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@WestfW
Description
If you have a sketch in a directory whose name is different only in capitalization, the Arduino IDE will get confused about what type of file it is pre-processing.
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Download optiLoader .zip from https://github.com/WestfW/OptiLoader and uncompress.
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This gives you a directory OptiLoader-master, which the Arduino IDE won't like. Rename it to just "OptiLoader" - now the IDE will NOT complain about needing to "move" the sketch into a matching directory. (Note that the capitalization is still different.)
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Try to compile ("Verify") - the IDE will apparently attempt to do .cpp-style pre-processing on the optiLoader.h file, resulting in an error:
/Applications/arduino/Arduino-1.8.2.app/Contents/Java/arduino-builder -dump-prefs -logger=machine -hardware /Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware -hardware /Applications/arduino/Arduino-1.8.2.app/Contents/Java/portable/packages -tools /Applications/arduino/Arduino-1.8.2.app/Contents/Java/tools-builder -tools /Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr -tools /Applications/arduino/Arduino-1.8.2.app/Contents/Java/portable/packages -built-in-libraries /Applications/arduino/Arduino-1.8.2.app/Contents/Java/libraries -libraries /Applications/arduino/Arduino-1.8.2.app/Contents/Java/portable/sketchbook/libraries -fqbn=arduino:avr:uno -ide-version=10802 -build-path /var/folders/jz/5yb8f2hr8xjcpf0059bsfz4r0000gn/T/arduino_build_573999 -warnings=none -build-cache /var/folders/jz/5yb8f2hr8xjcpf0059bsfz4r0000gn/T/arduino_cache_401912 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avr-gcc.path=/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avrdude.path=/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.arduinoOTA.path=/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr -verbose /Volumes/Downloads/Downloads/OptiLoader/optiLoader.h
/Applications/arduino/Arduino-1.8.2.app/Contents/Java/arduino-builder -compile -logger=machine -hardware /Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware -hardware /Applications/arduino/Arduino-1.8.2.app/Contents/Java/portable/packages -tools /Applications/arduino/Arduino-1.8.2.app/Contents/Java/tools-builder -tools /Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr -tools /Applications/arduino/Arduino-1.8.2.app/Contents/Java/portable/packages -built-in-libraries /Applications/arduino/Arduino-1.8.2.app/Contents/Java/libraries -libraries /Applications/arduino/Arduino-1.8.2.app/Contents/Java/portable/sketchbook/libraries -fqbn=arduino:avr:uno -ide-version=10802 -build-path /var/folders/jz/5yb8f2hr8xjcpf0059bsfz4r0000gn/T/arduino_build_573999 -warnings=none -build-cache /var/folders/jz/5yb8f2hr8xjcpf0059bsfz4r0000gn/T/arduino_cache_401912 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avr-gcc.path=/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avrdude.path=/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.arduinoOTA.path=/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr -verbose /Volumes/Downloads/Downloads/OptiLoader/optiLoader.h
Using board 'uno' from platform in folder: /Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/arduino/avr
Using core 'arduino' from platform in folder: /Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/arduino/avr
Detecting libraries used...
"/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10802 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-I/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/arduino/avr/cores/arduino" "-I/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/arduino/avr/variants/standard" "/var/folders/jz/5yb8f2hr8xjcpf0059bsfz4r0000gn/T/arduino_build_573999/sketch/optiLoader.h.cpp" -o "/dev/null"
"/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10802 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-I/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/arduino/avr/cores/arduino" "-I/Applications/arduino/Arduino-1.8.2.app/Contents/Java/hardware/arduino/avr/variants/standard" "/var/folders/jz/5yb8f2hr8xjcpf0059bsfz4r0000gn/T/arduino_build_573999/sketch/optiLoader.h.cpp" -o "/var/folders/jz/5yb8f2hr8xjcpf0059bsfz4r0000gn/T/arduino_build_573999/preproc/ctags_target_for_gcc_minus_e.cpp"
/Volumes/Downloads/Downloads/OptiLoader/optiLoader.ino:85:24: fatal error: optiLoader.h: No such file or directory
#include "optiLoader.h"
Easiest fix is probably to fix the check where the IDE (incorrectly) thinks that the sketch name and directory name match...