#! /bin/sh
#
-# Update a local CVS tree from the GCC repository, with an emphasis
-# on treating generated files correctly, so that autoconf, gperf et
-# al are not required for the ``end'' user.
+# Update a local Subversion, Git or Mercurial tree from the GCC
+# repository, with an emphasis on treating generated files correctly, so
+# that autoconf, gperf et al are not required for the ``end'' user.
#
-# By default all command-line options are passed to `cvs update` in
-# addition to $UPDATE_OPTIONS (defined below). If the first parameter
+# (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009,
+# 2010, 2011, 2012, 2013, 2014, 2015, 2017 Free Software Foundation
+# Originally by Gerald Pfeifer <gerald@pfeifer.com>, August 1998.
+#
+# This script is Free Software, and it can be copied, distributed and
+# modified as defined in the GNU General Public License. A copy of
+# its license can be downloaded from http://www.gnu.org/copyleft/gpl.html
+#
+#
+# By default all command-line options are passed to `svn update` or `hg/git
+# pull` in addition to $UPDATE_OPTIONS (defined below). If the first parameter
# reads --nostdflags, $UPDATE_OPTIONS as well as this parameter itself
# are omitted.
#
# If the first parameter reads --patch, the second parameter is considered
# a patch file.
#
-# If the first parameter is --touch, no cvs operation will be performed,
+# If the first parameter is --touch, no svn operation will be performed,
# only generated files that appear to be out of date in the local tree
# will be touched.
#
# If the first parameter is --list, a list of the generated files and
# their dependencies will be printed; --help prints this message.
#
+# If the first parameter is --silent, this script prints nothing other
+# than error messages; the second parameter is then interpreted as above.
+#
# Examples:
#
-# contrib/gcc_update -r gcc_latest_snapshot
-# contrib/gcc_update -A
-# contrib/gcc_update --nostdflags -P -r gcc-2_95-branch gcc/testsuite
+# contrib/gcc_update -r 8712
# contrib/gcc_update --patch some-patch
# contrib/gcc_update --touch
# contrib/gcc_update --list
-#
-#
-# (C) 1998, 1999, 2000, 2001 Free Software Foundation
-# Originally by Gerald Pfeifer <pfeifer@dbai.tuwien.ac.at>, August 1998.
-#
-# This script is Free Software, and it can be copied, distributed and
-# modified as defined in the GNU General Public License. A copy of
-# its license can be downloaded from http://www.gnu.org/copyleft/gpl.html
-# Default options used when updating via CVS.
-UPDATE_OPTIONS=-Pd
-# Use -P to prune empty directories.
-# Use -d to create any directories that exist in the repository but not
-# locally.
-# Use -A to reset any sticky tags, dates, or `-k' options.
+# Default options used when updating (none).
+UPDATE_OPTIONS=""
+
+# Set the locale to C to make this script work for users with foreign
+# locale like e.g. French UTF-8.
+LANG=C
+LC_ALL=C
+export LANG LC_ALL
######## Anything below shouldn't be changed by regular users.
# Arrange for the value of $0 to be available for functions
self=$0
+# This function prints its arguments to standard output unless
+# "silent" is set.
+unset silent
+chat () {
+ if [ -z "$silent" ]; then
+ echo "$@"
+ fi
+}
+
# This function prints a list of all generated files, along with their
# dependencies. Note that only one target is supported per line: the
# colon is stripped from the output.
files_and_dependencies () {
sed -e 's/ *#.*//' -e '/^$/d' -e 's/://' <<\EOF
-# All automake dependencies within texinfo
-# In fact, not all, since we do not care about sub-directories that
-# we do not build. In particular, *.po and *.gmo are not touched.
