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@@ -9,7 +9,23 @@ AC_CONFIG_HEADERS([config.h])
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# Checks for programs.
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AC_PROG_CXX
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+
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+# Libtool configuration
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+#
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+# On FreeBSD (and probably some others), clang++ does not meet an autoconf
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+# assumption in identifying libtool configuration regarding shared library:
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+# the configure script will execute "$CC -shared $CFLAGS -v -o" and expect
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+# the output contains -Lxxx or -Ryyy. This is the case for g++, but not for
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+# clang++, and, as a result, it will cause various errors in linking programs
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+# or running them with a shared object (such as some of our python scripts).
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+# To work around this problem we define a temporary variable
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+# "CXX_LIBTOOL_LDFLAGS". It's expected to be defined as, e.g, "-L/usr/lib"
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+# to temporarily fake the output so that it will be compatible with that of
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+# g++.
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+CFLAGS_SAVED=$CFLAGS
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+CFLAGS="$CFLAGS $CXX_LIBTOOL_LDFLAGS"
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AC_PROG_LIBTOOL
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+CFLAGS=$CFLAGS_SAVED
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# Use C++ language
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AC_LANG([C++])
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JINMEI Tatuya