commit bb484cdad5e0d79176134a4eef8e81092448739a
Author: Jason Merrill <jason@redhat.com>
Date: Thu Apr 25 17:54:17 2013 -0400
* Makefile.in (LLINKER): New variable.
(mostlyclean): Remove link mutex.
* configure.ac: Handle --enable-link-mutex.
* lock-and-run.sh: New script.
new file mode 100644
@@ -0,0 +1,29 @@
+#! /bin/sh
+# Shell-based mutex using mkdir.
+
+lockdir=$1 prog=$2; shift 2 || exit 1
+count=0
+# Remember when we started trying to acquire the lock.
+touch lock-stamp.$$
+trap 'rm -r "$lockdir" lock-stamp.$$' 0
+until mkdir "$lockdir" 2>/dev/null; do
+ # Say something periodically so the user knows what's up.
+ if [ `expr $count % 30` = 0 ]; then
+ # Reset if the lock has been renewed.
+ if [ -n "`find \"$lockdir\" -newer lock-stamp.$$`" ]; then
+ touch lock-stamp.$$
+ count=1
+ # Steal the lock after 5 minutes.
+ elif [ $count == 300 ]; then
+ echo removing stale $lockdir >&2
+ rm -r "$lockdir"
+ else
+ echo waiting to acquire $lockdir >&2
+ fi
+ fi
+ sleep 1
+ count=`expr $count + 1`
+done
+echo $prog "$@"
+$prog "$@"
+# The trap runs on exit.
@@ -235,6 +235,13 @@ LINKER = $(CC)
LINKER_FLAGS = $(CFLAGS)
endif
+# Like LINKER, but use a mutex for serializing front end links.
+ifeq (@DO_LINK_MUTEX@,true)
+LLINKER = $(SHELL) $(srcdir)/lock-and-run.sh linkfe.lck $(LINKER)
+else
+LLINKER = $(LINKER)
+endif
+
# -------------------------------------------
# Programs which operate on the build machine
# -------------------------------------------
@@ -4529,6 +4536,8 @@ mostlyclean: lang.mostlyclean
-rm -f gtype.state
# Delete genchecksum outputs
-rm -f *-checksum.c
+# Delete lock-and-run bits
+ -rm -rf linkfe.lck lock-stamp.*
# Delete all files made by compilation
# that don't exist in the distribution.
@@ -185,6 +185,7 @@ endif
GCC_LINKERFLAGS = $(filter-out -Werror, $(ALL_LINKERFLAGS))
GCC_LINK=$(LINKER) $(GCC_LINKERFLAGS) $(LDFLAGS)
+GCC_LLINK=$(LLINKER) $(GCC_LINKERFLAGS) $(LDFLAGS)
# Lists of files for various purposes.
@@ -562,7 +563,8 @@ TARGET_ADA_SRCS =
# Since the RTL should be built with the latest compiler, remove the
# stamp target in the parent directory whenever gnat1 is rebuilt
gnat1$(exeext): $(TARGET_ADA_SRCS) $(GNAT1_OBJS) $(ADA_BACKEND) libcommon-target.a $(LIBDEPS)
- +$(GCC_LINK) -o $@ $(GNAT1_OBJS) $(ADA_BACKEND) libcommon-target.a $(LIBS) $(SYSLIBS) $(BACKENDLIBS) $(CFLAGS)
+ +$(GCC_LLINK) -o $@ $(GNAT1_OBJS) $(ADA_BACKEND) \
+ libcommon-target.a $(LIBS) $(SYSLIBS) $(BACKENDLIBS) $(CFLAGS)
$(RM) stamp-gnatlib2-rts stamp-tools
gnatbind$(exeext): ada/b_gnatb.o $(CONFIG_H) $(GNATBIND_OBJS) ggc-none.o libcommon-target.a $(LIBDEPS)
@@ -75,7 +75,7 @@ cc1-checksum.c : build/genchecksum$(build_exeext) checksum-options \
cc1-checksum.o : cc1-checksum.c $(CONFIG_H) $(SYSTEM_H)
cc1$(exeext): $(C_OBJS) cc1-checksum.o $(BACKEND) $(LIBDEPS)
- +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ $(C_OBJS) \
+ +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ $(C_OBJS) \
cc1-checksum.o $(BACKEND) $(LIBS) $(BACKENDLIBS)
#
# Build hooks:
@@ -670,6 +670,7 @@ subdirs
dollar
gcc_tooldir
enable_lto
+DO_LINK_MUTEX
MAINT
zlibinc
zlibdir
@@ -916,6 +917,7 @@ with_long_double_128
with_gc
with_system_zlib
enable_maintainer_mode
+enable_link_mutex
enable_version_specific_runtime_libs
enable_plugin
enable_libquadmath_support
@@ -1627,6 +1629,8 @@ Optional Features:
--enable-maintainer-mode
enable make rules and dependencies not useful (and
sometimes confusing) to the casual installer
+ --enable-link-mutex avoid linking multiple front-ends at once to avoid
+ thrashing on the build machine
--enable-version-specific-runtime-libs
specify that runtime libraries should be installed
in a compiler-specific directory
@@ -17830,7 +17834,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 17833 "configure"
+#line 17837 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -17936,7 +17940,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 17939 "configure"
+#line 17943 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -27061,6 +27065,26 @@ else
MAINT='#'
fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to avoid linking multiple front-ends at once" >&5
+$as_echo_n "checking whether to avoid linking multiple front-ends at once... " >&6; }
+ # Check whether --enable-link-mutex was given.
+if test "${enable_link_mutex+set}" = set; then :
+ enableval=$enable_link_mutex; do_link_mutex=$enableval
+else
+ do_link_mutex=no
+fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $do_link_mutex" >&5
+$as_echo "$do_link_mutex" >&6; }
+
+if test "$do_link_mutex" = "yes"; then
+ DO_LINK_MUTEX=true
+else
+ DO_LINK_MUTEX=false
+fi
+
+
# --------------
# Language hooks
# --------------
@@ -4958,6 +4958,24 @@ else
fi
AC_SUBST(MAINT)dnl
+dnl Whether to prevent multiple front-ends from linking at the same time
+
+AC_MSG_CHECKING([whether to avoid linking multiple front-ends at once])
+ AC_ARG_ENABLE(link-mutex,
+[AS_HELP_STRING([--enable-link-mutex],
+ [avoid linking multiple front-ends at once to avoid thrashing
+ on the build machine])],
+ do_link_mutex=$enableval,
+ do_link_mutex=no)
+AC_MSG_RESULT($do_link_mutex)
+
+if test "$do_link_mutex" = "yes"; then
+ DO_LINK_MUTEX=true
+else
+ DO_LINK_MUTEX=false
+fi
+AC_SUBST(DO_LINK_MUTEX)
+
# --------------
# Language hooks
# --------------
@@ -100,7 +100,7 @@ cc1plus-checksum.c : build/genchecksum$(build_exeext) checksum-options \
cc1plus-checksum.o : cc1plus-checksum.c $(CONFIG_H) $(SYSTEM_H)
cc1plus$(exeext): $(CXX_OBJS) cc1plus-checksum.o $(BACKEND) $(LIBDEPS)
- +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
+ +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
$(CXX_OBJS) cc1plus-checksum.o $(BACKEND) $(LIBS) $(BACKENDLIBS)
ifeq ($(ENABLE_MAINTAINER_RULES), true)
@@ -1293,6 +1293,11 @@ opposite effect. If neither option is specified, the configure script
will try to guess whether the @code{.init_array} and
@code{.fini_array} sections are supported and, if they are, use them.
+@item --enable-link-mutex
+When building GCC, use a mutex to avoid linking the compilers for
+multiple languages at the same time, to avoid thrashing on build
+systems with limited free memory. The default is not to use such a mutex.
+
@item --enable-maintainer-mode
The build rules that regenerate the Autoconf and Automake output files as
well as the GCC master message catalog @file{gcc.pot} are normally
@@ -98,7 +98,7 @@ gfortran-cross$(exeext): gfortran$(exeext)
# The compiler itself is called f951.
f951$(exeext): $(F95_OBJS) \
$(BACKEND) $(LIBDEPS) attribs.o
- +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
+ +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
$(F95_OBJS) $(BACKEND) $(ZLIB) $(LIBS) attribs.o \
$(BACKENDLIBS)
@@ -76,7 +76,7 @@ GO_OBJS = \
go/unsafe.o
go1$(exeext): $(GO_OBJS) attribs.o $(BACKEND) $(LIBDEPS)
- +$(CXX) $(ALL_CXXFLAGS) $(LDFLAGS) -o $@ \
+ +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
$(GO_OBJS) attribs.o $(BACKEND) $(LIBS) $(BACKENDLIBS)
# Documentation.
@@ -99,7 +99,7 @@ jvspec.o-warn = -Wno-error
jc1$(exeext): $(JAVA_OBJS) $(BACKEND) $(LIBDEPS) attribs.o
rm -f $@
- +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
+ +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
$(JAVA_OBJS) $(BACKEND) $(ZLIB) $(LIBICONV) $(LIBS) attribs.o $(BACKENDLIBS)
jcf-dump$(exeext): $(JCFDUMP_OBJS) $(LIBDEPS)
@@ -71,7 +71,7 @@ lto.stagefeedback:
lto-warn = $(STRICT_WARN)
$(LTO_EXE): $(LTO_OBJS) $(BACKEND) $(LIBDEPS)
- +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
+ +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
$(LTO_OBJS) $(BACKEND) $(BACKENDLIBS) $(LIBS)
# Dependencies
@@ -68,7 +68,7 @@ cc1obj-checksum.c : build/genchecksum$(build_exeext) checksum-options \
cc1obj-checksum.o : cc1obj-checksum.c $(CONFIG_H) $(SYSTEM_H)
cc1obj$(exeext): $(OBJC_OBJS) $(C_AND_OBJC_OBJS) cc1obj-checksum.o $(BACKEND) $(LIBDEPS)
- +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
+ +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
$(OBJC_OBJS) $(C_AND_OBJC_OBJS) cc1obj-checksum.o \
$(BACKEND) $(LIBS) $(BACKENDLIBS)
@@ -72,7 +72,7 @@ cc1objplus-checksum.c : build/genchecksum$(build_exeext) checksum-options \
cc1objplus-checksum.o : cc1objplus-checksum.c $(CONFIG_H) $(SYSTEM_H)
cc1objplus$(exeext): $(OBJCXX_OBJS) cc1objplus-checksum.o $(BACKEND) $(LIBDEPS)
- +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
+ +$(LLINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
$(OBJCXX_OBJS) cc1objplus-checksum.o $(BACKEND) $(LIBS) $(BACKENDLIBS)
# Objective C++ language specific files.