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[CMake] Add gRPC_USE_SYSTEMD option (#34384) 

Issue https://github.com/grpc/grpc/issues/34304

Allows to disable systemd support,
as well as linking with libsystemd,
when it is not required.

The option has three possible values:
AUTO - Default, Will try to find libsystemd. If found, systemd support will be enabled.
ON - Enable systemd support. Build will fail if libsystemd is not found.
OFF - Disable systemd support.

Closes #34384

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/34384 from kirpichik:cmake-use-systemd-option 96f5f4bd68
PiperOrigin-RevId: 621274356
This commit is contained in:
Kirill 2024-04-02 13:17:47 -07:00 committed by Copybara-Service
parent aa3b659e48
commit 5c3400e8dc
1 changed files with 16 additions and 5 deletions
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21
cmake/systemd.cmake
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@ -12,9 +12,20 @@
# See the License for the specific language governing permissions and
# limitations under the License.
find_package(systemd)
if(TARGET systemd)
set(_gRPC_SYSTEMD_LIBRARIES systemd ${SYSTEMD_LINK_LIBRARIES})
add_definitions(-DHAVE_LIBSYSTEMD)
set(gRPC_USE_SYSTEMD "AUTO" CACHE STRING "Build with libsystemd support if available. Can be ON, OFF or AUTO")
if (NOT gRPC_USE_SYSTEMD STREQUAL "OFF")
if (gRPC_USE_SYSTEMD STREQUAL "ON")
find_package(systemd REQUIRED)
elseif (gRPC_USE_SYSTEMD STREQUAL "AUTO")
find_package(systemd)
else()
message(FATAL_ERROR "Unknown value for gRPC_USE_SYSTEMD = ${gRPC_USE_SYSTEMD}")
endif()
if(TARGET systemd)
set(_gRPC_SYSTEMD_LIBRARIES systemd ${SYSTEMD_LINK_LIBRARIES})
add_definitions(-DHAVE_LIBSYSTEMD)
endif()
set(_gRPC_FIND_SYSTEMD "if(NOT systemd_FOUND)\n find_package(systemd)\nendif()")
endif()
set(_gRPC_FIND_SYSTEMD "if(NOT systemd_FOUND)\n find_package(systemd)\nendif()")