Allow --with-rt configure option

configure.ac

@@ -1366,6 +1366,7 @@ AM_CONDITIONAL([USE_LIBMEDIAINFO], [test "x$libmediainfo" = "xtrue"])
 #
 openssl=false
 cares=false
+rt=undef
 if test "x$WIN32" = "xno" ; then
 
     AC_ARG_WITH([poll],
@@ -1378,12 +1379,71 @@ if test "x$WIN32" = "xno" ; then
         LDFLAGS="-pthread $LDFLAGS"
     fi
 
-    # librt #TODO: allow --with-rt=...
-    AC_CHECK_LIB([rt], [aio_write], [
-    SAVE_LDFLAGS="-lrt $SAVE_LDFLAGS"
-    LDFLAGS="-lrt $LDFLAGS"
-    AC_DEFINE(HAVE_AIO_RT, [1], [Define to indicate AIO presence in librt])
-    ],
+    # librt
+    AC_MSG_CHECKING(for rt)
+    AC_ARG_WITH([rt],
+      AS_HELP_STRING(--with-rt=PATH, base of Real-time Library installation),
+      [
+       case $with_rt in
+       no)
+            AC_MSG_RESULT([no])
+
+            rt=false
+         ;;
+       yes)
+            AC_CHECK_HEADERS([aio.h], [],
+                AC_MSG_ERROR([aio.h header not found or not usable])
+            )
+            AC_CHECK_LIB(rt, [aio_write], [LIBRT_LIBS="$LIBRT_LIBS -lrt"],
+                AC_MSG_ERROR([Could not find rt library!])
+            )
+
+            AC_SUBST(LIBRT_LIBS)
+            rt=true
+         ;;
+       *)
+        # determine if library is installed
+        if test -d "$with_rt/lib"; then
+            LDFLAGS="-L$with_rt/lib $LDFLAGS"
+            CXXFLAGS="-I$with_rt/include $CXXFLAGS"
+
+            AC_CHECK_HEADERS([aio.h], [
+                LIBRT_LDFLAGS="-L$with_rt/lib"
+                LIBRT_CXXFLAGS="-I$with_rt/include"],
+                AC_MSG_ERROR([aio.h header not found or not usable])
+            )
+
+            AC_CHECK_LIB(rt, [aio_write], [LIBRT_LIBS="$LIBRT_LIBS -lrt"],
+                AC_MSG_ERROR([Could not find rt library!])
+            )
+        else
+            AC_MSG_ERROR([Could not find rt library in "$with_rt/lib"!])
+        fi
+
+        AC_SUBST(LIBRT_LDFLAGS)
+        AC_SUBST(LIBRT_CXXFLAGS)
+        AC_SUBST(LIBRT_LIBS)
+        rt=true
+
+        #restore
+        LDFLAGS=$SAVE_LDFLAGS
+        CXXFLAGS=$SAVE_CXXFLAGS
+        ;;
+       esac
+      ],
+      [
+        AC_MSG_RESULT([--with-rt not specified])
+
+        AC_CHECK_HEADERS([aio.h], [],
+            AC_MSG_ERROR([aio.h header not found or not usable])
+        )
+        AC_CHECK_LIB(rt, [aio_write], [LIBRT_LIBS="$LIBRT_LIBS -lrt"],
+            AC_MSG_NOTICE([Could not find librt])
+        )
+
+        AC_SUBST(LIBRT_LIBS)
+        rt=true
+      ]
     )
 
     # OpenSSL
@@ -1695,6 +1755,12 @@ AS_IF([test "x$LINUX" = xyes -o "x$DARWIN" = xyes], [
 dnl Let AM know whether we found a fuse backend.
 AM_CONDITIONAL([WITH_FUSE], [test "x$enable_fuse" != xno])
 
+# define on all platforms
+AM_CONDITIONAL(HAVE_RT, test x$rt = xtrue)
+if test "x$rt" = "xtrue" ; then
+    AC_DEFINE(HAVE_AIO_RT, [1], [Define to indicate AIO presence in librt])
+fi
+
 # define on all platforms
 AM_CONDITIONAL(HAVE_OPENSSL, test x$openssl = xtrue)
 if test "x$openssl" = "xtrue" ; then
@@ -2322,6 +2388,7 @@ AC_MSG_NOTICE([Configured to build Mega SDK:
   PCRE:             $PCRE_CXXFLAGS $PCRE_LDFLAGS $PCRE_LIBS
   LIBUV:            $LIBUV_CXXFLAGS $LIBUV_LDFLAGS $LIBUV_LIBS
   LIBRAW:           $LIBRAW_CXXFLAGS $LIBRAW_LDFLAGS $LIBRAW_LIBS
+  LIBRT:            $LIBRT_CXXFLAGS $LIBRT_LDFLAGS $LIBRT_LIBS
   LIBMEDIAINFO:     $LIBMEDIAINFO_CXXFLAGS $LIBMEDIAINFO_LDFLAGS $LIBMEDIAINFO_LIBS
   FFMPEG:           $FFMPEG_CXXFLAGS $FFMPEG_LDFLAGS $FFMPEG_LIBS
   FUSE:             $FUSE_CPPFLAGS $FUSE_LDFLAGS $FUSE_LIBS

