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Use pcap-config if we have it.

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Also, provide support for linking statically with pcap.
This commit is contained in:
Guy Harris 2018-01-26 00:49:21 -08:00
parent 3e9e2b62b8
commit 213f7585eb
1 changed files with 88 additions and 7 deletions
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95
cmake/Modules/FindPCAP.cmake
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@ -2,11 +2,94 @@
# Try to find libpcap.
#
# Try to find the header
find_path(PCAP_INCLUDE_DIR pcap.h)
find_program(PCAP_CONFIG pcap-config)
if(PCAP_CONFIG)
# We have pcap-config; use it.
# First, get the include directory.
execute_process(COMMAND "${PCAP_CONFIG}" "--cflags"
RESULT_VARIABLE PCAP_CONFIG_RESULT
OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if(NOT PCAP_CONFIG_RESULT EQUAL 0)
message(FATAL_ERROR "pcap-config --cflags failed")
endif()
string(REGEX REPLACE "-I" "" PCAP_INCLUDE_DIR ${PCAP_CONFIG_OUTPUT})
# Try to find the library
find_library(PCAP_LIBRARY pcap)
# Now, get the library directories and libraries.
execute_process(COMMAND "${PCAP_CONFIG}" "--libs"
RESULT_VARIABLE PCAP_CONFIG_RESULT
OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if(NOT PCAP_CONFIG_RESULT EQUAL 0)
message(FATAL_ERROR "pcap-config --libs failed")
endif()
separate_arguments(LIBS_LIST UNIX_COMMAND ${PCAP_CONFIG_OUTPUT})
set(PCAP_LIBRARY_DIRS)
set(PCAP_LIBRARIES)
foreach(arg IN LISTS LIBS_LIST)
if(arg MATCHES "^-L")
# Add this directory to PCAP_LIBRARY_DIRS
string(REGEX REPLACE "-L" "" dir ${arg})
list(APPEND PCAP_LIBRARY_DIRS ${dir})
elseif(arg MATCHES "^-l")
string(REGEX REPLACE "-l" "" lib ${arg})
list(APPEND PCAP_LIBRARIES ${lib})
endif()
endforeach()
# Now, get the library directories and libraries for static linking.
execute_process(COMMAND "${PCAP_CONFIG}" "--libs" "--static"
RESULT_VARIABLE PCAP_CONFIG_RESULT
OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
)
if(NOT PCAP_CONFIG_RESULT EQUAL 0)
message(FATAL_ERROR "pcap-config --libs --static failed")
endif()
separate_arguments(LIBS_LIST UNIX_COMMAND ${PCAP_CONFIG_OUTPUT})
set(PCAP_STATIC_LIBRARY_DIRS)
set(PCAP_STATIC_LIBRARIES)
foreach(arg IN LISTS LIBS_LIST)
if(arg MATCHES "^-L")
# Add this directory to PCAP_STATIC_LIBRARY_DIRS
string(REGEX REPLACE "-L" "" dir ${arg})
list(APPEND PCAP_STATIC_LIBRARY_DIRS ${dir})
elseif(flag MATCHES "^-l")
string(REGEX REPLACE "-l" "" lib ${arg})
list(APPEND PCAP_STATIC_LIBRARIES ${lib})
endif()
endforeach()
# Try to find the header
find_path(PCAP_INCLUDE_DIR pcap.h HINTS ${PCAP_INCLUDE_DIRS})
# Try to find the library
find_library(PCAP_LIBRARY pcap HINTS ${PCAP_LIBRARY_DIRS})
# Try to find the static library (XXX - what about AIX?)
include(CMakePushCheckState)
cmake_push_check_state()
set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
find_library(PCAP_STATIC_LIBRARY pcap HINTS ${PCAP_STATIC_LIBRARY_DIRS})
cmake_pop_check_state()
else(PCAP_CONFIG)
# Try to find the header
find_path(PCAP_INCLUDE_DIR pcap.h)
# Try to find the library
find_library(PCAP_LIBRARY pcap)
# Try to find the static library (XXX - what about AIX?)
include(CMakePushCheckState)
cmake_push_check_state()
set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
find_library(PCAP_STATIC_LIBRARY pcap)
cmake_pop_check_state()
set(PCAP_INCLUDE_DIRS ${PCAP_INCLUDE_DIR})
set(PCAP_LIBRARIES ${PCAP_LIBRARY})
endif(PCAP_CONFIG)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(PCAP
@ -18,7 +101,5 @@ find_package_handle_standard_args(PCAP
mark_as_advanced(
PCAP_INCLUDE_DIR
PCAP_LIBRARY
PCAP_STATIC_LIBRARY
)
set(PCAP_INCLUDE_DIRS ${PCAP_INCLUDE_DIR})
set(PCAP_LIBRARIES ${PCAP_LIBRARY})