Compilation fails on Windows with GNU toolchain

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On Windows, with the MSVC toolchain, no issue. With the GNU toolchain, I get an error. Does it require a separate installation of Mingw that includes gcc?

So, more specifically

• rustup default stable-x86_64-pc-windows-msvc works
• rustup default stable-x86_64-pc-windows-gnu gives the error below

Microsoft Windows [Version 10.0.19045.5487]
(c) Microsoft Corporation. All rights reserved.

D:\projects\rust\_clones\stacker>cargo build
   Compiling cfg-if v1.0.0
   Compiling psm v0.1.25 (D:\projects\rust\_clones\stacker\psm)
   Compiling stacker v0.1.19 (D:\projects\rust\_clones\stacker)
   Compiling windows_x86_64_gnu v0.52.6
   Compiling libc v0.2.171
   Compiling windows-targets v0.52.6                                                                                                                                                                                                           
   Compiling windows-sys v0.59.0                                                                                                                                                                                                               
warning: stacker@0.1.19: Compiler family detection failed due to error: ToolNotFound: failed to find tool "gcc.exe": program not found (see https://docs.rs/cc/latest/cc/#compile-time-requirements for help)                                  
error: failed to run custom build command for `stacker v0.1.19 (D:\projects\rust\_clones\stacker)`

Caused by:
  process didn't exit successfully: `D:\projects\rust\_clones\stacker\target\debug\build\stacker-9b86e9bdd73208ee\build-script-build` (exit code: 1)
  --- stdout
  OUT_DIR = Some(D:\projects\rust\_clones\stacker\target\debug\build\stacker-f050fe67fe900bca\out)
  OPT_LEVEL = Some(0)
  TARGET = Some(x86_64-pc-windows-gnu)
  HOST = Some(x86_64-pc-windows-gnu)
  cargo:rerun-if-env-changed=CC_x86_64-pc-windows-gnu
  CC_x86_64-pc-windows-gnu = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_windows_gnu
  CC_x86_64_pc_windows_gnu = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:warning=Compiler family detection failed due to error: ToolNotFound: failed to find tool "gcc.exe": program not found (see https://docs.rs/cc/latest/cc/#compile-time-requirements for help)
  RUSTC_WRAPPER = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some(true)
  CARGO_CFG_TARGET_FEATURE = Some(cmpxchg16b,fxsr,sse,sse2,sse3)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_gnu
  CFLAGS_x86_64_pc_windows_gnu = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-windows-gnu
  CFLAGS_x86_64-pc-windows-gnu = None
  CARGO_ENCODED_RUSTFLAGS = Some()

  --- stderr


  error occurred in cc-rs: failed to find tool "gcc.exe": program not found (see https://docs.rs/cc/latest/cc/#compile-time-requirements for help)


warning: build failed, waiting for other jobs to finish...
warning: psm@0.1.25: Compiler family detection failed due to error: ToolNotFound: failed to find tool "gcc.exe": program not found (see https://docs.rs/cc/latest/cc/#compile-time-requirements for help)                                      
warning: psm@0.1.25: Compiler family detection failed due to error: ToolNotFound: failed to find tool "gcc.exe": program not found (see https://docs.rs/cc/latest/cc/#compile-time-requirements for help)
error: failed to run custom build command for `psm v0.1.25 (D:\projects\rust\_clones\stacker\psm)`

Caused by:
  process didn't exit successfully: `D:\projects\rust\_clones\stacker\target\debug\build\psm-fb2b73dd4fd8303e\build-script-build` (exit code: 1)
  --- stdout
  cargo:rustc-check-cfg=cfg(switchable_stack,asm,link_asm)
  OPT_LEVEL = Some(0)
  OUT_DIR = Some(D:\projects\rust\_clones\stacker\target\debug\build\psm-b519261e4261083d\out)
  TARGET = Some(x86_64-pc-windows-gnu)
  HOST = Some(x86_64-pc-windows-gnu)
  cargo:rerun-if-env-changed=CC_x86_64-pc-windows-gnu
  CC_x86_64-pc-windows-gnu = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_windows_gnu
  CC_x86_64_pc_windows_gnu = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:warning=Compiler family detection failed due to error: ToolNotFound: failed to find tool "gcc.exe": program not found (see https://docs.rs/cc/latest/cc/#compile-time-requirements for help)
  RUSTC_WRAPPER = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some(true)
  CARGO_CFG_TARGET_FEATURE = Some(cmpxchg16b,fxsr,sse,sse2,sse3)
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_gnu
  CFLAGS_x86_64_pc_windows_gnu = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-windows-gnu
  CFLAGS_x86_64-pc-windows-gnu = None
  CARGO_ENCODED_RUSTFLAGS = Some()
  cargo:rustc-cfg=asm
  cargo:rustc-cfg=link_asm
  cargo:warning=Compiler family detection failed due to error: ToolNotFound: failed to find tool "gcc.exe": program not found (see https://docs.rs/cc/latest/cc/#compile-time-requirements for help)

  --- stderr


  error occurred in cc-rs: failed to find tool "gcc.exe": program not found (see https://docs.rs/cc/latest/cc/#compile-time-requirements for help)


                                                                                                                                                                                                                                               
D:\projects\rust\_clones\stacker>

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I saw another issue where you redirected to cc-rs, but I don't know if that's the same problem, nor what to report to cc-rs since I'm not directly using that.