tools/bzip2: switch to cmake

Fixes portability issues on macOS.
CMakeLists.txt is a stripped-down backport from bzip2 upstream

Signed-off-by: Felix Fietkau <nbd@nbd.name>

3 files changed, 384 insertions, 423 deletions

diff --git a/tools/bzip2/Makefile b/tools/bzip2/Makefile
index 0c5a92849a..86df143826 100644
--- a/tools/bzip2/Makefile
+++ b/tools/bzip2/Makefile
@@ -22,31 +22,11 @@ PKG_CPE_ID:=cpe:/a:bzip:bzip2
 HOST_BUILD_PARALLEL:=1
 
 include $(INCLUDE_DIR)/host-build.mk
+include $(INCLUDE_DIR)/cmake.mk
 
 HOSTCC := $(HOSTCC_NOCACHE)
 HOST_CFLAGS += $(HOST_FPIC)
 
-HOST_MAKE_FLAGS+= \
-	CFLAGS="$(HOST_CFLAGS)" \
-	LDFLAGS="$(HOST_LDFLAGS)" \
-	ENABLE_BIN_SHARED=1 \
-	ENABLE_BIN_STATIC=0 \
-	ENABLE_LIB_SHARED=1 \
-	ENABLE_LIB_STATIC=1 \
-	ENABLE_DEV=1 \
-	ENABLE_DOCS=1 \
-	ENABLE_TESTS=0 \
-	PREFIX="$(HOST_BUILD_PREFIX)"
-
-define Host/Configure
-endef
-
-define Host/Uninstall
-	$(call Host/Compile/Default,uninstall)
-	$(call Host/Compile/Default,clean)
-endef
-
-define Host/Clean
-endef
+CMAKE_HOST_OPTIONS += -DENABLE_EXAMPLES=off
 
 $(eval $(call HostBuild))
diff --git a/tools/bzip2/patches/021-merge-and-improve-makefiles.patch b/tools/bzip2/patches/021-merge-and-improve-makefiles.patch
deleted file mode 100644
index 9d98c34bdb..0000000000
--- a/tools/bzip2/patches/021-merge-and-improve-makefiles.patch
+++ /dev/null
@@ -1,401 +0,0 @@
---- a/bzip2.c
-+++ b/bzip2.c
-@@ -54,7 +54,7 @@
- #include <math.h>
- #include <errno.h>
- #include <ctype.h>
--#include "bzlib.h"
-+#include <bzlib.h>
- 
- #define ERROR_IF_EOF(i)       { if ((i) == EOF)  ioError(); }
- #define ERROR_IF_NOT_ZERO(i)  { if ((i) != 0)    ioError(); }
---- a/bzlib_private.h
-+++ b/bzlib_private.h
-@@ -30,7 +30,7 @@
- #include <string.h>
- #endif
- 
--#include "bzlib.h"
-+#include <bzlib.h>
- 
- 
- 
---- a/Makefile
-+++ b/Makefile
-@@ -21,11 +21,38 @@
- LDFLAGS=
- 
- BIGFILES=-D_FILE_OFFSET_BITS=64
--CFLAGS=-Wall -Winline -O2 -g $(BIGFILES)
-+CFLAGS_COMMON=-Wall -Winline -O2 -g $(BIGFILES) -I.
-+CFLAGS_NOPIC=$(filter-out -O%,$(CFLAGS)) $(CFLAGS_COMMON)
-+CFLAGS_PIC=$(filter-out -O%,$(CFLAGS)) -fpic -fPIC $(CFLAGS_COMMON)
- 
- # Where you want it installed when you do 'make install'
--PREFIX=/usr/local
--
-+PREFIX?=/usr/local
-+ENABLE_BIN_STATIC?=1
-+ENABLE_BIN_SHARED?=1
-+ENABLE_LIB_STATIC?=1
-+ENABLE_LIB_SHARED?=1
-+ENABLE_DEV?=1
-+ENABLE_DOCS?=1
-+ENABLE_TESTS?=1
-+
-+ifeq ($(ENABLE_BIN_STATIC),1)
-+  ENABLE_BIN=1
-+  ifneq ($(ENABLE_LIB_STATIC),1)
-+    ENABLE_LIB_STATIC=1
-+  endif
-+endif
-+ifeq ($(ENABLE_BIN_SHARED),1)
-+  ENABLE_BIN=1
-+  ifneq ($(ENABLE_LIB_SHARED),1)
-+    ENABLE_LIB_STATIC=1
-+  endif
-+endif
-+ifeq ($(ENABLE_LIB_STATIC),1)
-+  ENABLE_LIB=1
-+endif
-+ifeq ($(ENABLE_LIB_SHARED),1)
-+  ENABLE_LIB=1
-+endif
- 
- OBJS= blocksort.o  \
-       huffman.o    \
-@@ -35,15 +62,38 @@
-       decompress.o \
-       bzlib.o
- 
--all: libbz2.a bzip2 bzip2recover test
