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# Porcelain tools for using pkg config. Better than cmake's builtins.
# Execute pkg-config and store flags in the cache. Sets the variable `pkg_errno`
# in the parent scope to the return value of the subprocess call.
function(_pkg_query outvar arg)
execute_process(
COMMAND pkg-config --cflags-only-I ${arg}
RESULT_VARIABLE _pkg_err
OUTPUT_VARIABLE _pkg_out
OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
if(NOT _pkg_err EQUAL 0)
set(pkg_errno
1
PARENT_SCOPE)
return()
endif()
# Convert space-separated list to semicolon-separated cmake-list
string(REGEX REPLACE " +" ";" _includes_raw "${_pkg_out}")
set(PKG_${outvar}_INCLUDEDIRS_RAW
${_includes_raw}
CACHE STRING "include directories for ${outvar}" FORCE)
# Strip "-I" from include directories in the form of "-I/path/to"
string(REGEX REPLACE "-I" "" _include_list "${_includes_raw}")
set(PKG_${outvar}_INCLUDEDIRS
${_include_list}
CACHE STRING "include directories for ${outvar}" FORCE)
execute_process(
COMMAND pkg-config --cflags-only-other ${arg}
RESULT_VARIABLE _pkg_err
OUTPUT_VARIABLE _pkg_out
OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
if(NOT _pkg_err EQUAL 0)
set(pkg_errno
1
PARENT_SCOPE)
return()
endif()
# Convert space-separated list to semicolon-separated cmake-list
string(REGEX REPLACE " +" ";" _cflags_raw "${_pkg_out}")
set(PKG_${outvar}_CFLAGS_RAW
${_cflags}
CACHE STRING "cflags directories for ${outvar}" FORCE)
# Convert some C++ specific flags into a generator expression that will
# nullify during C compiles. Specifically match replace strings like
# "-std=c++11" to "$<$<COMPILE_LANGUAGE:CXX>:-std=c++11>".
string(REGEX REPLACE "(-std=[^;]+)" "$<$<COMPILE_LANGUAGE:CXX>:\\1>" _cflags
"${_cflags_raw}")
set(PKG_${outvar}_CFLAGS
${_cflags}
CACHE STRING "cflags for ${outvar}" FORCE)
set(PKG_${outvar}_CFLAGS_RAW
${_includes_raw} ${_cflags_raw}
CACHE STRING "raw cflags for ${outvar}" FORCE)
execute_process(
COMMAND pkg-config --libs-only-L ${arg}
RESULT_VARIABLE _pkg_err
OUTPUT_VARIABLE _pkg_out
OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
if(NOT _pkg_err EQUAL 0)
set(pkg_errno
1
PARENT_SCOPE)
return()
endif()
# Convert space-separated list to semicolon-separated cmake-list
string(REGEX REPLACE " +" ";" _libdirs_raw "${_pkg_out}")
# Remove -L prefix
string(REGEX REPLACE "-L" "" _libdirs "${_libdirs_raw}")
set(PKG_${outvar}_LIBDIRS
${_libdirs}
CACHE STRING "library directories for ${outvar}" FORCE)
execute_process(
COMMAND pkg-config --libs-only-l ${arg}
RESULT_VARIABLE _pkg_err
OUTPUT_VARIABLE _pkg_out
OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
if(NOT _pkg_err EQUAL 0)
set(pkg_errno
1
PARENT_SCOPE)
return()
endif()
# Convert space-separated list to semicolon-separated cmake-list
string(REGEX REPLACE " +" ";" _libs_raw "${_pkg_out}")
# Convert space-separated list to semicolon-separated cmake-list Strip "-l"
# from libraries in the form of "-lfilename" so that they are just "filename".
# Cmake will add the -l.
string(REGEX REPLACE "-l" "" _libs "${_libs_raw}")
set(PKG_${outvar}_LIBS
${_libs}
CACHE STRING "library directories for ${outvar}" FORCE)
message(STATUS "PKG_${outvar}_LIBS: ${PKG_${outvar}_LIBS}")
set(PKG_${outvar}_NAME
${arg}
CACHE STRING "selected name which worked as an argument to pkg-config"
FORCE)
set(PKG_${outvar}_LDFLAGS_RAW
${_libdirs_raw} ${_libs_raw}
CACHE STRING "raw ldflags for ${outvar}" FORCE)
set(pkg_errno
0
PARENT_SCOPE)
endfunction()
# Execute pkg-config for each name in the list Usage
# _pkg_query_loop(<canonical_name> [<alt1> [<alt2> [...]]])
function(_pkg_query_loop name)
if(PKG_${outvar}_FOUND)
return()
endif()
set(outvar ${name})
set(names ${ARGN})
if(NOT names)
set(names ${name})
endif()
set(pkg_errno 1)
foreach(qname ${names})
_pkg_query(${outvar} ${qname})
if(pkg_errno EQUAL 0)
set(PKG_${outvar}_FOUND
TRUE
CACHE BOOL "${outvar} was found" FORCE)
return()
endif()
endforeach()
set(PKG_${outvar}_FOUND
FALSE
CACHE BOOL "${outvar} was not found" FORCE)
endfunction()
