32 lines
871 B
Plaintext
32 lines
871 B
Plaintext
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dnl HAVE_WARN_EFFECTIVE_CXX
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dnl ----------------------
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dnl
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dnl If the C++ compiler accepts the `-Weffc++' flag,
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dnl set output variable `WARN_EFFECTIVE_CXX' to `-Weffc++' and
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dnl `WARN_NO_EFFECTIVE_CXX' to `-Wno-effc++'. Otherwise,
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dnl leave both empty.
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dnl
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AC_DEFUN([HAVE_WARN_EFFECTIVE_CXX],
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[
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AC_REQUIRE([AC_PROG_CXX])
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AC_MSG_CHECKING([whether the C++ compiler (${CXX}) accepts -Weffc++])
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AC_CACHE_VAL([cv_warn_effective_cxx],
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[
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AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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save_cxxflags="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS -Weffc++"
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AC_TRY_COMPILE([],[main();],
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[cv_warn_effective_cxx=yes], [cv_warn_effective_cxx=no])
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CXXFLAGS="$save_cxxflags"
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AC_LANG_RESTORE
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])
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AC_MSG_RESULT([$cv_warn_effective_cxx])
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if test "$cv_warn_effective_cxx" = yes; then
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WARN_EFFECTIVE_CXX=-Weffc++
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WARN_NO_EFFECTIVE_CXX=-Wno-effc++
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fi
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AC_SUBST([WARN_EFFECTIVE_CXX])
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AC_SUBST([WARN_NO_EFFECTIVE_CXX])
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])
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