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      1 # $NetBSD: varname-make_stack_trace.mk,v 1.1 2025/06/13 03:51:18 rillig Exp $
      2 #
      3 # Tests for the MAKE_STACK_TRACE environment variable, which controls whether
      4 # to print inter-process stack traces that are useful to narrow down where an
      5 # erroneous expression comes from.
      6 #
      7 # While inter-process stack traces are useful to narrow down errors, they are
      8 # disabled by default since the stack trace is stored in an environment
      9 # variable and a stack trace can grow large depending on the shell commands in
     10 # the sub-make processes.  The space used for the stack traces would compete
     11 # with the space for the command line arguments, and long command lines are
     12 # already written to a temporary file by Cmd_Exec to not overwhelm this space.
     13 
     14 all: .PHONY
     15 	@${MAKE} -f ${MAKEFILE} disabled-compat || :
     16 	@${MAKE} -f ${MAKEFILE} -j1 disabled-parallel || :
     17 	@MAKE_STACK_TRACE=yes ${MAKE} -f ${MAKEFILE} enabled-compat || :
     18 	@MAKE_STACK_TRACE=yes ${MAKE} -f ${MAKEFILE} -j1 enabled-parallel || :
     19 
     20 # expect-not: in target "disabled-compat"
     21 disabled-compat: .PHONY
     22 	@${MAKE} -f ${MAKEFILE} provoke-error
     23 
     24 # expect-not: in target "disabled-parallel"
     25 disabled-parallel: .PHONY
     26 	@${MAKE} -f ${MAKEFILE} provoke-error
     27 
     28 # expect: in target "enabled-compat"
     29 enabled-compat: .PHONY
     30 	@${MAKE} -f ${MAKEFILE} provoke-error
     31 
     32 # expect: in target "enabled-parallel"
     33 enabled-parallel: .PHONY
     34 	@${MAKE} -f ${MAKEFILE} provoke-error
     35 
     36 provoke-error: .PHONY
     37 	@echo ${:Z}
     38