--
--bzip2: libbz2.a bzip2.o
--	$(CC) $(CFLAGS) $(LDFLAGS) -o bzip2 bzip2.o -L. -lbz2
-+TGTS_all:=
-+TGTS_bzip2:=bzip2.o
-+TGTS_check:=
-+TGTS_install:=
-+ifeq ($(ENABLE_LIB),1)
-+  TGTS_all+=libbz2
-+  TGTS_bzip2+=libbz2
-+endif
-+ifeq ($(ENABLE_BIN),1)
-+  TGTS_all+=bzip2 bzip2recover
-+  TGTS_install+=bzip2 bzip2recover
-+endif
-+ifeq ($(ENABLE_TESTS),1)
-+  TGTS_all+=test
-+  TGTS_check+=test
-+endif
-+ 
-+all: $(TGTS_all)
-+
-+bzip2: $(TGTS_bzip2)
-+ifeq ($(ENABLE_BIN_STATIC),1)
-+	$(CC) $(CFLAGS_NOPIC) $(LDFLAGS) -o bzip2 bzip2.o -L. -lbz2
-+endif
-+ifeq ($(ENABLE_BIN_SHARED),1)
-+	$(CC) $(CFLAGS_PIC) -o bzip2-shared bzip2.o libbz2.so.1.0
-+endif
- 
- bzip2recover: bzip2recover.o
--	$(CC) $(CFLAGS) $(LDFLAGS) -o bzip2recover bzip2recover.o
-+	$(CC) $(CFLAGS_NOPIC) $(LDFLAGS) -o bzip2recover bzip2recover.o
- 
--libbz2.a: $(OBJS)
-+libbz2: $(OBJS)
-+ifeq ($(ENABLE_LIB_STATIC),1)
- 	rm -f libbz2.a
- 	$(AR) cq libbz2.a $(OBJS)
- 	@if ( test -f $(RANLIB) -o -f /usr/bin/ranlib -o \
-@@ -51,8 +101,18 @@
- 		echo $(RANLIB) libbz2.a ; \
- 		$(RANLIB) libbz2.a ; \
- 	fi
-+endif
-+ifeq ($(ENABLE_LIB_SHARED),1)
-+	$(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 $(LDFLAGS) -o libbz2.so.1.0.8 $(OBJS)
-+	rm -f libbz2.so.1.0
-+	rm -f libbz2.so.1
-+	rm -f libbz2.so
-+	ln -s libbz2.so.1.0.8 libbz2.so.1.0
-+	ln -s libbz2.so.1.0 libbz2.so.1
-+	ln -s libbz2.so.1 libbz2.so
-+endif
- 
--check: test
-+check: $(TGTS_check)
- test: bzip2
- 	@cat words1
- 	./bzip2 -1  < sample1.ref > sample1.rb2
-@@ -69,69 +129,153 @@
- 	cmp sample3.tst sample3.ref
- 	@cat words3
- 
--install: bzip2 bzip2recover
-+install: $(TGTS_install)
-+ifeq ($(ENABLE_BIN),1)
- 	if ( test ! -d $(PREFIX)/bin ) ; then mkdir -p $(PREFIX)/bin ; fi
-+endif
-+ifeq ($(ENABLE_LIB),1)
- 	if ( test ! -d $(PREFIX)/lib ) ; then mkdir -p $(PREFIX)/lib ; fi
-+endif
-+ifeq ($(ENABLE_DEV),1)
-+	if ( test ! -d $(PREFIX)/include ) ; then mkdir -p $(PREFIX)/include ; fi
-+endif
-+ifeq ($(ENABLE_DOCS),1)
- 	if ( test ! -d $(PREFIX)/man ) ; then mkdir -p $(PREFIX)/man ; fi
- 	if ( test ! -d $(PREFIX)/man/man1 ) ; then mkdir -p $(PREFIX)/man/man1 ; fi
--	if ( test ! -d $(PREFIX)/include ) ; then mkdir -p $(PREFIX)/include ; fi
-+endif
-+ifeq ($(ENABLE_BIN),1)
-+  ifeq ($(ENABLE_BIN_STATIC),1)
- 	cp -f bzip2 $(PREFIX)/bin/bzip2
--	cp -f bzip2 $(PREFIX)/bin/bunzip2
--	cp -f bzip2 $(PREFIX)/bin/bzcat
-+	chmod a+rx $(PREFIX)/bin/bzip2
-+  endif
-+  ifeq ($(ENABLE_BIN_SHARED),1)
-+    ifeq ($(ENABLE_BIN_STATIC),1)
-+	cp -f bzip2-shared $(PREFIX)/bin/bzip2-shared
-+	chmod a+rx $(PREFIX)/bin/bzip2-shared
-+    else
-+	cp -f bzip2-shared $(PREFIX)/bin/bzip2
-+    endif
-+  endif
-+	rm -f $(PREFIX)/bin/bunzip2
-+	rm -f $(PREFIX)/bin/bzcat
-+	( cd $(PREFIX)/bin && ln -s bzip2 bunzip2 )
-+	( cd $(PREFIX)/bin && ln -s bzip2 bzcat )
-+	rm -f $(PREFIX)/bin/bunzip2-shared
-+	rm -f $(PREFIX)/bin/bzcat-shared
