sys-devel/gcc: add support for USE=jit #568834

2 files changed, 12 insertions, 0 deletions

diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index 43fa8bffc970..b18d41816eb5 100644
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -152,6 +152,7 @@ if [[ ${PN} != "kgcc64" && ${PN} != gcc-* ]] ; then
 	# the older versions, we don't want to bother supporting it.  #448024
 	tc_version_is_at_least 4.8 && IUSE+=" graphite" IUSE_DEF+=( sanitize )
 	tc_version_is_at_least 4.9 && IUSE+=" cilk"
+	tc_version_is_at_least 5.0 && IUSE+=" jit"
 	tc_version_is_at_least 6.0 && IUSE+=" pie +ssp"
 fi
 
@@ -841,6 +842,7 @@ toolchain_src_configure() {
 	is_d   && GCC_LANG+=",d"
 	is_gcj && GCC_LANG+=",java"
 	is_go  && GCC_LANG+=",go"
+	is_jit && GCC_LANG+=",jit"
 	if is_objc || is_objcxx ; then
 		GCC_LANG+=",objc"
 		if tc_version_is_at_least 4 ; then
@@ -904,6 +906,9 @@ toolchain_src_configure() {
 		confgcc+=( --enable-libstdcxx-time )
 	fi
 
+	# The jit language requires this.
+	is_jit && confgcc+=( --enable-host-shared )
+
 	# # Turn on the -Wl,--build-id flag by default for ELF targets. #525942
 	# # This helps with locating debug files.
 	# case ${CTARGET} in
@@ -2155,6 +2160,11 @@ is_go() {
 	use cxx && use_if_iuse go
 }
 
+is_jit() {
+	gcc-lang-supported jit || return 1
+	use_if_iuse jit
+}
+
 is_multilib() {
 	tc_version_is_at_least 3 || return 1
 	use multilib
diff --git a/sys-devel/gcc/metadata.xml b/sys-devel/gcc/metadata.xml
index 29330fe59252..2e74979dae7b 100644
--- a/sys-devel/gcc/metadata.xml
+++ b/sys-devel/gcc/metadata.xml
@@ -12,6 +12,8 @@
     <flag name="go">Build the GCC Go language frontend.</flag>
     <flag name="graphite">Add support for the framework for loop
       optimizations based on a polyhedral intermediate representation</flag>
+    <flag name="jit">Enable libgccjit so other applications can embed gcc for Just-In-Time compilation.
+      This will slow down the compiler a bit as it forces all of the toolchain to be shared libs.</flag>
     <flag name="libssp">Build SSP support into a dedicated library rather than use the
       code in the C library (DO NOT ENABLE THIS IF YOU DON'T KNOW WHAT IT DOES)</flag>
     <flag name="mudflap">Add support for mudflap, a pointer use checking library</flag>