Add MK_GOOGLETEST option for building/installing gmock/gtest

These libraries don't compile on non-C++-11 capable compilers, e.g., g++ 4.2.1
and its corresponding implementation of the c++ library, i.e., libstdc++.

Blacklist compilation on all non-C++-11 capable compilers and give others the
option of opting out of building/installing gmock/gtest via MK_GOOGLETEST.

This option is controlled by MK_CXX and MK_TESTS, as ATF compilation is.

lib/Makefile

@@ -169,6 +169,7 @@ _libcplusplus+=	libc++fs
 .endif
 
 SUBDIR.${MK_EFI}+=	libefivar
+SUBDIR.${MK_GOOGLETEST}+=	googletest
 SUBDIR.${MK_LIBTHR}+=	libthr
 SUBDIR.${MK_LLVM_LIBUNWIND}+=	libgcc_eh
 SUBDIR.${MK_LLVM_LIBUNWIND}+=	libgcc_s
@@ -200,7 +201,6 @@ SUBDIR.${MK_RADIUS_SUPPORT}+=	libradius
 SUBDIR.${MK_SENDMAIL}+=	libmilter libsm libsmdb libsmutil
 SUBDIR.${MK_TELNET}+=	libtelnet
 SUBDIR.${MK_TESTS_SUPPORT}+=	atf
-SUBDIR.${MK_TESTS_SUPPORT}+=	googletest
 SUBDIR.${MK_TESTS}+=	tests
 SUBDIR.${MK_UNBOUND}+=	libunbound
 SUBDIR.${MK_USB}+=	libusbhid libusb

share/man/man5/src.conf.5

@@ -1,6 +1,6 @@
 .\" DO NOT EDIT-- this file is @generated by tools/build/options/makeman.
 .\" $FreeBSD$
-.Dd February 15, 2019
+.Dd February 19, 2019
 .Dt SRC.CONF 5
 .Os
 .Sh NAME
@@ -529,6 +529,8 @@ When set, it enforces these options:
 .It
 .Va WITHOUT_GNUCXX
 .It
+.Va WITHOUT_GOOGLETEST
+.It
 .Va WITHOUT_LLVM_COV
 .It
 .Va WITHOUT_TESTS
@@ -807,6 +809,11 @@ Set to not build GNU
 Set this option to include GNU extensions in
 .Xr bsdgrep 1
 by linking against libgnuregex.
+.It Va WITHOUT_GOOGLETEST
+Set to not build nor install
+.Lb libgmock ,
+.Lb libgtest ,
+and dependent tests.
 .It Va WITHOUT_GPIO
 Set to not build
 .Xr gpioctl 8
@@ -1784,6 +1791,8 @@ When set, it enforces these options:
 .Bl -item -compact
 .It
 .Va WITHOUT_DTRACE_TESTS
+.It
+.Va WITHOUT_GOOGLETEST
 .El
 .Pp
 When set, these options are also in effect:

share/mk/src.opts.mk

@@ -108,6 +108,7 @@ __DEFAULT_YES_OPTIONS = \
     GDB \
     GNU_DIFF \
     GNU_GREP \
+    GOOGLETEST \
     GPIO \
     HAST \
     HTML \
@@ -423,6 +424,7 @@ MK_${var}:=	no
 # Order is somewhat important.
 #
 .if !${COMPILER_FEATURES:Mc++11}
+MK_GOOGLETEST:=	no
 MK_LLVM_LIBUNWIND:=	no
 .endif
 
@@ -505,6 +507,7 @@ MK_FREEBSD_UPDATE:=	no
 
 .if ${MK_TESTS} == "no"
 MK_DTRACE_TESTS:= no
+MK_GOOGLETEST:=	no
 .endif
 
 .if ${MK_ZONEINFO} == "no"

tools/build/options/WITHOUT_GOOGLETEST

@@ -0,0 +1,5 @@
+.\" $FreeBSD$
+Set to not build nor install
+.Lb libgmock ,
+.Lb libgtest ,
+and dependent tests.