[gnome-builder] build: check for shm_open() instead of forced -lrt

[Christian Hergert <chergert src gnome org>]

commit 0b04fe6d8302179659970850d4e46e39118144ae
Author: Christian Hergert <christian hergert me>
Date:   Tue May 12 10:37:13 2015 -0700

    build: check for shm_open() instead of forced -lrt
    
    Not all systems require rt for shm_open(), nor is it guaranteed to be the
    library containing it.

 configure.ac            |    8 ++++++++
 contrib/egg/Makefile.am |    5 ++++-
 libide/Makefile.am      |    1 +
 tools/Makefile.am       |    2 +-
 4 files changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 211249b..ffa0b75 100644
--- a/configure.ac
+++ b/configure.ac
@@ -317,6 +317,14 @@ AC_SUBST(OPTIMIZE_LDFLAGS)
 
 
 dnl ***********************************************************************
+dnl Check if shm_open Requires a Library
+dnl ***********************************************************************
+AC_CHECK_FUNCS([shm_open], [SHM_LIB=],
+               [AC_CHECK_LIB([rt], [shm_open], [SHM_LIB=-lrt], [SHM_LIB=])])
+AC_SUBST(SHM_LIB)
+
+
+dnl ***********************************************************************
 dnl Process .in Files
 dnl ***********************************************************************
 AC_CONFIG_FILES([
diff --git a/contrib/egg/Makefile.am b/contrib/egg/Makefile.am
index 598dbca..a9839d5 100644
--- a/contrib/egg/Makefile.am
+++ b/contrib/egg/Makefile.am
@@ -18,6 +18,9 @@ libegg_la_SOURCES = \
        $(NULL)
 
 libegg_la_CFLAGS = $(EGG_CFLAGS)
-libegg_la_LIBADD = $(EGG_LIBS)
+libegg_la_LIBADD = \
+       $(EGG_LIBS) \
+       $(SHM_LIB) \
+       $(NULL)
 
 -include $(top_srcdir)/git.mk
diff --git a/libide/Makefile.am b/libide/Makefile.am
index 642f542..d634de2 100644
--- a/libide/Makefile.am
+++ b/libide/Makefile.am
@@ -383,6 +383,7 @@ libide_1_0_la_LDFLAGS = \
 libide_1_0_la_LIBADD = \
        $(CLANG_LDFLAGS) \
        $(LIBIDE_LIBS) \
+       $(SHM_LIB) \
        -lclang \
        -lm \
        $(top_builddir)/contrib/egg/libegg.la \
diff --git a/tools/Makefile.am b/tools/Makefile.am
index 012c164..8d0cdb2 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -60,7 +60,7 @@ ide_list_counters_CFLAGS = \
 ide_list_counters_LDADD = \
        $(EGG_LIBS) \
        $(top_builddir)/contrib/egg/libegg.la \
-       -lrt \
+       $(SHM_LIB) \
        $(NULL)
 
 -include $(top_srcdir)/git.mk