Multiple libraries with the same name cause "Rel: can't make... relative to..." error

[per1234]

Arduino IDE 1.6.6 2015/09/28 06:42 Windows 7 64bit
I'm guessing that this issue belongs in this repository because the issue started around the time arduino-builder was added.

If there are libraries in C:\Program Files (x86)\arduino-nightly\libraries and sketchbook\libraries with the same name then compiling a sketch that includes that library fails. For example if I copy the Servo library to my sketchbook\libraries folder and compile Knob.ino I get:

C:\Program Files (x86)\arduino-nightly\arduino-builder -dump-prefs -logger=machine -hardware "C:\Program Files (x86)\arduino-nightly\hardware" -hardware "C:\Users\per\AppData\Local\Arduino15\packages" -hardware "E:\Stuff\misc\electronics\arduino\hardware" -tools "C:\Program Files (x86)\arduino-nightly\tools-builder" -tools "C:\Program Files (x86)\arduino-nightly\hardware\tools\avr" -tools "C:\Users\per\AppData\Local\Arduino15\packages" -libraries "E:\Stuff\misc\electronics\arduino\libraries" -libraries "C:\Program Files (x86)\arduino-nightly\libraries" -fqbn=arduino:avr:uno -ide-version=10606 -build-path "C:\Users\per\AppData\Local\Temp\buildbba0b171f7b3ad0f8360c2d9fa887ccb.tmp" -warnings=all -prefs=build.warn_data_percentage=75 -verbose "E:\Stuff\misc\electronics\arduino\libraries\Servo\examples\Knob\Knob.ino"
C:\Program Files (x86)\arduino-nightly\arduino-builder -compile -logger=machine -hardware "C:\Program Files (x86)\arduino-nightly\hardware" -hardware "C:\Users\per\AppData\Local\Arduino15\packages" -hardware "E:\Stuff\misc\electronics\arduino\hardware" -tools "C:\Program Files (x86)\arduino-nightly\tools-builder" -tools "C:\Program Files (x86)\arduino-nightly\hardware\tools\avr" -tools "C:\Users\per\AppData\Local\Arduino15\packages" -libraries "E:\Stuff\misc\electronics\arduino\libraries" -libraries "C:\Program Files (x86)\arduino-nightly\libraries" -fqbn=arduino:avr:uno -ide-version=10606 -build-path "C:\Users\per\AppData\Local\Temp\buildbba0b171f7b3ad0f8360c2d9fa887ccb.tmp" -warnings=all -prefs=build.warn_data_percentage=75 -verbose "E:\Stuff\misc\electronics\arduino\libraries\Servo\examples\Knob\Knob.ino"
Warning: platform.txt from core 'Arduino ARM (32-bits) Boards' contains deprecated recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.c.elf.flags} -mcpu={build.mcu} "-T{build.variant.path}/{build.ldscript}" "-Wl,-Map,{build.path}/{build.project_name}.map" {compiler.c.elf.extra_flags} -o "{build.path}/{build.project_name}.elf" "-L{build.path}" -mthumb -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--entry=Reset_Handler -Wl,--unresolved-symbols=report-all -Wl,--warn-common -Wl,--warn-section-align -Wl,--warn-unresolved-symbols -Wl,--start-group "{build.path}/syscalls_sam3.c.o" {object_files} "{build.variant.path}/{build.variant_system_lib}" "{build.path}/{archive_file}" -Wl,--end-group -lm -gcc, automatically converted to recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" {compiler.c.elf.flags} -mcpu={build.mcu} "-T{build.variant.path}/{build.ldscript}" "-Wl,-Map,{build.path}/{build.project_name}.map" {compiler.c.elf.extra_flags} -o "{build.path}/{build.project_name}.elf" "-L{build.path}" -mthumb -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--entry=Reset_Handler -Wl,--unresolved-symbols=report-all -Wl,--warn-common -Wl,--warn-section-align -Wl,--warn-unresolved-symbols -Wl,--start-group "{build.path}/core/syscalls_sam3.c.o" {object_files} "{build.variant.path}/{build.variant_system_lib}" "{build.path}/{archive_file}" -Wl,--end-group -lm -gcc. Consider upgrading this core.
Warning: platform.txt from core 'Arduino ARM (32-bits) Boards' contains deprecated recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{build.path}/{archive_file}" "{object_file}", automatically converted to recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}". Consider upgrading this core.
Warning: platform.txt from core 'Arduino SAMD (32-bits ARM Cortex-M0+) Boards' contains deprecated recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{build.path}/{archive_file}" "{object_file}", automatically converted to recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}". Consider upgrading this core.
"C:\Program Files (x86)\arduino-nightly\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -w -x c++ -M -MG -MP -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10606 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR    "C:\Users\per\AppData\Local\Temp\buildbba0b171f7b3ad0f8360c2d9fa887ccb.tmp\sketch\Knob.ino.cpp"
Rel: can't make \Stuff\misc\electronics\arduino\libraries\Servo\src relative to \Program Files (x86)\arduino-nightly\hardware\arduino\avr
Error compiling.

If I delete either library it compiles without errors. Using Arduino IDE 1.6.5r5 it compiles without errors(I just get the Multiple libraries were found for "Servo.h" notification).

Full output with duplicate libraries: https://gist.github.com/per1234/3b579b92234f25c1e76e

Full output without duplicate libraries(deleted C:\Program Files (x86)\arduino-nightly\libraries\Servo): https://gist.github.com/per1234/d746e420135c04fbe87d

[ffissore]

Investigating

[ffissore]

FYI fix available since beta17 available with hourly builds http://www.arduino.cc/en/Main/Software#hourly