gccgo: link static libgo against -lrt on GNU/Linux

The upcoming Go 1.18 release requires linking against -lrt on GNU/Linux
(only) in order to call timer_create and friends.

Also change gotools to link the runtime test against -lrt.

	* gospec.cc (RTLIB, RT_LIBRARY): Define.
	(lang_specific_driver): Add -lrt if linking statically on
	GNU/Linux.

	* configure.ac (RT_LIBS): Define.
	* Makefile.am (check-runtime): Set GOLIBS to $(RT_LIBS).
	* configure, Makefile.in: Regenerate.

4 files changed, 23 insertions, 2 deletions

diff --git a/gotools/Makefile.am b/gotools/Makefile.am
index 199899b9ef0..9e81024ea78 100644
--- a/gotools/Makefile.am
+++ b/gotools/Makefile.am
@@ -246,12 +246,14 @@ check-runtime: go$(EXEEXT) $(noinst_PROGRAMS) check-head check-gccgo check-gcc
 	GOARCH=`$(abs_builddir)/go$(EXEEXT) env GOARCH`; \
 	GOOS=`$(abs_builddir)/go$(EXEEXT) env GOOS`; \
 	files=`$(SHELL) $(libgosrcdir)/../match.sh --goarch=$${GOARCH} --goos=$${GOOS} --srcdir=$(libgosrcdir)/runtime --extrafiles="$(libgodir)/runtime_linknames.go $(libgodir)/runtime_sysinfo.go $(libgodir)/sigtab.go $(libgodir)/goroot.go" --tag=libffi`; \
-	echo "$(ECHO_ENV) GC='$(abs_builddir)/check-gccgo -fgo-compiling-runtime' GOARCH=$${GOARCH} GOOS=$${GOOS} $(SHELL) $(libgosrcdir)/../testsuite/gotest --goarch=$${GOARCH} --goos=$${GOOS} --basedir=$(libgosrcdir)/.. --srcdir=$(libgosrcdir)/runtime --pkgpath=runtime --pkgfiles='$${files}' $(GOTESTFLAGS) -test.timeout=$(GOTOOLS_TEST_TIMEOUT)s -test.v" > runtime-testlog
+	echo "$(ECHO_ENV) GC='$(abs_builddir)/check-gccgo -fgo-compiling-runtime' GOARCH=$${GOARCH} GOOS=$${GOOS} GOLIBS='$(RT_LIBS)' $(SHELL) $(libgosrcdir)/../testsuite/gotest --goarch=$${GOARCH} --goos=$${GOOS} --basedir=$(libgosrcdir)/.. --srcdir=$(libgosrcdir)/runtime --pkgpath=runtime --pkgfiles='$${files}' $(GOTESTFLAGS) -test.timeout=$(GOTOOLS_TEST_TIMEOUT)s -test.v" > runtime-testlog
 	$(CHECK_ENV) \
 	GC="$${GCCGO} -fgo-compiling-runtime"; \
 	export GC; \
 	GOARCH=`$(abs_builddir)/go$(EXEEXT) env GOARCH`; \
 	GOOS=`$(abs_builddir)/go$(EXEEXT) env GOOS`; \
+	GOLIBS="$(RT_LIBS)"; \
+	export GOLIBS; \
 	files=`$(SHELL) $(libgosrcdir)/../match.sh --goarch=$${GOARCH} --goos=$${GOOS} --srcdir=$(libgosrcdir)/runtime --extrafiles="$(libgodir)/runtime_linknames.go $(libgodir)/runtime_sysinfo.go $(libgodir)/sigtab.go $(libgodir)/goroot.go" --tag=libffi`; \
 	$(SHELL) $(libgosrcdir)/../testsuite/gotest --goarch=$${GOARCH} --goos=$${GOOS} --basedir=$(libgosrcdir)/.. --srcdir=$(libgosrcdir)/runtime --pkgpath=runtime --pkgfiles="$${files}" $(GOTESTFLAGS) -test.timeout=$(GOTOOLS_TEST_TIMEOUT)s -test.v >> runtime-testlog 2>&1 || echo "--- $${fl}: go test runtime (0.00s)" >> runtime-testlog
 	grep '^--- ' runtime-testlog | sed -e 's/^--- \(.*\) ([^)]*)$$/\1/' | sort -k 2
diff --git a/gotools/Makefile.in b/gotools/Makefile.in
index e2c30bf15ff..8a19f6f3a7a 100644
--- a/gotools/Makefile.in
+++ b/gotools/Makefile.in
@@ -269,6 +269,7 @@ PACKAGE_TARNAME = @PACKAGE_TARNAME@
 PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
+RT_LIBS = @RT_LIBS@
 SET_MAKE = @SET_MAKE@
 SHELL = @SHELL@
 STRIP = @STRIP@
@@ -917,12 +918,14 @@ mostlyclean-local:
 @NATIVE_TRUE@	GOARCH=`$(abs_builddir)/go$(EXEEXT) env GOARCH`; \
