build: Check and set perf --log-fd option

Linux perf tool version 3.2 introduced a new option "--log-fd" defaults
to 0, which leads to error "Failed opening logfd: Illegal argument" when
executing perf tests.

Set logfd to stderr to let perf test work.

Issue rust-lang#1538

Author: lht

configure

@@ -363,6 +363,16 @@ then
     err "either clang or gcc is required"
 fi
 
+if [ ! -z "$CFG_PERF" ]
+then
+    $CFG_PERF --log-fd 2>&1 | grep 'unknown option' > /dev/null
+    if [ ! -z $? ];
+    then
+        CFG_PERF_WITH_LOGFD=1
+        putvar CFG_PERF_WITH_LOGFD
+    fi
+fi
+
 step_msg "making directories"
 
 for i in \

mk/platform.mk

@@ -58,7 +58,11 @@ ifneq ($(findstring linux,$(CFG_OSTYPE)),)
   CFG_LDENV := LD_LIBRARY_PATH
   CFG_DEF_SUFFIX := .linux.def
   ifdef CFG_PERF
+    ifdef CFG_PERF_WITH_LOGFD
+	CFG_PERF_TOOL := $(CFG_PERF) stat -r 3 --log-fd 2
+    else
 	CFG_PERF_TOOL := $(CFG_PERF) stat -r 3
+    endif
   else
     ifdef CFG_VALGRIND
       CFG_PERF_TOOL :=\