From d35766e387b720296176f1adec15fd5265bf94ca Mon Sep 17 00:00:00 2001
From: cnc <cnc@localhost>
Date: Fri, 5 Jun 2026 21:55:31 +0800
Subject: [PATCH] =?UTF-8?q?=E8=A1=A5=E9=BD=90=E5=A4=9A=E4=B8=BB=E8=BD=B4?=
 =?UTF-8?q?=20G76=20source-linked=20=E8=A6=86=E7=9B=96?=
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

---
 test-linuxcnc-source-link.sh               | 28 ++++++++++++++++++++++
 tests/gcode/linuxcnc_multi_spindle_g76.ngc |  7 ++++++
 2 files changed, 35 insertions(+)
 create mode 100644 tests/gcode/linuxcnc_multi_spindle_g76.ngc

diff --git a/test-linuxcnc-source-link.sh b/test-linuxcnc-source-link.sh
index f6883a8..f17a8bc 100755
--- a/test-linuxcnc-source-link.sh
+++ b/test-linuxcnc-source-link.sh
@@ -313,6 +313,12 @@ CNC_SIM_RS274_VAR="$var_file" \
 INI_FILE_NAME="$multi_spindle_threading_file" CNC_SIM_RS274_VAR="$var_file" \
     "$build_dir/linuxcnc_rs274_source_dump" tests/gcode/linuxcnc_multi_spindle_threading.ngc \
     >"$output_dir/cnc_sim_linuxcnc_source_multi_spindle_threading.json"
+# Source basis: LinuxCNC src/emc/rs274ngc/rs274ngc_pre.cc init reads
+# [TRAJ] SPINDLES from INI_FILE_NAME, and interp_convert.cc assigns
+# active_spindle from the G76 $ selector before convert_threading_cycle().
+INI_FILE_NAME="$multi_spindle_threading_file" CNC_SIM_RS274_VAR="$var_file" \
+    "$build_dir/linuxcnc_rs274_source_dump" tests/gcode/linuxcnc_multi_spindle_g76.ngc \
+    >"$output_dir/cnc_sim_linuxcnc_source_multi_spindle_g76.json"
 CNC_SIM_RS274_VAR="$var_file" \
     "$build_dir/linuxcnc_rs274_source_dump" tests/gcode/linuxcnc_threading_cycle.ngc \
     >"$output_dir/cnc_sim_linuxcnc_source_threading_cycle.json"
@@ -2082,6 +2088,27 @@ if not any(
 ):
     raise SystemExit("missing source-linked G33.1 selected-spindle rigid tap motion line")
 
+multi_spindle_g76 = json.loads((OUTPUT_DIR / "cnc_sim_linuxcnc_source_multi_spindle_g76.json").read_text())
+if not any(
+    event["type"] == "comment" and
+    event["line"] == 6 and
+    event["reserved"] == 3301 and
+    event["tool"] == 1 and
+    event["feed"] == 0.05
+    for event in multi_spindle_g76
+):
+    raise SystemExit("missing source-linked G76 selected-spindle sync start")
+if not any(
+    event["type"] == "comment" and event["line"] == 6 and event["reserved"] == 3300
+    for event in multi_spindle_g76
+):
+    raise SystemExit("missing source-linked G76 selected-spindle sync stop")
+if not any(
+    event["type"] == "linear-feed" and event["line"] == 6 and event["end"]["z"] == -1
+    for event in multi_spindle_g76
+):
+    raise SystemExit("missing source-linked G76 selected-spindle final threading pass")
+
 threading_cycle = json.loads((OUTPUT_DIR / "cnc_sim_linuxcnc_source_threading_cycle.json").read_text())
 if not any(
     event["type"] == "comment" and
@@ -3747,6 +3774,7 @@ echo "dumped $output_dir/cnc_sim_linuxcnc_source_modal_state.json"
 echo "dumped $output_dir/cnc_sim_linuxcnc_source_modal_autorestore.json"
 echo "dumped $output_dir/cnc_sim_linuxcnc_source_threading_sync.json"
 echo "dumped $output_dir/cnc_sim_linuxcnc_source_threading_cycle.json"
+echo "dumped $output_dir/cnc_sim_linuxcnc_source_multi_spindle_g76.json"
 echo "dumped $output_dir/cnc_sim_linuxcnc_source_lathe_diameter_mode.json"
 echo "dumped $output_dir/cnc_sim_linuxcnc_source_lathe_diameter_g76.json"
 echo "dumped $output_dir/cnc_sim_linuxcnc_source_tool_number.json"
diff --git a/tests/gcode/linuxcnc_multi_spindle_g76.ngc b/tests/gcode/linuxcnc_multi_spindle_g76.ngc
new file mode 100644
index 0000000..a6030ca
--- /dev/null
+++ b/tests/gcode/linuxcnc_multi_spindle_g76.ngc
@@ -0,0 +1,7 @@
+G20 G90 G18
+(Source basis: LinuxCNC src/emc/rs274ngc/rs274ngc_pre.cc init reads [TRAJ] SPINDLES from INI_FILE_NAME.)
+(Source basis: LinuxCNC src/emc/rs274ngc/interp_convert.cc G76 with $ selects active_spindle before convert_threading_cycle.)
+S500 M3 $1
+G0 X1 Z0.1
+G76 P0.05 Z-1 I-.075 J0.008 K0.045 Q29.5 L2 E0.045 $1
+M30