Basic libmad build

tools/cmake/common.cmake

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+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Build only the subset of components that we actually depend on.
+set(COMPONENTS "")
+
+# External dependencies
+list(APPEND EXTRA_COMPONENT_DIRS "$ENV{PROJ_PATH}/lib/result")
+list(APPEND EXTRA_COMPONENT_DIRS "$ENV{PROJ_PATH}/lib/lvgl")
+list(APPEND EXTRA_COMPONENT_DIRS "$ENV{PROJ_PATH}/lib/catch2")
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+# Additional warnings used when compiling our components.
+# Unable to be used due to issues in ESP-IDF includes are: -Wpedantic
+# -Wuseless-cast -Wconversion -Wold-style-cast -Wsign-conversion -Wcast-align
+set(EXTRA_WARNINGS "-Wshadow" "-Wnon-virtual-dtor" "-Wunused"
+  "-Woverloaded-virtual" "-Wmisleading-indentation" "-Wduplicated-cond"
+  "-Wduplicated-branches" "-Wlogical-op" "-Wnull-dereference"
+  "-Wdouble-promotion" "-Wformat=2" "-Wimplicit-fallthrough")
+
+# Extra build flags that should apply to the entire build. This should mostly
+# just be used to setting flags that our external dependencies requires.
+# Otherwise, prefer adding per-component build flags to keep things neat.
+idf_build_set_property(COMPILE_OPTIONS "-DLV_CONF_INCLUDE_SIMPLE" APPEND)

tools/cmake/extra-libs.cmake

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+include($ENV{PROJ_PATH}/tools/cmake/libmad.cmake)

tools/cmake/libmad.cmake

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+set(LIBMAD_SRC "$ENV{PROJ_PATH}/lib/libmad")
+set(LIBMAD_BIN "${CMAKE_CURRENT_BINARY_DIR}/libmad")
+
+externalproject_add(libmad_build
+  SOURCE_DIR "${LIBMAD_SRC}"
+  PREFIX "${LIBMAD_BIN}"
+  CONFIGURE_COMMAND ${LIBMAD_SRC}/configure CC=${CMAKE_C_COMPILER} --srcdir=${LIBMAD_SRC} --prefix=${LIBMAD_BIN} --host=xtensa-elf --disable-debugging --disable-shared
+  BUILD_COMMAND "make"
+  INSTALL_COMMAND "make install"
+  BUILD_BYPRODUCTS "${LIBMAD_BIN}/libmad.a"
+)
+
+ add_library(libmad STATIC IMPORTED GLOBAL)
+ add_dependencies(libmad libmad_build)
+
+ set_target_properties(libmad PROPERTIES IMPORTED_LOCATION
+   "${LIBMAD_BIN}/libmad.a")
+ set_target_properties(libmad PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
+   "${LIBMAD_BIN}")