-texinfo/aclocal.m4: texinfo/configure.in texinfo/acinclude.m4
-texinfo/Makefile.in: texinfo/Makefile.am texinfo/configure.in texinfo/aclocal.m4
-texinfo/configure: texinfo/configure.in texinfo/aclocal.m4
-texinfo/stamp-h.in: texinfo/configure.in texinfo/aclocal.m4 texinfo/acconfig.h
-texinfo/lib/Makefile.in: texinfo/lib/Makefile.am texinfo/configure.in texinfo/aclocal.m4
-texinfo/makeinfo/Makefile.in: texinfo/makeinfo/Makefile.am texinfo/configure.in texinfo/aclocal.m4
-texinfo/util/Makefile.in: texinfo/util/Makefile.am texinfo/configure.in texinfo/aclocal.m4
+# fixincludes
+fixincludes/configure: fixincludes/configure.ac fixincludes/aclocal.m4
+fixincludes/config.h.in: fixincludes/configure.ac fixincludes/aclocal.m4
+# intl library
+intl/plural.c: intl/plural.y
+intl/configure: intl/configure.ac intl/aclocal.m4
+intl/config.h.in: intl/configure.ac intl/aclocal.m4
# Now, proceed to gcc automatically generated files
-gcc/configure: gcc/configure.in
-gcc/cstamp-h.in: gcc/configure.in gcc/acconfig.h
+gcc/configure: gcc/configure.ac
+gcc/cstamp-h.in: gcc/configure.ac
gcc/config.in: gcc/cstamp-h.in
gcc/fixinc/fixincl.x: gcc/fixinc/fixincl.tpl gcc/fixinc/inclhack.def
+gcc/config/aarch64/aarch64-tune.md: gcc/config/aarch64/aarch64-cores.def gcc/config/aarch64/gentune.sh
+gcc/config/arm/arm-tune.md: gcc/config/arm/arm-cpus.in gcc/config/arm/parsecpu.awk
+gcc/config/arm/arm-tables.opt: gcc/config/arm/arm-cpus.in gcc/config/arm/parsecpu.awk
+gcc/config/avr/t-multilib: gcc/config/avr/avr-mcus.def gcc/config/avr/genmultilib.awk
+gcc/config/c6x/c6x-tables.opt: gcc/config/c6x/c6x-isas.def gcc/config/c6x/genopt.sh
+gcc/config/c6x/c6x-sched.md: gcc/config/c6x/c6x-sched.md.in gcc/config/c6x/gensched.sh
+gcc/config/c6x/c6x-mult.md: gcc/config/c6x/c6x-mult.md.in gcc/config/c6x/genmult.sh
+gcc/config/m68k/m68k-tables.opt: gcc/config/m68k/m68k-devices.def gcc/config/m68k/m68k-isas.def gcc/config/m68k/m68k-microarchs.def gcc/config/m68k/genopt.sh
+gcc/config/mips/mips-tables.opt: gcc/config/mips/mips-cpus.def gcc/config/mips/genopt.sh
+gcc/config/rs6000/rs6000-tables.opt: gcc/config/rs6000/rs6000-cpus.def gcc/config/rs6000/genopt.sh
+gcc/config/tilegx/mul-tables.c: gcc/config/tilepro/gen-mul-tables.cc
+gcc/config/tilepro/mul-tables.c: gcc/config/tilepro/gen-mul-tables.cc
# And then, language-specific files
-gcc/f/intdoc.texi: gcc/f/intdoc.in gcc/f/intdoc.c gcc/f/intrin.h gcc/f/intrin.def
-gcc/ada/treeprs.ads: gcc/ada/treeprs.adt gcc/ada/sinfo.ads gcc/ada/xtreeprs.adb
-gcc/ada/einfo.h: gcc/ada/einfo.ads gcc/ada/einfo.adb gcc/ada/xeinfo.adb
-gcc/ada/sinfo.h: gcc/ada/sinfo.ads gcc/ada/xsinfo.adb
-gcc/ada/nmake.adb: gcc/ada/sinfo.ads gcc/ada/nmake.adt gcc/ada/xnmake.adb
-gcc/ada/nmake.ads: gcc/ada/sinfo.ads gcc/ada/nmake.adt gcc/ada/xnmake.adb
-gcc/ada/gnat_ug_unx.texi: gcc/ada/gnat_ug.texi gcc/ada/xgnatug.adb gcc/ada/ug_words
-gcc/ada/gnat_ug_vms.texi: gcc/ada/gnat_ug.texi gcc/ada/xgnatug.adb gcc/ada/ug_words
-gcc/ada/gnat_ug_vxw.texi: gcc/ada/gnat_ug.texi gcc/ada/xgnatug.adb gcc/ada/ug_words
-gcc/ada/gnat_ug_w32.texi: gcc/ada/gnat_ug.texi gcc/ada/xgnatug.adb gcc/ada/ug_words
+gcc/cp/cfns.h: gcc/cp/cfns.gperf
+# testsuite
+# Without this, _Pragma3.c can have a false negative.
