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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 for
our purposes, particularly since they complain about code following
the project-standard coding convention that path names are assumed
to be shorter than MAXPGPATH.  Even if we make the effort to remove
that assumption in some future release, the changes wouldn't get
back-patched.  Hence, just suppress these warnings, on compilers that
have these switches.

Backpatch to all supported branches.

Discussion: https://postgr.es/m/1524563856.26306.9.camel@gunduz.org
This commit is contained in:
Tom Lane 2018-06-16 15:34:07 -04:00
parent 6b74f5eaad
commit e716585235
2 changed files with 100 additions and 0 deletions
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88
configure vendored
View File

@ -5815,6 +5815,7 @@ fi
# We want to suppress clang's unhelpful unused-command-line-argument warnings
# but gcc won't complain about unrecognized -Wno-foo switches, so we have to
# test for the positive form and if that works, add the negative form
NOT_THE_CFLAGS=""
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether ${CC} supports -Wunused-command-line-argument, for NOT_THE_CFLAGS" >&5
$as_echo_n "checking whether ${CC} supports -Wunused-command-line-argument, for NOT_THE_CFLAGS... " >&6; }
if ${pgac_cv_prog_CC_cflags__Wunused_command_line_argument+:} false; then :
@ -5857,6 +5858,93 @@ fi
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-unused-command-line-argument"
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, for NOT_THE_CFLAGS" >&5
$as_echo_n "checking whether ${CC} supports -Wformat-truncation, for NOT_THE_CFLAGS... " >&6; }
if ${pgac_cv_prog_CC_cflags__Wformat_truncation+:} false; then :
$as_echo_n "(cached) " >&6
else
pgac_save_CFLAGS=$CFLAGS
pgac_save_CC=$CC
CC=${CC}
CFLAGS="${NOT_THE_CFLAGS} -Wformat-truncation"
ac_save_c_werror_flag=$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__Wformat_truncation=yes
else
pgac_cv_prog_CC_cflags__Wformat_truncation=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"
CC="$pgac_save_CC"
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_CC_cflags__Wformat_truncation" >&5
$as_echo "$pgac_cv_prog_CC_cflags__Wformat_truncation" >&6; }
if test x"$pgac_cv_prog_CC_cflags__Wformat_truncation" = x"yes"; then
NOT_THE_CFLAGS="${NOT_THE_CFLAGS} -Wformat-truncation"
fi
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-format-truncation"
fi
NOT_THE_CFLAGS=""
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether ${CC} supports -Wstringop-truncation, for NOT_THE_CFLAGS" >&5
$as_echo_n "checking whether ${CC} supports -Wstringop-truncation, for NOT_THE_CFLAGS... " >&6; }
if ${pgac_cv_prog_CC_cflags__Wstringop_truncation+:} false; then :
$as_echo_n "(cached) " >&6
else
pgac_save_CFLAGS=$CFLAGS
pgac_save_CC=$CC
CC=${CC}
CFLAGS="${NOT_THE_CFLAGS} -Wstringop-truncation"
ac_save_c_werror_flag=$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__Wstringop_truncation=yes
else
pgac_cv_prog_CC_cflags__Wstringop_truncation=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"
CC="$pgac_save_CC"
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_CC_cflags__Wstringop_truncation" >&5
$as_echo "$pgac_cv_prog_CC_cflags__Wstringop_truncation" >&6; }
if test x"$pgac_cv_prog_CC_cflags__Wstringop_truncation" = x"yes"; then
NOT_THE_CFLAGS="${NOT_THE_CFLAGS} -Wstringop-truncation"
fi
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-stringop-truncation"
fi
elif test "$ICC" = yes; then
# Intel's compiler has a bug/misoptimization in checking for
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.

12
configure.in
View File

@ -498,10 +498,22 @@ if test "$GCC" = yes -a "$ICC" = no; then
# We want to suppress clang's unhelpful unused-command-line-argument warnings
# but gcc won't complain about unrecognized -Wno-foo switches, so we have to
# test for the positive form and if that works, add the negative form
NOT_THE_CFLAGS=""
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wunused-command-line-argument])
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-unused-command-line-argument"
fi
# Similarly disable useless truncation warnings from gcc 8+
NOT_THE_CFLAGS=""
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wformat-truncation])
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-format-truncation"
fi
NOT_THE_CFLAGS=""
PGAC_PROG_CC_VAR_OPT(NOT_THE_CFLAGS, [-Wstringop-truncation])
if test -n "$NOT_THE_CFLAGS"; then
CFLAGS="$CFLAGS -Wno-stringop-truncation"
fi
elif test "$ICC" = yes; then
# Intel's compiler has a bug/misoptimization in checking for
# division by NAN (NaN == 0), -mp1 fixes it, so add it to the CFLAGS.