sci-electronics/nvc: patch fpurge; drop USE=debug

Closes: https://bugs.gentoo.org/979033
Closes: https://bugs.gentoo.org/978740
Bug: https://bugs.gentoo.org/937245
Signed-off-by: Maciej Barć <xgqt@gentoo.org>

sci-electronics/nvc/files/nvc-1.21.1-fpurge.patch

@@ -0,0 +1,14 @@
+Thanks for the patch Lain! See: https://bugs.gentoo.org/979033
+diff --git a/configure.ac b/configure.ac
+index 3ec2938..5fb9fef 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -37,7 +37,7 @@ AC_C_RESTRICT
+ 
+ AC_CHECK_HEADERS([sys/ptrace.h sys/prctl.h])
+ AC_CHECK_FUNCS([tcgetwinsize memmem strcasestr getline fseeko ftello])
+-AC_CHECK_FUNCS([fpurge __fpurge strchrnul strndup gettid popen])
++AC_CHECK_FUNCS([__fpurge strchrnul strndup gettid popen])
+ 
+ AC_CHECK_MEMBERS([struct stat.st_mtimespec.tv_nsec])
+ AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec])

sci-electronics/nvc/nvc-1.21.1-r1.ebuild

@@ -5,7 +5,7 @@ EAPI=8
 
 LLVM_COMPAT=( {20..22} )
 
-inherit autotools bash-completion-r1 llvm-r2
+inherit autotools llvm-r2 shell-completion
 
 DESCRIPTION="NVC is a VHDL compiler and simulator"
 HOMEPAGE="https://www.nickg.me.uk/nvc/
@@ -29,7 +29,7 @@ S="${NVC_BUILDDIR}"
 
 LICENSE="GPL-3+"
 SLOT="0"
-IUSE="debug llvm test"
+IUSE="llvm test"
 RESTRICT="test"         # Some tests fail.
 
 RDEPEND="
@@ -61,7 +61,10 @@ BDEPEND="
 	)
 "
 
-PATCHES=( "${FILESDIR}/nvc-1.9.2-jit-code-capstone.patch" )
+PATCHES=(
+	"${FILESDIR}/nvc-1.9.2-jit-code-capstone.patch"
+	"${FILESDIR}/nvc-1.21.1-fpurge.patch"
+)
 
 # Special libraries for NVC.
 QA_FLAGS_IGNORED="usr/lib[0-9]*/nvc/preload[0-9]*.so"
@@ -93,7 +96,6 @@ src_configure() {
 	local -a myconf=(
 		--enable-vital
 		--with-bash-completion="$(get_bashcompdir)"
-		$(use_enable debug)
 		$(use_enable llvm)
 	)
 	econf "${myconf[@]}"