-+  ifeq ($(ENABLE_BIN_SHARED),1)
-+    ifeq ($(ENABLE_BIN_STATIC),1)
-+	( cd $(PREFIX)/bin && ln -s bzip2-shared bunzip2-shared )
-+	( cd $(PREFIX)/bin && ln -s bzip2-shared bzcat-shared )
-+    endif
-+  endif
- 	cp -f bzip2recover $(PREFIX)/bin/bzip2recover
--	chmod a+x $(PREFIX)/bin/bzip2
--	chmod a+x $(PREFIX)/bin/bunzip2
--	chmod a+x $(PREFIX)/bin/bzcat
--	chmod a+x $(PREFIX)/bin/bzip2recover
--	cp -f bzip2.1 $(PREFIX)/man/man1
--	chmod a+r $(PREFIX)/man/man1/bzip2.1
--	cp -f bzlib.h $(PREFIX)/include
--	chmod a+r $(PREFIX)/include/bzlib.h
--	cp -f libbz2.a $(PREFIX)/lib
--	chmod a+r $(PREFIX)/lib/libbz2.a
-+	chmod a+rx $(PREFIX)/bin/bzip2recover
- 	cp -f bzgrep $(PREFIX)/bin/bzgrep
--	ln -s -f $(PREFIX)/bin/bzgrep $(PREFIX)/bin/bzegrep
--	ln -s -f $(PREFIX)/bin/bzgrep $(PREFIX)/bin/bzfgrep
--	chmod a+x $(PREFIX)/bin/bzgrep
-+	chmod a+rx $(PREFIX)/bin/bzgrep
-+	rm -f $(PREFIX)/bin/bzegrep
-+	rm -f $(PREFIX)/bin/bzfgrep
-+	( cd $(PREFIX)/bin && ln -s bzgrep bzegrep )
-+	( cd $(PREFIX)/bin && ln -s bzgrep bzfgrep )
- 	cp -f bzmore $(PREFIX)/bin/bzmore
--	ln -s -f $(PREFIX)/bin/bzmore $(PREFIX)/bin/bzless
--	chmod a+x $(PREFIX)/bin/bzmore
-+	chmod a+rx $(PREFIX)/bin/bzmore
-+	rm -f $(PREFIX)/bin/bzless
-+	( cd $(PREFIX)/bin && ln -s bzmore bzless )
-+	rm -f $(PREFIX)/bin/bzcmp
- 	cp -f bzdiff $(PREFIX)/bin/bzdiff
--	ln -s -f $(PREFIX)/bin/bzdiff $(PREFIX)/bin/bzcmp
--	chmod a+x $(PREFIX)/bin/bzdiff
--	cp -f bzgrep.1 bzmore.1 bzdiff.1 $(PREFIX)/man/man1
--	chmod a+r $(PREFIX)/man/man1/bzgrep.1
--	chmod a+r $(PREFIX)/man/man1/bzmore.1
--	chmod a+r $(PREFIX)/man/man1/bzdiff.1
-+	chmod a+rx $(PREFIX)/bin/bzdiff
-+	( cd $(PREFIX)/bin && ln -s bzdiff bzcmp )
-+endif
-+ifeq ($(ENABLE_DEV),1)
-+	cp -f bzlib.h $(PREFIX)/include
-+	chmod a+r $(PREFIX)/include/bzlib.h
-+endif
-+ifeq ($(ENABLE_DOCS),1)
-+	cp -f bzip2.1 bzgrep.1 bzmore.1 bzdiff.1 $(PREFIX)/man/man1
- 	echo ".so man1/bzgrep.1" > $(PREFIX)/man/man1/bzegrep.1
- 	echo ".so man1/bzgrep.1" > $(PREFIX)/man/man1/bzfgrep.1
- 	echo ".so man1/bzmore.1" > $(PREFIX)/man/man1/bzless.1
- 	echo ".so man1/bzdiff.1" > $(PREFIX)/man/man1/bzcmp.1
-+	chmod a+r $(PREFIX)/man/man1/bzip2.1
-+	chmod a+r $(PREFIX)/man/man1/bzgrep.1
-+	chmod a+r $(PREFIX)/man/man1/bzmore.1
-+	chmod a+r $(PREFIX)/man/man1/bzdiff.1
-+	chmod a+r $(PREFIX)/man/man1/bzegrep.1
-+	chmod a+r $(PREFIX)/man/man1/bzfgrep.1
-+	chmod a+r $(PREFIX)/man/man1/bzless.1
-+	chmod a+r $(PREFIX)/man/man1/bzcmp.1
-+endif
-+ifeq ($(ENABLE_LIB_SHARED),1)
-+	cp -f libbz2.so.1.0.8 $(PREFIX)/lib
-+	chmod a+r $(PREFIX)/lib/libbz2.so.1.0.8
-+	rm -f $(PREFIX)/lib/libbz2.so.1.0
-+	rm -f $(PREFIX)/lib/libbz2.so.1
-+	rm -f $(PREFIX)/lib/libbz2.so
-+	( cd $(PREFIX)/lib && ln -s libbz2.so.1.0.8 libbz2.so.1.0 )
-+	( cd $(PREFIX)/lib && ln -s libbz2.so.1.0 libbz2.so.1 )
-+	( cd $(PREFIX)/lib && ln -s libbz2.so.1 libbz2.so )
-+endif
