36 lines
980 B
Text
36 lines
980 B
Text
dnl @synopsis CHECK_VISIBILITY([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
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dnl
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dnl @summary check for the gcc -fvisibility flag
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dnl
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AC_DEFUN([CHECK_VISIBILITY_HIDDEN], [
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save_CFLAGS="$CFLAGS"
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VISIBILITY_HIDDEN_CFLAGS=""
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OPTION=-fvisibility=hidden
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AC_MSG_CHECKING(for gcc $OPTION support)
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CFLAGS="$CFLAGS $OPTION"
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AC_TRY_COMPILE([
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int default_vis __attribute__ ((visibility("default")));
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int hidden_vis __attribute__ ((visibility("hidden")));
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],
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[],
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ac_visibility_supported=yes,
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ac_visibility_supported=no)
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AC_MSG_RESULT($ac_visibility_supported)
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if test x"$ac_visibility_supported" = xyes; then
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ifelse([$1],,AC_DEFINE(HAVE_GCC_VISIBILITY,1,[Define if you have gcc -fvisibility=hidden support ]),[$1])
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VISIBILITY_HIDDEN_CFLAGS="$OPTION -DHAVE_VISIBILITY_HIDDEN"
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AC_DEFINE(HAVE_VISIBILITY_HIDDEN,[],[Support for visibility hidden])
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else
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$2
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:
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fi
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AC_SUBST(VISIBILITY_HIDDEN_CFLAGS)
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CFLAGS="$save_CFLAGS"
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])
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