Due mainly to circumstances beyond my control, it is now possible to build
the volk library on Cygwin :-). Previously, there was no support for C99
complex data types in the Cygwin library, but this was fixed by the release
of Cygwin 1.7.8-1 this past Tuesday.
The remaining issues can be addressed by patches or workarounds:
(1) configure fails while testing for -lboost_unit_test_framework because
of the presence of "-Wl,--enable-runtime-pseudo-reloc" in LDFLAGS. I'm not
sure why it is a problem, but I don't think these flags are needed at all in
this situation.
(2) C++ libraries are not found because
volk/config/gcc_version_workaround.m4 specifies -nostdinc++ without knowing
where to find the libraries on Cygwin. My suggestion is to exempt Cygwin
from the action of gcc_version_workaround.m4.
Changes to fix both of these (for Cygwin, anyway) are in the attached patch
file.
(3) volk_16i_x4_quad_max_star_16i_a16.h triggers an internal compiler error
in the Cygwin gcc 3.4.4-999. One workaround is to remove "-O2" from the
Makefile. (An obvious suggestion is to use a newer compiler, but the last
time I tried it Cygwin gcc 4.x couldn't handle the exceptions generated
while looking for a working circular buffer strategy. I will check again
from time to time to see if the latest compiler works.)
The bottom line is that we can now build volk (and the GNU Radio 'next'
branch) on Cygwin.
-- Don W.
diff --git a/volk/config/gcc_version_workaround.m4
b/volk/config/gcc_version_workaround.m4
old mode 100644
new mode 100755
index b3ba0b6..3cd8a0c
--- a/volk/config/gcc_version_workaround.m4
+++ b/volk/config/gcc_version_workaround.m4
@@ -1,7 +1,11 @@
AC_DEFUN([LV_GCC_VERSION_WORKAROUND],
[
+ case "${host_os}" in
+ *cygwin*)
+ ;;
+ *)
AC_REQUIRE([LF_CONFIGURE_CXX])
cxx_version=`$CXX --version`
cxx_major_version=`echo $cxx_version | sed 's/[[^)]]*)
\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\).*/\1/'`
@@ -42,8 +46,8 @@ AC_DEFUN([LV_GCC_VERSION_WORKAROUND],
fi
-
+ esac
])
\ No newline at end of file
diff --git a/volk/config/lv_configure.m4 b/volk/config/lv_configure.m4
old mode 100644
new mode 100755
index f98b2dc..dfa490c
--- a/volk/config/lv_configure.m4
+++ b/volk/config/lv_configure.m4
@@ -96,16 +96,17 @@ dnl AM_CONDITIONAL([USE_PYTHON], [test "$with_python" =
yes])
AC_HEADER_TIME
AC_C_BIGENDIAN
dnl Check for Mingw support
GR_PWIN32
- GR_LIBGNURADIO_CORE_EXTRA_LDFLAGS
+ dnl GR_LIBGNURADIO_CORE_EXTRA_LDFLAGS
dnl Check for liborc
ORC_CHECK
- LDFLAGS="$LDFLAGS $LIBGNURADIO_CORE_EXTRA_LDFLAGS"
+ dnl Following causes test for -lboost_unit_test_framework to fail on Cygwin
+ dnl LDFLAGS="$LDFLAGS $LIBGNURADIO_CORE_EXTRA_LDFLAGS"
AC_CHECK_PROG([XMLTO],[xmlto],[yes],[])
AM_CONDITIONAL([HAS_XMLTO], [test x$XMLTO = xyes])
dnl Define where to look for cppunit includes and libs
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