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, 27 insertions, 0 deletions

diff --git a/src/meson.build b/src/meson.build
new file mode 100644
index 0000000..6eaf0d4
--- /dev/null
+++ b/src/meson.build
@@ -0,0 +1,27 @@
+subdir('osc')
+
+# The x86-64 SIMD kernels pick their level at run time (see simd.h), so the
+# library needs no ISA flags. -march in c_args sets the lowest level.
+term_headless_lib = both_libraries('term_headless',
+  'core.c',
+  'escape.c',
+  'fastcsi.c',
+  'gstore.c',
+  'hist.c',
+  'hist_view.c',
+  'input.c',
+  'isa.c',
+  'palette.c',
+  'scan.c',
+  'screen.c',
+  'selection.c',
+  'snapshot.c',
+  'term.c',
+  'text.c',
+  'text_run.c',
+  term_osc_src,
+  include_directories: term_private_inc,
+  dependencies: [m_dep],
+  gnu_symbol_visibility: 'hidden',
+  install: false
+)