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Clean up compilation warnings coming from PL/Perl with clang-12~ 

clang-12 has introduced -Wcompound-token-split-by-macro, that is causing
a large amount of warnings when building PL/Perl because of its
interactions with upstream Perl.  This commit adds one -Wno to CFLAGS at
./configure time if the flag is supported by the compiler to silence all
those warnings.

This back-patches commit 9ff47ea41 into out-of-support branches,
pursuant to newly-established project policy.  The point is to
suppress scary-looking warnings so that people building these
branches needn't expend brain cells verifying that it's safe
to ignore the warnings.

Discussion: https://postgr.es/m/d0316012-ece7-7b7e-2d36-9c38cb77cb3b@enterprisedb.com
This commit is contained in:
Tom Lane 2021-12-12 18:05:59 -05:00
parent a4116b8d5a
commit c16a78147c
2 changed files with 50 additions and 0 deletions
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42
configure vendored
View File

@ -4790,6 +4790,48 @@ fi
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-unused-command-line-argument"
fi
# Remove clang 12+'s compound-token-split-by-macro, as this causes a lot
# of warnings when building plperl because of Perl. Like previously, test
# for the positive form and add the negative form
NOT_THE_CFLAGS=""
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wcompound-token-split-by-macro" >&5
$as_echo_n "checking whether $CC supports -Wcompound-token-split-by-macro... " >&6; }
if ${pgac_cv_prog_cc_cflags__Wcompound_token_split_by_macro+:} false; then :
$as_echo_n "(cached) " >&6
else
pgac_save_CFLAGS=$CFLAGS
CFLAGS="$pgac_save_CFLAGS -Wcompound-token-split-by-macro"
ac_save_c_werror_flag=$ac_c_werror_flag
ac_c_werror_flag=yes
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv_prog_cc_cflags__Wcompound_token_split_by_macro=yes
else
pgac_cv_prog_cc_cflags__Wcompound_token_split_by_macro=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
ac_c_werror_flag=$ac_save_c_werror_flag
CFLAGS="$pgac_save_CFLAGS"
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_cc_cflags__Wcompound_token_split_by_macro" >&5
$as_echo "$pgac_cv_prog_cc_cflags__Wcompound_token_split_by_macro" >&6; }
if test x"$pgac_cv_prog_cc_cflags__Wcompound_token_split_by_macro" = x"yes"; then
NOT_THE_CFLAGS="${NOT_THE_CFLAGS} -Wcompound-token-split-by-macro"
fi
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-compound-token-split-by-macro"
fi
# Similarly disable useless truncation warnings from gcc 8+
NOT_THE_CFLAGS=""
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -Wformat-truncation" >&5

8
configure.in
View File

@ -464,6 +464,14 @@ if test "$GCC" = yes -a "$ICC" = no; then
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-unused-command-line-argument"
fi
# Remove clang 12+'s compound-token-split-by-macro, as this causes a lot
# of warnings when building plperl because of Perl. Like previously, test
# for the positive form and add the negative form
NOT_THE_CFLAGS=""
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wcompound-token-split-by-macro])
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-compound-token-split-by-macro"
fi
# Similarly disable useless truncation warnings from gcc 8+
NOT_THE_CFLAGS=""
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wformat-truncation])