-+ifeq ($(ENABLE_LIB_STATIC),1)
-+	cp -f libbz2.a $(PREFIX)/lib
-+	chmod a+r $(PREFIX)/lib/libbz2.a
-+endif
-+
-+uninstall:
-+	rm -f $(PREFIX)/bin/bzip2
-+	rm -f $(PREFIX)/bin/bzip2-shared
-+	rm -f $(PREFIX)/bin/bunzip2
-+	rm -f $(PREFIX)/bin/bzcat
-+	rm -f $(PREFIX)/bin/bunzip2-shared
-+	rm -f $(PREFIX)/bin/bzcat-shared
-+	rm -f $(PREFIX)/bin/bzip2recover
-+	rm -f $(PREFIX)/bin/bzgrep
-+	rm -f $(PREFIX)/bin/bzegrep
-+	rm -f $(PREFIX)/bin/bzfgrep
-+	rm -f $(PREFIX)/bin/bzmore
-+	rm -f $(PREFIX)/bin/bzless
-+	rm -f $(PREFIX)/bin/bzdiff
-+	rm -f $(PREFIX)/bin/bzcmp
-+	rm -f $(PREFIX)/include/bzlib.h
-+	rm -f $(PREFIX)/lib/libbz2.so.1.0.8
-+	rm -f $(PREFIX)/lib/libbz2.so.1.0
-+	rm -f $(PREFIX)/lib/libbz2.so.1
-+	rm -f $(PREFIX)/lib/libbz2.so
-+	rm -f $(PREFIX)/lib/libbz2.a
-+	rm -f $(PREFIX)/man/man1/bzip2.1
-+	rm -f $(PREFIX)/man/man1/bzgrep.1
-+	rm -f $(PREFIX)/man/man1/bzmore.1
-+	rm -f $(PREFIX)/man/man1/bzdiff.1
-+	rm -f $(PREFIX)/man/man1/bzegrep.1
-+	rm -f $(PREFIX)/man/man1/bzfgrep.1
-+	rm -f $(PREFIX)/man/man1/bzless.1
-+	rm -f $(PREFIX)/man/man1/bzcmp.1
-+	(rmdir $(PREFIX)/bin $(PREFIX)/include $(PREFIX)/lib $(PREFIX)/man/man1 $(PREFIX)/man || true ) 2> /dev/null
- 
- clean: 
--	rm -f *.o libbz2.a bzip2 bzip2recover \
-+	rm -f $(OBJS) bzip2.o \
-+	libbz2.so.1.0.8 libbz2.so.1.0 libbz2.so.1 libbz2.so \
-+	libbz2.a bzip2 bzip2-shared bzip2recover \
- 	sample1.rb2 sample2.rb2 sample3.rb2 \
- 	sample1.tst sample2.tst sample3.tst
- 
- blocksort.o: blocksort.c
- 	@cat words0
--	$(CC) $(CFLAGS) -c blocksort.c
-+	$(CC) $(CFLAGS_NOPIC) -c blocksort.c
- huffman.o: huffman.c
--	$(CC) $(CFLAGS) -c huffman.c
-+	$(CC) $(CFLAGS_NOPIC) -c huffman.c
- crctable.o: crctable.c
--	$(CC) $(CFLAGS) -c crctable.c
-+	$(CC) $(CFLAGS_NOPIC) -c crctable.c
- randtable.o: randtable.c
--	$(CC) $(CFLAGS) -c randtable.c
-+	$(CC) $(CFLAGS_NOPIC) -c randtable.c
- compress.o: compress.c
--	$(CC) $(CFLAGS) -c compress.c
-+	$(CC) $(CFLAGS_NOPIC) -c compress.c
- decompress.o: decompress.c
--	$(CC) $(CFLAGS) -c decompress.c
-+	$(CC) $(CFLAGS_NOPIC) -c decompress.c
- bzlib.o: bzlib.c
--	$(CC) $(CFLAGS) -c bzlib.c
-+	$(CC) $(CFLAGS_NOPIC) -c bzlib.c
- bzip2.o: bzip2.c
--	$(CC) $(CFLAGS) -c bzip2.c
-+	$(CC) $(CFLAGS_NOPIC) -c bzip2.c
- bzip2recover.o: bzip2recover.c
--	$(CC) $(CFLAGS) -c bzip2recover.c
-+	$(CC) $(CFLAGS_NOPIC) -c bzip2recover.c
- 
- 
- distclean: clean
-@@ -189,7 +333,6 @@
- 	   $(DISTNAME)/bzmore.1 \
- 	   $(DISTNAME)/bzgrep \
- 	   $(DISTNAME)/bzgrep.1 \
--	   $(DISTNAME)/Makefile-libbz2_so \
- 	   $(DISTNAME)/bz-common.xsl \
- 	   $(DISTNAME)/bz-fo.xsl \
- 	   $(DISTNAME)/bz-html.xsl \
---- a/Makefile-libbz2_so
-+++ b/Makefile-libbz2_so
-@@ -1,59 +0,0 @@
--
--# This Makefile builds a shared version of the library, 
--# libbz2.so.1.0.8, with soname libbz2.so.1.0,
--# at least on x86-Linux (RedHat 7.2), 
--# with gcc-2.96 20000731 (Red Hat Linux 7.1 2.96-98).  
