Fix for OpenSUSE/leap

CMakeLists.txt

@@ -371,7 +371,10 @@ if(CMAKE_VERSION VERSION_LESS "3.4")
     set(GNSSSDR_PUGIXML_LOCAL_VERSION "1.10")
 endif()
 
-if(CMAKE_CROSSCOMPILING OR CMAKE_VERSION VERSION_LESS "3.13")
+if(CMAKE_CROSSCOMPILING OR CMAKE_VERSION VERSION_LESS "3.13" OR
+  ((CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0.0)) OR
+  ((CMAKE_CXX_COMPILER_ID STREQUAL "Clang") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "9.0")) OR
+  ((CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "11")))
     set(GNSSSDR_PROTOCOLBUFFERS_LOCAL_VERSION "21.12")
 endif()
 
@@ -2536,7 +2539,13 @@ endif()
 ################################################################################
 # Protocol Buffers https://github.com/protocolbuffers/protobuf
 ################################################################################
-find_package(Protobuf)
+if(((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.0.0")) OR
+  ((CMAKE_CXX_COMPILER_ID STREQUAL "Clang") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "9.0")) OR
+  ((CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "11")))
+    find_package(Protobuf 21.12 EXACT)
+else()
+    find_package(Protobuf)
+endif()
 set_package_properties(Protobuf PROPERTIES
     URL "https://protobuf.dev/"
     PURPOSE "Used to serialize output data in a way that can be read by other applications."
@@ -2622,7 +2631,7 @@ if(Protobuf_FOUND AND CMAKE_CROSSCOMPILING)
     endif()
 endif()
 
-if((NOT Protobuf_FOUND) OR (NOT Protobuf_PROTOC_EXECUTABLE) OR (${Protobuf_VERSION} VERSION_LESS ${GNSSSDR_PROTOBUF_MIN_VERSION}))
+if((NOT Protobuf_FOUND) OR (NOT Protobuf_PROTOC_EXECUTABLE) OR (${Protobuf_VERSION} VERSION_LESS ${GNSSSDR_PROTOBUF_MIN_VERSION}) OR ((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.0.0")))
     unset(Protobuf_PROTOC_EXECUTABLE)
     if(CMAKE_CROSSCOMPILING)
         if(NOT Protobuf_FOUND)
@@ -2660,6 +2669,10 @@ if((NOT Protobuf_FOUND) OR (NOT Protobuf_PROTOC_EXECUTABLE) OR (${Protobuf_VERSI
                     set(absl_FOUND OFF)
                 endif()
             endif()
+            if((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.0.0"))
+                unset(absl_FOUND CACHE)
+                set(absl_FOUND OFF)
+            endif()
             if(absl_FOUND)
                 set_package_properties(absl PROPERTIES
                     DESCRIPTION "An open-source collection of C++ code designed to augment the C++ standard library (found: v${absl_VERSION})"
@@ -2674,7 +2687,9 @@ if((NOT Protobuf_FOUND) OR (NOT Protobuf_PROTOC_EXECUTABLE) OR (${Protobuf_VERSI
                         DESCRIPTION "An open-source collection of C++ code designed to augment the C++ standard library"
                     )
                 endif()
-                message(STATUS "The Abseil library (https://github.com/abseil/abseil-cpp) >= v20230117 is required to be installed before building Protocol Buffers >22.x on the fly.")
+                if(NOT (CMAKE_CXX_COMPILER_ID STREQUAL "GNU") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.0.0"))
+                    message(STATUS "The Abseil library (https://github.com/abseil/abseil-cpp) >= v20230117 is required to be installed before building Protocol Buffers >22.x on the fly.")
+                endif()
                 message(STATUS " Instead, Protocol Buffers v21.12 will be built, which does not require Abseil.")
                 set(GNSSSDR_PROTOCOLBUFFERS_LOCAL_VERSION "21.12")
             endif()
@@ -2787,8 +2802,8 @@ if((NOT Protobuf_FOUND) OR (NOT Protobuf_PROTOC_EXECUTABLE) OR (${Protobuf_VERSI
 
             if(NOT TARGET protobuf::protoc)
                 add_executable(protobuf::protoc IMPORTED)
-                add_dependencies(protobuf::protoc protobuf-${GNSSSDR_PROTOCOLBUFFERS_LOCAL_VERSION})
             endif()
+            add_dependencies(protobuf::protoc protobuf-${GNSSSDR_PROTOCOLBUFFERS_LOCAL_VERSION})
             unset(Protobuf_PROTOC_EXECUTABLE)
             set(PROTOBUF_PROTOC_EXECUTABLE "${GNSSSDR_BINARY_DIR}/protobuf-${GNSSSDR_PROTOCOLBUFFERS_LOCAL_VERSION}/bin/protoc")
             set_target_properties(protobuf::protoc PROPERTIES

README.md

@@ -278,7 +278,7 @@ $ zypper install cmake git gcc-c++ boost-devel libboost_atomic-devel \
        libboost_system-devel libboost_filesystem-devel libboost_chrono-devel \
        libboost_thread-devel libboost_serialization-devel log4cpp-devel \
        gnuradio-devel pugixml-devel libpcap-devel armadillo-devel libtool \
-       automake hdf5-devel openssl-devel python3-Mako protobuf-devel
+       automake hdf5-devel openssl-devel python3-Mako libmatio-devel
 ```
 
 If you are using openSUSE Tumbleweed: