tst_libext2fs: Avoid multiple definition of global variables

gcc version 10 changed the default from -fcommon to -fno-common and as a
result e2fsprogs make check tests fail because tst_libext2fs.c end up
with a build error.

This is because it defines two global variables debug_prog_name and
extra_cmds that are already defined in debugfs/debugfs.c. With -fcommon
linker was able to resolve those into the same object, however with
-fno-common it's no longer able to do it and we end up with multiple
definition errors.

Fix the problem by using SKIP_GLOBDEFS macro to skip the variables
definition in debugfs.c. Note that debug_prog_name is also defined in
lib/ext2fs/extent.c when DEBUG macro is used, but this does not work even
with older gcc versions and is never used regardless so I am not going to
bother with it.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
index 755ec80..e33c92e 100644 (file)
--- a/debugfs/debugfs.c
+++ b/debugfs/debugfs.c
@@ -48,8 +48,14 @@ extern char *optarg;
 int journal_enable_debug = -1;
 #endif
 
+/*
+ * There must be only one definition if we're hooking in extra commands or
+ * chaging default prompt. Use -DSKIP_GLOBDEF for that.
+ */
+#ifndef SKIP_GLOBDEFS
 ss_request_table *extra_cmds;
 const char *debug_prog_name;
+#endif
 int ss_sci_idx;
 
 ext2_filsys    current_fs;

diff --git a/debugfs/debugfs.h b/debugfs/debugfs.h
index 477d9bb..956517b 100644 (file)
--- a/debugfs/debugfs.h
+++ b/debugfs/debugfs.h
@@ -123,6 +123,8 @@ extern void do_set_block_group_descriptor(int argc, char **, int sci_idx, void *
 extern void do_dump_unused(int argc, char **argv, int sci_idx, void *infop);
 
 /* debugfs.c */
+extern ss_request_table *extra_cmds;
+extern const char *debug_prog_name;
 extern void internal_dump_inode(FILE *, const char *, ext2_ino_t,
                                struct ext2_inode *, int);
 

diff --git a/lib/ext2fs/Makefile.in b/lib/ext2fs/Makefile.in
index c2163bf..f754b95 100644 (file)
--- a/lib/ext2fs/Makefile.in
+++ b/lib/ext2fs/Makefile.in
@@ -377,7 +377,7 @@ extent_cmds.c extent_cmds.h: $(top_srcdir)/debugfs/extent_cmds.ct
 
 debugfs.o: $(top_srcdir)/debugfs/debugfs.c
        $(E) "  CC $<"
-       $(Q) $(CC) $(DEBUGFS_CFLAGS) -c $< -o $@
+       $(Q) $(CC) $(DEBUGFS_CFLAGS) -DSKIP_GLOBDEFS -c $< -o $@
 
 extent_inode.o: $(top_srcdir)/debugfs/extent_inode.c
        $(E) "  CC $<"