2004-01-07 18:34:40 +03:00
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dnl -*- shell-script -*-
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dnl
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dnl $HEADER$
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dnl
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define([LAM_CXX_FIND_EXCEPTION_FLAGS],[
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#
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# Arguments: none
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#
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# Dependencies: none
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#
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# Get the exception handling flags for the C++ compiler. Leaves
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# CXXFLAGS undisturbed.
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# Provides --with-exflags command line argument for configure as well.
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#
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# Sets LAM_CXX_EXCEPTION_CXXFLAGS and LAM_CXX_EXCEPTION_LDFLAGS as
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# appropriate.
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# Must call AC_SUBST manually
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#
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# Command line flags
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AC_ARG_WITH(exflags,
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AC_HELP_STRING([--with-exflags],
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[Specify flags necessary to enable C++ exceptions]),
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lam_force_exflags="$withval")
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lam_CXXFLAGS_SAVE="$CXXFLAGS"
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AC_MSG_CHECKING([for compiler exception flags])
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# See which flags to use
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if test "$lam_force_exflags" != ""; then
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# If the user supplied flags, use those
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lam_exflags="$lam_force_exflags"
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elif test "$GXX" = "yes"; then
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# g++ has changed their flags a few times. Sigh.
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CXXFLAGS="$CXXFLAGS -fexceptions"
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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2004-01-08 16:31:42 +03:00
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AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[]], [[try { int i = 0; } catch(...) { int j = 2; }]]), lam_happy=1, lam_happy=0)
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2004-01-07 18:34:40 +03:00
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if test "$lam_happy" = "1"; then
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lam_exflags="-fexceptions";
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else
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CXXFLAGS="$CXXFLAGS_SAVE -fhandle-exceptions"
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2004-01-08 16:31:42 +03:00
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AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[]], [[try { int i = 0; } catch(...) { int j = 2; }]]), lam_happy=1, lam_happy=0)
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2004-01-07 18:34:40 +03:00
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if test "$lam_happy" = "1"; then
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lam_exflags="-fhandle-exceptions";
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fi
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fi
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AC_LANG_RESTORE
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elif test "`basename $CXX`" = "KCC"; then
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# KCC flags
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lam_exflags="--exceptions"
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fi
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CXXFLAGS="$lam_CXXFLAGS_SAVE"
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# Save the result
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LAM_CXX_EXCEPTIONS_CXXFLAGS="$lam_exflags"
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LAM_CXX_EXCEPTIONS_LDFLAGS="$lam_exflags"
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if test "$lam_exflags" = ""; then
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AC_MSG_RESULT([none necessary])
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else
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AC_MSG_RESULT([$lam_exflags])
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fi
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# Clean up
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unset lam_force_exflags lam_CXXFLAGS_SAVE lam_exflags lam_happy])dnl
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