From cdae8d0559d41f9464ab54e2967e23a0ee06a358 Mon Sep 17 00:00:00 2001
From: Marc Poulhiès <dkm@kataplop.net>
Date: Tue, 13 Dec 2022 21:16:22 +0100
Subject: Enable support for building libgccjit
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libgccjit is still under development and, despite its name, may also be used for
ahead-of-time compilation.

Documentation can be found on the gcc website:
https://gcc.gnu.org/onlinedocs/jit/internals/index.html
https://gcc.gnu.org/wiki/JIT

With this change it's possible to enable the building of the libgccjit. It's
enabled as a language (with --enable-languages=jit) even if not a language
frontend at all.

The main changes are related to the requirement of having everything host side
built as Position Independent Code (PIC) with --enable-host-shared. GCC has the
needed logic for building its dependencies (mpc, gmp, mpfr, ...) correctly when
built "in-tree", which is not the case with crosstool-ng (see
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=05048fc29f0)

Signed-off-by: Marc Poulhiès <dkm@kataplop.net>
---
 config/cc.in     | 14 ++++++++++++++
 config/cc/gcc.in |  1 +
 2 files changed, 15 insertions(+)

(limited to 'config')

diff --git a/config/cc.in b/config/cc.in
index 922bfeea..068d445a 100644
--- a/config/cc.in
+++ b/config/cc.in
@@ -20,6 +20,9 @@ config CC_SUPPORT_ADA
 config CC_SUPPORT_D
     bool
 
+config CC_SUPPORT_JIT
+    bool
+
 config CC_SUPPORT_OBJC
     bool
 
@@ -53,6 +56,17 @@ config CC_LANG_FORTRAN
       Only select this if you know that your specific version of the
       compiler supports this language.
 
+config CC_LANG_JIT
+    bool
+    prompt "JIT (EXPERIMENTAL)"
+    depends on CC_SUPPORT_JIT
+    depends on EXPERIMENTAL
+    help
+      Enable building the GCC JIT library.
+
+      Only select this if you know that your specific version of the
+      compiler supports the libgccjit.
+
 if ! BARE_METAL
 
 config CC_LANG_JAVA
diff --git a/config/cc/gcc.in b/config/cc/gcc.in
index e77b0716..d5b19c79 100644
--- a/config/cc/gcc.in
+++ b/config/cc/gcc.in
@@ -5,6 +5,7 @@
 ## select CC_SUPPORT_JAVA if !GCC_7_or_later && OBSOLETE
 ## select CC_SUPPORT_ADA
 ## select CC_SUPPORT_D
+## select CC_SUPPORT_JIT
 ## select CC_SUPPORT_OBJC
 ## select CC_SUPPORT_OBJCXX
 ## select CC_SUPPORT_GOLANG
-- 
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