tools/ci.sh: Build Xtensa natmods as part of the CI process.

This commit expands the CI tests by checking whether the example native
modules are able to be built for the Xtensa architecture.

This was made possible by the changes to mpy_ld that allow symbol
resolution across standard compiler-provided libraries.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

Author: agatti

tools/ci.sh

@@ -197,7 +197,7 @@ function ci_esp32_build_s3_c3 {
 # ports/esp8266
 
 function ci_esp8266_setup {
-    sudo pip install pyserial esptool==3.3.1
+    sudo pip3 install pyserial esptool==3.3.1 pyelftools ar
     wget https://github.com/jepler/esp-open-sdk/releases/download/2018-06-10/xtensa-lx106-elf-standalone.tar.gz
     zcat xtensa-lx106-elf-standalone.tar.gz | tar x
     # Remove this esptool.py so pip version is used instead
@@ -214,6 +214,9 @@ function ci_esp8266_build {
     make ${MAKEOPTS} -C ports/esp8266 BOARD=ESP8266_GENERIC
     make ${MAKEOPTS} -C ports/esp8266 BOARD=ESP8266_GENERIC BOARD_VARIANT=FLASH_512K
     make ${MAKEOPTS} -C ports/esp8266 BOARD=ESP8266_GENERIC BOARD_VARIANT=FLASH_1M
+
+    # Test building native .mpy with xtensa architecture.
+    ci_native_mpy_modules_build xtensa
 }
 
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