Add ESP-IDF component files

CMakeLists.txt

@@ -0,0 +1,28 @@
+idf_component_register(
+  SRCS
+    "common/adaint.c"
+    "common/freertos_bindings.c"
+    "common/last_chance_handler.c"
+    "common/vApplicationStackOverflowHook.c"
+  REQUIRES freertos)
+
+idf_component_get_property(FREERTOS_ORIG_INCLUDE_PATH freertos
+                           ORIG_INCLUDE_PATH)
+
+target_include_directories (${COMPONENT_LIB} PRIVATE
+  ${FREERTOS_ORIG_INCLUDE_PATH})
+
+# Build GNAT RTS in ${BUILD_DIR}/rts
+add_custom_command(OUTPUT ${BUILD_DIR}/rts/adalib/libgnat.a
+     COMMAND gprbuild -p -P ${COMPONENT_DIR}/esp32/build_runtime.gpr
+               --db ${COMPONENT_DIR}/gprconfig
+               --autoconf=${BUILD_DIR}/config.cgpr
+          && gprinstall -p -P ${COMPONENT_DIR}/esp32/build_runtime.gpr
+               --prefix=${BUILD_DIR}/rts
+               --autoconf=${BUILD_DIR}/config.cgpr
+     DEPENDS ${COMPONENT_DIR}/common/ ${COMPONENT_DIR}/esp32/adainclude/
+     VERBATIM)
+
+add_custom_target(gnat DEPENDS ${BUILD_DIR}/rts/adalib/libgnat.a)
+add_dependencies(${COMPONENT_LIB} gnat)
+target_link_libraries(${COMPONENT_LIB} ${BUILD_DIR}/rts/adalib/libgnat.a)

gprconfig/linker-esp32.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" ?>
+<gprconfig>
+  <configuration>
+    <targets>
+      <target name=".*-elf$" />
+    </targets>
+    <config>
+   for Archive_Builder  use ("${TARGET}-ar", "cr");
+   for Archive_Builder_Append_Option use ("q");
+   for Archive_Indexer  use ("${TARGET}-ranlib");
+   for Archive_Suffix   use ".a";
+   for Library_Support  use "static_only";
+   for Library_Builder  use "${GPRCONFIG_PREFIX}libexec/gprbuild/gprlib";
+    </config>
+  </configuration>
+
+</gprconfig>