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Commit378f599

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committed
Fix CFLAGS selection to actually work. Add test to detect whether gcc's
option -fno-strict-aliasing is available.
1 parent6db0a6b commit378f599

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12 files changed

+144
-53
lines changed

12 files changed

+144
-53
lines changed

‎config/c-compiler.m4

Lines changed: 31 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
# Macros to detect C compiler features
2-
# $Header: /cvsroot/pgsql/config/c-compiler.m4,v 1.8 2003/04/24 21:16:42 tgl Exp $
2+
# $Header: /cvsroot/pgsql/config/c-compiler.m4,v 1.9 2003/10/25 15:32:11 petere Exp $
33

44

55
# PGAC_C_SIGNED
@@ -97,7 +97,7 @@ AC_DEFINE_UNQUOTED(AS_TR_CPP(alignof_$1),
9797

9898

9999
# PGAC_C_FUNCNAME_SUPPORT
100-
# -------------
100+
# -----------------------
101101
# Check if the C compiler understands __func__ (C99) or __FUNCTION__ (gcc).
102102
# Define HAVE_FUNCNAME__FUNC or HAVE_FUNCNAME__FUNCTION accordingly.
103103
AC_DEFUN([PGAC_C_FUNCNAME_SUPPORT],
@@ -120,3 +120,32 @@ AC_DEFINE(HAVE_FUNCNAME__FUNCTION, 1,
120120
[Define to 1 if your compiler understands __FUNCTION__.])
121121
fi
122122
fi])# PGAC_C_FUNCNAME_SUPPORT
123+
124+
125+
# PGAC_PROG_CC_NO_STRICT_ALIASING
126+
# -------------------------------
127+
# Find out how to turn off strict aliasing in the C compiler.
128+
AC_DEFUN([PGAC_PROG_CC_NO_STRICT_ALIASING],
129+
[AC_CACHE_CHECK([how to turn off strict aliasing in $CC],
130+
pgac_cv_prog_cc_no_strict_aliasing,
131+
[pgac_save_CFLAGS=$CFLAGS
132+
if test "$GCC" = yes; then
133+
pgac_try="-fno-strict-aliasing"
134+
else
135+
# Maybe fill in later...
136+
pgac_try=
137+
fi
138+
139+
for pgac_flag in $pgac_try; do
140+
CFLAGS="$pgac_save_CFLAGS $pgac_flag"
141+
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
142+
[pgac_cv_prog_cc_no_strict_aliasing=$pgac_try
143+
break])
144+
done
145+
146+
CFLAGS=$pgac_save_CFLAGS
147+
])
148+
149+
if test "$ac_env_CFLAGS_set" != set; then
150+
CFLAGS="$CFLAGS $pgac_cv_prog_cc_no_strict_aliasing"
151+
fi])# PGAC_PROG_CC_NO_STRICT_ALIASING

‎configure

Lines changed: 83 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -841,7 +841,7 @@ Optional Features:
841841
--enable-nls[=LANGUAGES] enable Native Language Support
842842
--disable-shared do not build shared libraries
843843
--disable-rpath do not embed shared library search path in executables
844-
--disable-spinlocks do not useSpinlocks
844+
--disable-spinlocks do not usespinlocks
845845
--enable-debug build with debugging symbols (-g)
846846
--enable-depend turn on automatic dependency tracking
847847
--enable-cassert enable assertion checks (for debugging)
@@ -2384,40 +2384,105 @@ ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $
23842384
ac_compiler_gnu=$ac_cv_c_compiler_gnu
23852385

23862386

2387+
pgac_CFLAGS_before_template=$CFLAGS
2388+
23872389
#
23882390
# Read the template
23892391
#
23902392
. "$srcdir/src/template/$template" || exit
23912393

