From e9bcab6986b064a6584286f6b22fde3177b1694d Mon Sep 17 00:00:00 2001
From: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>
Date: Wed, 21 Sep 2022 22:45:19 +0800
Subject: [PATCH] extend/ENV/std: ignore `fails_with` during `brew test`.

The compiler used to a build a formula is typically not needed during
the test.

This will allow us to get rid of some `:test` dependencies, which were
added to prevent `brew` from throwing a `CompilerSelectionError` because
the formula declares `fails_with` the default compiler.

This also helps us get more accurate results from `brew linkage` in
cases of unintended linkage with the compiler used to build.

Fixes #11795.
---
 Library/Homebrew/extend/ENV/std.rb | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/extend/ENV/std.rb b/Library/Homebrew/extend/ENV/std.rb
index 37d4c7779f..0d75f43489 100644
--- a/Library/Homebrew/extend/ENV/std.rb
+++ b/Library/Homebrew/extend/ENV/std.rb
@@ -57,7 +57,14 @@ module Stdenv
     # Os is the default Apple uses for all its stuff so let's trust them
     define_cflags "-Os #{SAFE_CFLAGS_FLAGS}"
 
-    send(compiler)
+    begin
+      send(compiler)
+    rescue CompilerSelectionError => e
+      # We don't care if our compiler fails to build the formula during `brew test`.
+      raise e unless testing_formula
+
+      send(DevelopmentTools.default_compiler)
+    end
 
     return unless cc&.match?(GNU_GCC_REGEXP)