8000 Disable -Wdeprecated-non-prototype in the back branches. · postgres/postgres@5d3ce0d · GitHub
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Disable -Wdeprecated-non-prototype in the back branches.
There doesn't seem to be any good ABI-preserving way to silence clang 15's -Wdeprecated-non-prototype warnings about our tree-walk APIs. While we've fixed it properly in HEAD, the only way to not see hundreds of these in the back branches is to disable the warnings. We're not going to do anything about them, so we might as well disable them. I noticed that we also get some of these warnings about fmgr.c's support for V0 function call convention, in branches before v10 where we removed that. That's another area we aren't going to change, so turning off the warning seems fine for that too. Per project policy, this is a candidate for back-patching into out-of-support branches: it suppresses annoying compiler warnings but changes no behavior. Hence, back-patch all the way to 9.2. Discussion: https://postgr.es/m/CA+hUKGKpHPDTv67Y+s6yiC8KH5OXeDg6a-twWo_xznKTcG0kSA@mail.gmail.com
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‎configure

Lines changed: 66 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -4541,6 +4541,72 @@ fi
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if test -n "$NOT_THE_CFLAGS"; then
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CFLAGS="$CFLAGS -Wno-compound-token-split-by-macro"
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fi
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# Similarly remove clang 15+'s deprecated-non-prototype, as it warns about
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# tree-walking APIs that we can't reasonably change in the back branches.
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NOT_THE_CFLAGS=""
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{ $as_echo "$as_me:$LINENO: checking whether $CC supports -Wdeprecated-non-prototype" >&5
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$as_echo_n "checking whether $CC supports -Wdeprecated-non-prototype... " >&6; }
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if test "${pgac_cv_prog_cc_cflags__Wdeprecated_non_prototype+set}" = set; then
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$as_echo_n "(cached) " >&6
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else
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pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS -Wdeprecated-non-prototype"
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ac_save_c_werror_flag=$ac_c_werror_flag
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ac_c_werror_flag=yes
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (ac_try="$ac_compile"
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case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
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$as_echo "$ac_try_echo") >&5
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(eval "$ac_compile") 2>conftest.er1
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ac_status=$?
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grep -v '^ *+' conftest.er1 >conftest.err
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rm -f conftest.er1
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cat conftest.err >&5
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$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } && {
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test -z "$ac_c_werror_flag" ||
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test ! -s conftest.err
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} && test -s conftest.$ac_objext; then
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pgac_cv_prog_cc_cflags__Wdeprecated_non_prototype=yes
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else
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$as_echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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pgac_cv_prog_cc_cflags__Wdeprecated_non_prototype=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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ac_c_werror_flag=$ac_save_c_werror_flag
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CFLAGS="$pgac_save_CFLAGS"
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fi
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{ $as_echo "$as_me:$LINENO: result: $pgac_cv_prog_cc_cflags__Wdeprecated_non_prototype" >&5
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$as_echo "$pgac_cv_prog_cc_cflags__Wdeprecated_non_prototype" >&6; }
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if test x"$pgac_cv_prog_cc_cflags__Wdeprecated_non_prototype" = x"yes"; then
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NOT_THE_CFLAGS="${NOT_THE_CFLAGS} -Wdeprecated-non-prototype"
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fi
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if test -n "$NOT_THE_CFLAGS"; then
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CFLAGS="$CFLAGS -Wno-deprecated-non-prototype"
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fi
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# Similarly disable useless truncation warnings from gcc 8+
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NOT_THE_CFLAGS=""
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{ $as_echo "$as_me:$LINENO: checking whether $CC supports -Wformat-truncation" >&5

‎configure.in

Lines changed: 7 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -442,6 +442,13 @@ if test "$GCC" = yes -a "$ICC" = no; then
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if test -n "$NOT_THE_CFLAGS"; then
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CFLAGS="$CFLAGS -Wno-compound-token-split-by-macro"
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fi
445+
# Similarly remove clang 15+'s deprecated-non-prototype, as it warns about
446+
# tree-walking APIs that we can't reasonably change in the back branches.
447+
NOT_THE_CFLAGS=""
448+
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wdeprecated-non-prototype])
449+
if test -n "$NOT_THE_CFLAGS"; then
450+
CFLAGS="$CFLAGS -Wno-deprecated-non-prototype"
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fi
445452
# Similarly disable useless truncation warnings from gcc 8+
446453
NOT_THE_CFLAGS=""
447454
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wformat-truncation])

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