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When using GCC, change the default CFLAGS to:
-O2 -Wall -Wmissing-prototypes -Wpointer-arith Check whether the version of GCC we are using supports any of: -Wdeclaration-after-statement -Wendif-labels -Wold-style-definition And add the supported flags to CFLAGS.
This commit is contained in:
Neil Conway
parent
a1bc728cf9
commit
857e210ea9
@ -1,5 +1,5 @@
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# Macros to detect C compiler features
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# $PostgreSQL: pgsql/config/c-compiler.m4,v 1.12 2004/02/02 04:07:18 tgl Exp $
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# $PostgreSQL: pgsql/config/c-compiler.m4,v 1.13 2004/10/20 02:12:07 neilc Exp $
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# PGAC_C_SIGNED
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@ -121,35 +121,19 @@ AC_DEFINE(HAVE_FUNCNAME__FUNCTION, 1,
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fi
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fi])# PGAC_C_FUNCNAME_SUPPORT
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# PGAC_PROG_CC_NO_STRICT_ALIASING
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# -------------------------------
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# Find out how to turn off strict aliasing in the C compiler.
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AC_DEFUN([PGAC_PROG_CC_NO_STRICT_ALIASING],
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[AC_CACHE_CHECK([how to turn off strict aliasing in $CC],
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pgac_cv_prog_cc_no_strict_aliasing,
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[pgac_save_CFLAGS=$CFLAGS
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if test "$GCC" = yes; then
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pgac_try="-fno-strict-aliasing"
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else
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# Maybe fill in later...
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pgac_try=
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fi
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for pgac_flag in $pgac_try; do
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CFLAGS="$pgac_save_CFLAGS $pgac_flag"
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_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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[pgac_cv_prog_cc_no_strict_aliasing=$pgac_try
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break])
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done
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CFLAGS=$pgac_save_CFLAGS
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])
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if test x"$pgac_cv_prog_cc_no_strict_aliasing" != x""; then
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CFLAGS="$CFLAGS $pgac_cv_prog_cc_no_strict_aliasing"
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fi])# PGAC_PROG_CC_NO_STRICT_ALIASING
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# PGAC_PROG_CC_CFLAGS_OPT
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# -----------------------
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# Given a string, check if the compiler supports the string as a
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# command-line option. If it does, add the string to CFLAGS.
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AC_DEFUN([PGAC_PROG_CC_CFLAGS_OPT],
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[AC_MSG_CHECKING([if $CC supports $1])
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pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS $1"
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_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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AC_MSG_RESULT(yes),
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[CFLAGS="$pgac_save_CFLAGS"
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AC_MSG_RESULT(no)])
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])# PGAC_PROG_CC_CFLAGS_OPT
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# The below backpatches the following Autoconf change:
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#
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170
configure
vendored
170
configure
vendored
@ -2432,23 +2432,16 @@ else
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fi
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fi
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# Need to specify -fno-strict-aliasing too in case it's gcc 3.3 or later.
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echo "$as_me:$LINENO: checking how to turn off strict aliasing in $CC" >&5
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echo $ECHO_N "checking how to turn off strict aliasing in $CC... $ECHO_C" >&6
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if test "${pgac_cv_prog_cc_no_strict_aliasing+set}" = set; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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pgac_save_CFLAGS=$CFLAGS
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if test "$GCC" = yes; then
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pgac_try="-fno-strict-aliasing"
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else
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# Maybe fill in later...
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pgac_try=
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fi
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CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith"
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for pgac_flag in $pgac_try; do
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CFLAGS="$pgac_save_CFLAGS $pgac_flag"
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cat >conftest.$ac_ext <<_ACEOF
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# Some versions of GCC support some additional useful warning flags.
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# Check whether they are supported, and add them to CFLAGS if so.
