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Force "restrict" not to be used when compiling with xlc.

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Per buildfarm animal Hornet and followup manual testing by Noah Misch,
it appears xlc miscompiles code using "restrict" in at least some
cases. Allow disabling restrict usage with FORCE_DISABLE_RESTRICT=yes
in template files, and do so for aix/xlc.

Author: Andres Freund and Tom Lane
Discussion: https://postgr.es/m/1820.1507918762@sss.pgh.pa.us
This commit is contained in:
Andres Freund 2017-10-13 11:54:59 -07:00
parent 6393613b6a
commit d133982d59
3 changed files with 14 additions and 2 deletions
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6
configure vendored
View File

@ -12466,6 +12466,10 @@ fi
# spelling it understands, because it conflicts with
# __declspec(restrict). Therefore we define pg_restrict to the
# appropriate definition, which presumably won't conflict.
#
# Allow platforms with buggy compilers to force restrict to not be
# used by setting $FORCE_DISABLE_RESTRICT=yes in the relevant
# template.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for C/C++ restrict keyword" >&5
$as_echo_n "checking for C/C++ restrict keyword... " >&6; }
if ${ac_cv_c_restrict+:} false; then :
@ -12512,7 +12516,7 @@ _ACEOF
;;
esac
if test "$ac_cv_c_restrict" = "no" ; then
if test "$ac_cv_c_restrict" = "no" -o "x$FORCE_DISABLE_RESTRICT" = "xyes"; then
pg_restrict=""
else
pg_restrict="$ac_cv_c_restrict"

6
configure.in
View File

@ -1329,8 +1329,12 @@ PGAC_TYPE_LOCALE_T
# spelling it understands, because it conflicts with
# __declspec(restrict). Therefore we define pg_restrict to the
# appropriate definition, which presumably won't conflict.
#
# Allow platforms with buggy compilers to force restrict to not be
# used by setting $FORCE_DISABLE_RESTRICT=yes in the relevant
# template.
AC_C_RESTRICT
if test "$ac_cv_c_restrict" = "no" ; then
if test "$ac_cv_c_restrict" = "no" -o "x$FORCE_DISABLE_RESTRICT" = "xyes"; then
pg_restrict=""
else
pg_restrict="$ac_cv_c_restrict"

4
src/template/aix
View File

@ -10,6 +10,10 @@ if test "$GCC" != yes ; then
CFLAGS="-O2 -qmaxmem=16384 -qsrcmsg"
;;
esac
# Due to a compiler bug, see 20171013023536.GA492146@rfd.leadboat.com for details,
# force restrict not to be used when compiling with xlc.
FORCE_DISABLE_RESTRICT=yes
fi
# Native memset() is faster, tested on: