Why doesn t gcc define ARM ARCH ? Instead it defines bunch of below macros. See all architectires[] table in gcc config arm arm.c. On a side note it defines Source Code for Linux v2.13.6.

isalpha.pass.c
arm_arch.c

• We are an exchange download platform that only provides communication channels. The downloaded content comes from the internet. Except for download issues, please Google on your own.
• The downloaded content is provided for members to upload. If it unintentionally infringes on your copyright, please contact us.
• Please use Winrar for decompression tools
• If download fail, Try it againg or Feedback to us.
• If downloaded content did not match the introduction, Feedback to us，Confirm and will be refund.
• Before downloading, you can inquire through the uploaded person information

Nothing．