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echo "$as_me:$LINENO: checking if $CC supports -Wdeclaration-after-statement" >&5
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echo $ECHO_N "checking if $CC supports -Wdeclaration-after-statement... $ECHO_C" >&6
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pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS -Wdeclaration-after-statement"
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cat >conftest.$ac_ext <<_ACEOF
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#line $LINENO "configure"
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#include "confdefs.h"
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@ -2478,23 +2471,154 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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pgac_cv_prog_cc_no_strict_aliasing=$pgac_try
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break
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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else
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echo "$as_me: failed program was:" >&5
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cat conftest.$ac_ext >&5
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CFLAGS="$pgac_save_CFLAGS"
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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fi
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rm -f conftest.$ac_objext conftest.$ac_ext
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done
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CFLAGS=$pgac_save_CFLAGS
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echo "$as_me:$LINENO: checking if $CC supports -Wold-style-definition" >&5
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echo $ECHO_N "checking if $CC supports -Wold-style-definition... $ECHO_C" >&6
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pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS -Wold-style-definition"
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cat >conftest.$ac_ext <<_ACEOF
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#line $LINENO "configure"
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#include "confdefs.h"
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#ifdef F77_DUMMY_MAIN
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# ifdef __cplusplus
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extern "C"
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# endif
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int F77_DUMMY_MAIN() { return 1; }
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#endif
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
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(eval $ac_compile) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } &&
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{ ac_try='test -s conftest.$ac_objext'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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else
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echo "$as_me: failed program was:" >&5
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cat conftest.$ac_ext >&5
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CFLAGS="$pgac_save_CFLAGS"
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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fi
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echo "$as_me:$LINENO: result: $pgac_cv_prog_cc_no_strict_aliasing" >&5
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echo "${ECHO_T}$pgac_cv_prog_cc_no_strict_aliasing" >&6
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rm -f conftest.$ac_objext conftest.$ac_ext
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echo "$as_me:$LINENO: checking if $CC supports -Wendif-labels" >&5
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echo $ECHO_N "checking if $CC supports -Wendif-labels... $ECHO_C" >&6
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pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS -Wendif-labels"
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cat >conftest.$ac_ext <<_ACEOF
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#line $LINENO "configure"
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#include "confdefs.h"
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#ifdef F77_DUMMY_MAIN
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# ifdef __cplusplus
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extern "C"
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# endif
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int F77_DUMMY_MAIN() { return 1; }
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#endif
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
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(eval $ac_compile) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } &&
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{ ac_try='test -s conftest.$ac_objext'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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else
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echo "$as_me: failed program was:" >&5
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cat conftest.$ac_ext >&5
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CFLAGS="$pgac_save_CFLAGS"
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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fi
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rm -f conftest.$ac_objext conftest.$ac_ext
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# Disable strict-aliasing rules; needed for gcc 3.3+
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echo "$as_me:$LINENO: checking if $CC supports -fno-strict-aliasing" >&5
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echo $ECHO_N "checking if $CC supports -fno-strict-aliasing... $ECHO_C" >&6
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pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS -fno-strict-aliasing"
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cat >conftest.$ac_ext <<_ACEOF
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#line $LINENO "configure"
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#include "confdefs.h"
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#ifdef F77_DUMMY_MAIN
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# ifdef __cplusplus
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extern "C"
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# endif
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int F77_DUMMY_MAIN() { return 1; }
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#endif
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
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(eval $ac_compile) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } &&
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{ ac_try='test -s conftest.$ac_objext'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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else
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echo "$as_me: failed program was:" >&5
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cat conftest.$ac_ext >&5
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CFLAGS="$pgac_save_CFLAGS"
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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fi
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rm -f conftest.$ac_objext conftest.$ac_ext
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if test x"$pgac_cv_prog_cc_no_strict_aliasing" != x""; then
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CFLAGS="$CFLAGS $pgac_cv_prog_cc_no_strict_aliasing"
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fi
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# supply -g if --enable-debug
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16
configure.in
16
configure.in
@ -1,5 +1,5 @@
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dnl Process this file with autoconf to produce a configure script.
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dnl $PostgreSQL: pgsql/configure.in,v 1.381 2004/10/15 05:10:59 momjian Exp $
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dnl $PostgreSQL: pgsql/configure.in,v 1.382 2004/10/20 02:12:06 neilc Exp $
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dnl
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dnl Developers, please strive to achieve this order:
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dnl
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@ -250,8 +250,18 @@ else
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fi
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fi
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# Need to specify -fno-strict-aliasing too in case it's gcc 3.3 or later.
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PGAC_PROG_CC_NO_STRICT_ALIASING
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if test "$GCC" = yes; then
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CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith"
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# Some versions of GCC support some additional useful warning flags.
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# Check whether they are supported, and add them to CFLAGS if so.
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PGAC_PROG_CC_CFLAGS_OPT([-Wdeclaration-after-statement])
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PGAC_PROG_CC_CFLAGS_OPT([-Wold-style-definition])
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PGAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])
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# Disable strict-aliasing rules; needed for gcc 3.3+
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PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])
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fi
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# supply -g if --enable-debug
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if test "$enable_debug" = yes && test "$ac_cv_prog_cc_g" = yes; then
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@ -1,5 +1,5 @@
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# -*-makefile-*-
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# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.203 2004/10/15 17:10:58 momjian Exp $
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# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.204 2004/10/20 02:12:07 neilc Exp $
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#------------------------------------------------------------------------------
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# All PostgreSQL makefiles include this file and use the variables it sets,
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@ -184,9 +184,6 @@ endif # not PGXS
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CC = @CC@
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GCC = @GCC@
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CFLAGS = @CFLAGS@
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ifeq ($(GCC), yes)
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CFLAGS += -Wall -Wmissing-prototypes -Wmissing-declarations
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endif
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# Kind-of compilers
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