 @NATIVE_TRUE@	GOOS=`$(abs_builddir)/go$(EXEEXT) env GOOS`; \
 @NATIVE_TRUE@	files=`$(SHELL) $(libgosrcdir)/../match.sh --goarch=$${GOARCH} --goos=$${GOOS} --srcdir=$(libgosrcdir)/runtime --extrafiles="$(libgodir)/runtime_linknames.go $(libgodir)/runtime_sysinfo.go $(libgodir)/sigtab.go $(libgodir)/goroot.go" --tag=libffi`; \
-@NATIVE_TRUE@	echo "$(ECHO_ENV) GC='$(abs_builddir)/check-gccgo -fgo-compiling-runtime' GOARCH=$${GOARCH} GOOS=$${GOOS} $(SHELL) $(libgosrcdir)/../testsuite/gotest --goarch=$${GOARCH} --goos=$${GOOS} --basedir=$(libgosrcdir)/.. --srcdir=$(libgosrcdir)/runtime --pkgpath=runtime --pkgfiles='$${files}' $(GOTESTFLAGS) -test.timeout=$(GOTOOLS_TEST_TIMEOUT)s -test.v" > runtime-testlog
+@NATIVE_TRUE@	echo "$(ECHO_ENV) GC='$(abs_builddir)/check-gccgo -fgo-compiling-runtime' GOARCH=$${GOARCH} GOOS=$${GOOS} GOLIBS='$(RT_LIBS)' $(SHELL) $(libgosrcdir)/../testsuite/gotest --goarch=$${GOARCH} --goos=$${GOOS} --basedir=$(libgosrcdir)/.. --srcdir=$(libgosrcdir)/runtime --pkgpath=runtime --pkgfiles='$${files}' $(GOTESTFLAGS) -test.timeout=$(GOTOOLS_TEST_TIMEOUT)s -test.v" > runtime-testlog
 @NATIVE_TRUE@	$(CHECK_ENV) \
 @NATIVE_TRUE@	GC="$${GCCGO} -fgo-compiling-runtime"; \
 @NATIVE_TRUE@	export GC; \
 @NATIVE_TRUE@	GOARCH=`$(abs_builddir)/go$(EXEEXT) env GOARCH`; \
 @NATIVE_TRUE@	GOOS=`$(abs_builddir)/go$(EXEEXT) env GOOS`; \
+@NATIVE_TRUE@	GOLIBS="$(RT_LIBS)"; \
+@NATIVE_TRUE@	export GOLIBS; \
 @NATIVE_TRUE@	files=`$(SHELL) $(libgosrcdir)/../match.sh --goarch=$${GOARCH} --goos=$${GOOS} --srcdir=$(libgosrcdir)/runtime --extrafiles="$(libgodir)/runtime_linknames.go $(libgodir)/runtime_sysinfo.go $(libgodir)/sigtab.go $(libgodir)/goroot.go" --tag=libffi`; \
 @NATIVE_TRUE@	$(SHELL) $(libgosrcdir)/../testsuite/gotest --goarch=$${GOARCH} --goos=$${GOOS} --basedir=$(libgosrcdir)/.. --srcdir=$(libgosrcdir)/runtime --pkgpath=runtime --pkgfiles="$${files}" $(GOTESTFLAGS) -test.timeout=$(GOTOOLS_TEST_TIMEOUT)s -test.v >> runtime-testlog 2>&1 || echo "--- $${fl}: go test runtime (0.00s)" >> runtime-testlog
 @NATIVE_TRUE@	grep '^--- ' runtime-testlog | sed -e 's/^--- \(.*\) ([^)]*)$$/\1/' | sort -k 2
diff --git a/gotools/configure b/gotools/configure
index ff71d2ae880..5b667227de2 100755
--- a/gotools/configure
+++ b/gotools/configure
@@ -586,6 +586,7 @@ ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
+RT_LIBS
 NET_LIBS
 NATIVE_FALSE
 NATIVE_TRUE
@@ -4211,6 +4212,12 @@ if test "$ac_res" != no; then :
 fi
 
 
+RT_LIBS=
+case ${target} in
+  *-*-linux*) RT_LIBS=-lrt ;;
+esac
+
+
 ac_config_files="$ac_config_files Makefile"
 
 
diff --git a/gotools/configure.ac b/gotools/configure.ac
index f0a73eca782..bf2395f7cf6 100644
--- a/gotools/configure.ac
+++ b/gotools/configure.ac
@@ -85,6 +85,15 @@ dnl Test if -lrt is required for sched_yield and/or nanosleep.
 AC_SEARCH_LIBS([sched_yield], [rt])
 AC_SEARCH_LIBS([nanosleep], [rt])
 
+dnl On GNU/Linux we need to link the runtime package against -lrt.
+dnl This is a target test, unlike sched_yield/nanosleep above
+dnl which is a host test.
+RT_LIBS=
+case ${target} in
+  *-*-linux*) RT_LIBS=-lrt ;;
+esac
+AC_SUBST(RT_LIBS)
+
 AC_CONFIG_FILES(Makefile)
 
 AC_OUTPUT