Optimized Makefile generation for a ~30% time win.
authorK. Richard Pixley <rich@cygnus>
Fri, 7 Feb 1992 02:04:53 +0000 (02:04 +0000)
committerK. Richard Pixley <rich@cygnus>
Fri, 7 Feb 1992 02:04:53 +0000 (02:04 +0000)
configure
configure.texi

index ff75fa2c1d4034da4be543dfe13a84447880ccb2..f9a3989dd35e4ca36eabb22bc8a3142c5934c997 100755 (executable)
--- a/configure
+++ b/configure
@@ -58,9 +58,10 @@ defaulttargets=
 fatal=
 floating_point=default
 gas=default
+host_makefile_frag=
 hosts=
-next_prefix=
 next_host=
+next_prefix=
 next_site=
 next_srcdir=
 next_target=
@@ -70,9 +71,11 @@ prefix=/usr/local
 progname=
 recurring=
 removing=
+site_makefile_frag=
 srcdir=
 srctrigger=
 target=
+target_makefile_frag=
 targets=
 undefinedargs=
 verbose=
@@ -333,6 +336,12 @@ case "${srcdir}" in
 esac
 
 
+# default datadir
+case "${datadir}" in
+"") datadir="$(prefix)/lib" ;;
+*) ;;
+esac
+
 ### break up ${srcdir}/configure.in.
 case "`grep '^# per\-host:' ${srcdir}/configure.in`" in
 "")
@@ -398,11 +407,6 @@ for host in ${hosts} ; do
        host_vendor=`echo $result | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\2/'`
        host_os=`echo $result | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\3/'`
        host=${host_cpu}-${host_vendor}-${host_os}
-       host_makefile_frag=config/mh-${host}
-       if [ ! -f ${host_makefile_frag} ]
-       then
-               host_makefile_frag=config/mh-${host_alias}
-       fi
 
        . ${tmpfile}.hst
 
@@ -414,11 +418,6 @@ for host in ${hosts} ; do
                target_vendor=`echo $result | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\2/'`
                target_os=`echo $result | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\3/'`
                target=${target_cpu}-${target_vendor}-${target_os}
-               target_makefile_frag=config/mt-${target}
-               if [ ! -f ${target_makefile_frag} ]
-               then
-                       target_makefile_frag=config/mt-${target_alias}
-               fi
 
                . ${tmpfile}.tgt
 
@@ -494,11 +493,12 @@ for host in ${hosts} ; do
                                case ${srcdir} in
                                .)
                                        ;;
-                               *)
-                                       echo "# "${NO_EDIT} > .gdbinit
-                                       echo "dir ." >> .gdbinit
-                                       echo "dir ${srcdir}" >> .gdbinit
-                                       echo "source ${srcdir}/.gdbinit" >> .gdbinit
+                               *) cat > .gdbinit <<EOF
+# ${NO_EDIT} > .gdbinit
+dir .
+dir ${srcdir}
+source ${srcdir}/.gdbinit
+EOF
                                        ;;
                                esac
                        fi
@@ -506,135 +506,114 @@ for host in ${hosts} ; do
                        # Install a makefile, and make it set VPATH
                        # if necessary so that the sources are found.
                        # Also change its value of srcdir.
+                       # NOTE: Makefile generation constitutes the majority of the time in configure.  Hence, this section has
+                       # been somewhat optimized and is perhaps a bit twisty.
 