+gcc/testsuite/gcc.dg/cpp/_Pragma3.c: gcc/testsuite/gcc.dg/cpp/mi1c.h
+# Similarly, without this, you will see:
+# direct2s.c:35: warning: current file is older than direct2.c
+gcc/testsuite/gcc.dg/cpp/direct2s.c: gcc/testsuite/gcc.dg/cpp/direct2.c
+# lto-plugin
+lto-plugin/configure: lto-plugin/configure.ac lto-plugin/aclocal.m4
+lto-plugin/Makefile.in: lto-plugin/Makefile.am lto-plugin/aclocal.m4
# And libraries, at last
-libf2c/configure: libf2c/configure.in
-libf2c/libF77/configure: libf2c/libF77/configure.in
-libf2c/libI77/configure: libf2c/libI77/configure.in
-libf2c/libI77/stamp-h.in: libf2c/libI77/configure.in
-libf2c/libI77/config.h.in: libf2c/libI77/configure.in libf2c/libI77/stamp-h.in
-libf2c/libU77/configure: libf2c/libU77/configure.in
-libf2c/libU77/stamp-h.in: libf2c/libU77/configure.in libf2c/libU77/acconfig.h
-libobjc/configure: libobjc/configure.in
-# fastjar
-fastjar/aclocal.m4: fastjar/configure.in
-fastjar/Makefile.in: fastjar/Makefile.am fastjar/configure.in fastjar/aclocal.m4
-fastjar/configure: fastjar/configure.in fastjar/aclocal.m4
-fastjar/stamp-h.in: fastjar/configure.in fastjar/aclocal.m4
-boehm-gc/aclocal.m4: boehm-gc/configure.in boehm-gc/acinclude.m4
-boehm-gc/Makefile.in: boehm-gc/Makefile.am boehm-gc/configure.in boehm-gc/aclocal.m4
-boehm-gc/configure: boehm-gc/configure.in boehm-gc/aclocal.m4
-libjava/aclocal.m4: libjava/configure.in libjava/acinclude.m4
-libjava/Makefile.in: libjava/Makefile.am libjava/configure.in libjava/aclocal.m4
-libjava/configure: libjava/configure.in libjava/aclocal.m4
-libjava/libltdl/aclocal.m4: libjava/libltdl/configure.in libjava/libltdl/acinclude.m4
-libjava/libltdl/Makefile.in: libjava/libltdl/Makefile.am libjava/libltdl/configure.in libjava/libltdl/aclocal.m4
-libjava/libltdl/configure: libjava/libltdl/configure.in libjava/libltdl/aclocal.m4
-libjava/libltdl/stamp-h.in: libjava/libltdl/configure.in libjava/libltdl/aclocal.m4 libjava/libltdl/acconfig.h
+libbanshee/configure: libbanshee/configure.ac
+libmudflap/configure: libmudflap/configure.ac
+libobjc/configure: libobjc/configure.ac
+zlib/aclocal.m4: zlib/configure.ac zlib/acinclude.m4
+zlib/Makefile.in: zlib/Makefile.am zlib/configure.ac zlib/aclocal.m4
+zlib/configure: zlib/configure.ac zlib/aclocal.m4
+fastjar/aclocal.m4: fastjar/configure.ac
+fastjar/Makefile.in: fastjar/Makefile.am fastjar/configure.ac fastjar/aclocal.m4
+fastjar/configure: fastjar/configure.ac fastjar/aclocal.m4
+boehm-gc/aclocal.m4: boehm-gc/configure.ac
+boehm-gc/Makefile.in: boehm-gc/Makefile.am boehm-gc/configure.ac boehm-gc/aclocal.m4
+boehm-gc/configure: boehm-gc/configure.ac boehm-gc/aclocal.m4
+libada/configure: libada/configure.ac
+libffi/aclocal.m4: libffi/configure.ac libffi/acinclude.m4
+libffi/Makefile.in: libffi/Makefile.am libffi/configure.ac libffi/aclocal.m4
+libffi/configure: libffi/configure.ac libffi/aclocal.m4
+libffi/fficonfig.h.in: libffi/configure.ac libffi/aclocal.m4
+libgfortran/aclocal.m4: libgfortran/configure.ac libgfortran/acinclude.m4