--# Please see the README file for some important info 
--# about building the library like this.
--
--# ------------------------------------------------------------------
--# This file is part of bzip2/libbzip2, a program and library for
--# lossless, block-sorting data compression.
--#
--# bzip2/libbzip2 version 1.0.8 of 13 July 2019
--# Copyright (C) 1996-2019 Julian Seward <jseward@acm.org>
--#
--# Please read the WARNING, DISCLAIMER and PATENTS sections in the 
--# README file.
--#
--# This program is released under the terms of the license contained
--# in the file LICENSE.
--# ------------------------------------------------------------------
--
--
--SHELL=/bin/sh
--CC=gcc
--BIGFILES=-D_FILE_OFFSET_BITS=64
--CFLAGS=-fpic -fPIC -Wall -Winline -O2 -g $(BIGFILES)
--
--OBJS= blocksort.o  \
--      huffman.o    \
--      crctable.o   \
--      randtable.o  \
--      compress.o   \
--      decompress.o \
--      bzlib.o
--
--all: $(OBJS)
--	$(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.8 $(OBJS)
--	$(CC) $(CFLAGS) -o bzip2-shared bzip2.c libbz2.so.1.0.8
--	rm -f libbz2.so.1.0
--	ln -s libbz2.so.1.0.8 libbz2.so.1.0
--
--clean: 
--	rm -f $(OBJS) bzip2.o libbz2.so.1.0.8 libbz2.so.1.0 bzip2-shared
--
--blocksort.o: blocksort.c
--	$(CC) $(CFLAGS) -c blocksort.c
--huffman.o: huffman.c
--	$(CC) $(CFLAGS) -c huffman.c
--crctable.o: crctable.c
--	$(CC) $(CFLAGS) -c crctable.c
--randtable.o: randtable.c
--	$(CC) $(CFLAGS) -c randtable.c
--compress.o: compress.c
--	$(CC) $(CFLAGS) -c compress.c
--decompress.o: decompress.c
--	$(CC) $(CFLAGS) -c decompress.c
--bzlib.o: bzlib.c
--	$(CC) $(CFLAGS) -c bzlib.c
---- a/unzcrash.c
-+++ b/unzcrash.c
-@@ -30,7 +30,7 @@
- 
- #include <stdio.h>
- #include <assert.h>
--#include "bzlib.h"
-+#include <bzlib.h>
- 
- #define M_BLOCK 1000000
- 
diff --git a/tools/bzip2/patches/100-cmake.patch b/tools/bzip2/patches/100-cmake.patch
new file mode 100644
index 0000000000..0ed37b2e44
--- /dev/null
+++ b/tools/bzip2/patches/100-cmake.patch
@@ -0,0 +1,382 @@
+--- /dev/null
++++ b/CMakeLists.txt
+@@ -0,0 +1,354 @@
++cmake_minimum_required(VERSION 3.12)
++
++project(bzip2
++        VERSION 1.0.8
++        DESCRIPTION "This Bzip2/libbz2 a program and library for lossless block-sorting data compression."
++        LANGUAGES C)
++
++# See versioning rule:
++#  http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
++#
++# KEEP THESE IN SYNC WITH meson.build OR STUFF WILL BREAK!
++set(LT_CURRENT  1)
++set(LT_REVISION 8)
++set(LT_AGE      0)
++
++set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
++
++include_directories(${PROJECT_BINARY_DIR})
++
++math(EXPR LT_SOVERSION "${LT_CURRENT} - ${LT_AGE}")
++set(LT_VERSION "${LT_SOVERSION}.${LT_AGE}.${LT_REVISION}")
++set(PACKAGE_VERSION ${PROJECT_VERSION})
++
++set(ENABLE_APP_DEFAULT ON)
++set(ENABLE_EXAMPLES_DEFAULT OFF)
++set(ENABLE_DOCS_DEFAULT OFF)
++include(CMakeOptions.txt)
++
++if(ENABLE_LIB_ONLY AND (ENABLE_APP OR ENABLE_EXAMPLES))
++    # Remember when disabled options are disabled for later diagnostics.