-               # FIXME-someday: This business of always writing to .tem and mv back
-               # is so that I don't screw things up while developing.  Once this
-               # template is stable, these should be optimized. xoxorich.
-
-                       # Define macro CROSS_COMPILE in compilation if this is a cross-compiler.
-                       case "${host}" in
-                       "${target}") echo "ALL=all.internal" > ${Makefile} ;;
-                       *)
-                               echo "CROSS=-DCROSS_COMPILE" > ${Makefile}
-                               echo "ALL=all.cross" >> ${Makefile}
-                               ;;
-                       esac
-
-                       # set target, host, VPATH
-                       echo "host_alias = ${host_alias}" >> ${Makefile}
-                       echo "host_cpu = ${host_cpu}" >> ${Makefile}
-                       echo "host_vendor = ${host_vendor}" >> ${Makefile}
-                       echo "host_os = ${host_os}" >> ${Makefile}
-
-                       echo "target_alias = ${target_alias}" >> ${Makefile}
-                       echo "target_cpu = ${target_cpu}" >> ${Makefile}
-                       echo "target_vendor = ${target_vendor}" >> ${Makefile}
-                       echo "target_os = ${target_os}" >> ${Makefile}
-
-                               echo "subdir =" >> ${Makefile}
-                               echo "unsubdir = ." >> ${Makefile}
-
-                       echo "VPATH = ${srcdir}" >> ${Makefile}
+                       # code is order so as to try to sed the smallest input files we know.
 
-                       # add "Makefile.in" (or whatever it's called)
-                       cat ${srcdir}/${Makefile_in} >> ${Makefile}
+                       # the three makefile fragments MUST end up in the resulting Makefile in this order: target, host, and site.
+                       # so do these separately because I don't trust the order of sed -e expressions.
 
-                       # Conditionalize the makefile for this site.
+                       # Conditionalize for this site from "Makefile.in" (or whatever it's called) into Makefile.tem
                        case "${site}" in
-                       "") ;;
+                       "") cp ${srcdir}/${Makefile_in} Makefile.tem ;;
                        *)
-                               site_makefile_frag=config/ms-${site}
+                               site_makefile_frag=${srcdir}/config/ms-${site}
 
-                               if [ -f ${srcdir}/${site_makefile_frag} ] ; then
-                                       echo "site_makefile_frag = ${srcdir}/${site_makefile_frag}" > Makefile.tem
-                                       sed -e "/^####/  r ${srcdir}/${site_makefile_frag}" ${Makefile} >> Makefile.tem
+                               if [ -f ${site_makefile_frag} ] ; then
+                                       sed -e "/^####/  r ${site_makefile_frag}" ${srcdir}/${Makefile_in} \
+                                               >> Makefile.tem
                                else
-                                       echo "site_makefile_frag =" > Makefile.tem
-                                       cat ${Makefile} >> Makefile.tem
+                                       cp ${srcdir}/${Makefile_in} Makefile.tem
+                                       site_makefile_frag=
                                fi
-                               mv Makefile.tem ${Makefile}
                                ;;
                        esac
+                       # working copy now in Makefile.tem
 
                        # Conditionalize the makefile for this host.
-                       if [ -f ${srcdir}/${host_makefile_frag} ] ; then
-                               echo "host_makefile_frag = ${srcdir}/${host_makefile_frag}" > Makefile.tem
-                               sed -e "/^####/  r ${srcdir}/${host_makefile_frag}" ${Makefile} >> Makefile.tem
-                       else
-                               echo "host_makefile_frag =" > Makefile.tem
-                               cat ${Makefile} >> Makefile.tem
-                       fi
-                       mv Makefile.tem ${Makefile}
+                       case "${host_makefile_frag}" in
+                       "") mv Makefile.tem ${Makefile} ;;
+                       *)
+                               if [ -f ${host_makefile_frag} ] ; then
+                                       sed -e "/^####/  r ${host_makefile_frag}" Makefile.tem >> ${Makefile}
+                               else
+                                       echo '***' Expected host makefile fragment \"${host_makefile_frag}\" 1>&2
+                                       echo '***' is missing in ${PWD}. 1>&2
+                                       mv Makefile.tem ${Makefile}
+                               fi
+                       esac
+                       # working copy now in ${Makefile}
 
