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[bug #64393] -Wunused-parameter]
From: |
Vinícius dos Santos Oliveira |
Subject: |
[bug #64393] -Wunused-parameter] |
Date: |
Fri, 7 Jul 2023 22:35:33 -0400 (EDT) |
URL:
<https://savannah.gnu.org/bugs/?64393>
Summary: -Wunused-parameter]
Group: gperf
Submitter: vinipsmaker
Submitted: Sat 08 Jul 2023 02:35:31 AM UTC
Category: Generated code
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Follow-up Comments:
-------------------------------------------------------
Date: Sat 08 Jul 2023 02:35:31 AM UTC By: Vinícius dos Santos Oliveira
<vinipsmaker>
I use gperf extensively across my codebase (e.g. 20 gperf invocations per
translation unit). For some of the functions, code such as the following is
generated:
gperf__src_unix_cpp_20::hash (const char *str, size_t len)
{
return len;
}
When every input string differs in size, the size itself becomes the hash
function. So far so good, but the the argument `str` is unused and lots of
warnings per file are generated which pollutes my build output considerably:
libemilua.a.p/bc2_unix.cpp:3937:43: warning: unused parameter 'str'
[-Wunused-parameter]
gperf__src_unix_cpp_20::hash (const char *str, size_t len)
^
16 warnings generated.
All warnings from this single translation unit come from gperf (I stitch
multiple gperf invocations to a single translation unit using an AWK script,
but that's not important).
I don't know why, but sometimes `len` is the unused argument. Sample output:
gperf__src_unix_cpp_17::hash (const char *str, size_t len)
{
return 0;
}
What I'd like to see is a standard header that is always included in the body
of the implementation for these functions:
(void)str;
(void)len;
This simple change will get rid of all warnings. I don't mind if the code
generation for this header is hidden behind some CLI flag. I just want to get
rid of the build warnings that distract me away from real issues in my
codebase.
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