dev-embedded/avarice: fix implicit function declarations in configure logs

Patch configure.ac for clang 16.
Update EAPI 7 -> 8.

Closes: https://bugs.gentoo.org/900687
Signed-off-by: Viorel Munteanu <ceamac@gentoo.org>

dev-embedded/avarice/avarice-2.14-r1.ebuild

@@ -0,0 +1,36 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit autotools flag-o-matic
+
+DESCRIPTION="Interface for GDB to Atmel AVR JTAGICE in circuit emulator"
+HOMEPAGE="https://avarice.sourceforge.net/"
+SRC_URI="mirror://sourceforge/${PN}/${P}.tar.bz2"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-broken-__unused-macro.patch
+	"${FILESDIR}"/${P}-implicit-function-declarations.patch
+)
+
+src_prepare() {
+	default
+	eautoreconf
+}
+
+src_configure() {
+	# bug #788295
+	append-cxxflags -std=c++14
+
+	default
+}
+
+src_install() {
+	default
+	dodoc doc/*.txt
+}

dev-embedded/avarice/files/avarice-2.14-implicit-function-declarations.patch

@@ -0,0 +1,24 @@
+Bug: https://bugs.gentoo.org/900687
+Upstream patch: https://sourceforge.net/p/avarice/patches/41/
+
+--- a/configure.ac
++++ b/configure.ac
+@@ -97,7 +97,7 @@
+ 
+ # Checks for header files.
+ AC_HEADER_STDC
+-AC_CHECK_HEADERS([arpa/inet.h fcntl.h netdb.h netinet/in.h stdlib.h string.h sys/socket.h sys/time.h termios.h unistd.h])
++AC_CHECK_HEADERS([arpa/inet.h fcntl.h netdb.h netinet/in.h stdlib.h string.h sys/socket.h sys/stat.h sys/time.h termios.h unistd.h])
+ 
+ AC_CHECK_HEADERS([bfd.h], , [ac_found_bfd_h=no])
+ 
+@@ -142,6 +142,9 @@
+ AC_MSG_CHECKING([whether libbfd requires libdl])
+ AC_LINK_IFELSE(
+   [AC_LANG_SOURCE([#include <bfd.h>
++   #ifndef bfd_get_section_name
++   extern bfd_get_section_name(bfd *abfd, const char *name);
++   #endif
+   bfd *file;
+   int main(void) {
+     bfd_init();