analyzer: Support errno for newlib

Without this definition, the errno definition for newlib
isn't recognized as such, and these tests fail for newlib
targets:

FAIL: gcc.dg/analyzer/call-summaries-errno.c  (test for warnings, line 16)
FAIL: gcc.dg/analyzer/call-summaries-errno.c (test for excess errors)
FAIL: gcc.dg/analyzer/errno-1.c  (test for warnings, line 20)
FAIL: gcc.dg/analyzer/errno-1.c (test for excess errors)
FAIL: gcc.dg/analyzer/flex-without-call-summaries.c (test for excess errors)
FAIL: gcc.dg/analyzer/isatty-1.c  (test for warnings, line 31)
FAIL: gcc.dg/analyzer/isatty-1.c  (test for warnings, line 35)
FAIL: gcc.dg/analyzer/isatty-1.c  (test for warnings, line 46)
FAIL: gcc.dg/analyzer/isatty-1.c  (test for warnings, line 56)
FAIL: gcc.dg/analyzer/isatty-1.c (test for excess errors)

gcc/analyzer:
	* kf.cc (register_known_functions): Add __errno function for newlib.

diff --git a/gcc/analyzer/kf.cc b/gcc/analyzer/kf.cc
index 3a91b6b..ed5f703 100644 (file)
--- a/gcc/analyzer/kf.cc
+++ b/gcc/analyzer/kf.cc
@@ -1033,9 +1033,11 @@ register_known_functions (known_function_manager &kfm)
        and OS X like this:
         extern int * __error(void);
         #define errno (*__error())
+       and similarly __errno for newlib.
        Add these as synonyms for "__errno_location".  */
     kfm.add ("___errno", make_unique<kf_errno_location> ());
     kfm.add ("__error", make_unique<kf_errno_location> ());
+    kfm.add ("__errno", make_unique<kf_errno_location> ());
   }
 
   /* Language-specific support functions.  */