Fix compilation for ARM/uClibc

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index 9028fd0238a9d5b1cae6672c7cb10cf77c05046a..9e4dd8b97f31d98d0377eef46b593de7f37edf80 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -1025,7 +1025,8 @@ static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
   sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_RBP]);
 #elif V8_HOST_ARCH_ARM
 // An undefined macro evaluates to 0, so this applies to Android's Bionic also.
-#if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
+#if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3) && \
+     !defined(__UCLIBC__))
   sample->pc = reinterpret_cast<Address>(mcontext.gregs[R15]);
   sample->sp = reinterpret_cast<Address>(mcontext.gregs[R13]);
   sample->fp = reinterpret_cast<Address>(mcontext.gregs[R11]);
@@ -1033,7 +1034,8 @@ static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
   sample->pc = reinterpret_cast<Address>(mcontext.arm_pc);
   sample->sp = reinterpret_cast<Address>(mcontext.arm_sp);
   sample->fp = reinterpret_cast<Address>(mcontext.arm_fp);
-#endif  // (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
+#endif  // (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3) &&
+        //  !defined(__UCLIBC__))
 #elif V8_HOST_ARCH_MIPS
   sample->pc = reinterpret_cast<Address>(mcontext.pc);
   sample->sp = reinterpret_cast<Address>(mcontext.gregs[29]);