+libgfortran/Makefile.in: libgfortran/Makefile.am libgfortran/configure.ac libgfortran/aclocal.m4
+libquadmath/configure: libquadmath/configure.ac libquadmath/aclocal.m4
+libquadmath/aclocal.m4: libquadmath/configure.ac libquadmath/acinclude.m4
+libquadmath/Makefile.in: libquadmath/Makefile.am libquadmath/configure.ac libgfortran/aclocal.m4
+libgfortran/configure: libgfortran/configure.ac libgfortran/aclocal.m4
+libcpp/aclocal.m4: libcpp/configure.ac
+libcpp/Makefile.in: libcpp/configure.ac libcpp/aclocal.m4
+libcpp/configure: libcpp/configure.ac libcpp/aclocal.m4
+libgomp/aclocal.m4: libgomp/configure.ac libgomp/acinclude.m4
+libgomp/Makefile.am: libgomp/plugin/Makefrag.am
+libgomp/Makefile.in: libgomp/Makefile.am libgomp/aclocal.m4
+libgomp/testsuite/Makefile.in: libgomp/testsuite/Makefile.am libgomp/aclocal.m4
+libgomp/configure.ac: libgomp/plugin/configfrag.ac
+libgomp/configure: libgomp/configure.ac libgomp/aclocal.m4
+libgomp/config.h.in: libgomp/configure.ac libgomp/aclocal.m4
+libhsail-rt/aclocal.m4: libhsail-rt/configure.ac
+libhsail-rt/Makefile.in: libhsail-rt/Makefile.am libhsail-rt/aclocal.m4
+libhsail-rt/configure: libhsail-rt/configure.ac libhsail-rt/aclocal.m4
+libhsail-rt/target-config.h.in: libhsail-rt/configure.ac libhsail-rt/aclocal.m4
+libitm/aclocal.m4: libitm/configure.ac libitm/acinclude.m4
+libitm/Makefile.in: libitm/Makefile.am libitm/aclocal.m4
+libitm/testsuite/Makefile.in: libitm/testsuite/Makefile.am libitm/aclocal.m4
+libitm/configure: libitm/configure.ac libitm/aclocal.m4
+libitm/config.h.in: libitm/configure.ac libitm/aclocal.m4
+libatomic/aclocal.m4: libatomic/configure.ac libatomic/acinclude.m4
+libatomic/Makefile.in: libatomic/Makefile.am libatomic/aclocal.m4
+libatomic/testsuite/Makefile.in: libatomic/testsuite/Makefile.am libatomic/aclocal.m4
+libatomic/configure: libatomic/configure.ac libatomic/aclocal.m4
+libatomic/auto-config.h.in: libatomic/configure.ac libatomic/aclocal.m4
+libsanitizer/aclocal.m4: libsanitizer/configure.ac libsanitizer/acinclude.m4
+libsanitizer/Makefile.in: libsanitizer/Makefile.am libsanitizer/aclocal.m4
+libsanitizer/configure: libsanitizer/configure.ac libsanitizer/aclocal.m4
+libsanitizer/asan/Makefile.in: libsanitizer/asan/Makefile.am libsanitizer/aclocal.m4
+libsanitizer/interception/Makefile.in: libsanitizer/interception/Makefile.am libsanitizer/aclocal.m4
+libsanitizer/sanitizer_common/Makefile.in: libsanitizer/sanitizer_common/Makefile.am libsanitizer/aclocal.m4
+libvtv/aclocal.m4: libvtv/configure.ac libvtv/acinclude.m4
+libvtv/Makefile.in: libvtv/Makefile.am libvtv/aclocal.m4
+libvtv/configure: libvtv/configure.ac libvtv/aclocal.m4
+liboffloadmic/aclocal.m4: liboffloadmic/configure.ac
+liboffloadmic/Makefile.in: liboffloadmic/Makefile.am
+liboffloadmic/configure: liboffloadmic/configure.ac
+liboffloadmic/plugin/aclocal.m4: liboffloadmic/plugin/configure.ac
+liboffloadmic/plugin/Makefile.in: liboffloadmic/plugin/Makefile.am
