[libunwind] r296135 - [libunwind] Disable calls to fprintf for baremetal targets.

[Ranjeet Singh via cfe-commits]

Author: rsingh
Date: Fri Feb 24 10:38:05 2017
New Revision: 296135

URL: http://llvm.org/viewvc/llvm-project?rev=296135&view=rev
Log:
[libunwind] Disable calls to fprintf for baremetal targets.

We've been having issues with using libcxxabi and libunwind for baremetal
targets because fprintf is dependent on io functions, this patch disables calls
to fprintf when building for baremetal in release mode.

Differential Revision: https://reviews.llvm.org/D30340


Modified:
    libunwind/trunk/src/config.h

Modified: libunwind/trunk/src/config.h
URL: http://llvm.org/viewvc/llvm-project/libunwind/trunk/src/config.h?rev=296135&r1=296134&r2=296135&view=diff
==============================================================================
--- libunwind/trunk/src/config.h (original)
+++ libunwind/trunk/src/config.h Fri Feb 24 10:38:05 2017
@@ -78,6 +78,12 @@
 #define _LIBUNWIND_BUILD_ZERO_COST_APIS 0
 #endif
 
+#if defined(NDEBUG) && defined(_LIBUNWIND_IS_BAREMETAL)
+#define _LIBUNWIND_ABORT(msg)                                                  \
+  do {                                                                         \
+    abort();                                                                   \
+  } while (0)
+#else
 #define _LIBUNWIND_ABORT(msg)                                                  \
   do {                                                                         \
     fprintf(stderr, "libunwind: %s %s:%d - %s\n", __func__, __FILE__,          \
@@ -85,9 +91,14 @@
     fflush(stderr);                                                            \
     abort();                                                                   \
   } while (0)
+#endif
 
+#if defined(NDEBUG) && defined(_LIBUNWIND_IS_BAREMETAL)
+#define _LIBUNWIND_LOG(msg, ...)
+#else
 #define _LIBUNWIND_LOG(msg, ...)                                               \
   fprintf(stderr, "libunwind: " msg "\n", __VA_ARGS__)
+#endif
 
 #if defined(_LIBUNWIND_HAS_NO_THREADS)
   // only used with pthread calls, not needed for the single-threaded builds