dev-scheme/elk: Mark as C17, enable parallel build

Package uses C function polymorphism, can't be ported to C23
without rewrite due to interpreter functions accepting func pointer
with one or two arguments, depending on function.
Fixes dependency ordering in makefiles, allowing parallel build.
Enables tests when build with gcc, as comment about 1. them beingrun
and 2. them failing if run from default test runner is false. But
noted-flaky test always fails when build with clang.
Fix fpurge problem on musl systems as we did for zsh

Closes: https://bugs.gentoo.org/943984
Closes: https://bugs.gentoo.org/936285
Bug: https://bugs.gentoo.org/880349
Bug: https://bugs.gentoo.org/942412
Signed-off-by: NHOrus <jy6x2b32pie9@yahoo.com>
Part-of: https://codeberg.org/gentoo/gentoo/pulls/422
Merges: https://codeberg.org/gentoo/gentoo/pulls/422
Signed-off-by: Sam James <sam@gentoo.org>

dev-scheme/elk/elk-3.99.8-r3.ebuild

@@ -0,0 +1,54 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit autotools flag-o-matic toolchain-funcs
+
+DESCRIPTION="Scheme implementation designed to be embeddable extension to C/C++ applications"
+HOMEPAGE="http://sam.zoy.org/elk/"
+SRC_URI="http://sam.zoy.org/elk/${P}.tar.bz2"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-implicit-int-incompat-ptr.patch
+	"${FILESDIR}"/${P}-implicit-function.patch
+	"${FILESDIR}"/${P}-c99-build-fix.patch
+	"${FILESDIR}"/${P}-makefile-ordering.patch
+	"${FILESDIR}"/${P}-fpurge.patch
+)
+
+src_prepare() {
+	default
+	eautoreconf
+}
+
+src_configure() {
+	#uses functional polymorphism, can't be ported to C23
+	append-cflags -std=gnu17
+
+	econf --disable-static
+}
+
+src_test() {
+	# gc test is noted flakey and always fails when build with clang
+	if tc-is-gcc; then
+		emake check
+	fi
+}
+
+src_install() {
+	# parallel install is broken
+	emake -j1 DESTDIR="${D}" \
+		docsdir="${EPREFIX}"/usr/share/doc/${PF} \
+		examplesdir="${EPREFIX}"/usr/share/doc/${PF}/examples \
+		install
+	einstalldocs
+	docompress -x /usr/share/doc/${PF}
+
+	# no static archives
+	find "${D}" -name '*.la' -delete || die
+}

dev-scheme/elk/files/elk-3.99.8-fpurge.patch

@@ -0,0 +1,36 @@
+Inspired by https://github.com/gentoo/gentoo/commit/cd306dc1d9273c423759a74166f9805ac8e8b5dd
+Fix fpurge on musl
+https://bugs.gentoo.org/936285
+--- a/configure.ac
++++ b/configure.ac
+@@ -316,7 +316,7 @@
+ #    tiocflush   use TIOCFLUSH ioctl from <sys/ioctl.h>
+ #    tcflsh      use TCFLSH ioctl from <termio.h>
+ # Leave the variable(s) empty if flushing is not supported.
+-AC_CHECK_FUNCS(fpurge)
++AC_CHECK_DECLS(fpurge)
+ 
+ AC_CACHE_CHECK([for BSD-style flushing],
+   [ac_cv_have_bsd_flush],
+--- a/src/print.c
++++ b/src/print.c
+@@ -205,7 +205,7 @@
+     if (PORT(port)->flags & P_STRING)
+         return;
+     f = PORT(port)->file;
+-#if defined(HAVE_FPURGE)
++#if HAVE_DELC_FPURGE
+     (void)fpurge (f);
+ #elif defined(HAVE_BSD_FLUSH)
+     f->_cnt = 0;
+--- a/src/read.c
++++ b/src/read.c
+@@ -144,7 +144,7 @@
+     if (PORT(port)->flags & P_STRING)
+         return;
+     f = PORT(port)->file;
+-#if defined(HAVE_FPURGE)
++#if HAVE_DECL_FPURGE
+     (void)fpurge (f);
+ #elif defined(HAVE_BSD_FLUSH)
+     f->_cnt = 0;

dev-scheme/elk/files/elk-3.99.8-makefile-ordering.patch

@@ -0,0 +1,23 @@
+Fix ordering problems, allow parallel build.
+https://bugs.gentoo.org/880349
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -1,6 +1,6 @@
+ NULL = 
+ 
+-SUBDIRS = include src lib scm doc examples test
++SUBDIRS = . include src lib scm doc examples test
+ DIST_SUBDIRS = $(SUBDIRS)
+ 
+ EXTRA_DIST = \
+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -66,7 +66,7 @@
+ 	$(NULL)
+ 
+ bin_PROGRAMS = elk
+-elk_LDADD = $(top_builddir)/src/libelk.la
++elk_LDADD = libelk.la
+ elk_SOURCES = main.c
+ 
+ install-exec-hook: