[please don't top-post on technical lists] On 04/14/2011 12:39 PM, Too, Justin A. wrote: > Hi Eric, > > Sorry, here you are: Thanks. > > I've tried many permutations of quoting, but obviously I'm missing a > fundamental understanding for this use case: > > ------------------------------------------------------------------------ > > AC_DEFUN([SUPPORT_TEST], > [ > AC_MSG_CHECKING([for test]) > > test_executable="$$][(top_builddir)/scripts/test/bin/my_test" Why the $$ here? M4 doesn't give $$ any special treatment, and the m4 end-quote/start-quote sequence of ][ doesn't really matter. You ended up creating the following line of shell code: test_executable="$$(top_builddir)/scripts/test/bin/my_test" and, at shell time, $$ is the process id, explaining your results. > AC_SUBST(QMTEST, [$test_executable]) While this line works as-is (provided QMTEST is not an m4 macro name), you are better off getting in the habit of recommended quoting style: AC_SUBST([QMTEST], [$test_executable]) > > 22839(top_builddir)/scripts/test_harness/test/bin/my_test > > I need > > $(top_builddir)/scripts/test_harness/test/bin/my_test Then use: test_executable="\$(top_builddir)/scripts/test/bin/my_test" to get a literal $ into the contents of $test_executable, or: test_executable="$top_builddir/scripts/test/bin/my_test" if you wanted the shell to expand $top_builddir prior to assigning to $test_executable. At any rate, neither line variant contains anything that requires extra m4 quoting or escaping. -- Eric Blake eblake@xxxxxxxxxx +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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