compiling for wio_terminal has compile errors

[neilh10]

When compiling supplied example basic.ino for wio_terminal with Platformio SAMD51 has errors.

In file included from lib\Seeed_Arduino_Linechart/seeed_line_chart.h:2:0, from D:/usr/a/PlatformIO/Projects/wioT_linechart/src/basic.ino:1: lib\Seeed_Arduino_Linechart/seeed_graphics_base.h: At global scope: lib\Seeed_Arduino_Linechart/seeed_graphics_base.h:25:23: error: 'value' function uses 'auto' type specifier without trailing return type auto & name(type value) { \ ^ lib\Seeed_Arduino_Linechart/seeed_graphics_base.h:121:9: note: in expansion of macro 'xvprop' xvprop(point, value, (return_type )); ^~ lib\Seeed_Arduino_Linechart/seeed_graphics_base.h:25:23: note: deduced return type only available with -std=c++14 or -std=gnu++14 auto & name(type value) { \ ^ lib\Seeed_Arduino_Linechart/seeed_graphics_base.h:121:9: note: in expansion of macro 'xvprop' xvprop(point, value, (return_type ));

To Reproduce Very reproducible, and many other errors.

Processing seeed_wio_terminal (platform: atmelsam; board: seeed_wio_terminal; framework: arduino)

CONFIGURATION: https://docs.platformio.org/page/boards/atmelsam/seeed_wio_terminal.html PLATFORM: Atmel SAM (6.3.1) > Seeeduino Wio Terminal HARDWARE: SAMD51P19A 120MHz, 192KB RAM, 496KB Flash DEBUG: Current (atmel-ice) External (atmel-ice, blackmagic, jlink) PACKAGES:

• framework-arduino-samd-seeed 1.8.1
• framework-cmsis 2.50400.181126 (5.4.0)
• framework-cmsis-atmel 1.2.2

• toolchain-gccarmnoneeabi 1.70201.0 (7.2.1) Converting basic.ino LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf LDF Modes: Finder ~ deep+, Compatibility ~ soft Found 17 compatible libraries Scanning dependencies... Dependency Graph |-- 1.6.0+sha.6bc2cc1 | |-- 1.0 | | |-- 1.1.0+sha.655916e
  | |-- 1.1.0+sha.655916e
  |-- 1.1.0+sha.655916e |-- 1.0.0 | |-- 1.6.0+sha.6bc2cc1 | | |-- 1.0 | | | |-- 1.1.0+sha.655916e | | |-- 1.1.0+sha.655916e
  | |-- 1.0 | | |-- 1.1.0+sha.655916e
  | |-- 1.1.0+sha.655916e
  Building in release mode Compiling .pio\build\seeed_wio_terminal\src\basic.ino.cpp.o

                 ~~~~~~~~^~~~~

Expected behavior Expect it to compile with no errors when using supplied example Basic.ino A clear and concise description of what you expected to happen.

Desktop (please complete the following information): Windows 10

[RocketManRC]

I discovered the solution here which for some reason is not easy to find: https://forum.seeedstudio.com/t/linechart-library-for-wio-terminal-on-platformio-ide-needs-build-flags-std-gnu-14/258456.

Add the following lines to PlatformIO.ini:

build_unflags = -std=gnu++11 build_flags = -std=gnu++14

[neilh10]

Hey thanks.

[neilh10]

works for me