build: Factor out vars.mk generation into a script

1 files changed, 81 insertions, 0 deletions

diff --git a/config/vars.sh b/config/vars.sh
new file mode 100755
index 0000000..c0fb124
--- /dev/null
+++ b/config/vars.sh
@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+
+# Copyright © Tavian Barnes <tavianator@tavianator.com>
+# SPDX-License-Identifier: 0BSD
+
+# Writes the saved variables to gen/vars.mk
+
+set -eu
+
+print() {
+    NAME="$1"
+    OP="${2:-:=}"
+
+    if (($# >= 3)); then
+        printf '# %s\n' "${3#X}"
+        declare -n VAR="$3"
+        VALUE="${VAR:-}"
+    else
+        # Try X$NAME, $NAME, ""
+        local -n XVAR="X$NAME"
+        local -n VAR="$NAME"
+        VALUE="${XVAR:-${VAR:-}}"
+    fi
+
+    printf '%s %s %s\n' "$NAME" "$OP" "$VALUE"
+}
+
+cond_flags() {
+    local -n COND="$1"
+
+    if [[ "${COND:-}" == *y* ]]; then
+        print "$2" += "${1}_${2}"
+    fi
+}
+
+print PREFIX
+print MANDIR
+
+print OS
+print ARCH
+
+print CC
+print INSTALL
+print MKDIR
+print RM
+
+print CPPFLAGS := BFS_CPPFLAGS
+cond_flags TSAN CPPFLAGS
+cond_flags LINT CPPFLAGS
+cond_flags RELEASE CPPFLAGS
+print CPPFLAGS += XCPPFLAGS
+print CPPFLAGS += EXTRA_CPPFLAGS
+
+print CFLAGS := BFS_CFLAGS
+cond_flags ASAN CFLAGS
+cond_flags LSAN CFLAGS
+cond_flags MSAN CFLAGS
+cond_flags TSAN CFLAGS
+cond_flags UBSAN CFLAGS
+cond_flags SAN CFLAGS
+cond_flags GCOV CFLAGS
+cond_flags LINT CFLAGS
+cond_flags RELEASE CFLAGS
+print CFLAGS += XCFLAGS
+print CFLAGS += EXTRA_CFLAGS
+
+print LDFLAGS := XLDFLAGS
+print LDFLAGS += EXTRA_LDFLAGS
+
+print LDLIBS := XLDLIBS
+print LDLIBS += EXTRA_LDLIBS
+print LDLIBS += BFS_LDLIBS
+
+print PKGS
+
+# Disable ASLR on FreeBSD when sanitizers are enabled
+case "$XOS-$SAN" in
+    FreeBSD-*y*)
+        printf 'POSTLINK = elfctl -e +noaslr $$@\n'
+        ;;
+esac