Explicitly target the ESP32 during binary comparison

When using binutils-gdb (esp32ulp) to generate the "reference binary",
which we compare against, pass --mcpu=esp32 to select the original
ESP32 variant. While this is the default target of esp32-ulp-as,
adding this argument makes the choice explicit and shows how to select
a variant, for when we add support the ESP32-S2 or ESP32-S3 (both
use --mcpu=esp32s2 because their ULPs have the same binary format).

Author: wnienhaus

tests/01_compat_tests.sh

@@ -26,7 +26,7 @@ for src_file in $(ls -1 compat/*.S); do
 
     echo -e "\tBuilding using binutils"
     gcc -E -o ${pre_file} $src_file
-    esp32ulp-elf-as -o $obj_file ${pre_file}
+    esp32ulp-elf-as --mcpu=esp32 -o $obj_file ${pre_file}
     esp32ulp-elf-ld -T esp32.ulp.ld -o $elf_file $obj_file
     esp32ulp-elf-objcopy -O binary $elf_file $bin_file
 

tests/02_compat_rtc_tests.sh

@@ -141,7 +141,7 @@ for src_file in ulptool/src/ulp_examples/*/*.s binutils-gdb/gas/testsuite/gas/es
     gcc -I esp-idf/components/soc/esp32/include -I esp-idf/components/esp_common/include \
         -x assembler-with-cpp \
         -E -o ${pre_file} $src_file
-    esp32ulp-elf-as -o $obj_file ${pre_file}
+    esp32ulp-elf-as --mcpu=esp32 -o $obj_file ${pre_file}
     esp32ulp-elf-ld -T esp32.ulp.ld -o $elf_file $obj_file
     esp32ulp-elf-objcopy -O binary $elf_file $bin_file