build: introduce declarative non-recursive build graph

1 files changed, 48 insertions, 0 deletions

diff --git a/scripts/build/probe-toolchain.sh b/scripts/build/probe-toolchain.sh
new file mode 100755
index 0000000..2f1f600
--- /dev/null
+++ b/scripts/build/probe-toolchain.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+set -eu
+output=$1
+cc=$2
+cxx=$3
+ld=$4
+family=$5
+target=$6
+gcc_toolchain=$7
+sysroot=$8
+
+set --
+if [ "$family" = clang ]; then
+    set -- "$@" "--target=$target"
+    [ -z "$gcc_toolchain" ] || set -- "$@" "--gcc-toolchain=$gcc_toolchain"
+    [ -z "$sysroot" ] || set -- "$@" "--sysroot=$sysroot"
+fi
+
+probe() {
+    language=$1
+    standard=$2
+    shift 2
+    compiler=$cc
+    [ "$language" = c++ ] && compiler=$cxx
+    printf '' | "$compiler" "$@" "-std=$standard" -x "$language" \
+        -fsyntax-only - >/dev/null 2>&1
+}
+
+tmp="$output.tmp.$$"
+mkdir -p "$(dirname "$output")"
+{
+    echo "cc=$($cc --version | head -n 1)"
+    echo "cxx=$($cxx --version | head -n 1)"
+    echo "ld=$($ld --version | head -n 1)"
+    echo "target=$target"
+    printf 'c23='; if probe c gnu23 "$@"; then echo yes; else echo no; fi
+    printf 'cxx23='; if probe c++ c++23 "$@"; then echo yes; else echo no; fi
+    printf 'fno-pie='; if probe c++ c++23 "$@" -fno-pie; then echo yes; else echo no; fi
+    printf 'mcmodel-medany='; if probe c++ c++23 "$@" -mcmodel=medany; then echo yes; else echo no; fi
+} > "$tmp"
+mv -f "$tmp" "$output"
+
+grep -q '^c23=yes$' "$output"
+grep -q '^cxx23=yes$' "$output"
+grep -q '^fno-pie=yes$' "$output"
+grep -q '^mcmodel-medany=yes$' "$output"