[Qemu-trivial] [PATCH 2/4] fix build error on ARM due to wrong glibc check

[John Spencer]

the test for glibc < 2 "succeeds" wrongly for any non-glibc C library,
and breaks the build on musl libc.
we must first test if __GLIBC__ is defined at all, before using it
unconditionally.

Signed-off-by: John Spencer <address@hidden>

---
 user-exec.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/user-exec.c b/user-exec.c
index ef9b172..cccc145 100644
--- a/user-exec.c
+++ b/user-exec.c
@@ -442,7 +442,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
     unsigned long pc;
     int is_write;
 
-#if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
+#if defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ 
<= 3))
     pc = uc->uc_mcontext.gregs[R15];
 #else
     pc = uc->uc_mcontext.arm_pc;
-- 
1.7.3.4