?RCS: $Id: ccflags.U,v 3.0.1.9 1997/02/28 15:27:07 ram Exp $
?RCS:
?RCS: Copyright (c) 1991-1993, Raphael Manfredi
-?RCS:
-?RCS: You may redistribute only under the terms of the Artistic Licence,
+?RCS:
+?RCS: You may redistribute only under the terms of the Artistic License,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
-?RCS: that same Artistic Licence; a copy of which may be found at the root
+?RCS: that same Artistic License; a copy of which may be found at the root
?RCS: of the source tree for dist 3.0.
?RCS:
?RCS: $Log: ccflags.U,v $
?RCS: patch54: now checks for cc/ccflags/ldflags coherency
?RCS:
?RCS: Revision 3.0.1.6 1994/10/29 16:07:02 ram
-?RCS: patch36: gcc versionning no longer relies on the C compiler's name
+?RCS: patch36: gcc versioning no longer relies on the C compiler's name
?RCS: patch36: simplified check for gcc version checking (ADO)
?RCS:
?RCS: Revision 3.0.1.5 1994/08/29 16:06:35 ram
?RCS: patch23: magically added cc flags now only done the first time
?RCS:
?RCS: Revision 3.0.1.3 1993/09/13 15:58:29 ram
-?RCS: patch10: explicitely mention -DDEBUG just in case they need it (WAD)
+?RCS: patch10: explicitly mention -DDEBUG just in case they need it (WAD)
?RCS: patch10: removed all the "tans" variable usage (WAD)
?RCS:
?RCS: Revision 3.0.1.2 1993/08/27 14:39:38 ram
?RCS: Revision 3.0 1993/08/18 12:05:31 ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
-?MAKE:ccflags ldflags lkflags cppflags optimize locincpth: test cat \
+?MAKE:ccflags ldflags lkflags cppflags optimize locincpth: test cat osname \
Myread Guess Options Oldconfig +gccversion mips_type +usrinc \
package contains rm +cc cppstdin cppminus cpprun cpplast libpth \
- libs loclibpth hint usesocks sh
+ libs loclibpth hint usesocks sh run rm_try sysroot
?MAKE: -pick add $@ %<
?S:ccflags:
?S: This variable contains any additional C compiler flags desired by
?S: local directories from the Configure command line.
?S: It's not much, but it parallels the loclibpth stuff in libpth.U.
?S:.
-?T:inctest thisincl xxx flag inclwanted ftry previous thislibdir
+?T:inctest thisincl xxx inclwanted ftry previous thislibdir
+?T:EBUGGING DEBUGGING
+?T:check flag callback checkccflag
+?F:!cpp.c !gcctest !try
?D:cppflags=''
?D:ccflags=''
?D:ldflags=''
?D:optimize=''
-?F:!try
+?LINT:extern _sysroot
?INIT:: Possible local include directories to search.
?INIT:: Set locincpth to "" in a hint file to defeat local include searches.
?INIT:locincpth="/usr/local/include /opt/local/include /usr/gnu/include"
?INIT:: no include file wanted by default
?INIT:inclwanted=''
?INIT:
+?INIT:: Enable -DEBUGGING and -DDEBUGGING from the command line
+?INIT:EBUGGING=''
+?INIT:DEBUGGING=''
+?INIT:
: determine optimization, if desired, or use for debug flag also
?X: Allow for Configure -Uoptimize -- it's not strictly sensible, but
?X: it has happened and we know what they mean. AD 2/16/98
'none') optimize=" ";;
esac
+: Check what DEBUGGING is required from the command line
+: -DEBUGGING or -DDEBUGGING or
+: -DEBUGGING=both = -g + -DDEBUGGING
+: -DEBUGGING=-g or -Doptimize=-g = -g
+: -DEBUGGING=none or -UDEBUGGING =
+: -DEBUGGING=old or -DEBUGGING=default = ? $optimize
+case "$EBUGGING" in
+'') ;;
+*) DEBUGGING=$EBUGGING ;;
+esac
+
+case "$DEBUGGING" in
+-g|both|$define)
+ case "$optimize" in
+ *-g*) ;;
