Fix broken build under Debian Wheezy.

With the toolchain under Wheezy (GCC 4.7.2 and binutils 2.22), using
both -fPIE and -fPIC does not create pic object files, which the build
of Bazel seems to expect as of ee8fcd3.

--
Change-Id: I0a33d1bc6dc0e3cdcffb473d4e78dac1a6b8ab41
Reviewed-on: https://bazel-review.googlesource.com/#/c/1690/
MOS_MIGRATED_REVID=104093416

src/main/cpp/BUILD

@@ -26,6 +26,15 @@ cc_library(
         "blaze_util.h",
         "blaze_util_platform.h",
     ],
+    linkopts = select({
+        "//src:darwin": [
+        ],
+        "//src:freebsd": [
+        ],
+        "//conditions:default": [
+            "-lrt",
+        ],
+    }),
     visibility = ["//visibility:public"],
     deps = [
         "//src/main/cpp/util",

tools/cpp/CROSSTOOL

@@ -159,8 +159,6 @@ toolchain {
   compiler_flag: "-U_FORTIFY_SOURCE"
   compiler_flag: "-D_FORTIFY_SOURCE=1"
   compiler_flag: "-fstack-protector"
-  compiler_flag: "-fPIE"
-  linker_flag: "-pie"
   linker_flag: "-Wl,-z,relro,-z,now"
 
   # Enable coloring even if there's no attached terminal. Bazel removes the
@@ -272,7 +270,6 @@ toolchain {
   # Conservative choice; -D_FORTIFY_SOURCE=2 may be unsafe in some cases.
   compiler_flag: "-D_FORTIFY_SOURCE=1"
   compiler_flag: "-fstack-protector"
-  compiler_flag: "-fPIE"
 
   # Enable coloring even if there's no attached terminal. Bazel removes the
   # escape sequences if --nocolor is specified.
@@ -380,8 +377,6 @@ toolchain {
   compiler_flag: "-U_FORTIFY_SOURCE"
   compiler_flag: "-D_FORTIFY_SOURCE=1"
   compiler_flag: "-fstack-protector"
-  compiler_flag: "-fPIE"
-  linker_flag: "-pie"
   linker_flag: "-Wl,-z,relro,-z,now"
 
   # Enable coloring even if there's no attached terminal. Bazel removes the