++    set(ENABLE_LIB_ONLY_DISABLED_OTHERS 1)
++else()
++    set(ENABLE_LIB_ONLY_DISABLED_OTHERS 0)
++endif()
++if(ENABLE_LIB_ONLY)
++    set(ENABLE_APP      OFF)
++    set(ENABLE_EXAMPLES OFF)
++endif()
++
++# Do not disable assertions based on CMAKE_BUILD_TYPE.
++foreach(_build_type Release MinSizeRel RelWithDebInfo)
++    foreach(_lang C)
++        string(TOUPPER CMAKE_${_lang}_FLAGS_${_build_type} _var)
++        string(REGEX REPLACE "(^|)[/-]D *NDEBUG($|)" " " ${_var} "${${_var}}")
++    endforeach()
++endforeach()
++
++# Support the latest c++ standard available.
++include(CheckCCompilerFlag)
++include(CheckCXXCompilerFlag)
++
++function(extract_valid_c_flags varname)
++  set(valid_flags)
++  foreach(flag IN LISTS ARGN)
++    string(REGEX REPLACE "[^a-zA-Z0-9_]+" "_" flag_var ${flag})
++    set(flag_var "C_FLAG_${flag_var}")
++    check_c_compiler_flag("${flag}" "${flag_var}")
++    if(${flag_var})
++      set(valid_flags "${valid_flags} ${flag}")
++    endif()
++  endforeach()
++  set(${varname} "${valid_flags}" PARENT_SCOPE)
++endfunction()
++if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
++    set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Choose the build type" FORCE)
++
++    # Include "None" as option to disable any additional (optimization) flags,
++    # relying on just CMAKE_C_FLAGS and CMAKE_CXX_FLAGS (which are empty by
++    # default). These strings are presented in cmake-gui.
++    set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
++        None Debug Release MinSizeRel RelWithDebInfo)
++endif()
++
++# Install a symlink of script to the "bin" directory.
++# Not intended for use on Windows.
++function(install_script_symlink original symlink)
++    add_custom_command(OUTPUT ${symlink}
++        COMMAND ${CMAKE_COMMAND} -E create_symlink ${original} ${symlink}
++        DEPENDS ${original}
++        COMMENT "Generating symbolic link ${symlink} of ${original}")
++    add_custom_target(${symlink}_tgt ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${symlink})
++    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${symlink} DESTINATION ${CMAKE_INSTALL_BINDIR})
++endfunction()
++
++# Install a symlink of binary target to the "bin" directory.
++# On Windows, it will be a copy instead of a symlink.
++function(install_target_symlink original symlink)
++    if(WIN32)
++        set(op copy)
++        set(symlink "${symlink}.exe")
++    else()
++        set(op create_symlink)
++    endif()
++    add_custom_command(TARGET ${original} POST_BUILD
++        COMMAND ${CMAKE_COMMAND} -E ${op} $<TARGET_FILE_NAME:${original}> ${symlink}
++        WORKING_DIRECTORY $<TARGET_FILE_DIR:${original}>
++        COMMENT "Generating symbolic link (or copy) ${symlink} of ${original}")
++    install(PROGRAMS $<TARGET_FILE_DIR:${original}>/${symlink} DESTINATION ${CMAKE_INSTALL_BINDIR})
++endfunction()
++
++include(GNUInstallDirs)
++
++# Checks for header files.
++include(CheckIncludeFile)
++check_include_file(arpa/inet.h    HAVE_ARPA_INET_H)
++check_include_file(fcntl.h        HAVE_FCNTL_H)
++check_include_file(inttypes.h     HAVE_INTTYPES_H)
++check_include_file(limits.h       HAVE_LIMITS_H)
++check_include_file(netdb.h        HAVE_NETDB_H)
++check_include_file(netinet/in.h   HAVE_NETINET_IN_H)
++check_include_file(pwd.h          HAVE_PWD_H)
++check_include_file(sys/socket.h   HAVE_SYS_SOCKET_H)
++check_include_file(sys/time.h     HAVE_SYS_TIME_H)
++check_include_file(syslog.h       HAVE_SYSLOG_H)
++check_include_file(time.h         HAVE_TIME_H)
++check_include_file(unistd.h       HAVE_UNISTD_H)
++
++include(CheckTypeSize)
++# Checks for typedefs, structures, and compiler characteristics.
++# AC_TYPE_SIZE_T
++check_type_size("ssize_t" SIZEOF_SSIZE_T)
++if(NOT SIZEOF_SSIZE_T)
++    # ssize_t is a signed type in POSIX storing at least -1.
++    # Set it to "int" to match the behavior of AC_TYPE_SSIZE_T (autotools).
