set (re2_sources
	./re2/tostring.cc
	./re2/dfa.cc
	./re2/prefilter.cc
	./re2/compile.cc
	./re2/regexp.cc
	./re2/onepass.cc
	./re2/prefilter_tree.cc
	./re2/set.cc
	./re2/filtered_re2.cc
	./re2/perl_groups.cc
	./re2/parse.cc
	./re2/nfa.cc
	./re2/bitstate.cc
	./re2/simplify.cc
	./re2/unicode_groups.cc
	./re2/mimics_pcre.cc
	./re2/re2.cc
	./re2/prog.cc
	./re2/unicode_casefold.cc
	./util/strutil.cc
	./util/stringpiece.cc
	./util/hash.cc
	./util/arena.cc
	./util/valgrind.cc
	./util/pcre.cc
	./util/stringprintf.cc
	./util/rune.cc
	./util/random.cc
	./util/thread.cc
)

# Building re2 which is thread-safe and re2_st which is not.
# re2 changes its state during matching of regular expression, e.g. creates temporary DFA.
# It uses RWLock to process the same regular expression object from different threads.
# In order to avoid redundant locks in some cases, we use not thread-safe version of the library (re2_st).

add_library (re2 ${re2_sources})
add_library (re2_st ${re2_sources})

target_compile_definitions (re2 PRIVATE NDEBUG)
target_compile_definitions (re2_st PRIVATE NDEBUG NO_THREADS re2=re2_st)

target_include_directories (re2 PUBLIC .)
target_include_directories (re2_st PUBLIC .)

file (MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/re2_st)
foreach (FILENAME filtered_re2.h re2.h set.h stringpiece.h variadic_function.h)
	add_custom_command (OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/re2_st/${FILENAME}"
		COMMAND ${CMAKE_COMMAND} -DSOURCE_FILENAME="${CMAKE_CURRENT_SOURCE_DIR}/re2/${FILENAME}"
					-DTARGET_FILENAME="${CMAKE_CURRENT_BINARY_DIR}/re2_st/${FILENAME}"
					-P "${CMAKE_CURRENT_SOURCE_DIR}/re2_transform.cmake"
		COMMENT "Creating ${FILENAME} for re2_st library.")
	add_custom_target (transform_${FILENAME} DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/re2_st/${FILENAME}")
	add_dependencies (re2_st transform_${FILENAME})
endforeach ()