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When no gcc but clang can be found, fallback to the latter instead of
failing the tests.

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atf_test_case defaults__build_and_install
defaults__build_and_install_body() {
	create_c_module module1 first
	create_c_module module2 second

	CC=gcc
	if [ ! -e /usr/bin/gcc -a -e /usr/bin/clang ]; then
		export HAVE_LLVM=yes
		CC=clang
	fi

	cat >Makefile <<EOF
LIB = two-modules
SRCS = module1.c module2.c
.include <bsd.lib.mk>
EOF

	atf_check -o ignore make
	mkdir -p root/usr/lib
	mkdir -p root/usr/libdata/lint
	create_make_conf mk.conf owngrp DESTDIR="$(pwd)/root"
	atf_check -o ignore make install

	create_main_using_modules main.c module1.h:first module2.h:second
	atf_check -o ignore ${CC} -I. -Lroot/usr/lib -o main main.c -ltwo-modules

	atf_check -o inline:'module1\nmodule2\n' ./main
}

atf_init_test_cases() {
	atf_add_test_case defaults__build_and_install
}