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# Specify regular expression implementation
find_package(PCRE)
if(REGEX_BACKEND STREQUAL "")
check_symbol_exists(regcomp_l "regex.h;xlocale.h" HAVE_REGCOMP_L)
if(HAVE_REGCOMP_L)
set(REGEX_BACKEND "regcomp_l")
elseif(PCRE_FOUND)
set(REGEX_BACKEND "pcre")
else()
set(REGEX_BACKEND "builtin")
endif()
endif()
if(REGEX_BACKEND STREQUAL "regcomp_l")
add_feature_info(regex ON "using system regcomp_l")
set(GIT_REGEX_REGCOMP_L 1)
elseif(REGEX_BACKEND STREQUAL "pcre2")
find_package(PCRE2)
if(NOT PCRE2_FOUND)
MESSAGE(FATAL_ERROR "PCRE2 support was requested but not found")
endif()
add_feature_info(regex ON "using system PCRE2")
set(GIT_REGEX_PCRE2 1)
list(APPEND LIBGIT2_SYSTEM_INCLUDES ${PCRE2_INCLUDE_DIRS})
list(APPEND LIBGIT2_SYSTEM_LIBS ${PCRE2_LIBRARIES})
list(APPEND LIBGIT2_PC_REQUIRES "libpcre2-8")
elseif(REGEX_BACKEND STREQUAL "pcre")
add_feature_info(regex ON "using system PCRE")
set(GIT_REGEX_PCRE 1)
list(APPEND LIBGIT2_SYSTEM_INCLUDES ${PCRE_INCLUDE_DIRS})
list(APPEND LIBGIT2_SYSTEM_LIBS ${PCRE_LIBRARIES})
list(APPEND LIBGIT2_PC_REQUIRES "libpcre")
elseif(REGEX_BACKEND STREQUAL "regcomp")
add_feature_info(regex ON "using system regcomp")
set(GIT_REGEX_REGCOMP 1)
elseif(REGEX_BACKEND STREQUAL "builtin")
add_feature_info(regex ON "using bundled PCRE")
set(GIT_REGEX_BUILTIN 1)
add_subdirectory("${CMAKE_SOURCE_DIR}/deps/pcre" "${CMAKE_BINARY_DIR}/deps/pcre")
list(APPEND LIBGIT2_DEPENDENCY_INCLUDES "${CMAKE_SOURCE_DIR}/deps/pcre")
list(APPEND LIBGIT2_DEPENDENCY_OBJECTS $<TARGET_OBJECTS:pcre>)
else()
message(FATAL_ERROR "The REGEX_BACKEND option provided is not supported")
endif()
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