src/include.am

@@ -5,14 +5,14 @@ lib_LTLIBRARIES = src/libmega.la
 if WIN32
 src_libmega_la_CXXFLAGS = -D_WIN32=1 -Iinclude/ -Iinclude/mega/win32 $(LIBS_EXTRA) $(ZLIB_CXXFLAGS) $(LIBUV_CXXFLAGS) $(LIBRAW_CXXFLAGS) $(LIBMEDIAINFO_CXXFLAGS) $(FFMPEG_CXXFLAGS) $(CRYPTO_CXXFLAGS) $(SODIUM_CXXFLAGS) $(DB_CXXFLAGS) $(CXXFLAGS) $(WINHTTP_CXXFLAGS) $(FI_CXXFLAGS) $(PDF_CXXFLAGS) $(ICU_CXXFLAGS) $(PCRE_CXXFLAGS)
 else
-src_libmega_la_CXXFLAGS = $(CARES_FLAGS) $(LIBCURL_FLAGS) $(ZLIB_CXXFLAGS) $(LIBUV_CXXFLAGS) $(LIBRAW_CXXFLAGS) $(LIBMEDIAINFO_CXXFLAGS) $(FFMPEG_CXXFLAGS) $(CRYPTO_CXXFLAGS) $(SODIUM_CXXFLAGS) $(DB_CXXFLAGS) $(FI_CXXFLAGS) $(PDF_CXXFLAGS) $(ICU_CXXFLAGS) $(LIBSSL_FLAGS) $(PCRE_CXXFLAGS)
+src_libmega_la_CXXFLAGS = $(CARES_FLAGS) $(LIBCURL_FLAGS) $(ZLIB_CXXFLAGS) $(LIBUV_CXXFLAGS) $(LIBRAW_CXXFLAGS) $(LIBRT_CXXFLAGS) $(LIBMEDIAINFO_CXXFLAGS) $(FFMPEG_CXXFLAGS) $(CRYPTO_CXXFLAGS) $(SODIUM_CXXFLAGS) $(DB_CXXFLAGS) $(FI_CXXFLAGS) $(PDF_CXXFLAGS) $(ICU_CXXFLAGS) $(LIBSSL_FLAGS) $(PCRE_CXXFLAGS)
 endif
 
 # Libs
 if WIN32
 src_libmega_la_LIBADD = $(LIBS_EXTRA)  $(FFMPEG_LDFLAGS) $(FFMPEG_LIBS) $(LIBUV_LDFLAGS) $(LIBUV_LIBS) $(LIBRAW_LDFLAGS) $(LIBRAW_LIBS) $(LIBMEDIAINFO_LDFLAGS) $(LIBMEDIAINFO_LIBS) $(ZLIB_LDFLAGS) $(ZLIB_LIBS) $(CRYPTO_LDFLAGS) $(CRYPTO_LIBS) $(SODIUM_LDFLAGS) $(SODIUM_LIBS) $(DB_LDFLAGS) $(DB_LIBS) $(WINHTTP_LDFLAGS) $(WINHTTP_LIBS) $(FI_LDFLAGS) $(FI_LIBS) $(PDF_LDFLAGS) $(PDF_LIBS) $(ICU_LDFLAGS) $(ICU_LIBS) $(PCRE_LDFLAGS) $(PCRE_LIBS)
 else
-src_libmega_la_LIBADD = $(CARES_LDFLAGS) $(CARES_LIBS) $(LIBCURL_LIBS) $(FFMPEG_LDFLAGS) $(FFMPEG_LIBS) $(LIBUV_LDFLAGS) $(LIBUV_LIBS) $(LIBRAW_LDFLAGS) $(LIBRAW_LIBS) $(LIBMEDIAINFO_LDFLAGS) $(LIBMEDIAINFO_LIBS) $(ZLIB_LDFLAGS) $(ZLIB_LIBS) $(CRYPTO_LDFLAGS) $(CRYPTO_LIBS) $(SODIUM_LDFLAGS) $(SODIUM_LIBS) $(DB_LDFLAGS) $(DB_LIBS) $(FI_LDFLAGS) $(FI_LIBS) $(PDF_LDFLAGS) $(PDF_LIBS) $(ICU_LDFLAGS) $(ICU_LIBS) $(LIBSSL_LDFLAGS) $(LIBSSL_LIBS) $(PCRE_LDFLAGS) $(PCRE_LIBS)
+src_libmega_la_LIBADD = $(CARES_LDFLAGS) $(CARES_LIBS) $(LIBCURL_LIBS) $(FFMPEG_LDFLAGS) $(FFMPEG_LIBS) $(LIBUV_LDFLAGS) $(LIBUV_LIBS) $(LIBRAW_LDFLAGS) $(LIBRAW_LIBS) $(LIBRT_LDFLAGS) $(LIBRT_LIBS) $(LIBMEDIAINFO_LDFLAGS) $(LIBMEDIAINFO_LIBS) $(ZLIB_LDFLAGS) $(ZLIB_LIBS) $(CRYPTO_LDFLAGS) $(CRYPTO_LIBS) $(SODIUM_LDFLAGS) $(SODIUM_LIBS) $(DB_LDFLAGS) $(DB_LIBS) $(FI_LDFLAGS) $(FI_LIBS) $(PDF_LDFLAGS) $(PDF_LIBS) $(ICU_LDFLAGS) $(ICU_LIBS) $(LIBSSL_LDFLAGS) $(LIBSSL_LIBS) $(PCRE_LDFLAGS) $(PCRE_LIBS)
 endif
 
 # add library version