+liboffloadmic/plugin/configure: liboffloadmic/plugin/configure.ac
+libbacktrace/aclocal.m4: libbacktrace/configure.ac
+libbacktrace/Makefile.in: libbacktrace/Makefile.am libbacktrace/aclocal.m4
+libbacktrace/configure: libbacktrace/configure.ac libbacktrace/aclocal.m4
+libbacktrace/config.h.in: libbacktrace/configure.ac libbacktrace/aclocal.m4
+libphobos/Makefile.in: libphobos/Makefile.am libphobos/configure.ac libphobos/aclocal.m4
+libphobos/aclocal.m4: libphobos/configure.ac libphobos/acinclude.m4
+libphobos/config.h.in: libphobos/configure.ac libphobos/aclocal.m4
+libphobos/configure: libphobos/configure.ac libphobos/aclocal.m4
+libphobos/src/Makefile.in: libphobos/src/Makefile.am libphobos/aclocal.m4
+libphobos/testsuite/Makefile.in: libphobos/testsuite/Makefile.am libphobos/aclocal.m4
# Top level
Makefile.in: Makefile.tpl Makefile.def
-configure: configure.in config/acx.m4
+configure: configure.ac config/acx.m4
EOF
}
echo ':' >> Makefile.$$
echo ' @for f in $? $@; do test -f $$f || exit 0; done; \' >> Makefile.$$
echo ' echo Touching $@...; \' >> Makefile.$$
- echo ' echo Touching $@... 1>&2; \' >> Makefile.$$
+ chat ' echo Touching $@... 1>&2; \' >> Makefile.$$
echo ' touch $@' >> Makefile.$$
files_and_dependencies | sed 's,[^ ]* ,,;s,$, :,' >> Makefile.$$
- while ${MAKE-make} -s -f Makefile.$$ all | grep . > /dev/null; do
+
+ # We would have to explicitly shut off the "Entering... Leaving..."
+ # messages through "--no-print-directory" to handle the case when
+ # we were called from a recursive invocation (i.e. "$(MAKE)" in a
+ # Makefile, not just make). Passing only "-s" doesn't help then,
+ # because make has helpfully added "-w" to MAKEFLAGS automatically.
+ # Unfortunately we do not require GNU make other than for building
+ # and testing, so let's just grep known text explicitly echoed by
+ # the rule.
+ while ${MAKE-make} -s -f Makefile.$$ all | grep Touching > /dev/null; do
sleep 1
done 2>&1
rm -f Makefile.$$
# this script. By re-execing it, we ensure that the appropriate
# dependencies and rules will be used.
touch_files_reexec () {
- echo "Adjusting file timestamps"
- exec ${CONFIG_SHELL-/bin/sh} $self --touch
+ chat "Adjusting file timestamps"
+ exec ${CONFIG_SHELL-/bin/sh} $self ${silent+"--silent"} --touch
}
# This functions applies a patch to an existing tree.
apply_patch () {
- if [ -f $1 ]; then
+ if [ -f "$1" ]; then
echo "Applying patch file $1"
- case "$1" in
+ case $1 in
*gz)
- gzip -d -c $1 | patch -p1 ;;
+ gzip -d -c "$1" | patch -p1 ;;
*bz2)
- bzip2 -d -c $1 | patch -p1 ;;
+ bzip2 -d -c "$1" | patch -p1 ;;
*)
- cat $1 | patch -p1 ;;
+ patch -p1 < "$1";;
esac
fi
touch_files_reexec
exit
fi
+case "$1" in
+--silent)
+ silent=t
+ shift
+ ;;
+esac
+
case "$1" in
# First of all, check whether we are going to process a patch.
--patch)
esac
-# Check whether this indeed looks like a local CVS tree.
-if [ ! -d CVS ]; then
- echo "This does not seem to be a GCC CVS tree!"
+# Check for known version control systems.
