teach sparse about __STDC_HOSTED__

It seems that some system libraries expect __STDC_HOSTED__ to
be always defined.

So, teach sparse the options flags -f[no-]{hosted,freestanding}
and define __STDC_HOSTED__ accordingly.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>

4 files changed, 27 insertions, 0 deletions

diff --git a/lib.c b/lib.c
index 88bb3109..e5678826 100644
--- a/lib.c
+++ b/lib.c
@@ -311,6 +311,7 @@ int dbg_ir = 0;
 int dbg_postorder = 0;
 
 unsigned long fdump_ir;
+int fhosted = 1;
 int fmem_report = 0;
 unsigned long long fmemcpy_max_count = 100000;
 unsigned long fpasses = ~0UL;
@@ -994,6 +995,8 @@ static int handle_fmax_warnings(const char *arg, const char *opt, const struct f
 static struct flag fflags[] = {
 	{ "diagnostic-prefix",	NULL,	handle_fdiagnostic_prefix },
 	{ "dump-ir",		NULL,	handle_fdump_ir },
+	{ "freestanding",	&fhosted, NULL, OPT_INVERSE },
+	{ "hosted",		&fhosted },
 	{ "linearize",		NULL,	handle_fpasses,	PASS_LINEARIZE },
 	{ "max-warnings=",	NULL,	handle_fmax_warnings },
 	{ "mem-report",		&fmem_report },
@@ -1300,6 +1303,7 @@ static void predefined_macros(void)
 	predefine("__GNUC_PATCHLEVEL__", 1, "%d", gcc_patchlevel);
 
 	predefine("__STDC__", 1, "1");
+	predefine("__STDC_HOSTED__", 0, fhosted ? "1" : "0");
 	switch (standard) {
 	default:
 		break;
diff --git a/lib.h b/lib.h
index e767840c..4f67958e 100644
--- a/lib.h
+++ b/lib.h
@@ -202,6 +202,7 @@ extern int dbg_postorder;
 extern unsigned int fmax_warnings;
 extern int fmem_report;
 extern unsigned long fdump_ir;
+extern int fhosted;
 extern unsigned long long fmemcpy_max_count;
 extern unsigned long fpasses;
 extern int fpic;
diff --git a/validation/preprocessor/freestanding.c b/validation/preprocessor/freestanding.c
new file mode 100644
index 00000000..7ee35354
--- /dev/null
+++ b/validation/preprocessor/freestanding.c
@@ -0,0 +1,11 @@
+__STDC_HOSTED__
+
+/*
+ * check-name: freestanding
+ * check-command: sparse -E -ffreestanding $file
+ *
+ * check-output-start
+
+0
+ * check-output-end
+ */
diff --git a/validation/preprocessor/hosted.c b/validation/preprocessor/hosted.c
new file mode 100644
index 00000000..e6b3d3c1
--- /dev/null
+++ b/validation/preprocessor/hosted.c
@@ -0,0 +1,11 @@
+__STDC_HOSTED__
+
+/*
+ * check-name: hosted
+ * check-command: sparse -E -fhosted $file
+ *
+ * check-output-start
+
+1
+ * check-output-end
+ */