Grouped Targets are not connected correctly

[vasvir]

This is a relatively new feature of GNU Make (from 2020). See here: https://www.gnu.org/software/make/manual/html_node/Multiple-Targets.html#Rules-with-Grouped-Targets

The feature is very useful when there is one command to build multiple targets and you are doing parallel builds. If you don't specify the & (grouped targets) then the same command is executed multiple times, as many the targets.

target_1 target_2 &: input
    command input # generated target_1 and target_2 in one step

Currently make2graph connects the last target node.

[vasvir]

A better Makefile

all: target_1 target_2

input_0:
	input_command_0 -t $@

target_1 target_2 &: input_0
	target_command_0 input_0 -t target_

Diff of make -nd with & on and off.

--- 0.log	2026-05-01 12:58:59.284293458 +0300
+++ 1.log	2026-05-01 12:59:24.860488830 +0300
@@ -1222,19 +1222,15 @@
 Makefile:4: update target 'input_0' due to: target does not exist
 input_command_0 -t input_0
   Successfully remade target file 'input_0'.
+  Pruning file 'input_0'.
+  Pruning file 'input_0'.
  Finished prerequisites of target file 'target_1'.
  Must remake target 'target_1'.
 Makefile:7: update target 'target_1' due to: target does not exist
 target_command_0 input_0 -t target_
  Successfully remade target file 'target_1'.
  Considering target file 'target_2'.
-  File 'target_2' does not exist.
-  Pruning file 'input_0'.
- Finished prerequisites of target file 'target_2'.
- Must remake target 'target_2'.
-Makefile:7: update target 'target_2' due to: target does not exist
-target_command_0 input_0 -t target_
- Successfully remade target file 'target_2'.
+ File 'target_2' was considered already.
 Finished prerequisites of target file 'all'.
 Must remake target 'all'.
 Successfully remade target file 'all'.

And finally here are the rendered images.

Without &

With &