qemu-kvm/fix-librt-check.patch: Replace with fix from upstream qemu.git

pkgs/os-specific/linux/qemu-kvm/fix-librt-check.patch

@@ -1,17 +1,70 @@
-diff -Naur qemu-kvm-1.2.0-orig/configure qemu-kvm-1.2.0/configure
+commit 8bacde8d86a09699207d85d4bab06162aed18dc4
---- qemu-kvm-1.2.0-orig/configure	2012-09-06 04:31:27.000000000 -0400
+Author: Natanael Copa <natanael.copa@gmail.com>
-+++ qemu-kvm-1.2.0/configure	2013-02-15 11:04:45.923477251 -0500
+Date:   Wed Sep 12 09:06:51 2012 +0000
-@@ -2682,13 +2682,14 @@
+
+    configure: properly check if -lrt and -lm is needed
+    
+    Fixes build against uClibc.
+    
+    uClibc provides 2 versions of clock_gettime(), one with realtime
+    support and one without (this is so you can avoid linking in -lrt
+    unless actually needed). This means that the clock_gettime() don't
+    need -lrt. We still need it for timer_create() so we check for this
+    function in addition.
+    
+    We also need check if -lm is needed for isnan().
+    
+    Both -lm and -lrt are needed for libs_qga.
+    
+    Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
+    Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
+
+diff --git a/configure b/configure
+index 7656c32..9ab13db 100755
+--- a/configure
++++ b/configure
+@@ -2671,17 +2671,44 @@ fi
+ 
+ 
+ ##########################################
++# Do we need libm
++cat > $TMPC << EOF
++#include <math.h>
++int main(void) { return isnan(sin(0.0)); }
++EOF
++if compile_prog "" "" ; then
++  :
++elif compile_prog "" "-lm" ; then
++  LIBS="-lm $LIBS"
++  libs_qga="-lm $libs_qga"
++else
++  echo
++  echo "Error: libm check failed"
++  echo
++  exit 1
++fi
++
++##########################################
+ # Do we need librt
++# uClibc provides 2 versions of clock_gettime(), one with realtime
++# support and one without. This means that the clock_gettime() don't
++# need -lrt. We still need it for timer_create() so we check for this
++# function in addition.
  cat > $TMPC <<EOF
  #include <signal.h>
  #include <time.h>
 -int main(void) { return clock_gettime(CLOCK_REALTIME, NULL); }
-+int main(void) { return timer_gettime(CLOCK_REALTIME, NULL); }
++int main(void) {
++  timer_create(CLOCK_REALTIME, NULL, NULL);
++  return clock_gettime(CLOCK_REALTIME, NULL);
++}
  EOF
  
  if compile_prog "" "" ; then
    :
- elif compile_prog "" "-lrt" ; then
+-elif compile_prog "" "-lrt" ; then
++# we need pthread for static linking. use previous pthread test result
++elif compile_prog "" "-lrt $pthread_lib" ; then
    LIBS="-lrt $LIBS"
 +  libs_qga="-lrt $libs_qga"
  fi