2 files changed, 8 insertions, 2 deletions
diff --git a/cppawk b/cppawk
index bf9ad2d..d6b29d4 100755
--- a/cppawk
+++ b/cppawk
@@ -31,8 +31,9 @@
 prepro=cpp
 incopt=-iquote # GNU extension: must be changed to -I for traditional cpp
 dumpopt=-dM # GNU cpp option to dump macros
+stdopt=-std=c99 # GNU cpp option for standard conformance
 awk=gawk
-prepro_opts="-D__gawk__=1 -D__cppawk_ver=20220324"
+prepro_opts="-D__gawk__=1 -D__cppawk_ver=20220324 $stdopt"
 
 # globals
 bash=${BASH_VERSION+y}
diff --git a/testcases b/testcases
index 6e256ce..06a399c 100644
--- a/testcases
+++ b/testcases
@@ -187,7 +187,7 @@ yes
 33:
 $cppawk --prepro-only --prepro=./testdir/testcpp abc
 :
-[-iq][-D_][-D_][-I.][-]
+[-iq][-D_][-D_][-st][-I.][-]
 --
 34:
 $cppawk --prepro-only --awk=mawk mawk=__mawk__ | grep mawk
@@ -245,3 +245,8 @@ testdir/name.cwk
 $cppawk --dump-macros '#define foo_bar 42' | grep foo_bar
 :
 #define foo_bar 42
+--
+43:
+$cppawk --dump-macros x | (grep -q '#define [A-Za-z]' || echo "clean")
+:
+clean