makefile: avoid preprocessor definition usage when linking

lib/Makefile.am

@@ -124,7 +124,7 @@ libcurl_la_LDFLAGS = $(LINKFLAGS) $(VERSIONINFO)
 # do it if debug is enabled
 if CURLDEBUG
 noinst_LTLIBRARIES = libcurlu.la
-libcurlu_la_CFLAGS = -DUNITTESTS
+libcurlu_la_CPPFLAGS = $(AM_CPPFLAGS) -DUNITTESTS
 libcurlu_la_LDFLAGS = -static $(LINKFLAGS)
 endif
 

tests/libtest/Makefile.inc

@@ -71,19 +71,19 @@ lib524_SOURCES = lib524.c $(SUPPORTFILES)
 lib525_SOURCES = lib525.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 
 lib526_SOURCES = lib526.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
-lib526_CFLAGS = -DLIB526
+lib526_CPPFLAGS = $(AM_CPPFLAGS) -DLIB526
 
 lib527_SOURCES = lib526.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
-lib527_CFLAGS = -DLIB527
+lib527_CPPFLAGS = $(AM_CPPFLAGS) -DLIB527
 
 lib529_SOURCES = lib525.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
-lib529_CFLAGS = -DLIB529
+lib529_CPPFLAGS = $(AM_CPPFLAGS) -DLIB529
 
 lib530_SOURCES = lib530.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
-lib530_CFLAGS = -DLIB530
+lib530_CPPFLAGS = $(AM_CPPFLAGS) -DLIB530
 
 lib532_SOURCES = lib526.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
-lib532_CFLAGS = -DLIB532
+lib532_CPPFLAGS = $(AM_CPPFLAGS) -DLIB532
 
 lib533_SOURCES = lib533.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 
@@ -104,12 +104,12 @@ lib543_SOURCES = lib543.c $(SUPPORTFILES)
 lib544_SOURCES = lib544.c $(SUPPORTFILES)
 
 lib545_SOURCES = lib544.c $(SUPPORTFILES)
-lib545_CFLAGS = -DLIB545
+lib545_CPPFLAGS = $(AM_CPPFLAGS) -DLIB545
 
 lib547_SOURCES = lib547.c $(SUPPORTFILES)
 
 lib548_SOURCES = lib547.c $(SUPPORTFILES)
-lib548_CFLAGS = -DLIB548
+lib548_CPPFLAGS = $(AM_CPPFLAGS) -DLIB548
 
 lib549_SOURCES = lib549.c $(SUPPORTFILES)
 
@@ -138,7 +138,7 @@ lib562_SOURCES = lib562.c $(SUPPORTFILES)
 lib564_SOURCES = lib564.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 
 lib565_SOURCES = lib510.c $(SUPPORTFILES)
-lib565_CFLAGS = -DLIB565
+lib565_CPPFLAGS = $(AM_CPPFLAGS) -DLIB565
 
 lib566_SOURCES = lib566.c $(SUPPORTFILES)
 
@@ -165,4 +165,4 @@ lib582_SOURCES = lib582.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib583_SOURCES = lib583.c $(SUPPORTFILES)
 
 lib585_SOURCES = lib500.c $(SUPPORTFILES)
-lib585_CFLAGS = -DLIB585
+lib585_CPPFLAGS = $(AM_CPPFLAGS) -DLIB585

tests/unit/Makefile.am

@@ -58,7 +58,7 @@ EXTRA_DIST = Makefile.inc
 
 LDADD = $(top_builddir)/lib/libcurlu.la @CURL_LIBS@
 DEPENDENCIES = $(top_builddir)/lib/libcurlu.la
-CFLAGS += -DUNITTESTS
+AM_CPPFLAGS = -DUNITTESTS
 
 # Makefile.inc provides the source defines (TESTUTIL, SUPPORTFILES,
 # noinst_PROGRAMS, lib*_SOURCES, and lib*_CFLAGS)