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configure.ac: add lcov flags option, beautify help output

--- a/configure.ac

+++ b/configure.ac

@@ -34,7 +34,7 @@

 dnl Enable debugging (no)

 AC_ARG_ENABLE(debug,

-  [  --enable-debug[[=value]]  compile with debug [[default=no]]],

+  AC_HELP_STRING([--enable-debug],[compile in debug mode [[default=no]]]),

   with_debug="yes",

   with_debug="no")

 if test "$with_debug" = "yes"

@@ -45,7 +45,7 @@

 dnl Enable full warnings (yes)

 AC_ARG_ENABLE(warnings,

-  [  --enable-warnings[[=value]] compile with all gcc warnings [[default=yes]]],

+  AC_HELP_STRING([--enable-warnings],[compile with all gcc warnings [[default=yes]]]),

   with_warnme="no",

   with_warnme="yes")

 if test "$with_warnme" = "yes"

@@ -66,10 +66,17 @@

   fi

 fi

+dnl fail on compilation warnings 

 AC_ARG_ENABLE(errorfail,

-  [  --enable-errorfail[[=value]]  fail on compilation warnings [[default=no]]],

+  AC_HELP_STRING([--enable-errorfail],[fail on compilation warnings [[default=no]]]),

   AUBIO_CFLAGS="$AUBIO_CFLAGS -Werror -Wmissing-prototypes -Wmissing-declarations -Wno-unused-parameter",

-  with_warnme="no")

+  with_errorfail="no")

+

+dnl add gcov/lcov profiling and coverage flags

+AC_ARG_ENABLE(lcov,

+  AC_HELP_STRING([--enable-lcov],[compile with gcov/lcov profiling flags [[default=no]]]),

+  AUBIO_CFLAGS="$AUBIO_CFLAGS -fprofile-arcs -ftest-coverage",

+  with_lcov="no")

 dnl Check for libtool

 AC_LIBTOOL_DLOPEN