[bsp/stm32/stm32f411-st-nucleo] add eclipse support.

bsp/stm32/stm32f411-st-nucleo/.project

+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+  <name>stm32f411-st-nucleo</name>
+  <comment />
+  <projects>
+	</projects>
+  <buildSpec>
+    <buildCommand>
+      <name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
+      <triggers>clean,full,incremental,</triggers>
+      <arguments>
+			</arguments>
+    </buildCommand>
+    <buildCommand>
+      <name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name>
+      <triggers>full,incremental,</triggers>
+      <arguments>
+			</arguments>
+    </buildCommand>
+  </buildSpec>
+  <natures>
+    <nature>org.eclipse.cdt.core.cnature</nature>
+    <nature>org.rt-thread.studio.rttnature</nature>
+    <nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
+    <nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
+  </natures>
+  <linkedResources>
+    <link>
+      <name>rt-thread</name>
+      <type>2</type>
+      <locationURI>virtual:/virtual</locationURI>
+    </link>
+    <link>
+      <name>rt-thread/bsp</name>
+      <type>2</type>
+      <locationURI>virtual:/virtual</locationURI>
+    </link>
+    <link>
+      <name>rt-thread/components</name>
+      <type>2</type>
+      <locationURI>$%7BPARENT-3-PROJECT_LOC%7D/components</locationURI>
+    </link>
+    <link>
+      <name>rt-thread/include</name>
+      <type>2</type>
+      <locationURI>$%7BPARENT-3-PROJECT_LOC%7D/include</locationURI>
+    </link>
+    <link>
+      <name>rt-thread/libcpu</name>
+      <type>2</type>
+      <locationURI>$%7BPARENT-3-PROJECT_LOC%7D/libcpu</locationURI>
+    </link>
+    <link>
+      <name>rt-thread/src</name>
+      <type>2</type>
+      <locationURI>$%7BPARENT-3-PROJECT_LOC%7D/src</locationURI>
+    </link>
+    <link>
+      <name>rt-thread/bsp/stm32</name>
+      <type>2</type>
+      <locationURI>virtual:/virtual</locationURI>
+    </link>
+    <link>
+      <name>rt-thread/bsp/stm32/libraries</name>
+      <type>2</type>
+      <locationURI>$%7BPARENT-1-PROJECT_LOC%7D/libraries</locationURI>
+    </link>
+  </linkedResources>
+</projectDescription>

bsp/stm32/stm32f411-st-nucleo/.settings/language.settings.xml

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<project>
+	<configuration id="ilg.gnuarmeclipse.managedbuild.cross.config.elf.debug.553091094" name="Debug">
+		<extension point="org.eclipse.cdt.core.LanguageSettingsProvider">
+			<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
+			<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
+			<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
+			<provider class="org.eclipse.cdt.managedbuilder.language.settings.providers.GCCBuiltinSpecsDetector" console="false" env-hash="-631187056492398907" id="ilg.gnuarmeclipse.managedbuild.cross.GCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT ARM Cross GCC Built-in Compiler Settings " parameter="${COMMAND} ${FLAGS} ${cross_toolchain_flags} -E -P -v -dD &quot;${INPUTS}&quot;" prefer-non-shared="true">
+				<language-scope id="org.eclipse.cdt.core.gcc"/>
+				<language-scope id="org.eclipse.cdt.core.g++"/>
+			</provider>
+		</extension>
+	</configuration>
+</project>

bsp/stm32/stm32f411-st-nucleo/.settings/org.eclipse.core.runtime.prefs

+content-types/enabled=true
+content-types/org.eclipse.cdt.core.asmSource/file-extensions=s
+eclipse.preferences.version=1

bsp/stm32/stm32f411-st-nucleo/makefile.targets

+clean2:
+	-$(RM) $(CC_DEPS)$(C++_DEPS)$(C_UPPER_DEPS)$(CXX_DEPS)$(SECONDARY_FLASH)$(SECONDARY_SIZE)$(ASM_DEPS)$(S_UPPER_DEPS)$(C_DEPS)$(CPP_DEPS)
+	-$(RM) $(OBJS) *.elf
+	-@echo ' '
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