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8a7e1ceefa
Gcc versions 4.3.2 and earlier do not support the compiler flag -Wno-unused-but-set-variable. This can lead to build failures on older Linux platforms such as Debian Lenny. Since this is an optional build argument this changes add a new autoconf check for the option. If it is supported by the installed version of gcc then it is used otherwise it is omited. See commit's12c1acde76and79713039a2for the reason the -Wno-unused-but-set-variable options was originally added.
28 lines
787 B
Plaintext
28 lines
787 B
Plaintext
dnl #
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dnl # Check if gcc supports -Wno-unused-but-set-variable option.
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dnl #
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dnl # We actually invoke gcc with the -Wunused-but-set-variable option
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dnl # and infer the 'no-' version does or doesn't exist based upon
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dnl # the results. This is required because when checking any of
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dnl # no- prefixed options gcc always returns success.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_USER_NO_UNUSED_BUT_SET_VARIABLE], [
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AC_MSG_CHECKING([for -Wno-unused-but-set-variable support])
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saved_flags="$CFLAGS"
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CFLAGS="$CFLAGS -Wunused-but-set-variable"
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AC_RUN_IFELSE(AC_LANG_PROGRAM( [], []),
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[
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NO_UNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
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AC_MSG_RESULT([yes])
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],
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[
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NO_UNUSED_BUT_SET_VARIABLE=
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AC_MSG_RESULT([no])
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])
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CFLAGS="$saved_flags"
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AC_SUBST([NO_UNUSED_BUT_SET_VARIABLE])
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])
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