Bug: https://bugs.gentoo.org/758167
Full PR is at https://github.com/gentoo/gentoo/pull/32730

Several LLVM packages require this early return, otherwise they fail to build on Darwin. I'll also need this USE-flag for sys-devel/clang-common, to distinguish between stage2 and stage3 of bootstrap-prefix.sh to configure clang differently.

--
Best regards,
Alexey "DarthGandalf" Sokolov
From de2bd1abc3e5c7607413633d132c604c6a801802 Mon Sep 17 00:00:00 2001
From: Alexey Sokolov <alexey+gen...@asokolov.org>
Date: Mon, 11 Sep 2023 23:26:49 +0100
Subject: [PATCH] llvm.eclass: add global USE flag bootstrap-prefix

Mask it everywhere except for prefix profiles

Without this, stage2's LLVM packages fail to build.

Bug: https://bugs.gentoo.org/758167
Signed-off-by: Alexey Sokolov <alexey+gen...@asokolov.org>
---
 eclass/llvm.eclass                | 7 +++++++
 profiles/base/use.mask            | 4 ++++
 profiles/features/prefix/use.mask | 4 ++++
 profiles/use.desc                 | 1 +
 4 files changed, 16 insertions(+)

diff --git a/eclass/llvm.eclass b/eclass/llvm.eclass
index 8198650aad9a7..87c2cedb3a376 100644
--- a/eclass/llvm.eclass
+++ b/eclass/llvm.eclass
@@ -64,6 +64,8 @@ esac
 if [[ ! ${_LLVM_ECLASS} ]]; then
 _LLVM_ECLASS=1
 
+IUSE="bootstrap-prefix"
+
 # make sure that the versions installing straight into /usr/bin
 # are uninstalled
 DEPEND="!!sys-devel/llvm:0"
@@ -242,6 +244,11 @@ llvm_fix_tool_path() {
 llvm_pkg_setup() {
 	debug-print-function ${FUNCNAME} "${@}"
 
+	if use bootstrap-prefix; then
+		# AppleClang has unparseable version numbers, but it's irrelevant anyway
+		return
+	fi
+
 	if [[ ${MERGE_TYPE} != binary ]]; then
 		LLVM_SLOT=$(get_llvm_slot "${LLVM_MAX_SLOT}")
 
diff --git a/profiles/base/use.mask b/profiles/base/use.mask
index 1d4f5b92865df..cc86fde21097a 100644
--- a/profiles/base/use.mask
+++ b/profiles/base/use.mask
@@ -8,6 +8,10 @@
 # eudev is masked for removal
 eudev
 
+# Alexey Sokolov <alexey+gen...@asokolov.org> (2023-09-11)
+# Only needed during bootstrap of prefix
+bootstrap-prefix
+
 # David Seifert <s...@gentoo.org> (2023-09-09)
 # EOL upstream in 2 months, causes major headaches for OpenSSL 1.1
 # masking. Removal on 2023-10-09.
diff --git a/profiles/features/prefix/use.mask b/profiles/features/prefix/use.mask
index 482ce57f04485..1f43ca23fd101 100644
--- a/profiles/features/prefix/use.mask
+++ b/profiles/features/prefix/use.mask
@@ -4,6 +4,10 @@
 # prefix USE flag should always be unmasked in prefix profiles
 -prefix
 
+# Alexey Sokolov <alexey+gen...@asokolov.org> (2023-09-11)
+# Allow bootstrapping the prefix
+-bootstrap-prefix
+
 # USE flags inherited by the base/use.defaults file that shouldn't be in Prefix
 gpm
 
diff --git a/profiles/use.desc b/profiles/use.desc
index 6034f3bf6fc31..37c64f43759da 100644
--- a/profiles/use.desc
+++ b/profiles/use.desc
@@ -29,6 +29,7 @@ big-endian - Big-endian toolchain support
 bindist - Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues)
 blas - Add support for the virtual/blas numerical library
 bluetooth - Enable Bluetooth Support
+bootstrap-prefix - !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for bootstrapping Gentoo Prefix
 branding - Enable Gentoo specific branding
 build - !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping [make stage1]
 bzip2 - Use the bzlib compression library

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