test - compile QF with extra include dir

Makefile

@@ -572,7 +572,7 @@ $(OBJDIR)/%.o : $(CURDIR)/%.sycl.cpp | $$(@D)/.DIR
 	$(call quiet,SYCLCXX) $(SYCLFLAGS) $(CPPFLAGS) -c -o $@ $(abspath $<)
 
 $(OBJDIR)/%$(EXE_SUFFIX) : tests/%.c | $$(@D)/.DIR
-	$(call quiet,LINK.c) $(CEED_LDFLAGS) -o $@ $(abspath $<) $(CEED_LIBS) $(CEED_LDLIBS) $(LDLIBS)
+	$(call quiet,LINK.c) $(CEED_LDFLAGS) -o $@ $(abspath $<) $(CEED_LIBS) $(CEED_LDLIBS) $(LDLIBS) -I./tests/test-include
 
 $(OBJDIR)/%$(EXE_SUFFIX) : tests/%.f90 | $$(@D)/.DIR
 	$(call quiet,LINK.F) -DSOURCE_DIR='"$(abspath $(<D))/"' $(CEED_LDFLAGS) -o $@ $(abspath $<) $(CEED_LIBS) $(CEED_LDLIBS) $(LDLIBS)

tests/t406-qfunction-helper.h

@@ -15,6 +15,9 @@
 // Test include path with "/./"
 #include "./t406-qfunction-scales.h"
 
-CEED_QFUNCTION_HELPER CeedScalar times_two(CeedScalar x) { return SCALE_TWO * x; }
+// Test include via -I....
+#include <fake-sys-include.h>
 
-CEED_QFUNCTION_HELPER CeedScalar times_three(CeedScalar x) { return SCALE_THREE * x; }
+CEED_QFUNCTION_HELPER CeedScalar times_two(CeedScalar x) { return FAKE_SYS_SCALE_ONE * SCALE_TWO * x; }
+
+CEED_QFUNCTION_HELPER CeedScalar times_three(CeedScalar x) { return FAKE_SYS_SCALE_ONE * SCALE_THREE * x; }

tests/t406-qfunction.c

@@ -18,6 +18,13 @@ int main(int argc, char **argv) {
   CeedScalar    v_true[q];
 
   CeedInit(argv[1], &ceed);
+  {
+    char  file_path[2056] = __FILE__;
+    char *last_slash      = strrchr(file_path, '/');
+
+    memcpy(&file_path[last_slash - file_path], "/test-include/", 15);
+    CeedAddJitSourceRoot(ceed, file_path);
+  }
 
   CeedVectorCreate(ceed, q, &w);
   CeedVectorCreate(ceed, q, &u);

tests/test-include/fake-sys-include.h

@@ -0,0 +1 @@
+#define FAKE_SYS_SCALE_ONE 1