Build gtest as part of the project

Google Test does not recommend using precompiled gtest libraries. See:

http://code.google.com/p/googletest/wiki/FAQ#Why_is_it_not_recommended_to_install_a_pre-compiled_copy_of_Goog

This change modifies the build system so the examples build the gtest
and xorg-gtest libraries and link against the locally built libraries
instead of any other precompiled libraries on the system. It uses the
same compiler flags to compile everything so the C++ One-Definition Rule
is not broken.

Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Reviewed-By: Christopher Halse Rogers <christopher.halse.rogers@canonical.com>

1 files changed, 55 insertions, 16 deletions

diff --git a/m4/gtest.m4 b/m4/gtest.m4
index cd41b21..2de334c 100644
--- a/m4/gtest.m4
+++ b/m4/gtest.m4
@@ -1,24 +1,63 @@
-# Checks whether the gtest library is available on the system
-# Allows for adjusting the include and library path.
-# Sets have_gtest=yes if the library is present and
-# reports the compiler and linker flags in 
-# GTEST_CXXFLAGS AND GTEST_LDFLAGS, respectively.
-AC_DEFUN([AC_CHECK_GTEST],
+# Copyright (C) 2012 Canonical, Ltd.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice (including the next
+# paragraph) shall be included in all copies or substantial portions of the
+# Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+# Checks whether the gtest source is available on the system. Allows for
+# adjusting the include and source path. Sets have_gtest=yes if the source is
+# present. Sets GTEST_CPPFLAGS and GTEST_SOURCE to the preprocessor flags and
+# source location respectively.
+AC_DEFUN([CHECK_GTEST],
 [
   AC_ARG_WITH([gtest-include-path],
-  [AS_HELP_STRING([--with-gtest-include-path],
-    [location of the Google test headers, defaults to /usr/include])],
-  [GTEST_CPPFLAGS="-I$withval"])
+              [AS_HELP_STRING([--with-gtest-include-path],
+                              [location of the Google test headers])],
+              [GTEST_CPPFLAGS="-I$withval"])
+
+  AC_ARG_WITH([gtest-source-path],
+              [AS_HELP_STRING([--with-gtest-source-path],
+                              [location of the Google test sources, defaults to /usr/src/gtest])],
+              [GTEST_SOURCE="$withval"],
+              [GTEST_SOURCE="/usr/src/gtest"])
+
+  GTEST_CPPFLAGS="$GTEST_CPPFLAGS -I$GTEST_SOURCE"
 
-  AC_ARG_WITH([gtest-lib-path],
-  [AS_HELP_STRING([--with-gtest-lib-path], [location of the Google test libraries])],
-  [GTEST_LDFLAGS="-L$withval -lpthread"],
-  [GTEST_LDFLAGS='-lpthread'])
+  AC_LANG_PUSH([C++])
 
-  AC_LANG_PUSH(C++)
+  tmp_CPPFLAGS="$CPPFLAGS"
+  CPPFLAGS="$CPPFLAGS $GTEST_CPPFLAGS"
 
-  AC_CHECK_LIB([gtest], [main], [:], [:], [$GTEST_LDFLAGS])
+  AC_CHECK_HEADER([gtest/gtest.h])
+
+  CPPFLAGS="$tmp_CPPFLAGS"
 
   AC_LANG_POP
-]) # AC_CHECK_GTEST
 
+  AC_CHECK_FILES([$GTEST_SOURCE/src/gtest-all.cc]
+                 [$GTEST_SOURCE/src/gtest_main.cc],
+                 [have_gtest_source=yes],
+                 [have_gtest_source=no])
+
+  AS_IF([test "x$ac_cv_header_gtest_gtest_h" = xyes -a \
+              "x$have_gtest_source" = xyes],
+        [have_gtest=yes]
+        [AC_SUBST(GTEST_CPPFLAGS)]
+        [AC_SUBST(GTEST_SOURCE)],
+        [have_gtest=no])
+]) # CHECK_GTEST