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btrfs-progs: build: do not use AC_DEFINE twice for a FIEMAP define

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Autoheader uses the AC_DEFINE macros (and a few others) to populate
the config.h.in file. The autotools documentation does not tell
what happens if AC_DEFINE is used twice for the same identifier.

This patch prevents using AC_DEFINE twice for
HAVE_OWN_FIEMAP_EXTENT_DEFINE, preserving the logic (using the
fact that an undefined identifier in a preprocessor directive is
taken as zero).

Signed-off-by: Pierre Labastie <pierre.labastie@neuf.fr>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Pierre Labastie 2021-03-20 10:27:28 +01:00 committed by David Sterba
parent 2f9736d051
commit b9f7f3f428
1 changed files with 2 additions and 8 deletions
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10
configure.ac
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@ -240,17 +240,11 @@ fi
AC_SUBST([CRYPTOPROVIDER_BUILTIN])
AC_DEFINE_UNQUOTED([CRYPTOPROVIDER],["$cryptoprovider"],[Crypto implementation source name])
HAVE_OWN_FIEMAP_EXTENT_SHARED_DEFINE=0
AX_CHECK_DEFINE([linux/fiemap.h], [FIEMAP_EXTENT_SHARED], [],
[HAVE_OWN_FIEMAP_EXTENT_SHARED_DEFINE=1
[AC_DEFINE([HAVE_OWN_FIEMAP_EXTENT_SHARED_DEFINE], [1],
[Define to 1 if kernel headers do not define FIEMAP_EXTENT_SHARED])
AC_MSG_WARN([no definition of FIEMAP_EXTENT_SHARED found, probably old kernel, will use own definition, 'btrfs fi du' might report wrong numbers])])
if test "x$HAVE_OWN_FIEMAP_EXTENT_SHARED_DEFINE" == "x1"; then
AC_DEFINE([HAVE_OWN_FIEMAP_EXTENT_SHARED_DEFINE], [1], [We defined FIEMAP_EXTENT_SHARED])
else
AC_DEFINE([HAVE_OWN_FIEMAP_EXTENT_SHARED_DEFINE], [0], [We did not define FIEMAP_EXTENT_SHARED])
fi
AX_CHECK_DEFINE([ext2fs/ext2_fs.h], [EXT4_EPOCH_MASK],
[AC_DEFINE([HAVE_EXT4_EPOCH_MASK_DEFINE], [1],
[Define to 1 if e2fsprogs defines EXT4_EPOCH_MASK])],