URL:
<https://savannah.gnu.org/bugs/?59399>
Summary: Expanding implicit macros in gmake (enhancement
request)
Project: make
Submitted by: schily
Submitted on: Mon 02 Nov 2020 01:36:37 PM UTC
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: None
Operating System: None
Fixed Release: None
Triage Status: None
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Details:
POSIX mentions that the special make macros '$*' and '$<' only need to be
defined with implicit rules.
smake for this reason and because it's internal structure does not allow it,
does not expand $* or $< and prints a warning if these macros are encountered
in explicit rules.
SunPro Make expands these implicit macros, using an internal algorithm.
gmake also expands these implicit macros but uses a completely different
algorithm to get the values that by chance may give the same result as you get
from SunPro Make, but this may differ.
How about adding a warning to gmake if these macros are encountered with
explicit rules in order to warn users that they are writing or using a
non-portable makefile?
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