+if [ -d .git ] || [ -f .git ]; then
+ GCC_GIT=${GCC_GIT-${GIT-git}}
+ vcs_type="git"
+elif [ -d .hg ]; then
+ GCC_HG=${GCC_HG-${HG-hg}}
+ vcs_type="hg"
+elif [ -d .svn ]; then
+ GCC_SVN=${GCC_SVN-${SVN-svn}}
+ vcs_type="svn"
+else
+ echo "This does not seem to be a GCC GIT/HG/SVN tree!"
exit
fi
set -- $UPDATE_OPTIONS ${1+"$@"}
fi
-echo "Updating CVS tree"
-cvs -q update ${1+"$@"}
-if [ $? -ne 0 ]; then
- (touch_files_reexec)
- echo "CVS update of full tree failed." >&2
- exit 1
-fi
+case $vcs_type in
+ git)
+ chat "Updating GIT tree"
+
+ $GCC_GIT diff --quiet --exit-code HEAD
+ if [ $? -ne 0 ]; then
+ echo "Attempting to update a dirty git tree!" >&2
+ echo "Commit or stash your changes first and retry." >&2
+ exit 1
+ fi
+
+ $GCC_GIT pull ${silent+-q} --rebase ${1+"$@"}
+ if [ $? -ne 0 ]; then
+ (touch_files_reexec)
+ echo "git pull of full tree failed." >&2
+ exit 1
+ fi
+
+ revision=`$GCC_GIT log -n1 --pretty=%p:%t:%H`
+ branch=`$GCC_GIT name-rev --name-only HEAD || :`
+ ;;
+
+ hg)
+ chat "Updating HG tree"
+
+ # Add -q so untracked files aren't listed.
+ if [ `$GCC_HG status -q | wc -l` -gt 0 ]; then
+ echo "Attempting to update a dirty hg tree!" >&2
+ echo "Commit or revert your changes first and retry." >&2
+ exit 1
+ fi
+ # Check for mq extension. mq patches must be popped so tip has
+ # been converted from the SVN tree.
+ if [ -d .hg/patches ] && [ `$GCC_HG qapplied | wc -l` -gt 0 ]; then
+ # FIXME: Perhaps pop queue instead? We could do that since we
+ # know the tree is clean.
+ echo "Attempting to update hg tree with mq patches applied!" >&2
+ echo "Pop your patches first and retry." >&2
+ exit 1
+ fi
+
+ # Update tree, but make sure to only pull the default branch.
+ # Otherwise all branches in the upstream repo are added, even if
+ # only a single one has been cloned.
+ $GCC_HG pull ${silent+-q} -r`$GCC_HG branch` ${1+"$@"}
+ if [ $? -ne 0 ]; then
+ (touch_files_reexec)
+ echo "hg pull of full tree failed." >&2
+ exit 1
+ fi
+
+ # Update tree. Needs to be done separately from pull so
+ # gcc_update -rREV works.
+ $GCC_HG update ${silent+-q} ${1+"$@"}
+ if [ $? -ne 0 ]; then
+ (touch_files_reexec)
+ echo "hg update of full tree failed." >&2
+ exit 1
+ fi
+
+ # Extract SVN revision corresponding to parents, as stored by
+ # hg convert. Before hg 1.4.3, there's no template keyword
+ # corresponding to the extra: tag, so need to use hg log --debug
+ # to extract the info.
+ parents=`$GCC_HG parents --template '{rev}'`
+ convert_revision=`$GCC_HG log --debug -r$parents | \
+ sed -ne "/^extra:.*convert_revision=svn:/ {
+ s%^[^/]*/%%
+ p
+ }"`
+ revision=`echo $convert_revision | sed -e 's/.*@//'`
+ branch=`echo $convert_revision | sed -e 's%branches/%%' -e 's/@.*//'`
+ ;;
+
+ svn)
+ chat "Updating SVN tree"
+
+ $GCC_SVN ${silent+-q} --non-interactive update ${1+"$@"}
+ if [ $? -ne 0 ]; then
+ (touch_files_reexec)
+ echo "SVN update of full tree failed." >&2
+ exit 1
+ fi
+
+ revision=`$GCC_SVN info | awk '/Revision:/ { print $2 }'`
+ branch=`$GCC_SVN info | sed -ne "/^URL:/ {
+ s,.*/trunk,trunk,
+ s,.*/branches/,,
+ s,.*/tags/,,
+ p
+ }"`
+ ;;
+esac
+
+rm -f LAST_UPDATED gcc/REVISION
{
- date
- TZ=UTC date
+ date
+ echo "`TZ=UTC date` (revision $revision)"
} > LAST_UPDATED
+echo "[$branch revision $revision]" > gcc/REVISION
+
touch_files_reexec