From dd115a7e6981c0e7d3f88208a4a6b4e9d93cd069 Mon Sep 17 00:00:00 2001
From: Tom Stellard <tom@stellard.net>
Date: Sun, 6 Jun 2021 10:11:13 -0700
Subject: [PATCH] cmake: Compile with -fcommon

Newer versions of gcc and clang default to fno-common and
our global variable usage requires -fcommon.
---
 CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a0605b88..bbc13ab7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -140,7 +140,11 @@ add_executable(bygfoot WIN32
 )
 # Some gtk headers use deprecated glib features, so disable this warning
 # since we can't do anything about it.
-target_compile_options(bygfoot PRIVATE -Wno-deprecated-declarations)
+# Newer versions of gcc and clang enable fno-common by default and
+# this won't work with the global variables in bygfoot.
+target_compile_options(bygfoot PRIVATE
+	               -Wno-deprecated-declarations
+		       -fcommon)
 # Link the target to the GTK+ libraries
 target_link_libraries (bygfoot ${GTK2_LIBRARIES} ${GLIB_LIBRARIES} m
                                ${ZLIB_LIBRARIES} ${JSON-C_LIBRARIES})