                        # Conditionalize the makefile for this target.
-                       if [ -f ${srcdir}/${target_makefile_frag} ] ; then
-                               echo "target_makefile_frag = ${srcdir}/${target_makefile_frag}" > Makefile.tem
-                               sed -e "/^####/  r ${srcdir}/${target_makefile_frag}" ${Makefile} >> Makefile.tem
+                       target_makefile_frag=${srcdir}/${target_makefile_frag}
+                       if [ -f ${target_makefile_frag} ] ; then
+                               sed -e "/^####/  r ${target_makefile_frag}" ${Makefile} >> Makefile.tem
                        else
-                               echo "target_makefile_frag =" > Makefile.tem
-                               cat ${Makefile} >> Makefile.tem
+                               mv ${Makefile} Makefile.tem
+                               target_makefile_frag=
                        fi
-                       mv Makefile.tem ${Makefile}
+                       # real copy now in Makefile.tem
 
-                       # set srcdir
-                       sed "s:^srcdir[         ]*=.*$:srcdir = ${srcdir}:" ${Makefile} > Makefile.tem
-                       mv Makefile.tem ${Makefile}
-
-                       # set prefix
-                       case "${prefix}" in
-                       "") ;;
-                       *)
-                               sed "s:^prefix[         ]*=.*$:prefix = ${prefix}:" ${Makefile} > Makefile.tem
-                               mv Makefile.tem ${Makefile}
-                               ;;
-                       esac
-
-                       # set datadir
-                       case "${datadir}" in
-                       "") ;;
+                       # prepend warning about editting, and a bunch of variables.
+                       # fixme-someday: remove the subdir/unsubdir lines.
+                       cat > ${Makefile} <<EOF
+# ${NO_EDIT}
+host_alias = ${host_alias}
+host_cpu = ${host_cpu}
+host_vendor = ${host_vendor}
+host_os = ${host_os}
+target_alias = ${target_alias}
+target_cpu = ${target_cpu}
+target_vendor = ${target_vendor}
+target_os = ${target_os}
+target_makefile_frag = ${target_makefile_frag}
+host_makefile_frag = ${host_makefile_frag}
+site_makefile_frag = ${site_makefile_frag}
+VPATH = ${srcdir}
+subdir =
+unsubdir = .
+EOF
+
+                       # fixme: this shouldn't be in configure.
+                       # Define macro CROSS_COMPILE in compilation if this is a cross-compiler.
+                       case "${host}" in
+                       "${target}") echo "ALL=all.internal" >> ${Makefile} ;;
                        *)
-                               sed "s:^datadir[        ]*=.*$:datadir = ${datadir}:" ${Makefile} > Makefile.tem
-                               mv Makefile.tem ${Makefile}
+                               echo "CROSS=-DCROSS_COMPILE" >> ${Makefile}
+                               echo "ALL=all.cross" >> ${Makefile}
                                ;;
                        esac
 
-                       # reset SUBDIRS
-                       sed "s:^SUBDIRS[        ]*=.*$:SUBDIRS = ${configdirs}:" ${Makefile} > Makefile.tem
-                       mv Makefile.tem ${Makefile}
+                       # reset prefix, datadir, srcdir, SUBDIRS, NONSUBDIRS, remove any form
+                       # feeds.
+                       sed -e "s:^prefix[      ]*=.*$:prefix = ${prefix}:" \
+                               -e "s:^datadir[         ]*=.*$:datadir = ${datadir}:" \
+                               -e "s:^srcdir[  ]*=.*$:srcdir = ${srcdir}:" \
+                               -e "s:^SUBDIRS[         ]*=.*$:SUBDIRS = ${configdirs}:" \
+                               -e "s:^NONSUBDIRS[      ]*=.*$:NONSUBDIRS = ${noconfigdirs}:" \
+                               -e "s/\f//" Makefile.tem >> ${Makefile}
+                       # final copy now in ${Makefile}
 
-                       # reset NONSUBDIRS
-                       sed "s:^NONSUBDIRS[     ]*=.*$:NONSUBDIRS = ${noconfigdirs}:" ${Makefile} > Makefile.tem
-                       mv Makefile.tem ${Makefile}
+                       rm Makefile.tem
 
-                       # remove any form feeds.
-                       sed -e "s/\f//" ${Makefile} > Makefile.tem
-                       mv Makefile.tem ${Makefile}
+                       if [ -n "${verbose}" -o -z "${recurring}" ] ; then
+                               case "${host_makefile_frag}" in
+                               "") using= ;;
+                               *) using="and \"${host_makefile_frag}\"" ;;
+                               esac
 