++    set(ssize_t int)
++endif()
++
++include(CheckStructHasMember)
++check_struct_has_member("struct tm" tm_gmtoff time.h HAVE_STRUCT_TM_TM_GMTOFF)
++
++include(CheckSymbolExists)
++# XXX does this correctly detect initgroups (un)availability on cygwin?
++check_symbol_exists(initgroups grp.h HAVE_DECL_INITGROUPS)
++if(NOT HAVE_DECL_INITGROUPS AND HAVE_UNISTD_H)
++    # FreeBSD declares initgroups() in unistd.h
++    check_symbol_exists(initgroups unistd.h HAVE_DECL_INITGROUPS2)
++    if(HAVE_DECL_INITGROUPS2)
++        set(HAVE_DECL_INITGROUPS 1)
++    endif()
++endif()
++
++set(WARNCFLAGS)
++if(CMAKE_C_COMPILER_ID MATCHES "MSVC")
++    if(ENABLE_WERROR)
++        set(WARNCFLAGS    /WX)
++    endif()
++else()
++    if(ENABLE_WERROR)
++        extract_valid_c_flags(WARNCFLAGS    -Werror)
++    endif()
++
++    # For C compiler
++    # Please keep this list in sync with meson.build
++    extract_valid_c_flags(WARNCFLAGS
++        -Wall
++        -Wextra
++        -Wmissing-prototypes
++        -Wstrict-prototypes
++        -Wmissing-declarations
++        -Wpointer-arith
++        -Wdeclaration-after-statement
++        -Wformat-security
++        -Wwrite-strings
++        -Wshadow
++        -Winline
++        -Wnested-externs
++        -Wfloat-equal
++        -Wundef
++        -Wendif-labels
++        -Wempty-body
++        -Wcast-align
++        -Wclobbered
++        -Wvla
++        -Wpragmas
++        -Wunreachable-code
++        -Waddress
++        -Wattributes
++        -Wdiv-by-zero
++        -Wshorten-64-to-32
++        -Wconversion
++        -Wextended-offsetof
++        -Wformat-nonliteral
++        -Wlanguage-extension-token
++        -Wmissing-field-initializers
++        -Wmissing-noreturn
++        -Wmissing-variable-declarations
++        # -Wpadded                          # Not used because we cannot change public structs
++        -Wsign-conversion
++        # -Wswitch-enum                     # Not used because this basically disallows default case
++        -Wunreachable-code-break
++        -Wunused-macros
++        -Wunused-parameter
++        -Wredundant-decls
++        -Wheader-guard
++        -Wno-format-nonliteral              # This is required because we pass format string as "const char*.
++    )
++endif()
++
++if(ENABLE_DEBUG)
++    set(DEBUGBUILD 1)
++endif()
++
++#add_definitions(-DHAVE_CONFIG_H)
++#configure_file(cmakeconfig.h.in config.h)
++
++# autotools-compatible names
++# Sphinx expects relative paths in the .rst files. Use the fact that the files
++# below are all one directory level deep.
++file(RELATIVE_PATH top_srcdir   ${CMAKE_CURRENT_BINARY_DIR}/dir ${CMAKE_CURRENT_SOURCE_DIR})
++file(RELATIVE_PATH top_builddir ${CMAKE_CURRENT_BINARY_DIR}/dir ${CMAKE_CURRENT_BINARY_DIR})
++set(abs_top_srcdir   ${CMAKE_CURRENT_SOURCE_DIR})
++set(abs_top_builddir ${CMAKE_CURRENT_BINARY_DIR})
++# bzip2.pc (pkg-config file)
++set(prefix      ${CMAKE_INSTALL_PREFIX})
++set(exec_prefix ${CMAKE_INSTALL_PREFIX})
++set(bindir      ${CMAKE_INSTALL_FULL_BINDIR})
++set(sbindir     ${CMAKE_INSTALL_FULL_SBINDIR})
++set(libdir      ${CMAKE_INSTALL_FULL_LIBDIR})
++set(includedir  ${CMAKE_INSTALL_FULL_INCLUDEDIR})
++set(VERSION     ${PACKAGE_VERSION})
++
++#
++# The build targets.
++#   In a larger project, the following would be in subdirectories and
++#   These targets would be included with `add_subdirectory()`
++#
++set(BZ2_SOURCES
++    blocksort.c
++    huffman.c
++    crctable.c
++    randtable.c
++    compress.c
++    decompress.c
++    bzlib.c)
++
++# The bz2 OBJECT-library, required for bzip2, bzip2recover.
++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)
++
++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 ${CMAKE_CURRENT_SOURCE_DIR}/bzlib.h)
++    # Always use '-fPIC'/'-fPIE' option for shared libraries.
++    set_property(TARGET bz2 PROPERTY POSITION_INDEPENDENT_CODE ON)
++    set_target_properties(bz2 PROPERTIES
++        COMPILE_FLAGS "${WARNCFLAGS}"
++        VERSION ${LT_VERSION} SOVERSION ${LT_SOVERSION})
++    install(TARGETS bz2 DESTINATION ${CMAKE_INSTALL_LIBDIR})
++    install(FILES bzlib.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
++
++    if(USE_OLD_SONAME)
++        # Hack to support the old libbz2.so.1.0 version by including an extra copy.
