[FFmpeg-cvslog] configure: Simplify some library checks via check_lib()

[Diego Biurrun]

ffmpeg | branch: master | Diego Biurrun <diego at biurrun.de> | Thu Dec  8 10:33:58 2016 +0100| [a7101eb40e69ada3872ec5aebe9c5c165745fb3a] | committer: Diego Biurrun

configure: Simplify some library checks via check_lib()

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a7101eb40e69ada3872ec5aebe9c5c165745fb3a
---

 configure | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/configure b/configure
index ac47c3d835..6ff5863491 100755
--- a/configure
+++ b/configure
@@ -4506,7 +4506,7 @@ check_func  mkstemp
 check_func  mmap
 check_func  mprotect
 # Solaris has nanosleep in -lrt, OpenSolaris no longer needs that
-check_func_headers time.h nanosleep || { check_func_headers time.h nanosleep -lrt && add_extralibs -lrt; }
+check_func_headers time.h nanosleep || check_lib time.h nanosleep -lrt
 check_func  sched_getaffinity
 check_func  setrlimit
 check_func  strerror_r
@@ -4581,14 +4581,12 @@ fi
 # do this before the optional library checks as some of them require pthreads
 if ! disabled pthreads && ! enabled w32threads; then
     enable pthreads
-    if check_func pthread_join -pthread; then
+    if check_lib pthread.h pthread_join -pthread; then
         add_cflags -pthread
-        add_extralibs -pthread
-    elif check_func pthread_join -pthreads; then
+    elif check_lib pthread.h pthread_join -pthreads; then
         add_cflags -pthreads
-        add_extralibs -pthreads
-    elif check_func pthread_join -lpthreadGC2; then
-        add_extralibs -lpthreadGC2
+    elif check_lib pthread.h pthread_join -lpthreadGC2; then
+        :
     elif check_lib pthread.h pthread_join -lpthread; then
         :
     elif ! check_func pthread_join; then