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Commit416e3e3

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Use -Wno-format-truncation and -Wno-stringop-truncation, if available.
gcc 8 has started emitting some warnings that are largely useless forour purposes, particularly since they complain about code followingthe project-standard coding convention that path names are assumedto be shorter than MAXPGPATH. Even if we make the effort to removethat assumption in some future release, the changes wouldn't getback-patched. Hence, just suppress these warnings, on compilers thathave these switches.Backpatch to all supported branches.Discussion:https://postgr.es/m/1524563856.26306.9.camel@gunduz.org
1 parent8c92485 commit416e3e3

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2 files changed

+92
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lines changed

2 files changed

+92
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‎configure

Lines changed: 80 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -4833,6 +4833,7 @@ fi
48334833
# We want to suppress clang's unhelpful unused-command-line-argument warnings
48344834
# but gcc won't complain about unrecognized -Wno-foo switches, so we have to
48354835
# test for the positive form and if that works, add the negative form
4836+
NOT_THE_CFLAGS=""
48364837
{$as_echo"$as_me:${as_lineno-$LINENO}: checking whether$CC supports -Wunused-command-line-argument">&5
48374838
$as_echo_n"checking whether$CC supports -Wunused-command-line-argument...">&6; }
48384839
if${pgac_cv_prog_cc_cflags__Wunused_command_line_argument+:}false;then:
@@ -4871,6 +4872,85 @@ fi
48714872
iftest -n"$NOT_THE_CFLAGS";then
48724873
CFLAGS="$CFLAGS -Wno-unused-command-line-argument"
48734874
fi
4875+
# Similarly disable useless truncation warnings from gcc 8+
4876+
NOT_THE_CFLAGS=""
4877+
{$as_echo"$as_me:${as_lineno-$LINENO}: checking whether$CC supports -Wformat-truncation">&5
4878+
$as_echo_n"checking whether$CC supports -Wformat-truncation...">&6; }
4879+
if${pgac_cv_prog_cc_cflags__Wformat_truncation+:}false;then:
4880+
$as_echo_n"(cached)">&6
4881+
else
4882+
pgac_save_CFLAGS=$CFLAGS
4883+
CFLAGS="$pgac_save_CFLAGS -Wformat-truncation"
4884+
ac_save_c_werror_flag=$ac_c_werror_flag
4885+
ac_c_werror_flag=yes
4886+
cat confdefs.h -<<_ACEOF >conftest.$ac_ext
4887+
/* end confdefs.h. */
4888+
4889+
int
4890+
main ()
4891+
{
4892+
4893+
;
4894+
return 0;
4895+
}
4896+
_ACEOF
4897+
if ac_fn_c_try_compile"$LINENO";then:
4898+
pgac_cv_prog_cc_cflags__Wformat_truncation=yes
4899+
else
4900+
pgac_cv_prog_cc_cflags__Wformat_truncation=no
4901+
fi
4902+
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4903+
ac_c_werror_flag=$ac_save_c_werror_flag
4904+
CFLAGS="$pgac_save_CFLAGS"
4905+
fi
4906+
{$as_echo"$as_me:${as_lineno-$LINENO}: result:$pgac_cv_prog_cc_cflags__Wformat_truncation">&5
4907+
$as_echo"$pgac_cv_prog_cc_cflags__Wformat_truncation">&6; }
4908+
iftest x"$pgac_cv_prog_cc_cflags__Wformat_truncation" = x"yes";then
4909+
NOT_THE_CFLAGS="${NOT_THE_CFLAGS} -Wformat-truncation"
4910+
fi
4911+
4912+
iftest -n"$NOT_THE_CFLAGS";then
4913+
CFLAGS="$CFLAGS -Wno-format-truncation"
4914+
fi
4915+
NOT_THE_CFLAGS=""
4916+
{$as_echo"$as_me:${as_lineno-$LINENO}: checking whether$CC supports -Wstringop-truncation">&5
4917+
$as_echo_n"checking whether$CC supports -Wstringop-truncation...">&6; }
4918+
if${pgac_cv_prog_cc_cflags__Wstringop_truncation+:}false;then:
4919+
$as_echo_n"(cached)">&6
4920+
else
4921+
pgac_save_CFLAGS=$CFLAGS
4922+
CFLAGS="$pgac_save_CFLAGS -Wstringop-truncation"
4923+
ac_save_c_werror_flag=$ac_c_werror_flag
4924+
ac_c_werror_flag=yes
4925+
cat confdefs.h -<<_ACEOF >conftest.$ac_ext
4926+
/* end confdefs.h. */
4927+
4928+
int
4929+
main ()
4930+
{
4931+
4932+
;
4933+
return 0;
4934+
}
4935+
_ACEOF
4936+
if ac_fn_c_try_compile"$LINENO";then:
4937+
pgac_cv_prog_cc_cflags__Wstringop_truncation=yes
4938+
else
4939+
pgac_cv_prog_cc_cflags__Wstringop_truncation=no
4940+
fi
4941+
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4942+
ac_c_werror_flag=$ac_save_c_werror_flag
4943+
CFLAGS="$pgac_save_CFLAGS"
4944+
fi
4945+
{$as_echo"$as_me:${as_lineno-$LINENO}: result:$pgac_cv_prog_cc_cflags__Wstringop_truncation">&5
4946+
$as_echo"$pgac_cv_prog_cc_cflags__Wstringop_truncation">&6; }
4947+
iftest x"$pgac_cv_prog_cc_cflags__Wstringop_truncation" = x"yes";then
4948+
NOT_THE_CFLAGS="${NOT_THE_CFLAGS} -Wstringop-truncation"
4949+
fi
4950+
4951+
iftest -n"$NOT_THE_CFLAGS";then
4952+
CFLAGS="$CFLAGS -Wno-stringop-truncation"
4953+
fi
48744954
eliftest"$ICC" = yes;then
48754955
# Intel's compiler has a bug/misoptimization in checking for
48764956
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.

‎configure.in

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -468,10 +468,22 @@ if test "$GCC" = yes -a "$ICC" = no; then
468468
# We want to suppress clang's unhelpful unused-command-line-argument warnings
469469
# but gcc won't complain about unrecognized -Wno-foo switches, so we have to
470470
# test for the positive form and if that works, add the negative form
471+
NOT_THE_CFLAGS=""
471472
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wunused-command-line-argument])
472473
if test -n "$NOT_THE_CFLAGS"; then
473474
CFLAGS="$CFLAGS -Wno-unused-command-line-argument"
474475
fi
476+
# Similarly disable useless truncation warnings from gcc 8+
477+
NOT_THE_CFLAGS=""
478+
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wformat-truncation])
479+
if test -n "$NOT_THE_CFLAGS"; then
480+
CFLAGS="$CFLAGS -Wno-format-truncation"
481+
fi
482+
NOT_THE_CFLAGS=""
483+
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wstringop-truncation])
484+
if test -n "$NOT_THE_CFLAGS"; then
485+
CFLAGS="$CFLAGS -Wno-stringop-truncation"
486+
fi
475487
elif test "$ICC" = yes; then
476488
# Intel's compiler has a bug/misoptimization in checking for
477489
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.

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