I'm getting build errors with Arduino IDE 1.8.14.

[tanakamasayuki]

Description:

A build-in library option has been added.
As a result, the library for AVR is loaded.

-built-in-libraries C:\Program Files (x86)\Arduino\libraries

Sketch: (leave the backquotes for code formatting)

#include "SD.h"
void setup() {
}
void loop() {
}

Debug Messages:

In file included from C:\Program Files (x86)\Arduino\libraries\SD\src/utility/Sd2Card.h:26:0,
                 from C:\Program Files (x86)\Arduino\libraries\SD\src/utility/SdFat.h:29,
                 from C:\Program Files (x86)\Arduino\libraries\SD\src/SD.h:20,
                 from C:\Users\tanaka\Documents\Arduino\buildtest\buildtest.ino:1:
C:\Program Files (x86)\Arduino\libraries\SD\src/utility/Sd2PinMap.h:524:2: error: #error Architecture or board not supported.
 #error Architecture or board not supported.
  ^

[tanakamasayuki]

built-in-libraries

https://github.com/arduino/Arduino/blob/master/arduino-core/src/cc/arduino/Compiler.java#L249

    addPathFlagIfPathExists(cmd, "-built-in-libraries", BaseNoGui.getContentFile("libraries"));

BaseNoGui.getContentFile

https://github.com/arduino/Arduino/blob/master/arduino-core/src/processing/app/BaseNoGui.java#L199

  static public File getContentFile(String name) {
    String appDir = System.getProperty("APP_DIR");
    if (appDir == null || appDir.length() == 0) {
      appDir = currentDirectory;
    }
    File installationFolder = new File(appDir);
    return new File(installationFolder, name);
  }

APP_DIR

https://github.com/arduino/Arduino/blob/master/build/windows/launcher/config.xml#L70

    <opt>-DAPP_DIR="%EXEDIR%"</opt>

It may be a fixed value.

[lbernstone]

As a workaround, I would propose fixing arduino's version (Arduino/libraries/SD/library.properties and arduino-1.8.14/libraries/SD/library.properties) with:
architectures=avr,samd,sam,megaavr,teensy
I've opened an issue with Arduino about this.

[per1234]

Hi all. This has already been fixed and new releases of both Arduino IDEs and Arduino CLI will be out soon. For details, please see this: arduino/arduino-cli#1292

[lbernstone]

Ok, fixed in the repo SD library also.

[lbernstone]

Ok, so rather than changing arduino files, change <esp32>/libraries/SD/library.properties:
name=SD

[tanakamasayuki]

https://github.com/arduino/Arduino/releases/tag/1.8.15

It has been fixed.