term: move the term core to subprojects/term

The core now builds, tests, and benchmarks alone, as a Meson subproject
with no dependency on the main tree.

- include/term/ holds term.h and the header-only unicode/. src/ holds
  the core and its private headers. The main tree gets only
  include/term through term_dep, so it cannot reach a private header.
- The term tests, the term benchmarks, the Kitty parser suite, and
  tools/amalgamate.py and tools/generate_unicode.py move with it. The
  tests run as term:<name>.
- The main build passes its -march (arch_flag) and b_ndebug to the
  subproject. A directory configured before this commit needs
  meson configure -Dterm:arch_flag=-march=... once.
- The term tests compile with -UNDEBUG. They do work inside assert.
- The subproject exports term_test_dep with term_api.h, for the main
  tree's render, thumbnail, color, and selection tests.
- The Kitty bridge used struct vector2i and has not compiled since the
  public API redesign. It builds again. 2 of its 14 tests fail: REP
  after a tab, and a cursor report after a resize.
- dirgraph.py drops the term and unicode layers. Its self-test uses pty.
- The symbols test ignores the __odr_asan symbols that ASan adds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/cross_test.sh b/tests/cross_test.sh
new file mode 100644
index 0000000..6c0efa2
--- /dev/null
+++ b/tests/cross_test.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# The term core compiles as strict C11 for the platforms a host may embed
+# it on. zig cc supplies the cross compilers. The aarch64 targets build the
+# NEON paths, and windows-gnu builds the Windows path of compat.h. The
+# amalgamation, one term.c, compiles the same way.
+set -euo pipefail
+root=${1:-$(dirname "$0")/..}
+cd "$root/src"
+command -v zig >/dev/null || { echo "zig not found; skipping"; exit 77; }
+
+out=$(mktemp -d)
+trap 'rm -rf "$out"' EXIT
+python3 "$root/tools/amalgamate.py" "$root" "$out/amalgamation"
+status=0
+for target in aarch64-linux-gnu x86_64-macos aarch64-macos x86_64-windows-gnu; do
+    for src in *.c osc/*.c; do
+        zig cc -target "$target" -std=c11 -O2 -Wall -Wextra -Wpedantic -Werror \
+            -I. -I../include/term -c "$src" -o "$out/obj.o" || { echo "$target: $src fails" >&2; status=1; }
+    done
+    zig cc -target "$target" -std=c11 -O2 -Wall -Wextra -Wpedantic -Werror \
+        -c "$out/amalgamation/term.c" -o "$out/obj.o" ||
+        { echo "$target: the amalgamation fails" >&2; status=1; }
+done
+exit $status