22 lines
561 B
Plaintext
22 lines
561 B
Plaintext
dnl
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dnl JH_ADD_CFLAG(FLAG)
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dnl checks whether the C compiler supports the given flag, and if so, adds
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dnl it to $CFLAGS. If the flag is already present in the list, then the
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dnl check is not performed.
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AC_DEFUN([JH_ADD_CFLAG],
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[
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case " $CFLAGS " in
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*@<:@\ \ @:>@$1@<:@\ \ @:>@*)
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;;
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*)
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save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $1"
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AC_MSG_CHECKING([whether [$]CC understands $1])
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AC_TRY_COMPILE([], [], [jh_has_option=yes], [jh_has_option=no])
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AC_MSG_RESULT($jh_has_option)
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if test $jh_has_option = no; then
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CFLAGS="$save_CFLAGS"
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fi
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;;
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esac])
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