Adjust cross-compilation flags to properly support FPGA signal sources

CMakeLists.txt

@@ -3348,6 +3348,12 @@ if(ENABLE_AD9361 OR ENABLE_FMCOMMS2)
     endif()
 endif()
 
+##############################################
+# Check FPGA-related signal sources
+##############################################
+if((ENABLE_AD9361 OR ENABLE_FPGA_MAX2771_EVKIT) AND NOT ENABLE_FPGA)
+    message(FATAL_ERROR "ENABLE_AD9361 and ENABLE_FPGA_MAX2771_EVKIT can only be set when ENABLE_FPGA is also set.")
+endif()
 
 
 ##############################################

src/algorithms/signal_source/adapters/CMakeLists.txt

@@ -167,7 +167,7 @@ target_include_directories(signal_source_adapters
         ${GNSSSDR_SOURCE_DIR}/src/core/interfaces
 )
 
-if(ENABLE_FPGA OR ENABLE_AD9361 OR ENABLE_FPGA_MAX2771_EVKIT)
+if(ENABLE_FPGA)
     target_link_libraries(signal_source_adapters
         PUBLIC
             signal_source_libs

src/algorithms/signal_source/libs/CMakeLists.txt

@@ -120,7 +120,7 @@ if(ENABLE_FMCOMMS2 OR ENABLE_AD9361 OR ENABLE_PLUTOSDR)
     endif()
 endif()
 
-if(ENABLE_FPGA OR ENABLE_AD9361)
+if(ENABLE_FPGA)
     target_link_libraries(signal_source_libs
         PUBLIC
             algorithms_libs

src/core/libs/CMakeLists.txt

@@ -52,7 +52,7 @@ if(ENABLE_FPGA)
     )
 endif()
 
-if(ENABLE_FPGA OR ENABLE_AD9361)
+if(ENABLE_FPGA)
     set(CORE_LIBS_SOURCES
         ${CORE_LIBS_SOURCES}
         uio_fpga.cc