Describe the problem

The previous file persists in the sketch build folder after a sketch code file with extension other than .ino/.pde is renamed.

🐛 This can result in spurious compilation errors or confusing bugs. Arduino CLI users can work around the bug by adding the --clean flag to their command, but the only workaround for Arduino IDE users is to manually clean the build folder.

To reproduce

$ arduino-cli version

arduino-cli.exe  Version: git-snapshot Commit: a735ddfd Date: 2023-01-15T01:00:07Z

$ arduino-cli sketch new /tmp/FooSketch

$ echo "void asdf() {}" > /tmp/FooSketch/foo.cpp

$ arduino-cli compile --fqbn arduino:avr:uno /tmp/FooSketch

[...]

$ mv /tmp/FooSketch/foo.cpp /tmp/FooSketch/bar.cpp

$ arduino-cli compile --fqbn arduino:avr:uno /tmp/FooSketch

C:\Users\per\AppData\Local\Temp\arduino\sketch-2405C4C9F90028537C79B0744BCE536E\sketch\foo.cpp.o (symbol from plugin): In function `asdf()':
(.text+0x0): multiple definition of `asdf()'
C:\Users\per\AppData\Local\Temp\arduino\sketch-2405C4C9F90028537C79B0744BCE536E\sketch\bar.cpp.o (symbol from plugin):(.text+0x0): first defined here
collect2.exe: error: ld returned 1 exit status

Used platform Version Path
arduino:avr   1.8.6   C:\Users\per\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6

Error during build: exit status 1

$ ls "C:/Users/per/AppData/Local/Temp/arduino/sketch-2405C4C9F90028537C79B0744BCE536E/sketch"

bar.cpp  bar.cpp.d  bar.cpp.o  foo.cpp  foo.cpp.d  foo.cpp.o  FooSketch.ino.cpp  FooSketch.ino.cpp.d  FooSketch.ino.cpp.o

🐛 foo.cpp is still present in the build folder even though not present in the sketch. foo.cpp is compiled in addition to bar.cpp and the primary sketch file.

Expected behavior

Files are always removed from the sketch build folder when no longer present in the sketch.

Arduino CLI version

Original report

Arduino IDE 1.6.9

Last verified with

0.34.1

Operating system

• Linux
• Windows

Operating system version

• Mint
• 10

Additional context

Workaround

Arduino CLI users

Run an arduino-cli compile command with the --clean flag.

Arduino IDE users

1. Examine the compiler error message. It will show the path of the temporary build folder.
   For example, in this error:

   C:\Users\per\AppData\Local\Temp\arduino\sketches\7930E8409AED6D4F4A4782CF985194E9\sketch\foo.cpp.o (symbol from plugin): In function `asdf()':
   (.text+0x0): multiple definition of `asdf()'
   C:\Users\per\AppData\Local\Temp\arduino\sketches\7930E8409AED6D4F4A4782CF985194E9\sketch\bar.cpp.o (symbol from plugin):(.text+0x0): first defined here
   collect2.exe: error: ld returned 1 exit status
   
   exit status 1
   
   Compilation error: exit status 1
   

   The temporary build folder is:

   C:\Users\per\AppData\Local\Temp\arduino\sketches\7930E8409AED6D4F4A4782CF985194E9\sketch\
   

2. Delete the temporary build folder.

Additional reports

• Sketch source move to build folder bug: file extension changing #1699
• Rename of .h and .cpp files does not work #2058
• changing the name of src directory, don't change compilator cache #2613
• Renaming Tab after sucessful build causes build failure #2870
• Renaming a tab does not remove the file from build cache arduino-ide#970
• File are not renamed when renaming tab arduino-ide#1316
• Code would not compile/link without errors, copy of code compiled/linked without errors arduino-ide#1691
• Renaming files results in bogus compile errors (cache not properly cleared) arduino-ide#2323
• Incorrect handling of changed case of sketch file name arduino-ide#482 (comment)
• Deleted header files remain includable Arduino#2072
• https://forum.arduino.cc/t/ide-and-compiler-clear/1077526
• https://forum.arduino.cc/t/changed-tab-name-in-sketch-still-linking-old-o-file/1046286
• https://forum.arduino.cc/t/weird-error-pointing-to-old-code/1113608
• https://forum.arduino.cc/t/ide2-bit-upset-need-help/1129513
• https://forum.arduino.cc/t/renamed-tabs-wont-go-away/1165338
• https://forum.arduino.cc/t/file-renaming-issue/1173234/6
• https://forum.arduino.cc/t/reorganizing-code-w-wire-h-library/1180211
• https://forum.arduino.cc/t/ide-not-recognising-file-type-change-from-c-to-cpp/1215993
• https://forum.arduino.cc/t/code-compiles-in-old-ide-but-not-the-new-one/1286767
• https://forum.arduino.cc/t/problem-while-defining-namespaces-with-it-own-cpp-and-hpp-files/1304403
• https://forum.arduino.cc/t/there-is-a-bug-in-the-wire-library-for-version-1-8-6-avr-boards/1336297/18
• https://forum.arduino.cc/t/new-version-of-arduino-ide-2-3-5-error/1371224/20
• https://forum.arduino.cc/t/how-to-clear-cache-from-ide/1374114

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest nightly build
• My report contains all necessary details