build(Examples,Tools): Upgrade RISC-V Toolchain, Update Project Files

[Jake-Carter]

This PR depends on #619 for its consolidated gcc.mk files.

Overview

• Add support for xPack riscv-none-elf toolchain. (5188f32)
• Use riscv-none-elf toolchain as default instead of the deprecated riscv-none-embed. (d678542)
• Update project files to use riscv-none-elf version 12.2.0-3.1. (d678542, 92d8d1c)
  • The install location for the updated toolchain shall be Tools/xPack/riscv-none-elf-gcc/12.2.0-3.1
• Add the new toolchain to the build tester
• Update all project files

Project File Updates

For the most part, the changes are:

• Use the new RISC-V toolchain

diff --git a/Examples/MAX78000/Hello_World/.vscode/settings.json b/Examples/MAX78000/Hello_World/.vscode/settings.json
index 3a6b363122..8e185bb9ce 100755
--- a/Examples/MAX78000/Hello_World/.vscode/settings.json
+++ b/Examples/MAX78000/Hello_World/.vscode/settings.json
@@ -28,11 +28,11 @@
     "RV_OCD_target_file":"${config:target}_riscv.cfg",
 
     "v_Arm_GCC":"10.3",
-    "v_xPack_GCC":"10.2.0-1.2",
+    "v_xPack_GCC":"12.2.0-3.1",
 
     "OCD_path":"${config:MAXIM_PATH}/Tools/OpenOCD",
     "ARM_GCC_path":"${config:MAXIM_PATH}/Tools/GNUTools/${config:v_Arm_GCC}",
-    "xPack_GCC_path":"${config:MAXIM_PATH}/Tools/xPack/riscv-none-embed-gcc/${config:v_xPack_GCC}",
+    "xPack_GCC_path":"${config:MAXIM_PATH}/Tools/xPack/riscv-none-elf-gcc/${config:v_xPack_GCC}",
     "Make_path":"${config:MAXIM_PATH}/Tools/MSYS2/usr/bin",

• Remove duplicate entries in .vscode/settings.json (resolves MSDK-1201)
• Include a file for detecting compiler-specific and build-specific compiler definitions (see comment) (53527bb, 35ab3df)

diff --git a/Examples/MAX32520/AES/.vscode/settings.json b/Examples/MAX32520/AES/.vscode/settings.json
index d0310e8209..df1171e0f7 100755
--- a/Examples/MAX32520/AES/.vscode/settings.json
+++ b/Examples/MAX32520/AES/.vscode/settings.json
@@ -71,6 +71,9 @@
         "TARGET=${config:target}",
         "TARGET_REV=0x4131",
         "__GNUC__"
+    ],
+    "C_Cpp.default.forcedInclude": [
+        "${workspaceFolder}/build/project_defines.h"
     ]
 }

MSDKGen has also been updated to check for projects that come preconfigured for non-default boards to match project settings when needed.

RISC-V -march Change

Commit: 5188f32

The upgrade to riscv-none-elf changed the default ISA spec. As recommended by this discussion post, the default -march option when using the new toolchain is now -march=rv32im_zicsr_zifencei. Note the new option does not use the compressed instruction set.

The old toolchain still defaults to -march=rv32imc.

-mabi has been kept at ilp32.

Our old gcc_riscv.mk file also seemed to be passing -march=rv32im to the compiler, but -march=rv32imafdc to the linker. It also did not give the -mabi option to the linker. I think this was a mistake but I'm not sure what the ramifications of the old behavior was. The new implementation passes the same -march and -mabi to the compiler, assembler, and linker stages.

[sihyung-maxim]

Don't know too much about the toolchain and project files, but looks good.

[Jake-Carter]

Reverted mass project generation to make this PR more readable. The diff shouldn't crash your laptop anymore

[lorne-maxim]

I don't think we have any code anymore that uses 'TARGET_REV'. We should probably start trying to phase it out.

[lorne-maxim]

Consider using $(ARM_PREFIX)-objcopy and $(RISCV_PREFIX)-objcopy.

[BobbyCounts]

Changes look good, I verified the added RISCV extensions are supported in the RTL