Basic libmad build

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.16)
-include(common.cmake)
+include($ENV{PROJ_PATH}/tools/cmake/common.cmake)
 
 set(SDKCONFIG_DEFAULTS "sdkconfig.common")
 
@@ -10,3 +10,4 @@ idf_build_set_property(COMPILE_OPTIONS "-DRESULT_DISABLE_EXCEPTIONS" APPEND)
 list(APPEND EXTRA_COMPONENT_DIRS "$ENV{PROJ_PATH}/src")
 
 project(gay-ipod-fw)
+include($ENV{PROJ_PATH}/tools/cmake/extra-libs.cmake)

test/CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.16)
-include(../common.cmake)
+include($ENV{PROJ_PATH}/tools/cmake/common.cmake)
 
 set(SDKCONFIG_DEFAULTS "../sdkconfig.common;sdkconfig.test")
 
@@ -18,3 +18,4 @@ list(APPEND EXTRA_COMPONENT_DIRS
 set(TEST_COMPONENTS "drivers")
 
 project(device_tests)
+include($ENV{PROJ_PATH}/tools/cmake/extra-libs.cmake)

tools/cmake/extra-libs.cmake

@@ -0,0 +1 @@
+include($ENV{PROJ_PATH}/tools/cmake/libmad.cmake)

tools/cmake/libmad.cmake

@@ -0,0 +1,19 @@
+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}")