From 3f5b48b76b7f6bb4a124f8cb987316df085600fa Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@hawthorn.email>
Date: Sat, 23 Dec 2023 11:39:22 -0800
Subject: [PATCH] Use line control in merged .c file

---
 contrib/ruby/ext/trilogy-ruby/extconf.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/contrib/ruby/ext/trilogy-ruby/extconf.rb b/contrib/ruby/ext/trilogy-ruby/extconf.rb
index 05ad2aec..f618ef21 100644
--- a/contrib/ruby/ext/trilogy-ruby/extconf.rb
+++ b/contrib/ruby/ext/trilogy-ruby/extconf.rb
@@ -2,8 +2,12 @@
 
 # concatenate trilogy library sources to allow the compiler to optimise across
 # source files
+
+trilogy_src_dir = File.realpath("src", __dir__)
 File.binwrite("trilogy.c",
-  Dir["#{__dir__}/src/**/*.c"].map { |src| File.binread(src) }.join)
+  Dir["#{trilogy_src_dir}/**/*.c"].map { |src|
+    %{#line 1 "#{src}"\n} + File.binread(src)
+  }.join)
 
 $objs = %w[trilogy.o cast.o cext.o]
 $CFLAGS << " -I #{__dir__}/inc -std=gnu99 -fvisibility=hidden"