[build] Be explicit about -fcommon compiler directive

gcc10 switched default behavior from -fcommon to -fno-common.  Since
"__shared" relies on the legacy behavior, explicitly specify it.

Signed-off-by: Bruce Rogers <brogers@suse.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index 66d6dd449d03d0f8c3095653ffc306dfb9e69078..b6c61c11249c4c4922e065997399249be8fc5943 100644 (file)
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -418,6 +418,7 @@ CFLAGS              += -Os
 CFLAGS         += -g
 ifeq ($(CCTYPE),gcc)
 CFLAGS         += -ffreestanding
+CFLAGS         += -fcommon
 CFLAGS         += -Wall -W -Wformat-nonliteral
 HOST_CFLAGS    += -Wall -W -Wformat-nonliteral
 endif