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Test whether the compiler supports -fvisibility=hidden

--- a/configure.ac

+++ b/configure.ac

@@ -113,9 +113,18 @@

   AC_DEFINE([ENABLE_ASSERTIONS], , [Assertions])

 fi])

+saved_CFLAGS="$CFLAGS"

+CFLAGS="$CFLAGS -fvisibility=hidden"

+AC_MSG_CHECKING([if ${CXX} supports -fvisibility=hidden])

+AC_COMPILE_IFELSE([char foo;],

+      [ AC_MSG_RESULT([yes])

+        SYMBOL_VISIBILITY="-fvisibility=hidden" ],

+        AC_MSG_RESULT([no]))

+CFLAGS="$saved_CFLAGS $SYMBOL_VISIBILITY"

+AC_SUBST(SYMBOL_VISIBILITY)

+

 if test $ac_cv_c_compiler_gnu = yes ; then

-        CFLAGS="$CFLAGS -fvisibility=hidden -W -Wstrict-prototypes -Wall -Wextra -Wcast-align -Wnested-externs -Wshadow -Wno-parentheses -Wno-unused-parameter -Wno-sign-compare"

-        #CFLAGS="$CFLAGS -fvisibility=hidden -W -Wstrict-prototypes -Wmissing-prototypes -Wall -Waggregate-return -Wcast-align -Wcast-qual -Wnested-externs -Wshadow -Wno-parentheses"

+        CFLAGS="$CFLAGS -W -Wstrict-prototypes -Wall -Wextra -Wcast-align -Wnested-externs -Wshadow -Wno-parentheses -Wno-unused-parameter -Wno-sign-compare"

 fi

 AC_C99_FUNC_LRINTF