Add CFLAGS-OMIT support to glibc targets for now being the same as for uclibc targets, adapt regex

test/Test.mak

@@ -73,7 +73,7 @@ endef
 
 $(U_TARGETS):
 	$(showlink)
-	$(Q)$(CC) $(filter-out $(CFLAGS-OMIT_$@.c),$(CFLAGS)) $(EXTRA_CFLAGS) $(CFLAGS_$@) -c $@.c -o $@.o
+	$(Q)$(CC) $(filter-out $(CFLAGS-OMIT_$@),$(CFLAGS)) $(EXTRA_CFLAGS) $(CFLAGS_$@) -c $@.c -o $@.o
 	$(Q)$(CC) $(LDFLAGS) $@.o -o $@ $(EXTRA_LDFLAGS) $(LDFLAGS_$@)
 ifeq ($(COMPILE_ONLY),)
 	$(exec_test)
@@ -82,7 +82,7 @@ endif
 
 $(G_TARGETS):
 	$(showlink)
-	$(Q)$(HOSTCC) $(HOST_CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(patsubst %_glibc,%,$@)) -c $(patsubst %_glibc,%,$@).c -o $@.o
+	$(Q)$(HOSTCC) $(filter-out $(CFLAGS-OMIT_$(patsubst %_glibc,%,$@)),$(HOST_CFLAGS)) $(EXTRA_CFLAGS) $(CFLAGS_$(patsubst %_glibc,%,$@)) -c $(patsubst %_glibc,%,$@).c -o $@.o
 	$(Q)$(HOSTCC) $(HOST_LDFLAGS) $@.o -o $@ $(EXTRA_LDFLAGS) $(LDFLAGS_$(patsubst %_glibc,%,$@))
 ifeq ($(COMPILE_ONLY),)
 	$(exec_test)

test/regex/Makefile

@@ -7,13 +7,13 @@ include ../Test.mak
 
 CFLAGS_tst-regex2 := -std=c99
 
-CFLAGS-OMIT_testregex.c := -D_GNU_SOURCE
-CFLAGS-OMIT_testregexc.c := -D_GNU_SOURCE
-CFLAGS-OMIT_testregexf.c := -D_GNU_SOURCE
-CFLAGS-OMIT_testregexl.c := -D_GNU_SOURCE
-CFLAGS-OMIT_testregexn.c := -D_GNU_SOURCE
-CFLAGS-OMIT_testregexp.c := -D_GNU_SOURCE
-CFLAGS-OMIT_testregexr.c := -D_GNU_SOURCE
+CFLAGS-OMIT_testregex := -D_GNU_SOURCE
+CFLAGS-OMIT_testregexc := -D_GNU_SOURCE
+CFLAGS-OMIT_testregexf := -D_GNU_SOURCE
+CFLAGS-OMIT_testregexl := -D_GNU_SOURCE
+CFLAGS-OMIT_testregexn := -D_GNU_SOURCE
+CFLAGS-OMIT_testregexp := -D_GNU_SOURCE
+CFLAGS-OMIT_testregexr := -D_GNU_SOURCE
 
 OPTS_testregex := < basic.dat
 OPTS_testregexc := < categorize.dat