GNUmakefile: Swap uname -s with rustc --print host-tuple for cross-build and MSYS

Author: oech3

.github/workflows/make.yml

@@ -266,6 +266,40 @@ jobs:
         # 2. the makefile doesn't try to install libstdbuf even though stdbuf is skipped
         DESTDIR=/tmp/ make SKIP_UTILS="stdbuf" install
 
+  # keep this job minimal to avoid have many duplicated build with CICD
+  build_makefile-other:
+    name: Build/Makefile
+    runs-on: ${{ matrix.job.os }}
+    env:
+      CARGO_INCREMENTAL: 0
+    strategy:
+      fail-fast: false
+      matrix:
+        job:
+          - { os: windows-latest , features: feat_os_windows }
+    steps:
+    - uses: actions/checkout@v6
+      with:
+        persist-credentials: false
+    - uses: Swatinem/rust-cache@v2
+    - name: Run sccache-cache
+      id: sccache-setup
+      uses: mozilla-actions/sccache-action@v0.0.9
+      continue-on-error: true
+    - name: Export sccache
+      if: steps.sccache-setup.outcome == 'success'
+      run: |
+        echo "RUSTC_WRAPPER=sccache" >> $GITHUB_ENV
+        echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV
+    - name: "`make build`"
+      shell: bash
+      run: |
+        set -x
+        # Check that we exclude unix programs to avoid build failure
+        make PREFIX=/tmp/usr MULTICALL=y COMPLETIONS=n MANPAGES=n LOCALES=n \
+         SKIP_UTILS="arch b2sum base32 base64 basename basenc cat cksum comm cp csplit cut date dd df dir dircolors dirname du echo env expand expr factor false fmt fold head hostname join link ln ls md5sum mkdir mktemp more mv nl nproc numfmt od paste pr printenv printf ptx pwd readlink realpath rm rmdir seq sha1sum sha224sum sha256sum sha384sum sha512sum shred shuf sleep sort split sum sync tac tail tee test touch tr truncate tsort uname unexpand uniq unlink vdir wc whoami yes"
+        target/debug/coreutils.exe true
+
   test_busybox:
     name: Tests/BusyBox test suite
     runs-on: ${{ matrix.job.os }}

GNUmakefile

@@ -62,17 +62,14 @@ TOYBOX_ROOT := $(BASEDIR)/tmp
 TOYBOX_VER  := 0.8.12
 TOYBOX_SRC  := $(TOYBOX_ROOT)/toybox-$(TOYBOX_VER)
 
-#------------------------------------------------------------------------
-# Detect the host system.
-# On Windows uname -s might return MINGW_NT-* or CYGWIN_NT-*.
-# Otherwise let it default to the kernel name returned by uname -s
-# (Linux, Darwin, FreeBSD, …).
-#------------------------------------------------------------------------
-OS ?= $(shell uname -s)
+# Detect the target system
+# See https://doc.rust-lang.org/beta/rustc/platform-support.html
+# todo: support building wasm
+OS := $(or $(CARGO_BUILD_TARGET),$(shell rustc --print host-tuple))
 
 # Windows does not allow symlink by default.
 # Allow to override LN for AppArmor.
-ifneq (,$(findstring _NT,$(OS)))
+ifneq (,$(findstring windows,$(OS)))
 	LN ?= ln -f
 endif
 LN ?= ln -sf
@@ -97,7 +94,7 @@ SELINUX_PROGS := \
 
 $(info Detected OS = $(OS))
 
-ifeq (,$(findstring MINGW,$(OS)))
+ifeq (,$(findstring windows,$(OS)))
 	PROGS += $(UNIX_PROGS)
 endif
 ifeq ($(SELINUX_ENABLED),1)
@@ -288,7 +285,7 @@ install: build install-manpages install-completions install-locales
 	mkdir -p $(INSTALLDIR_BIN)
 ifneq (,$(and $(findstring stdbuf,$(UTILS)),$(findstring feat_external_libstdbuf,$(CARGOFLAGS))))
 	mkdir -p $(DESTDIR)$(LIBSTDBUF_DIR)
-ifneq (,$(findstring CYGWIN,$(OS)))
+ifneq (,$(findstring cygwin,$(OS)))
 	$(INSTALL) -m 755 $(BUILDDIR)/deps/stdbuf.dll $(DESTDIR)$(LIBSTDBUF_DIR)/libstdbuf.dll
 else
 	$(INSTALL) -m 755 $(BUILDDIR)/deps/libstdbuf.* $(DESTDIR)$(LIBSTDBUF_DIR)/
@@ -308,7 +305,7 @@ else
 endif
 
 uninstall:
-ifeq (,$(findstring MINGW,$(OS)))
+ifeq (,$(findstring windows,$(OS)))
 	rm -f $(DESTDIR)$(LIBSTDBUF_DIR)/libstdbuf.*
 	-rm -d $(DESTDIR)$(LIBSTDBUF_DIR) 2>/dev/null || true
 endif