2392-
# The template may have supplied a default setting for CFLAGS.
2393-
# Override this if CFLAGS was set in the original environment.
2394+
# CFLAGS are selected so:
2395+
# If the user specifies something in the environment, that is used.
2396+
# else: If the template file set something, that is used.
2397+
# else: If the compiler is GCC, then we use -O2.
2398+
# else: If the compiler is something else, then we use -0.
2399+
23942400
if test "$ac_env_CFLAGS_set" = set; then
23952401
CFLAGS=$ac_env_CFLAGS_value
2402+
elif test "$pgac_CFLAGS_before_template" != "$CFLAGS"; then
2403+
: # (keep what template set)
2404+
elif test "$GCC" = yes; then
2405+
CFLAGS="-O2"
23962406
else
2397-
# autoconf already set the default CFLAGS for gcc to be -O2, but we
2398-
# need to specify -fno-strict-aliasing too in case it's gcc 3.3 or later.
2399-
if test "$GCC" = yes; then
2400-
CFLAGS="$CFLAGS -fno-strict-aliasing"
2401-
fi
2407+
CFLAGS="-O"
2408+
fi
2409+
2410+
# Need to specify -fno-strict-aliasing too in case it's gcc 3.3 or later.
2411+
echo "$as_me:$LINENO: checking how to turn off strict aliasing in $CC" >&5
2412+
echo $ECHO_N "checking how to turn off strict aliasing in $CC... $ECHO_C" >&6
2413+
if test "${pgac_cv_prog_cc_no_strict_aliasing+set}" = set; then
2414+
echo $ECHO_N "(cached) $ECHO_C" >&6
2415+
else
2416+
pgac_save_CFLAGS=$CFLAGS
2417+
if test "$GCC" = yes; then
2418+
pgac_try="-fno-strict-aliasing"
2419+
else
2420+
# Maybe fill in later...
2421+
pgac_try=
2422+
fi
2423+
2424+
for pgac_flag in $pgac_try; do
2425+
CFLAGS="$pgac_save_CFLAGS $pgac_flag"
2426+
cat >conftest.$ac_ext <<_ACEOF
2427+
#line $LINENO "configure"
2428+
#include "confdefs.h"
2429+
2430+
#ifdef F77_DUMMY_MAIN
2431+
# ifdef __cplusplus
2432+
extern "C"
2433+
# endif
2434+
int F77_DUMMY_MAIN() { return 1; }
2435+
#endif
2436+
int
2437+
main ()
2438+
{
2439+
2440+
;
2441+
return 0;
2442+
}
2443+
_ACEOF
2444+
rm -f conftest.$ac_objext
2445+
if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
2446+
(eval $ac_compile) 2>&5
2447+
ac_status=$?
2448+
echo "$as_me:$LINENO: \$? = $ac_status" >&5
2449+
(exit $ac_status); } &&
2450+
{ ac_try='test -s conftest.$ac_objext'
2451+
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
2452+
(eval $ac_try) 2>&5
2453+
ac_status=$?
2454+
echo "$as_me:$LINENO: \$? = $ac_status" >&5
2455+
(exit $ac_status); }; }; then
2456+
pgac_cv_prog_cc_no_strict_aliasing=$pgac_try
2457+
break
2458+
else
2459+
echo "$as_me: failed program was:" >&5
2460+
cat conftest.$ac_ext >&5
2461+
fi
2462+
rm -f conftest.$ac_objext conftest.$ac_ext
2463+
done
2464+
2465+
CFLAGS=$pgac_save_CFLAGS
2466+
24022467
fi
2468+
echo "$as_me:$LINENO: result: $pgac_cv_prog_cc_no_strict_aliasing" >&5
2469+
echo "${ECHO_T}$pgac_cv_prog_cc_no_strict_aliasing" >&6
2470+
2471+
if test "$ac_env_CFLAGS_set" != set; then
2472+
CFLAGS="$CFLAGS $pgac_cv_prog_cc_no_strict_aliasing"
2473+
fi
2474+
24032475
# supply -g if --enable-debug
24042476
if test "$enable_debug" = yes -a "$ac_cv_prog_cc_g" = yes; then
24052477
CFLAGS="$CFLAGS -g"
24062478
fi
2407-
# default to -O rather than empty CFLAGS; this path will not be taken for
2408-
# gcc (since autoconf supplies -O2), nor if --enable-debug (because -O -g
2409-
# doesn't work on most non-gcc compilers), nor if the template provided
2410-
# some CFLAGS.
2411-
if test "$ac_env_CFLAGS_set" != set -a x"$CFLAGS" = x""; then
2412-
CFLAGS="-O"
2413-
fi
2479+
24142480
{ echo "$as_me:$LINENO: using CFLAGS=$CFLAGS" >&5
24152481
echo "$as_me: using CFLAGS=$CFLAGS" >&6;}
24162482

