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ARROW-15782: [C++] Fix Findre2Alt.cmake to check RE2_ROOT variable first #12513

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ARROW-15782: [C++] Fix Findre2Alt.cmake to check RE2_ROOT variable first #12513

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64 changes: 33 additions & 31 deletions cpp/cmake_modules/Findre2Alt.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -28,28 +28,7 @@ if(re2_FOUND)
return()
endif()

find_package(PkgConfig QUIET)
pkg_check_modules(RE2_PC re2)
if(RE2_PC_FOUND)
set(RE2_INCLUDE_DIR "${RE2_PC_INCLUDEDIR}")

list(APPEND RE2_PC_LIBRARY_DIRS "${RE2_PC_LIBDIR}")
find_library(RE2_LIB re2
PATHS ${RE2_PC_LIBRARY_DIRS}
PATH_SUFFIXES ${ARROW_LIBRARY_PATH_SUFFIXES}
NO_DEFAULT_PATH)

# On Fedora, the reported prefix is wrong. As users likely run into this,
# workaround.
# https://bugzilla.redhat.com/show_bug.cgi?id=1652589
if(UNIX
AND NOT APPLE
AND NOT RE2_LIB)
if(RE2_PC_PREFIX STREQUAL "/usr/local")
find_library(RE2_LIB re2)
endif()
endif()
elseif(RE2_ROOT)
if(RE2_ROOT)
find_library(RE2_LIB
NAMES re2_static
re2
Expand All @@ -64,15 +43,38 @@ elseif(RE2_ROOT)
NO_DEFAULT_PATH
PATH_SUFFIXES ${ARROW_INCLUDE_PATH_SUFFIXES})
else()
find_library(RE2_LIB
NAMES re2_static
re2
"${CMAKE_STATIC_LIBRARY_PREFIX}re2${RE2_MSVC_STATIC_LIB_SUFFIX}${CMAKE_STATIC_LIBRARY_SUFFIX}"
"${CMAKE_SHARED_LIBRARY_PREFIX}re2${CMAKE_SHARED_LIBRARY_SUFFIX}"
PATH_SUFFIXES ${ARROW_LIBRARY_PATH_SUFFIXES})
find_path(RE2_INCLUDE_DIR
NAMES re2/re2.h
PATH_SUFFIXES ${ARROW_INCLUDE_PATH_SUFFIXES})
find_package(PkgConfig QUIET)
pkg_check_modules(RE2_PC re2)
if(RE2_PC_FOUND)
set(RE2_INCLUDE_DIR "${RE2_PC_INCLUDEDIR}")

list(APPEND RE2_PC_LIBRARY_DIRS "${RE2_PC_LIBDIR}")
find_library(RE2_LIB re2
PATHS ${RE2_PC_LIBRARY_DIRS}
PATH_SUFFIXES ${ARROW_LIBRARY_PATH_SUFFIXES}
NO_DEFAULT_PATH)

# On Fedora, the reported prefix is wrong. As users likely run into this,
# workaround.
# https://bugzilla.redhat.com/show_bug.cgi?id=1652589
if(UNIX
AND NOT APPLE
AND NOT RE2_LIB)
if(RE2_PC_PREFIX STREQUAL "/usr/local")
find_library(RE2_LIB re2)
endif()
endif()
else()
find_library(RE2_LIB
NAMES re2_static
re2
"${CMAKE_STATIC_LIBRARY_PREFIX}re2${RE2_MSVC_STATIC_LIB_SUFFIX}${CMAKE_STATIC_LIBRARY_SUFFIX}"
"${CMAKE_SHARED_LIBRARY_PREFIX}re2${CMAKE_SHARED_LIBRARY_SUFFIX}"
PATH_SUFFIXES ${ARROW_LIBRARY_PATH_SUFFIXES})
find_path(RE2_INCLUDE_DIR
NAMES re2/re2.h
PATH_SUFFIXES ${ARROW_INCLUDE_PATH_SUFFIXES})
endif()
endif()

find_package_handle_standard_args(re2Alt REQUIRED_VARS RE2_LIB RE2_INCLUDE_DIR)
Expand Down