dev-lang/tcc: fix building with clang

* fix building tcc with clang
* allow using tcc as system compiler
* update to EAPI 6

Gentoo-Bug: https://bugs.gentoo.org/502452

Package-Manager: portage-2.2.26

dev-lang/tcc/files/clang.patch

@@ -0,0 +1,18 @@
+# Fixes the default linker options for portage
+# Upstream commit ba286136bf8e48c71ffd6c2fd9ce97e64a6eeeb1
+
+diff --git a/libtcc.c b/libtcc.c
+index 127806f..dc78643 100644
+--- a/libtcc.c
++++ b/libtcc.c
+@@ -1560,6 +1560,10 @@ static int tcc_set_linker(TCCState *s, const char *option)
+             } else
+                 goto err;
+
++        } else if (link_option(option, "as-needed", &p)) {
++            ignoring = 1;
++        } else if (link_option(option, "O", &p)) {
++            ignoring = 1;
+         } else if (link_option(option, "rpath=", &p)) {
+             s->rpath = copy_linker_arg(p);
+         } else if (link_option(option, "section-alignment=", &p)) {

dev-lang/tcc/files/linker.patch

@@ -0,0 +1,18 @@
+# Fix compiling tcc with clang. Upstream commit 73ac39c317a20accaf3b25ba833deee0c2e2849f
+# Gentoo bug #502452
+diff --git a/lib/libtcc1.c b/lib/libtcc1.c
+index cf9babf..b46fb5d 100644
+--- a/lib/libtcc1.c
++++ b/lib/libtcc1.c
+@@ -647,6 +647,11 @@ struct __va_list_struct {
+     char *reg_save_area;
+ };
+
++#undef __va_start
++#undef __va_arg
++#undef __va_copy
++#undef __va_end
++
+ void *__va_start(void *fp)
+ {
+     struct __va_list_struct *ap =

dev-lang/tcc/tcc-0.9.26-r3.ebuild

@@ -0,0 +1,72 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI="6"
+
+inherit toolchain-funcs
+
+DESCRIPTION="A very small C compiler for ix86/amd64"
+HOMEPAGE="http://bellard.org/tcc/"
+SRC_URI="http://download.savannah.gnu.org/releases/tinycc/${P}.tar.bz2"
+
+LICENSE="LGPL-2.1"
+SLOT="0"
+KEYWORDS="~amd64 ~x86 ~amd64-linux"
+
+DEPEND="dev-lang/perl" # doc generation
+# Both tendra and tinycc install /usr/bin/tcc
+RDEPEND="!dev-lang/tendra"
+IUSE="test"
+
+src_prepare() {
+	# Don't strip
+	sed -i -e 's|$(INSTALL) -s|$(INSTALL)|' Makefile || die
+
+	# Fix examples
+	sed -i -e '1{
+		i#! /usr/bin/tcc -run
+		/^#!/d
+	}' examples/ex*.c || die
+	sed -i -e '1s/$/ -lX11/' examples/ex4.c || die
+
+	# Fix texi2html invocation
+	sed -i -e 's/-number//' Makefile || die
+	sed -i -e 's/--sections//' Makefile || die
+
+	# Fix compiling tcc with clang
+	eapply "${FILESDIR}"/clang.patch
+
+	# Allows using tcc as the system compiler for Gentoo
+	eapply "${FILESDIR}"/linker.patch
+
+	eapply_user
+}
+
+src_configure() {
+	use test && unset CFLAGS LDFLAGS # Tests run with CC=tcc etc, they will fail hard otherwise
+					# better fixes welcome, it feels wrong to hack the env like this
+	# not autotools, so call configure directly
+	./configure --cc="$(tc-getCC)" \
+		--prefix="${EPREFIX}/usr" \
+		--libdir="${EPREFIX}/usr/$(get_libdir)" \
+		--docdir="${EPREFIX}/usr/share/doc/${PF}"
+}
+
+src_compile() {
+	emake AR="$(tc-getAR)"
+}
+
+src_install() {
+	emake DESTDIR="${D}" install
+
+	dodoc Changelog README TODO VERSION
+	#dohtml tcc-doc.html
+	exeinto /usr/share/doc/${PF}/examples
+	doexe examples/ex*.c
+}
+
+src_test() {
+	# this is using tcc bits that don't know as-needed etc.
+	TCCFLAGS="" emake test
+}