24172483
# We already have this in Makefile.win32, but configure needs it too
2418-
if test "$PORTNAME" = "win32"
2419-
then
2420-
CPPFLAGS="$CPPFLAGS -I$srcdir/src/include/port/win32"
2484+
if test "$PORTNAME" = "win32"; then
2485+
CPPFLAGS="$CPPFLAGS -I$srcdir/src/include/port/win32"
24212486
fi
24222487

24232488
# Check if the compiler still works with the template settings

‎configure.in

Lines changed: 22 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
dnl Process this file with autoconf to produce a configure script.
2-
dnl $Header: /cvsroot/pgsql/configure.in,v 1.297 2003/10/22 04:16:39 pgsql Exp $
2+
dnl $Header: /cvsroot/pgsql/configure.in,v 1.298 2003/10/25 15:32:11 petere Exp $
33
dnl
44
dnl Developers, please strive to achieve this order:
55
dnl
@@ -203,7 +203,7 @@ AC_SUBST(enable_rpath)
203203
# Spinlocks
204204
#
205205
PGAC_ARG_BOOL(enable, spinlocks, yes,
206-
[ --disable-spinlocks do not useSpinlocks])
206+
[ --disable-spinlocks do not usespinlocks])
207207

208208
#
209209
# --enable-debug adds -g to compiler flags
@@ -229,39 +229,42 @@ esac
229229

230230
AC_PROG_CC([$pgac_cc_list])
231231

232+
pgac_CFLAGS_before_template=$CFLAGS
233+
232234
#
233235
# Read the template
234236
#
235237
. "$srcdir/src/template/$template" || exit
236238

237-
# The template may have supplied a default setting for CFLAGS.
238-
# Override this if CFLAGS was set in the original environment.
239+
# CFLAGS are selected so:
240+
# If the user specifies something in the environment, that is used.
241+
# else: If the template file set something, that is used.
242+
# else: If the compiler is GCC, then we use -O2.
243+
# else: If the compiler is something else, then we use -0.
244+
239245
if test "$ac_env_CFLAGS_set" = set; then
240246
CFLAGS=$ac_env_CFLAGS_value
247+
elif test "$pgac_CFLAGS_before_template" != "$CFLAGS"; then
248+
: # (keep what template set)
249+
elif test "$GCC" = yes; then
250+
CFLAGS="-O2"
241251
else
242-
# autoconf already set the default CFLAGS for gcc to be -O2, but we
243-
# need to specify -fno-strict-aliasing too in case it's gcc 3.3 or later.
244-
if test "$GCC" = yes; then
245-
CFLAGS="$CFLAGS -fno-strict-aliasing"
246-
fi
252+
CFLAGS="-O"
247253
fi
254+
255+
# Need to specify -fno-strict-aliasing too in case it's gcc 3.3 or later.
256+
PGAC_PROG_CC_NO_STRICT_ALIASING
257+
248258
# supply -g if --enable-debug
249259
if test "$enable_debug" = yes -a "$ac_cv_prog_cc_g" = yes; then
250260
CFLAGS="$CFLAGS -g"
251261
fi
252-
# default to -O rather than empty CFLAGS; this path will not be taken for
253-
# gcc (since autoconf supplies -O2), nor if --enable-debug (because -O -g
254-
# doesn't work on most non-gcc compilers), nor if the template provided
255-
# some CFLAGS.
256-
if test "$ac_env_CFLAGS_set" != set -a x"$CFLAGS" = x""; then
257-
CFLAGS="-O"
258-
fi
262+
259263
AC_MSG_NOTICE([using CFLAGS=$CFLAGS])
260264