+ *) optimize="$optimize -g" ;;
+ esac ;;
+none|$undef)
+ case "$optimize" in
+ *-g*) set `echo "X $optimize " | sed 's/ -g / /'`
+ shift
+ optimize="$*"
+ ;;
+ esac ;;
+esac
+
dflt=''
+case "$DEBUGGING" in
+both|$define) dflt='-DDEBUGGING'
+esac
+
+: argument order is deliberate, as the flag will start with - which set could
+: think is an option
+checkccflag='check=$1; flag=$2; callback=$3;
+echo " ";
+echo "Checking if your compiler accepts $flag" 2>&1;
+[ "X$sysroot" != "X" ] && echo "For sysroot = $sysroot";
+echo "int main(void) { return 0; }" > gcctest.c;
+if $cc $_sysroot -O2 $flag -o gcctest gcctest.c 2>gcctest.out && $run ./gcctest; then
+ echo "Yes, it does." 2>&1;
+ if $test -s gcctest.out ; then
+ echo "But your platform does not like it:";
+ cat gcctest.out;
+ else
+ case "$ccflags" in
+ *$check*)
+ echo "Leaving current flags $ccflags alone." 2>&1
+ ;;
+ *) dflt="$dflt $flag";
+ eval $callback
+ ;;
+ esac
+ fi
+else
+ echo "Nope, it does not, but that is ok." 2>&1;
+fi
+'
+
: We will not override a previous value, but we might want to
: augment a hint file
case "$hint" in
default|recommended)
case "$gccversion" in
- 1*) dflt='-fpcc-struct-return' ;;
+ 1*) dflt="$dflt -fpcc-struct-return" ;;
esac
- case "$optimize" in
- *-g*) dflt="$dflt -DDEBUGGING";;
+ case "$optimize:$DEBUGGING" in
+ *-g*:old) dflt="$dflt -DDEBUGGING";;
esac
?X: check for POSIXized ISC
case "$gccversion" in
- 2*) if test -d /etc/conf/kconfig.d &&
+ 2*) if $test -d /etc/conf/kconfig.d &&
$contains _POSIX_VERSION $usrinc/sys/unistd.h >/dev/null 2>&1
then
+ # Interactive Systems (ISC) POSIX mode.
dflt="$dflt -posix"
fi
;;
case "$gccversion" in
1*) ;;
2.[0-8]*) ;;
- ?*) echo " "
- echo "Checking if your compiler accepts -fno-strict-aliasing" 2>&1
- echo 'int main(void) { return 0; }' > gcctest.c
- if $cc -O2 -fno-strict-aliasing -o gcctest gcctest.c; then
- echo "Yes, it does." 2>&1
- case "$ccflags" in
- *strict-aliasing*)
- echo "Leaving current flags $ccflags alone." 2>&1
- ;;
- *) dflt="$dflt -fno-strict-aliasing" ;;
+ ?*) set strict-aliasing -fno-strict-aliasing
+ eval $checkccflag
+ ;;
+ esac
+?X: HMB 200405
+?X: -pipe has shown a compile time speedup of about 40% on Linux and HP-UX
+?X: and also worked on cygwin-1.5.9
+?X: If a system fails, disable it in the hints. 99% of gcc uses binutils
+ # For gcc, adding -pipe speeds up compilations for some, but apparently
+ # some assemblers can't read from stdin. (It also slows down compilations
+ # in other cases, but those are apparently rarer these days.) AD 5/2004.
+ case "$gccversion" in
+ ?*) set pipe -pipe
+ eval $checkccflag
+ ;;
+ esac
+
+?X: NWC 200712
+ # on x86_64 (at least) we require an extra library (libssp) in the
+ # link command line. This library is not named, so I infer that it is
+ # an implementation detail that may change. Hence the safest approach
+ # is to add the flag to the flags passed to the compiler at link time,
+ # as that way the compiler can do the right implementation dependant
+ # thing. (NWC)
+ case "$osname" in
+ amigaos) ;; # -fstack-protector builds but doesn't work
+ *) case "$gccversion" in
+ ?*) set stack-protector-strong -fstack-protector-strong
+ eval $checkccflag
+ case "$dflt" in
+ *-fstack-protector-strong*) ;; # It got added.
+ *) # Try the plain/older -fstack-protector.