++        # Technically the old SONAME is not libtool compatible.
++        # This hack is to support binary compatibility with libbz2 in some distro packages.
++        if(UNIX AND NOT APPLE)
++            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 ${CMAKE_CURRENT_SOURCE_DIR}/bzlib.h
++            )
++            set_target_properties(bz2_old_soname PROPERTIES
++                COMPILE_FLAGS "${WARNCFLAGS}"
++                VERSION ${LT_SOVERSION}.${LT_AGE} SOVERSION ${LT_SOVERSION}.${LT_AGE}
++                OUTPUT_NAME bz2
++            )
++            install(TARGETS bz2_old_soname DESTINATION ${CMAKE_INSTALL_LIBDIR})
++        endif()
++    endif()
++endif()
++
++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   ${CMAKE_CURRENT_SOURCE_DIR}/bzlib.h)
++    set_target_properties(bz2_static PROPERTIES
++        COMPILE_FLAGS       "${WARNCFLAGS}"
++        VERSION             ${LT_VERSION}
++        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(FILES bzlib.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
++endif()
++
++if(ENABLE_APP)
++    # The bzip2 executable.
++    add_executable(bzip2)
++    target_sources(bzip2
++        PRIVATE   bzip2.c)
++    target_link_libraries(bzip2
++        PRIVATE   bz2_ObjLib)
++    if(WIN32)
++        target_compile_definitions(bzip2 PUBLIC BZ_LCCWIN32 BZ_UNIX=0)
++    else()
++        target_compile_definitions(bzip2 PUBLIC BZ_LCCWIN32=0 BZ_UNIX)
++    endif()
++    install(TARGETS bzip2 DESTINATION ${CMAKE_INSTALL_BINDIR})
++
++    # Create bzip2 copies bzcat and bunzip.
++    # The default behavior is altered in bzip2.c code by checking the program name.
++    install_target_symlink(bzip2 bzcat)
++    install_target_symlink(bzip2 bunzip)
++
++    # The bzip2recover executable.
++    add_executable(bzip2recover)
++    target_sources(bzip2recover
++        PRIVATE   bzip2recover.c)
++    target_link_libraries(bzip2recover
++        PRIVATE bz2_ObjLib)
++    if(WIN32)
++        target_compile_definitions(bzip2recover PUBLIC BZ_LCCWIN32 BZ_UNIX=0)
++    else()
++        target_compile_definitions(bzip2recover PUBLIC BZ_LCCWIN32=0 BZ_UNIX)
++    endif()
++    install(TARGETS bzip2recover DESTINATION ${CMAKE_INSTALL_BINDIR})
++
++    if(ENABLE_EXAMPLES)
++        if(ENABLE_SHARED_LIB)
++            # The dlltest executable.
++            add_executable(dlltest)
++            target_sources(dlltest
++                PRIVATE   dlltest.c)
++            target_link_libraries(dlltest bz2)
++            install(TARGETS dlltest DESTINATION ${CMAKE_INSTALL_BINDIR})
++        endif()
++    endif()
++
++    if(NOT WIN32)
++        # Install shell scripts, and renamed copies.
++        install(PROGRAMS bzdiff bzgrep bzmore
++            DESTINATION ${CMAKE_INSTALL_BINDIR})
++
++        install_script_symlink(bzdiff bzcmp)
++
++        install_script_symlink(bzgrep bzegrep)
++        install_script_symlink(bzgrep bzfgrep)
++
++        install_script_symlink(bzmore bzless)
++    endif()
++
++endif()
+--- /dev/null
++++ b/CMakeOptions.txt
+@@ -0,0 +1,22 @@
++# Features that can be enabled for cmake (see CMakeLists.txt)
++
++option(ENABLE_WERROR     "Turn on compile time warnings")
++
++option(ENABLE_DEBUG      "Turn on debug output")
++
++option(ENABLE_APP        "Build applications (bzip2, and bzip2recover)"
++    ${ENABLE_APP_DEFAULT})
++
++option(ENABLE_DOCS       "Generate documentation"
++    ${ENABLE_DOCS_DEFAULT})
++
++option(ENABLE_EXAMPLES   "Build examples"
++    ${ENABLE_EXAMPLES_DEFAULT})
++
++option(ENABLE_LIB_ONLY   "Build libbz2 only.  This is a short hand for -DENABLE_APP=0 -DENABLE_EXAMPLES=0")
++
++option(ENABLE_STATIC_LIB "Build libbz2 in static mode also")
++
++option(ENABLE_SHARED_LIB "Build libbz2 as a shared library" ON)
++
++option(USE_OLD_SONAME "Use libbz2.so.1.0 for compatibility with old Makefiles" OFF)