# Find system packages using pkg-config.
#
# usage:
# ~~~
# pkg_find(PKG libfoo NAMES libfoo libfoo-1 libfoox
# PKG libbar NAMES libarx
# PKG libbaz)
# ~~~
#
# Execute pkg-config to get flags for each of the given library names. Each
# library is specified with a line `PKG <name> [NAMES <name0>, ...]`. If the
# library might have different names on different supported systems you may
# specify a list of names to attempt. The first one that `pkg-config` exists
# with `0` for will be used. If `NAMES` is provided, then `<name>` will not be
# attempted (so duplicate it if you want to). `<name>` will be used for the key
# in the pkg-config database cache.
function(pkg_find)
# cmake-lint: disable=C0201,R0912
set(state_ "PARSE_PKG")
set(name_)
set(names_)
foreach(arg ${ARGN})
if(state_ STREQUAL "PARSE_PKG")
if(arg STREQUAL "PKG")
set(state_ "PARSE_NAME")
set(name_)
set(names_)
else()
message(FATAL_ERROR "malformed pkg_find, "
"expected 'PKG' but got '${arg}'")
endif()
elseif(state_ STREQUAL "PARSE_NAME")
set(name_ ${arg})
set(state_ "PARSE_KEYWORD")
elseif(state_ STREQUAL "PARSE_KEYWORD")
if(arg STREQUAL "PKG")
_pkg_query_loop(${name_} ${names_})
set(name_)
set(names_)
set(state_ "PARSE_NAME")
elseif(arg STREQUAL "NAMES")
set(state_ "PARSE_NAMES")
else()
message(FATAL_ERROR "malformed pkg_find, expected keyword "
"'PKG' or 'NAMES' but got '${arg}'")
endif()
elseif(state_ STREQUAL "PARSE_NAMES")
if(arg STREQUAL "PKG")
_pkg_query_loop(${name_} ${names_})
set(name_)
set(names_)
set(state_ "PARSE_NAME")
elseif(arg STREQUAL "NAMES")
message(FATAL_ERROR "malformed pkg_find, found literal "
"'NAMES' when expecting library names")
else()
list(APPEND names_ ${arg})
endif()
endif()
endforeach()
if(name_)
_pkg_query_loop(${name_} ${names_})
endif()
endfunction()
# Add flags to compile/link options for the target according to the output of
# pkg-config. Asserts that the given pkg-config packages were found
function(target_pkg_depends target pkg0)
foreach(pkgname ${pkg0} ${ARGN})
if(NOT PKG_${pkgname}_FOUND)
message(FATAL_ERROR "pkg-config package ${pkgname} is not enumerated, but"
" required by ${target}")
endif()
if(NOT ${PKG_${pkgname}_FOUND})
message(FATAL_ERROR "pkg-config package ${pkgname} is not found, but"
" required by ${target}")
endif()
if(PKG_${pkgname}_INCLUDEDIRS)
# TODO(josh): passthrough things like SYSTEM, BEFORE,
# INTERFACE|PUBLIC|PRIVATE
target_include_directories(${target} SYSTEM
PUBLIC ${PKG_${pkgname}_INCLUDEDIRS})
endif()
if(PKG_${pkgname}_CFLAGS)
# TODO(josh): passthrough things like BEFORE, INTERFACE|PUBLIC|PRIVATE
target_compile_options(${target} PUBLIC ${PKG_${pkgname}_CFLAGS})
endif()
if(PKG_${pkgname}_LIBDIRS)
get_target_property(lflags_ ${target} LINK_FLAGS)
if(lflags_)
list(APPEND lflags_ ${PKG_${pkgname}_lflags})
set_target_properties(${target} PROPERTIES LINK_FLAGS ${lflags_})
else()
set_target_properties(${target} PROPERTIES LINK_FLAGS
${PKG_${pkgname}_lflags})
endif()
endif()
if(PKG_${pkgname}_LIBS)
# Passthrough options like INTERFACE|PUBLIC|PRIVATE and
# debug|optimized|general
target_link_libraries(${target} PUBLIC ${PKG_${pkgname}_LIBS})
endif()
endforeach()
endfunction()
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