+ set stack-protector -fstack-protector
+ eval $checkccflag
+ ;;
esac
- else
- echo "Nope, it doesn't, but that's ok." 2>&1
- fi
+ ;;
+ esac
;;
esac
;;
if $test -d $thisincl; then
if $test x$thisincl != x$usrinc; then
case "$dflt" in
- *" -I$thisincl "*);;
- *) dflt="$dflt -I$thisincl ";;
+ *" -I$thisincl "*);;
+ *) dflt="$dflt -I$thisincl ";;
esac
fi
fi
esac
: the following weeds options from ccflags that are of no interest to cpp
-cppflags="$ccflags"
+case "$cppflags" in
+'') cppflags="$ccflags" ;;
+*) cppflags="$cppflags $ccflags" ;;
+esac
case "$gccversion" in
1*) cppflags="$cppflags -D__GNUC__"
esac
;;
*) dflt="$ldflags";;
esac
+# See note above about -fstack-protector
+case "$ccflags" in
+*-fstack-protector-strong*)
+ case "$dflt" in
+ *-fstack-protector-strong*) ;; # Don't add it again
+ *) dflt="$dflt -fstack-protector-strong" ;;
+ esac
+ ;;
+*-fstack-protector*)
+ case "$dflt" in
+ *-fstack-protector*) ;; # Don't add it again
+ *) dflt="$dflt -fstack-protector" ;;
+ esac
+ ;;
+esac
: Try to guess additional flags to pick up local libraries.
for thislibdir in $libpth; do
case " $loclibpth " in
*" $thislibdir "*)
- case "$dflt " in
+ case "$dflt " in
*"-L$thislibdir "*) ;;
*) dflt="$dflt -L$thislibdir" ;;
esac
?X: possible that the suggested ccflags/ldflags will be wrong. Try to
?X: compile and run a simple test program. Let the user see all the
?X: error messages. -- ADO and RAM
-?X: Sometimes, particularly on Linux systems, there is a bad library
+?X: Sometimes, particularly on Linux systems, there is a bad library
?X: (e.g. a dangling symlink or incompatible library or a "run-time"
?X: version but not a "development" version of a library). This test
?X: will catch those sorts of problems too, though how to fix them
echo "Checking your choice of C compiler and flags for coherency..." >&4
$cat > try.c <<'EOF'
#include <stdio.h>
-int main() { printf("Ok\n"); exit(0); }
+int main() { printf("Ok\n"); return(0); }
EOF
?X: Strip extra blanks in case some of the following variables are empty
set X $cc -o try $optimize $ccflags $ldflags try.c $libs
I used the command:
$*
- ./try
+ $run ./try
and I got the following output:
?X: We need to try the resulting executable, because cc might yield a 0 status
?X: even when ld failed, in which case the executable will not run properly,
?X: if its x bit is set at all...
-?X:
-?X: Also check the xxx=`./try` output to check for misconfigured -lsfio.
-?X: If sfio's iffe goofed and it uses _exit instead of exit, then the
-?X: output buffers don't get flushed and we don't see any output
-?X: when run from within `backticks`. What fun.
-?X: --Andy Dougherty 2/13/1998
if $sh -c "$cc -o try $optimize $ccflags $ldflags try.c $libs" >>try.msg 2>&1; then
- if $sh -c './try' >>try.msg 2>&1; then
- xxx=`./try`
+ if $sh -c "$run ./try " >>try.msg 2>&1; then
+ xxx=`$run ./try`
case "$xxx" in
"Ok") dflt=n ;;
- *) echo 'The program compiled OK, but produced no output.' >> try.msg
- case " $libs " in
- *" -lsfio "*)
- cat >> try.msg <<'EOQS'
-If $libs contains -lsfio, and sfio is mis-configured, then it
-sometimes (apparently) runs and exits with a 0 status, but with no
-output! It may have to do with sfio's use of _exit vs. exit.
-
-EOQS
- rp="You have a big problem. Shall I abort Configure"
- dflt=y
- ;;
- esac
- ;;
+ *) echo 'The program compiled OK, but produced no output.' >> try.msg ;;
esac
else
echo "The program compiled OK, but exited with status $?." >>try.msg
;;
n) echo "OK, that should do.";;
esac
-$rm -f try try.* core
+$rm_try gcctest gcctest.out
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