commit 574290ab8473c1f941ef2e66ec4c8767bf4904fa
Author: Mihai Moldovan <ionic@ionic.de>
Date:   Thu Oct 5 00:36:32 2017 +0200

    dev-lisp/sbcl-1.4.0: pass down CFLAGS and LDFLAGS in a saner way, respecting default values.
    
    Since sbcl uses no-pie builds by default, we should let the build system
    handle the complexity and only append our {C,LD}FLAGS values. Just
    overriding them unconditionally in all places will create a big mess.
    
    Additionally, make sure that the *FLAGS variables are clean before
    changing the Makefile. The -s linker flag has proven to be unusable,
    since sbcl relies on having symbols available.

diff --git a/dev-lisp/sbcl/sbcl-1.4.0.ebuild b/dev-lisp/sbcl/sbcl-1.4.0.ebuild
index 9f565e6..962d6c3 100644
--- a/dev-lisp/sbcl/sbcl-1.4.0.ebuild
+++ b/dev-lisp/sbcl/sbcl-1.4.0.ebuild
@@ -107,11 +107,19 @@ src_prepare() {
 
 	eapply_user
 
-	# bugs #526194, #620532
-	sed -e "s@CFLAGS +=.*\$@CFLAGS = ${CFLAGS} -Wall -Wsign-compare -Wpointer-arith@" \
-		-e "s@LINKFLAGS += -g\$@LINKFLAGS = ${LDFLAGS}@" \
-		-e "s@LINKFLAGS += -no-pie\$@LINKFLAGS = ${LDFLAGS} -no-pie@" \
-		-e "s@LINKFLAGS += -nopie\$@LINKFLAGS = ${LDFLAGS} -nopie@" \
+	# Make sure the *FLAGS variables are sane.
+	# sbcl needs symbols in resulting binaries, so building with the -s linker flag will fail.
+	strip-unsupported-flags
+	filter-flags -fomit-frame-pointer -Wl,-s
+	filter-ldflags -s
+
+	# original bugs #526194, #620532
+	# this broke no-pie default builds, c.f. bug #632670
+	# Pass CFLAGS down by appending our value, to let users override
+	# the default values.
+	# Keep passing LDFLAGS down via the LINKFLAGS variable.
+	sed -e "s@\(CFLAGS += -g .*\)\$@\1 ${CFLAGS}@" \
+		-e "s@LINKFLAGS += -g\$@LINKFLAGS += ${LDFLAGS}@" \
 		-i src/runtime/GNUmakefile || die
 
 	sed -e "s@SBCL_PREFIX=\"/usr/local\"@SBCL_PREFIX=\"${EPREFIX}/usr\"@" \
@@ -148,8 +156,6 @@ src_configure() {
 src_compile() {
 	local bindir="${WORKDIR}"/sbcl-binary
 
-	strip-unsupported-flags ; filter-flags -fomit-frame-pointer
-
 	if use pax_kernel ; then
 		# To disable PaX on hardened systems
 		pax-mark -mr "${bindir}"/src/runtime/sbcl