cmake toolchains force cache cpu flags and don't append

 - these flags were accumlating on top of each other anytime cmake had to reconfigure

boards/atlflight/eagle/CMakeLists.txt

@@ -31,7 +31,7 @@
 #
 ############################################################################
 
-add_subdirectory(bbblue_adc)
+
 
 
 ############################################################################

platforms/nuttx/cmake/Platform/Generic-arm-none-eabi-gcc-cortex-m3.cmake

 
 set(cpu_flags "-mcpu=cortex-m3 -mthumb")
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${cpu_flags}")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${cpu_flags}")
-set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${cpu_flags} -D__ASSEMBLY__")
+set(CMAKE_C_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_ASM_FLAGS "${cpu_flags} -D__ASSEMBLY__" CACHE STRING "" FORCE)

platforms/nuttx/cmake/Platform/Generic-arm-none-eabi-gcc-cortex-m4.cmake

 
 set(cpu_flags "-mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard")
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${cpu_flags}")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${cpu_flags}")
-set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${cpu_flags} -D__ASSEMBLY__")
+set(CMAKE_C_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_ASM_FLAGS "${cpu_flags} -D__ASSEMBLY__" CACHE STRING "" FORCE)

platforms/nuttx/cmake/Platform/Generic-arm-none-eabi-gcc-cortex-m7.cmake

 
 set(cpu_flags "-mcpu=cortex-m7 -mthumb -mfpu=fpv5-d16 -mfloat-abi=hard")
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${cpu_flags}")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${cpu_flags}")
-set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${cpu_flags} -D__ASSEMBLY__")
+set(CMAKE_C_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_ASM_FLAGS "${cpu_flags} -D__ASSEMBLY__" CACHE STRING "" FORCE)

platforms/posix/cmake/Platform/Linux-arm-linux-gnueabihf-cortex-a53.cmake

 
 set(cpu_flags "-mcpu=cortex-a53 -mfpu=neon -mfloat-abi=hard")
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${cpu_flags}")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${cpu_flags}")
-set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${cpu_flags} -D__ASSEMBLY__")
+set(CMAKE_C_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_ASM_FLAGS "${cpu_flags} -D__ASSEMBLY__" CACHE STRING "" FORCE)

platforms/posix/cmake/Platform/Linux-arm-linux-gnueabihf-cortex-a8.cmake

 
 set(cpu_flags "-mcpu=cortex-a9 -mfpu=neon-vfpv3 -mfloat-abi=hard -mthumb-interwork")
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${cpu_flags}")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${cpu_flags}")
-set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${cpu_flags} -D__ASSEMBLY__")
+set(CMAKE_C_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_ASM_FLAGS "${cpu_flags} -D__ASSEMBLY__" CACHE STRING "" FORCE)

platforms/posix/cmake/Platform/Linux-arm-linux-gnueabihf-cortex-a9.cmake

 
 set(cpu_flags "-mcpu=cortex-a8 -mfpu=neon-vfpv3 -mfloat-abi=hard -mthumb-interwork")
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${cpu_flags}")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${cpu_flags}")
-set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${cpu_flags} -D__ASSEMBLY__")
+set(CMAKE_C_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "${cpu_flags}" CACHE STRING "" FORCE)
+set(CMAKE_ASM_FLAGS "${cpu_flags} -D__ASSEMBLY__" CACHE STRING "" FORCE)