Trouble importing WString as dependency of StreamUtils

[octovolt]

Hi, I'm having an issue where the WString.h dependency within StreamUtils.h (actually StringPrint.hpp) cannot be found. Any suggestions to make this work correctly?

Context: I originally wrote this code for Teensy where it was compiling correctly. I am trying to switch to the Pico for my project.

/Users/bfisher/Library/Arduino15/packages/rp2040/tools/pqt-gcc/1.4.0-c-0196c06/bin/arm-none-eabi-g++ -I /var/folders/yp/bq39bkrd40n1n92xpzgy68dm0000gn/T/arduino_build_238754/core -c -Werror=return-type -DCFG_TUSB_MCU=OPT_MCU_RP2040 -DUSB_VID=0x2e8a -DUSB_PID=0x000a "-DUSB_MANUFACTURER=\"Raspberry Pi\"" "-DUSB_PRODUCT=\"Pico\"" -DPICO_CYW43_ARCH_THREADSAFE_BACKGROUND=1 -DCYW43_LWIP=0 -DLWIP_IPV6=0 -DLWIP_IPV4=1 -DLWIP_IGMP=1 -DLWIP_CHECKSUM_CTRL_PER_NETIF=1 "-DARDUINO_VARIANT=\"rpipico\"" -DTARGET_RP2040 -march=armv6-m -mcpu=cortex-m0plus -mthumb -ffunction-sections -fdata-sections -fno-exceptions -DARM_MATH_CM0_FAMILY -DARM_MATH_CM0_PLUS -iprefix/Users/bfisher/Library/Arduino15/packages/rp2040/hardware/rp2040/2.6.5/ @/Users/bfisher/Library/Arduino15/packages/rp2040/hardware/rp2040/2.6.5/lib/platform_inc.txt -I/Users/bfisher/Library/Arduino15/packages/rp2040/hardware/rp2040/2.6.5/include -fno-rtti -std=gnu++17 -g -pipe -w -x c++ -E -CC -DSERIALUSB_PID=0x000a -DUSBD_MAX_POWER_MA=250 -DF_CPU=133000000L -DARDUINO=10815 -DARDUINO_RASPBERRY_PI_PICO "-DBOARD_NAME=\"RASPBERRY_PI_PICO\"" -DARDUINO_ARCH_RP2040 -Os -DWIFICC=CYW43_COUNTRY_WORLDWIDE -I/Users/bfisher/Library/Arduino15/packages/rp2040/hardware/rp2040/2.6.5/cores/rp2040 -I/Users/bfisher/Library/Arduino15/packages/rp2040/hardware/rp2040/2.6.5/variants/rpipico -I/Users/bfisher/Library/Arduino15/packages/rp2040/hardware/rp2040/2.6.5/libraries/Wire/src -I/Users/bfisher/Documents/Arduino/libraries/Adafruit_MCP4728 -I/Users/bfisher/Documents/Arduino/libraries/Adafruit_BusIO -I/Users/bfisher/Library/Arduino15/packages/rp2040/hardware/rp2040/2.6.5/libraries/SPI/src -I/Users/bfisher/Documents/Arduino/libraries/Adafruit_seesaw_Library -I/Users/bfisher/Documents/Arduino/libraries/ArduinoJson/src -I/Users/bfisher/Library/Arduino15/packages/rp2040/hardware/rp2040/2.6.5/libraries/SDFS/src -I/Users/bfisher/Library/Arduino15/packages/rp2040/hardware/rp2040/2.6.5/libraries/ESP8266SdFat/src -I/Users/bfisher/Documents/Arduino/libraries/StreamUtils/src /var/folders/yp/bq39bkrd40n1n92xpzgy68dm0000gn/T/arduino_build_238754/sketch/Recollections.ino.cpp -o /dev/null
Alternatives for WString.h: []
ResolveLibrary(WString.h)
  -> candidates: []
In file included from /Users/bfisher/Documents/Arduino/libraries/StreamUtils/src/StreamUtils.hpp:16,
                 from /Users/bfisher/Documents/Arduino/libraries/StreamUtils/src/StreamUtils.h:5,
                 from /Users/bfisher/Documents/Arduino/Recollections/SDCard.h:9,
                 from /Users/bfisher/Documents/Arduino/Recollections/Recollections.ino:53:
/Users/bfisher/Documents/Arduino/libraries/StreamUtils/src/StreamUtils/Prints/StringPrint.hpp:8:10: fatal error: WString.h: No such file or directory
    8 | #include <WString.h>
      |          ^~~~~~~~~~~
compilation terminated.

[earlephilhower]

Try using #include <api/String.h>. The WString.h is not the Arduino official standard (but I do know many other cores do support it).

[octovolt]

Including that file in my own code had no effect, but if I hack into the libraries I can get it to compile.

I had to alter these to use #include <api/String.h> instead of #include <WString.h>:

/Users/bfisher/Documents/Arduino/libraries/StreamUtils/src/StreamUtils/Streams/StringStream.hpp
/Users/bfisher/Documents/Arduino/libraries/StreamUtils/src/StreamUtils/Prints/StringPrint.hpp

Thanks a ton for the quick help!

If there is a way to do this without hacking the libraries, please let me know as I'd like to make this project friendly to contributors.

[earlephilhower]

#1083 will add this header to redirect to api/String.h so give it a couple weeks until the new release and you should be fine.

[specialcircumstances]

HI @octopus-arts - did you get StreamUtils working on Pi Pico?