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# New Ticket Created by James E Keenan
# Please include the string: [perl #132342]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt.perl.org/Ticket/Display.html?id=132342 >
When building perl with gcc-7.2, many new compiler warnings are thrown.
During and after the 2017 Perl 5 Core Hackathon, Lukas Mai and Yves
Orton committed code to silence most of these warnings. Today I built
with gcc-7.2 on Ubuntu Linux 16.04 LTS for the first time. The warnings
I got are displayed in this smoke test report:
http://perl5.test-smoke.org/report/58805
Those warnings come from these files:
#####
stadtx_hash.h
op.c
cpan/Compress-Raw-Bzip2/bzip2-src/decompress.c
cpan/Compress-Raw-Zlib/zlib-src/infback.c
cpan/Compress-Raw-Zlib/zlib-src/inflate.c
cpan/Encode/Unicode/Unicode.xs
cpan/Scalar-List-Utils/ListUtil.xs
#####
The patch attached silences the 'warning: this statement may fall
through [-Wimplicit-fallthrough=]' warnings in stadtx_hash.h. Those
warnings appear in most of the other files, but those are maintained
upstream (for which I will later supply patches).
The following warning remains during a gcc-7.2 build:
#####
op.c: In function ‘S_fold_constants’:
op.c:4448:34: warning: argument ‘o’ might be clobbered by ‘longjmp’ or
‘vfork’ [-Wclobbered]
S_fold_constants(pTHX_ OP *const o)
^
#####
I don't yet know how to address that one.
Please review the patch.
Thank you very much.
Jim Keenan
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