261265
# We already have this in Makefile.win32, but configure needs it too
262-
if test "$PORTNAME" = "win32"
263-
then
264-
CPPFLAGS="$CPPFLAGS -I$srcdir/src/include/port/win32"
266+
if test "$PORTNAME" = "win32"; then
267+
CPPFLAGS="$CPPFLAGS -I$srcdir/src/include/port/win32"
265268
fi
266269

267270
# Check if the compiler still works with the template settings

‎src/template/aix

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
11
if test "$GCC" != yes ; then
22
case $host_os in
33
aix3.2.5 | aix4.1*) ;;
4-
*) CFLAGS="$CFLAGS-O2 -qlonglong";;
4+
*) CFLAGS="-O2 -qlonglong";;
55
esac
6-
CFLAGS="$CFLAGS -qmaxmem=16384 -qsrcmsg"
6+
CFLAGS="-O -qmaxmem=16384 -qsrcmsg"
77
fi

‎src/template/bsdi

Lines changed: 0 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,3 @@
1-
case $host_cpu in
2-
i?86) CFLAGS="$CFLAGS -m486";;
3-
esac
4-
51
case $host_os in
62
bsdi2.0 | bsdi2.1 | bsdi3*) CC=gcc2;;
73
esac

‎src/template/freebsd

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
case $host_cpu in
2-
alpha*) CFLAGS="$CFLAGS-O";; # alpha has problems with -O2
2+
alpha*) CFLAGS="-O";; # alpha has problems with -O2
33
esac
44

55
THREAD_SUPPORT=yes

‎src/template/hpux

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2,5 +2,5 @@ CPPFLAGS="-D_XOPEN_SOURCE_EXTENDED"
22

33
if test "$GCC" != yes ; then
44
CC="$CC -Ae"
5-
CFLAGS="$CFLAGS+O2"
5+
CFLAGS="+O2"
66
fi

‎src/template/osf

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
11
if test "$GCC" != yes ; then
22
CC="$CC -std"
3-
CFLAGS="$CFLAGS-O4 -Olimit 2000"
3+
CFLAGS="-O4 -Olimit 2000"
44
fi
55

66
THREAD_SUPPORT=yes

‎src/template/qnx4

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,2 +1 @@
1-
CFLAGS="$CFLAGS -I/usr/local/include"
21
LIBS="-lunix"

‎src/template/solaris

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,9 +1,8 @@
11
if test "$GCC" != yes ; then
22
CC="$CC -Xa"# relaxed ISO C mode
3-
CFLAGS="$CFLAGS-O -v"# -v is like gcc -Wall
3+
CFLAGS="-O -v"# -v is like gcc -Wall
44
fi
55

66
THREAD_SUPPORT=yes
77
NEED_REENTRANT_FUNCS=yes# 5.6 2003-09-13
88
THREAD_LIBS="-pthread"
9-

‎src/template/univel

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,2 +1,2 @@
1-
CFLAGS="$CFLAGS-v -O -K i486,host,inline,loop_unroll -Dsvr4"
1+
CFLAGS="-v -O -K i486,host,inline,loop_unroll -Dsvr4"
22
LIBS="-lc89"

‎src/template/unixware

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@ else
44
# the -Kno_host is temporary for a bug in the compiler. See -hackers
55
# discussion on 7-8/Aug/2003.
66
# when the 7.1.3UP3 or later compiler is out, we can do a version check.
7-
CFLAGS="$CFLAGS-O -Kinline,no_host"
7+
CFLAGS="-O -Kinline,no_host"
88
THREAD_CPPFLAGS="-K pthread"
99
fi
1010

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