From e485a16a8dc306a522ecb84ae9d8ceae19fe6b5d Mon Sep 17 00:00:00 2001
From: SupervisedThinking <supervisedthinking@gmail.com>
Date: Thu, 6 Oct 2022 19:39:35 +0200
Subject: [PATCH] build system: add support for mold & linker PKG_BUILD_FLAGS

---
 config/functions                | 2 +-
 config/optimize                 | 1 +
 config/show_config              | 1 +
 distributions/LibreELEC/options | 5 ++++-
 packages/readme.md              | 1 +
 5 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/config/functions b/config/functions
index e1216a3e88..7fd8972f1c 100644
--- a/config/functions
+++ b/config/functions
@@ -270,7 +270,7 @@ linker_allowed() {
 get_target_linker() {
   # all known linkers, in descending order of priority
   # those are candidates for explicit opt-in via PKG_BUILD_FLAGS
-  local all_linkers="gold bfd"
+  local all_linkers="mold gold bfd"
 
   # linkers to choose from unless disabled via PKG_BUILD_FLAGS
   local linker_candidates="${DEFAULT_LINKER:-bfd} ${all_linkers}"
diff --git a/config/optimize b/config/optimize
index 14eb946aca..843d399388 100644
--- a/config/optimize
+++ b/config/optimize
@@ -31,6 +31,7 @@ LDFLAGS_OPTIM_LTO_COMMON="-fuse-linker-plugin"
 LDFLAGS_OPTIM_LINKER_COMPILER_DEFAULT=""
 LDFLAGS_OPTIM_LINKER_BFD="-fuse-ld=bfd"
 LDFLAGS_OPTIM_LINKER_GOLD="-fuse-ld=gold"
+LDFLAGS_OPTIM_LINKER_MOLD="-fuse-ld=mold"
 
 # default compiler optimization
 CFLAGS_OPTIM_DEFAULT="-O2 -fomit-frame-pointer -DNDEBUG"
diff --git a/config/show_config b/config/show_config
index 7b7628465b..82029ff957 100644
--- a/config/show_config
+++ b/config/show_config
@@ -31,6 +31,7 @@ show_config() {
   config_message+="\n - CPU features:\t\t\t ${TARGET_FEATURES}"
   config_message+="\n - LTO (Link Time Optimization) support: ${LTO_SUPPORT}"
   config_message+="\n - GOLD (Google Linker) Support:\t ${GOLD_SUPPORT}"
+  config_message+="\n - MOLD (Modern Linker) Support:\t ${MOLD_SUPPORT}"
   config_message+="\n - Default Linker:\t\t\t ${DEFAULT_LINKER}"
   config_message+="\n - LLVM support:\t\t\t ${LLVM_SUPPORT}"
   config_message+="\n - DEBUG:\t\t\t\t ${DEBUG:-no}"
diff --git a/distributions/LibreELEC/options b/distributions/LibreELEC/options
index ccbd590a48..67402796fc 100644
--- a/distributions/LibreELEC/options
+++ b/distributions/LibreELEC/options
@@ -32,7 +32,10 @@
 # GOLD (Google Linker) support
   GOLD_SUPPORT="yes"
 
-# default linker (bfd / gold)
+# MOLD (Modern Linker) support
+  MOLD_SUPPORT="no"
+
+# default linker (bfd / gold / mold)
   DEFAULT_LINKER="gold"
 
 # HARDENING (security relevant linker and compiler flags) support
diff --git a/packages/readme.md b/packages/readme.md
index c284c5f005..7c4f4984bc 100644
--- a/packages/readme.md
+++ b/packages/readme.md
@@ -128,6 +128,7 @@ Set the variable `PKG_BUILD_FLAGS` in the `package.mk` to enable/disable the sin
 | lto-off  | disabled | target, init      | explicitly disable LTO in the compiler and linker |
 | bfd      | - | target, init | `+bfd` prefers bfd linker over default linker, `-bfd` disables using bfd |
 | gold     | - | target, init | `+gold` prefers gold linker over default linker, `-gold` disables using gold |
+| mold     | - | target, init | `+mold` prefers mold linker over default linker, `-mold` disables using gold |
 | parallel | enabled  | all | `make` or `ninja` builds with multiple threads/processes (or not) |
 | strip    | enabled  | target | strips executables (or not) |
 | sysroot  | enabled  | target | installs the package to the sysroot folder (or not) |