From 0477944e71d837e76cbea86943d7ad8d2e4b5dc0 Mon Sep 17 00:00:00 2001
From: Michael Cho <michael@michaelcho.dev>
Date: Sat, 3 Aug 2024 14:26:55 -0400
Subject: [PATCH] shims/super/cc: pass `-ld_classic` if needed for
 `-dead_strip_dylibs`

---
 Library/Homebrew/extend/ENV/super.rb               | 4 +++-
 Library/Homebrew/extend/os/mac/extend/ENV/super.rb | 4 ++++
 Library/Homebrew/shims/super/cc                    | 6 ++++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/extend/ENV/super.rb b/Library/Homebrew/extend/ENV/super.rb
index b3629b790b..7a3677bd88 100644
--- a/Library/Homebrew/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/ENV/super.rb
@@ -104,11 +104,13 @@ module Superenv
     # K - Don't strip -arch <arch>, -m32, or -m64
     # d - Don't strip -march=<target>. Use only in formulae that
     #     have runtime detection of CPU features.
-    # w - Pass -no_weak_imports to the linker
     # D - Generate debugging information
+    # w - Pass `-no_weak_imports` to the linker
     # f - Pass `-no_fixup_chains` to `ld` whenever it
     #     is invoked with `-undefined dynamic_lookup`
     # o - Pass `-oso_prefix` to `ld` whenever it is invoked
+    # c - Pass `-ld_classic` to `ld` whenever it is invoked
+    #     with `-dead_strip_dylibs`
     #
     # These flags will also be present:
     # a - apply fix for apr-1-config path
diff --git a/Library/Homebrew/extend/os/mac/extend/ENV/super.rb b/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
index 56a7f06ec1..c18a8e95c2 100644
--- a/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
+++ b/Library/Homebrew/extend/os/mac/extend/ENV/super.rb
@@ -143,6 +143,10 @@ module Superenv
 
     # Strip build prefixes from linker where supported, for deterministic builds.
     append_to_cccfg "o" if DevelopmentTools.ld64_version >= 512
+
+    # Pass `-ld_classic` whenever the linker is invoked with `-dead_strip_dylibs`
+    # on `ld` versions that don't properly handle that option.
+    append_to_cccfg "c" if DevelopmentTools.ld64_version >= "1015.7" && DevelopmentTools.ld64_version <= "1022.1"
   end
 
   def no_weak_imports
diff --git a/Library/Homebrew/shims/super/cc b/Library/Homebrew/shims/super/cc
index 47761798c3..854e6cc065 100755
--- a/Library/Homebrew/shims/super/cc
+++ b/Library/Homebrew/shims/super/cc
@@ -324,11 +324,13 @@ class Cmd
       args << "-no_weak_imports" if no_weak_imports?
       args << "-no_fixup_chains" if no_fixup_chains?
       args << "-oso_prefix" << formula_buildpath if oso_prefix? && formula_buildpath
+      args << "-ld_classic" if ld_classic?
     when :ccld, :cxxld
       args << "-Wl,-headerpad_max_install_names"
       args << "-Wl,-no_weak_imports" if no_weak_imports?
       args << "-Wl,-no_fixup_chains" if no_fixup_chains?
       args << "-Wl,-oso_prefix,#{formula_buildpath}" if oso_prefix? && formula_buildpath
+      args << "-Wl,-ld_classic" if ld_classic?
     end
     args
   end
@@ -441,6 +443,10 @@ class Cmd
     config.include?("o") && !configure?
   end
 
+  def ld_classic?
+    config.include?("c") && calls_ld? && @args.any? { |arg| arg.match?(/^(-Wl,)?-dead_strip_dylibs$/) }
+  end
+
   def calls_ld?
     return true if mode == :ld
     return false unless [:ccld, :cxxld].include?(mode)