From 64e9c11daa740ca00f82b8d8161ba4a53b4bed9f Mon Sep 17 00:00:00 2001
From: mintsuki <mintsuki@protonmail.com>
Date: Wed, 20 Apr 2022 04:38:58 +0200
Subject: [PATCH] build: No longer hard depend on GNU binutils

---
 README.md                  |  4 +++-
 common/linker_uefi64.ld.in |  4 ++++
 configure.ac               | 30 +++++++++++++++++++++++-------
 3 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/README.md b/README.md
index ad33cf77..631853b5 100644
--- a/README.md
+++ b/README.md
@@ -88,7 +88,7 @@ In order to build Limine, the following programs have to be installed:
 (optional, necessary to build `limine-cd-efi.bin`).
 Furthermore, either the toolchain must have been built in the previous
 paragraph, or `gcc` or `llvm/clang` must also be installed, alongside
-`GNU binutils`. `nasm` is optional if the toolchain was built in the previous
+the respective binutils. `nasm` is optional if the toolchain was built in the previous
 paragraph as it is built as part of it.
 
 ### Configure
@@ -101,6 +101,8 @@ If checking out from the repository, run `./autogen.sh` first (`GNU autoconf` an
 Both `./autogen.sh` and `./configure` take arguments and environment variables;
 for more information on these, run `./configure --help`.
 
+To build using the LLVM toolchain, pass `TOOLCHAIN=llvm` to `./configure`.
+
 Limine supports both in-tree and out-of-tree builds. Simply run the `configure`
 script from the directory you wish to execute the build in. The following `make`
 commands are supposed to be ran inside the build directory.
diff --git a/common/linker_uefi64.ld.in b/common/linker_uefi64.ld.in
index 8a1eabf7..36a6d5c3 100644
--- a/common/linker_uefi64.ld.in
+++ b/common/linker_uefi64.ld.in
@@ -89,6 +89,10 @@ SECTIONS
         *(.shstrtab)
     } :null
 
+    /DISCARD/ : {
+        *.32.o(.debug*)
+    }
+
     .debug_aranges 0 : {
         *(.debug_aranges)
     } :null
diff --git a/configure.ac b/configure.ac
index a44eb04a..949ecc33 100644
--- a/configure.ac
+++ b/configure.ac
@@ -160,7 +160,11 @@ if ! test "x$LIMINE_CC" = "x"; then
         AC_MSG_ERROR([LIMINE_CC ($LIMINE_CC) not found])
     fi
 else
-    LIMINE_CC="$TOOLCHAIN-gcc"
+    if test "$TOOLCHAIN" = 'llvm'; then
+        LIMINE_CC='clang'
+    else
+        LIMINE_CC="$TOOLCHAIN-gcc"
+    fi
     AC_CHECK_PROG([LIMINE_CC_1], [$LIMINE_CC], [yes])
     if ! test "x$LIMINE_CC_1" = "xyes"; then
         LIMINE_CC="$CC"
@@ -199,20 +203,32 @@ AC_DEFUN([GET_BINUTILS_PROG], [
 
     if ! test "x$LIMINE_$1" = "x"; then
         AC_CHECK_PROG([LIMINE_$1_0], [$LIMINE_$1], [yes])
-        if ! test "x$LIMINE_$1_0" = "xyes" || ! $LIMINE_$1 --version | $GREP 'Free Software Foundation' >/dev/null 2>&1; then
+        if ! test "x$LIMINE_$1_0" = "xyes"; then
             AC_MSG_ERROR([LIMINE_$1 ($LIMINE_$1) is not a suitable $3])
         fi
     else
-        LIMINE_$1="$TOOLCHAIN-$2"
+        if test "$TOOLCHAIN" = 'llvm' && test '$2' = 'ld'; then
+            LIMINE_$1='ld.lld'
+        else
+            LIMINE_$1="$TOOLCHAIN-$2"
+        fi
         AC_CHECK_PROG([LIMINE_$1_1], [$LIMINE_$1], [yes])
-        if ! test "x$LIMINE_$1_1" = "xyes" || ! $LIMINE_$1 --version | $GREP 'Free Software Foundation' >/dev/null 2>&1; then
+        if ! test "x$LIMINE_$1_1" = "xyes"; then
             LIMINE_$1='g$2'
             AC_CHECK_PROG([LIMINE_$1_2], [$LIMINE_$1], [yes])
-            if ! test "x$LIMINE_$1_2" = "xyes" || ! $LIMINE_$1 --version | $GREP 'Free Software Foundation' >/dev/null 2>&1; then
+            if ! test "x$LIMINE_$1_2" = "xyes"; then
                 LIMINE_$1='$2'
                 AC_CHECK_PROG([LIMINE_$1_3], [$LIMINE_$1], [yes])
-                if ! test "x$LIMINE_$1_3" = "xyes" || ! $LIMINE_$1 --version | $GREP 'Free Software Foundation' >/dev/null 2>&1; then
-                    AC_MSG_ERROR([no suitable LIMINE_$1 found, run $srcdir/make_toolchain.sh or install GNU binutils])
+                if ! test "x$LIMINE_$1_3" = "xyes"; then
+                    if test '$2' = 'ld'; then
+                        LIMINE_$1='ld.lld'
+                    else
+                        LIMINE_$1='llvm-$2'
+                    fi
+                    AC_CHECK_PROG([LIMINE_$1_4], [$LIMINE_$1], [yes])
+                    if ! test "x$LIMINE_$1_4" = "xyes"; then
+                        AC_MSG_ERROR([no suitable LIMINE_$1 found, run $srcdir/make_toolchain.sh or install LLVM/GNU binutils])
+                    fi
                 fi
             fi
         fi