-                       # prepend warning about editting.
-                       echo "# "${NO_EDIT} > ${Makefile}.tem
-                       cat ${Makefile} >> ${Makefile}.tem
-                       mv Makefile.tem ${Makefile}
+                               case "${target_makefile_frag}" in
+                               "") ;;
+                               *) using="${using} and \"${target_makefile_frag}\"" ;;
+                               esac
 
-                       using=
-                       if [ -f ${srcdir}/${host_makefile_frag} ] ; then
-                               using="${using} and \"${host_makefile_frag}\""
-                       fi
-                       if [ -f ${srcdir}/${target_makefile_frag} ] ; then
-                               using="${using} and \"${target_makefile_frag}\""
-                       fi
-                       case "${site}" in
-                       "") ;;
-                       *)
-                               if [ -f ${srcdir}/${site_makefile_frag} ] ; then
-                                       using="${using} and \"${site_makefile_frag}\""
-                               fi
-                               ;;
-                       esac
-                       using=`echo "${using}" | sed 's/and/using/'`
-                       using="Created \"${Makefile}\" in ${PWD}${using}."
+                               case "${site_makefile_frag}" in
+                               "") ;;
+                               *) using="${using} and \"${site_makefile_frag}\"" ;;
+                               esac
 
-                       if [ -n "${verbose}" -o -z "${recurring}" ] ; then
-                               echo ${using}
+                               echo "Created \"${Makefile}\" in" ${PWD} `echo "${using}" | sed 's/and/using/'`
                        fi
 
                        . ${tmpfile}.pos
index 7e2cf4e2681602c49f97b2432f487d4a9184f09a..25aad8b1a3546804d4ac45b5324cb720e8b05e60 100644 (file)
@@ -200,9 +200,9 @@ specify other aspects of the source configuration:
 @item -datadir=@var{dir}
 Configure the source to install host independent files in @var{dir}.
 
-This option sets the @code{configure} variable @code{datadir}.  If
-@code{datadir} is not empty, generated Makefiles will have their
-@code{datadir} variables set to this value. (See @ref{Install Details}.)
+This option sets the @code{configure} variable @code{datadir}.
+Generated Makefiles will have their @code{datadir} variables set to this
+value. (See @ref{Install Details}.)
 
 @item -gas
 Configure to use the @sc{GNU} assembler.
@@ -246,9 +246,9 @@ This option is no longer supported.  Use @code{-srcdir=} instead.
 Configure the source to install programs and files under directory
 @file{@var{dir}}.
 
-This option sets the @code{configure} variable @code{prefix}.  If
-@code{prefix} is not empty, generated Makefiles will have their
-@code{prefix} variables set to this value. (See @ref{Install Details}.)
+This option sets the @code{configure} variable @code{prefix}.  Generated
+Makefiles will have their @code{prefix} variables set to this value.
+(See @ref{Install Details}.)
 
 @item -recurring
 @c Wouldn't it make more sense to call this "-quiet"? (FIXME).
@@ -1207,15 +1207,17 @@ either the @code{-srcdir=} or the @code{-subdirs} options.  Note that
 @end defvar
 
 @defvar{host_makefile_frag}
-Is set to a file name representing to the default Makefile fragment for
-this host.  It may be set in @file{configure.in} to override this
-default.
+If set by @file{configure.in}, this variable should name a file to be
+included in the resulting Makefile.  If the named file does not exist,
+@code{configure} will print a warning message.  This variable is not set
+by @code{configure}.
 @end defvar
 
 @defvar{target_makefile_frag}
-Is set to a file name representing to the default Makefile fragment for
-this target.  It may be set in @file{configure.in} to override this
-default.
+If set by @file{configure.in}, this variable should name a file to be
+included in the resulting Makefile.  If the named file does not exist,
+@code{configure} will print a warning message.  This variable is not set
+by @code{configure}.
 @end defvar
 
 @defvar{site_makefile_frag}