DIR}/bzlib_private.h
-        INTERFACE   ${CMAKE_CURRENT_SOURCE_DIR}/bzlib.h)
+      PRIVATE     ${BZ2_SOURCES}
+      bzlib_private.h
+      bzlib.h)
+    target_include_directories(bz2_static PUBLIC
+      $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
+      $<INSTALL_INTERFACE:include>
+    )
 
     # Use '-fPIC'/'-fPIE' option for static libraries by default.
     # You may build with ENABLE_STATIC_LIB_IS_PIC=OFF to disable PIC for the static library.
@@ -357,8 +381,13 @@ if(ENABLE_STATIC_LIB)
         SOVERSION           ${LT_SOVERSION}
         ARCHIVE_OUTPUT_NAME bz2_static)
     target_compile_definitions(bz2_static PUBLIC BZ2_STATICLIB)
-    install(TARGETS bz2_static DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    install(TARGETS bz2_static
+      EXPORT ${PROJECT_NAME}Targets
+      DESTINATION ${CMAKE_INSTALL_LIBDIR})
     install(FILES bzlib.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+    if(NOT TARGET BZip2)
+      add_library(BZip2::BZip2 ALIAS bz2_static)
+    endif()
 endif()
 
 if(ENABLE_APP)
@@ -373,7 +402,9 @@ if(ENABLE_APP)
     else()
         target_compile_definitions(bzip2 PUBLIC BZ_LCCWIN32=0 BZ_UNIX)
     endif()
-    install(TARGETS bzip2 DESTINATION ${CMAKE_INSTALL_BINDIR})
+    install(TARGETS bzip2
+      EXPORT ${PROJECT_NAME}Targets
+      DESTINATION ${CMAKE_INSTALL_BINDIR})
 
     # Create bzip2 copies bzcat and bunzip.
     # The default behavior is altered in bzip2.c code by checking the program name.
@@ -391,7 +422,9 @@ if(ENABLE_APP)
     else()
         target_compile_definitions(bzip2recover PUBLIC BZ_LCCWIN32=0 BZ_UNIX)
     endif()
-    install(TARGETS bzip2recover DESTINATION ${CMAKE_INSTALL_BINDIR})
+    install(TARGETS bzip2recover
+      EXPORT ${PROJECT_NAME}Targets
+      DESTINATION ${CMAKE_INSTALL_BINDIR})
 
     if(ENABLE_EXAMPLES)
         if(ENABLE_SHARED_LIB)
@@ -399,8 +432,10 @@ if(ENABLE_APP)
             add_executable(dlltest)
             target_sources(dlltest
                 PRIVATE   dlltest.c)
-            target_link_libraries(dlltest bz2)
-            install(TARGETS dlltest DESTINATION ${CMAKE_INSTALL_BINDIR})
+            target_link_libraries(dlltest BZip2)
+            install(TARGETS dlltest
+              EXPORT ${PROJECT_NAME}Targets
+              DESTINATION ${CMAKE_INSTALL_BINDIR})
         endif()
     endif()
 
@@ -419,6 +454,10 @@ if(ENABLE_APP)
 
 endif()
 
+install(EXPORT ${PROJECT_NAME}Targets
+  NAMESPACE BZip2::
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
+
 if(ENABLE_APP AND Python3_FOUND)
     enable_testing()
     add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND})