Add ABI detection diagnostics and target-triple mismatch warning

Author: kristjanvalur

tools/abiname.sh

@@ -18,6 +18,35 @@ canonicalize_abi() {
 	esac
 }
 
+detect_target_triple() {
+	if ${CC} -dumpmachine >/dev/null 2>&1; then
+		${CC} -dumpmachine
+		return 0
+	fi
+	if ${CC} --print-target-triple >/dev/null 2>&1; then
+		${CC} --print-target-triple
+		return 0
+	fi
+	printf '%s\n' ""
+}
+
+abi_from_target_triple() {
+	triple=$(printf '%s' "$1" | tr '[:upper:]' '[:lower:]')
+	case "${triple}" in
+		*x86_64*apple-darwin*|*x86_64*darwin*) printf '%s\n' "darwin_x86_64" ;;
+		*arm64*apple-darwin*|*aarch64*apple-darwin*|*arm64*darwin*|*aarch64*darwin*) printf '%s\n' "darwin_arm64" ;;
+		*x86_64*linux*) printf '%s\n' "sysv_amd64" ;;
+		*i?86*linux*) printf '%s\n' "sysv_i386" ;;
+		*aarch64*linux*) printf '%s\n' "aarch64" ;;
+		*arm*linux*gnueabi*|*armv7*linux*|*armv6*linux*) printf '%s\n' "arm32" ;;
+		*riscv64*linux*) printf '%s\n' "riscv64" ;;
+		*aarch64*w64*mingw*|*arm64*windows*|*aarch64*windows*) printf '%s\n' "win_arm64" ;;
+		*x86_64*w64*mingw*|*x86_64*windows*) printf '%s\n' "win_x64" ;;
+		*i?86*w64*mingw*|*i?86*windows*) printf '%s\n' "win_x86" ;;
+		*) printf '%s\n' "" ;;
+	esac
+}
+
 mkdir -p "${here}/tmp"
 # Clean up any stale temp files first
 rm -f "${here}/tmp"/abiname*.c "${here}/tmp"/abiname*.c.out
@@ -27,13 +56,26 @@ tmp=$(mktemp "${here}/tmp/abinameXXX.c")
 CC=${1:-cc}
 CFLAGS=${2:-}
 ABI_OVERRIDE=${3:-${STACKMAN_ABI:-}}
+target_triple=$(detect_target_triple)
 if [ -n "${ABI_OVERRIDE}" ]; then
-	canonicalize_abi "${ABI_OVERRIDE}"
+	abi=$(canonicalize_abi "${ABI_OVERRIDE}")
+	if [ -n "${STACKMAN_ABI_DEBUG:-}" ] || [ -n "${STACKMAN_ABI_TRACE:-}" ]; then
+		printf '%s\n' "stackman abiname: cc=${CC} target=${target_triple:-unknown} abi=${abi} source=override" >&2
+	fi
+	printf '%s\n' "${abi}"
 	exit 0
 fi
 ${CC} ${CFLAGS} -I${here}/../stackman -E -o "${tmp}" "${here}/abiname.c"
 #2 compile resulting file
 cc -o "${tmp}.out" "${tmp}"
 #3 run it
 abi=$("${tmp}.out")
-canonicalize_abi "${abi}"
+abi=$(canonicalize_abi "${abi}")
+target_abi=$(abi_from_target_triple "${target_triple}")
+if [ -n "${target_abi}" ] && [ "${target_abi}" != "${abi}" ]; then
+	printf '%s\n' "warning: stackman ABI mismatch: compiler target '${target_triple}' suggests '${target_abi}', macro probe selected '${abi}'. Consider setting STACKMAN_ABI explicitly." >&2
+fi
+if [ -n "${STACKMAN_ABI_DEBUG:-}" ] || [ -n "${STACKMAN_ABI_TRACE:-}" ]; then
+	printf '%s\n' "stackman abiname: cc=${CC} target=${target_triple:-unknown} abi=${abi} source=macro" >&2
+fi
+printf '%s\n' "${abi}"