Detect more recent versions of GCC/Clang, too.

Change-Id: I04fc98ff520b49ea6313c335d1c930ce95a995e6

configure.ac

@@ -49,12 +49,12 @@ AS_IF([test "x$enable_rrd_is_thread_safe" != "xno"], [RRDLIB_TO_CHECK=rrd],
       [RRDLIB_TO_CHECK=rrd_th])
 
 # Checks for programs.
-AC_PROG_CC([gcc-7 clang-5.0 gcc clang])
+AC_PROG_CC([gcc-8 gcc-7 clang-6.0 clang-5.0 gcc clang])
 AC_PROG_CC_C99([], [])
 if test "x$ac_cv_prog_cc_c99" = xno; then
   AC_MSG_ERROR([Need a C99-compliant C compiler])
 fi
-AC_PROG_CXX([g++-7 clang++-5.0 g++ clang++])
+AC_PROG_CXX([g++-8 g++-7 clang++-6.0 clang++-5.0 g++ clang++])
 AC_DEFINE_UNQUOTED([BUILD_CXX], ["`$CXX --version | head -n1`"], [C++ compiler])
 AX_CXX_COMPILE_STDCXX([17], [noext], [mandatory])
 AC_PROG_RANLIB

omd/packages/boost/Makefile

@@ -23,7 +23,7 @@ build: check-python
 	tar xzf $(NAME)_$(VERSION).tar.gz
 # basically what part of AC_PROC_CXX does
 	@CXX="" ; \
-	for PROG in g++-7 clang++-5.0 g++-6 clang++-4.0 g++-5 clang++-3.9 clang++-3.8 clang++-3.7 clang++-3.6 clang++-3.5 g++-4.9 g++ clang++; do \
+	for PROG in g++-8 g++-7 clang++-6.0 clang++-5.0 g++-6 clang++-4.0 g++-5 clang++-3.9 clang++-3.8 clang++-3.7 clang++-3.6 clang++-3.5 g++-4.9 g++ clang++; do \
 	    echo -n "checking for $$PROG... "; SAVED_IFS=$$IFS; IFS=: ; \
 	    for DIR in $$PATH; do \
 	        IFS=$$SAVED_IFS ; \

omd/packages/python/Makefile

@@ -51,7 +51,7 @@ sitecustomize.pyc: sitecustomize.py
 # The compiler detection code below is basically what part of AC_PROC_CXX does.
 bin/gcc:
 	@CC="" ; \
-	for PROG in gcc-7 clang-5.0 gcc-6 clang-4.0 gcc-5 clang-3.9 clang-3.8 clang-3.7 clang-3.6 clang-3.5 gcc-4.9 gcc clang; do \
+	for PROG in gcc-8 gcc-7 clang-6.0 clang-5.0 gcc-6 clang-4.0 gcc-5 clang-3.9 clang-3.8 clang-3.7 clang-3.6 clang-3.5 gcc-4.9 gcc clang; do \
 	    echo -n "checking for $$PROG... "; SAVED_IFS=$$IFS; IFS=: ; \
 	    for DIR in $$PATH; do \
 	        IFS=$$SAVED_IFS ; \
@@ -68,7 +68,7 @@ bin/gcc:
 
 bin/g++:
 	@CXX="" ; \
-	for PROG in g++-7 clang++-5.0 g++-6 clang++-4.0 g++-5 clang++-3.9 clang++-3.8 clang++-3.7 clang++-3.6 clang++-3.5 g++-4.9 g++ clang++; do \
+	for PROG in g++-8 g++-7 clang++-6.0 clang++-5.0 g++-6 clang++-4.0 g++-5 clang++-3.9 clang++-3.8 clang++-3.7 clang++-3.6 clang++-3.5 g++-4.9 g++ clang++; do \
 	    echo -n "checking for $$PROG... "; SAVED_IFS=$$IFS; IFS=: ; \
 	    for DIR in $$PATH; do \
 	        IFS=$$SAVED_IFS ; \

omd/packages/re2/Makefile

@@ -12,7 +12,7 @@ DIR      = $(NAME)-$(VERSION)
 build: unpack
 # basically what part of AC_PROC_CXX does
 	@CXX="" ; \
-	for PROG in g++-7 clang++-5.0 g++-6 clang++-4.0 g++-5 clang++-3.9 clang++-3.8 clang++-3.7 clang++-3.6 clang++-3.5 g++-4.9 g++ clang++; do \
+	for PROG in g++-8 g++-7 clang++-6.0 clang++-5.0 g++-6 clang++-4.0 g++-5 clang++-3.9 clang++-3.8 clang++-3.7 clang++-3.6 clang++-3.5 g++-4.9 g++ clang++; do \
 	    echo -n "checking for $$PROG... "; SAVED_IFS=$$IFS; IFS=: ; \
 	    for DIR in $$PATH; do \
 	        IFS=$$SAVED_IFS ; \

standalone.make

@@ -23,8 +23,12 @@
 # Boston, MA 02110-1301 USA.
 
 # TODO(sp) We should really use autotools here...
-ifneq ($(shell which g++-7 2>/dev/null),)
+ifneq ($(shell which g++-8 2>/dev/null),)
+        CXX := g++-8 -std=c++17
+else ifneq ($(shell which g++-7 2>/dev/null),)
         CXX := g++-7 -std=c++17
+else ifneq ($(shell which clang++-6.0 2>/dev/null),)
+        CXX := clang++-6.0 -std=c++17
 else ifneq ($(shell which clang++-5.0 2>/dev/null),)
         CXX := clang++-5.0 -std=c++17
 else ifneq ($(shell which g++ 2>/dev/null),)