dev-libs/libtommath: respect CC in src_test(), bug #547760

While at it added actual test execution.
This package does not run 'make test' by default but only compiles ./test.

Package-Manager: Portage-2.3.6, Repoman-2.3.3

dev-libs/libtommath/libtommath-1.0-r1.ebuild

@@ -0,0 +1,72 @@
+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=5
+
+inherit autotools eutils multilib toolchain-funcs
+
+DESCRIPTION="highly optimized and portable routines for integer theoretic applications"
+HOMEPAGE="http://www.libtom.net/"
+SRC_URI="https://github.com/libtom/libtommath/releases/download/v${PV}/ltm-${PV}.tar.xz"
+
+LICENSE="WTFPL-2"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~x86 ~amd64-fbsd ~x86-fbsd ~amd64-linux ~x86-linux ~ppc-macos"
+IUSE="doc examples static-libs"
+
+DEPEND="sys-devel/libtool"
+RDEPEND=""
+
+src_prepare() {
+	# need libtool for cross compilation. Bug #376643
+	cat <<-EOF > configure.ac
+	AC_INIT(libtommath, 0)
+	AM_INIT_AUTOMAKE
+	LT_INIT
+	AC_CONFIG_FILES(Makefile)
+	AC_OUTPUT
+	EOF
+	touch NEWS README AUTHORS ChangeLog Makefile.am
+	eautoreconf
+	export LT="${S}"/libtool
+}
+
+src_configure() {
+	econf $(use_enable static-libs static)
+}
+
+_emake() {
+	emake \
+		CC="$(tc-getCC)" \
+		AR="$(tc-getAR)" \
+		RANLIB="$(tc-getRANLIB)" \
+		-f makefile.shared \
+		IGNORE_SPEED=1 \
+		LIBPATH="${EPREFIX}/usr/$(get_libdir)" \
+		INCPATH="${EPREFIX}/usr/include" \
+		"$@"
+}
+
+src_compile() {
+	_emake
+}
+
+src_test() {
+	_emake test_standalone
+	./test || die
+}
+
+src_install() {
+	_emake DESTDIR="${D}" install
+	# We only link against -lc, so drop the .la file.
+	find "${ED}" -name '*.la' -delete
+
+	dodoc changes.txt
+
+	use doc && dodoc *.pdf
+
+	if use examples ; then
+		docinto demo
+		dodoc demo/*.c
+	fi
+}