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a15dac42df
When testing compiler flags, we only need to do compile test. Otherwise, configure will fail with "configure: error: cannot run test program while cross compiling" when cross compiling. Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2191
28 lines
794 B
Plaintext
28 lines
794 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_ALWAYS_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_COMPILE_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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