build: Work around -Wundef with older GLib

This previous PR caused our `-Werror=undef` to trigger when building
with older GLib; this should work around it.

Closes: #1327
Approved by: jlebon

diff --git a/Makefile.am b/Makefile.am
index 2a33282f2437ad837c5afeb916603e89de2f5d2a..e1dfd32be737fc02df065381fb5938837dc5aa81 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -29,7 +29,7 @@ AM_CPPFLAGS += -DDATADIR='"$(datadir)"' -DLIBEXECDIR='"$(libexecdir)"' \
        -DOSTREE_COMPILATION \
        -DG_LOG_DOMAIN=\"OSTree\" \
   -DOSTREE_GITREV='"$(OSTREE_GITREV)"' \
-       -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_40 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_50 \
+       -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_40 '-DGLIB_VERSION_MAX_ALLOWED=G_ENCODE_VERSION(2,50)' \
        -DSOUP_VERSION_MIN_REQUIRED=SOUP_VERSION_2_40 -DSOUP_VERSION_MAX_ALLOWED=SOUP_VERSION_2_48
 AM_CFLAGS += -std=gnu99 $(WARN_CFLAGS)
 AM_DISTCHECK_CONFIGURE_FLAGS += \