[freetype2] master 1d6773e: Add check for librt, needed for `ftbench' (#52824).

[Werner LEMBERG]

branch: master
commit 1d6773e6d999c37e7927c5d9cc48fb87d0dbf0cb
Author: Werner Lemberg <address@hidden>
Commit: Werner Lemberg <address@hidden>

    Add check for librt, needed for `ftbench' (#52824).
    
    * builds/unix/configure.raw: Call AC_USE_SYSTEM_EXTENSIONS.
    (LIB_CLOCK_GETTIME): Define; this will hold `-lrt' if necessary.
    
    * builds/unix/unix-cc.in (LIB_CLOCK_GETTIME): New variable.
---
 ChangeLog                 |  9 +++++++++
 builds/unix/configure.raw | 15 +++++++++++++++
 builds/unix/unix-cc.in    |  3 ++-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 5edd30b..cf55aa6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2018-01-07  Werner Lemberg  <address@hidden>
+
+       Add check for librt, needed for `ftbench' (#52824).
+
+       * builds/unix/configure.raw (LIB_CLOCK_GETTIME): Define; this will
+       hold `-lrt' if necessary.
+
+       * builds/unix/unix-cc.in (LIB_CLOCK_GETTIME): New variable.
+
 2018-01-07  Ewald Hew  <address@hidden>
 
        [psaux] Fix Type 1 glyphs with too many stem hints.
diff --git a/builds/unix/configure.raw b/builds/unix/configure.raw
index 126e091..b5d11b2 100644
--- a/builds/unix/configure.raw
+++ b/builds/unix/configure.raw
@@ -509,6 +509,21 @@ if test x"$with_harfbuzz" = xyes -a "$have_harfbuzz" = no; 
then
 fi
 
 
+# check for librt
+#
+# We need `clock_gettime' for the `ftbench' demo program.
+#
+# The code is modeled after gnulib's file `clock_time.m4', ignoring
+# very old Solaris systems.
+
+LIB_CLOCK_GETTIME=
+AC_SEARCH_LIBS([clock_gettime],
+               [rt],
+               [test "$ac_cv_search_clock_gettime" = "none required" \
+                || LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
+AC_SUBST([LIB_CLOCK_GETTIME])
+
+
 # Some options handling SDKs/archs in CFLAGS should be copied
 # to LDFLAGS. Apple TechNote 2137 recommends to include these
 # options in CFLAGS but not in LDFLAGS.
diff --git a/builds/unix/unix-cc.in b/builds/unix/unix-cc.in
index 9b888c7..a06246d 100644
--- a/builds/unix/unix-cc.in
+++ b/builds/unix/unix-cc.in
@@ -93,7 +93,8 @@ CC    := $(LIBTOOL) --mode=compile $(CCraw)
 
 # Linker flags.
 #
-LDFLAGS := @LDFLAGS@
+LDFLAGS           := @LDFLAGS@
+LIB_CLOCK_GETTIME := @LIB_CLOCK_GETTIME@  # for ftbench
 
 
 # export symbols