*/*: Added LTO use flag, respecting environment

Closes: https://bugs.gentoo.org/887427
Closes: https://bugs.gentoo.org/887429
Signed-off-by: Denis Reva <denis7774@gmail.com>

dev-lang/quickjs/files/quickjs-2021-03-27-respect-env.patch

@@ -0,0 +1,47 @@
+diff --git a/Makefile b/Makefile
+index 8fc7e55..03cec93 100644
+--- a/Makefile
++++ b/Makefile
+@@ -28,7 +28,7 @@ endif
+ # Windows cross compilation from Linux
+ #CONFIG_WIN32=y
+ # use link time optimization (smaller and faster executables but slower build)
+-CONFIG_LTO=y
++#CONFIG_LTO=y
+ # consider warnings as errors (for development)
+ #CONFIG_WERROR=y
+ # force 32 bit build for some utilities
+@@ -65,7 +65,7 @@ else
+ endif
+ ifdef CONFIG_CLANG
+   HOST_CC=clang
+-  CFLAGS+=-g -Wall -MMD -MF $(OBJDIR)/$(@F).d
++  CFLAGS+=-Wall -MMD -MF $(OBJDIR)/$(@F).d
+   CFLAGS += -Wextra
+   CFLAGS += -Wno-sign-compare
+   CFLAGS += -Wno-missing-field-initializers
+@@ -82,7 +82,7 @@ ifdef CONFIG_CLANG
+   endif
+ else
+   HOST_CC=gcc
+-  CFLAGS+=-g -Wall -MMD -MF $(OBJDIR)/$(@F).d
++  CFLAGS+=-Wall -MMD -MF $(OBJDIR)/$(@F).d
+   CFLAGS += -Wno-array-bounds -Wno-format-truncation
+   ifdef CONFIG_LTO
+   else
+@@ -101,11 +101,11 @@ DEFINES+=-D__USE_MINGW_ANSI_STDIO # for standard snprintf behavior
+ endif
+ 
+ CFLAGS+=$(DEFINES)
+-CFLAGS_DEBUG=$(CFLAGS) -O0
+-CFLAGS_SMALL=$(CFLAGS) -Os
+-CFLAGS_OPT=$(CFLAGS) -O2
++CFLAGS_DEBUG=$(CFLAGS)
++CFLAGS_SMALL=$(CFLAGS)
++CFLAGS_OPT=$(CFLAGS)
+ CFLAGS_NOLTO:=$(CFLAGS_OPT)
+-LDFLAGS+=-g
++#LDFLAGS+=
+ ifdef CONFIG_LTO
+ CFLAGS_SMALL+=-flto
+ CFLAGS_OPT+=-flto

dev-lang/quickjs/metadata.xml

@@ -6,4 +6,7 @@
 		<name>Denis Reva</name>
 		<description>rarogcmex</description>
 	</maintainer>
+	<use>
+		<flag name="lto">Enable Link Time Optimizations (improves performance and decreases size of executables)</flag>
+	</use>
 </pkgmetadata>

dev-lang/quickjs/quickjs-2021.03.27.ebuild

@@ -14,8 +14,12 @@ S="${WORKDIR}/${MY_P}"
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="~amd64"
+IUSE="lto"
 
-PATCHES=( "${FILESDIR}/${PN}-2020.11.08_Remove-TTY-check-in-test.patch" )
+PATCHES=(
+	"${FILESDIR}/${PN}-2020.11.08_Remove-TTY-check-in-test.patch"
+	"${FILESDIR}/${PN}-2021-03-27-respect-env.patch"
+	)
 
 src_prepare() {
 	sed -i \
@@ -34,3 +38,11 @@ src_prepare() {
 
 	default
 }
+
+src_compile() {
+	if use lto; then
+		CONFIG_LTO=$(use lto) emake
+	else
+		emake
+	fi
+}