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Check for -Wno-unused-but-set-variable gcc support

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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's 12c1acde76 and
79713039a2 for the reason the
-Wno-unused-but-set-variable options was originally added.
This commit is contained in:
Brian Behlendorf
2011-06-14 11:02:13 -07:00
parent 10715a0187
commit 8a7e1ceefa
57 changed files with 326 additions and 35 deletions
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config/kernel.m4
+1 -1
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@@ -46,7 +46,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
dnl # compiler options are added by the kernel build system.
KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-unused-but-set-variable"
KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""