squashfs-tools: Mark as incompatible with musl

Silently ignoring FNM_EXTMATCH makes fnmatch()
behave different from what callers expect.

Mark as incompatible with musl instead of risking
broken runtime behaviour.

The practical consequences should be small since
what is used in OE is mainly squashfs-tools-native.

(From OE-Core rev: c9aed6a84c0a33fee8a52603b22cc2b78928eb5f)

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/squashfs-tools/squashfs-tools/fix-compat.patch

@@ -1,39 +1,8 @@
-Define FNM_EXTMATCH if not defined its glibc specific define
 include missing sys/stat.h for stat* function declarations
 
 Upstream-Status: Pending
 Signed-off-by: Khem Raj <raj.khem@gmail.com>
 
-Index: squashfs-tools/action.c
-===================================================================
---- squashfs-tools.orig/action.c
-+++ squashfs-tools/action.c
-@@ -44,6 +44,10 @@
- #include "action.h"
- #include "error.h"
- 
-+#if !defined(FNM_EXTMATCH)
-+#define FNM_EXTMATCH 0
-+#endif
-+
- /*
-  * code to parse actions
-  */
-Index: squashfs-tools/mksquashfs.c
-===================================================================
---- squashfs-tools.orig/mksquashfs.c
-+++ squashfs-tools/mksquashfs.c
-@@ -1261,6 +1261,10 @@ void write_dir(squashfs_inode *inode, st
- 		dir_size + 3, directory_block, directory_offset, NULL, NULL,
- 		dir, 0);
- 
-+#if !defined(FNM_EXTMATCH)
-+#define FNM_EXTMATCH 0
-+#endif
-+
- #ifdef SQUASHFS_TRACE
- 	{
- 		unsigned char *dirp;
 Index: squashfs-tools/pseudo.c
 ===================================================================
 --- squashfs-tools.orig/pseudo.c
@@ -46,18 +15,3 @@ Index: squashfs-tools/pseudo.c
  #include <ctype.h>
  
  #include "pseudo.h"
-Index: squashfs-tools/unsquashfs.c
-===================================================================
---- squashfs-tools.orig/unsquashfs.c
-+++ squashfs-tools/unsquashfs.c
-@@ -42,6 +42,10 @@
- #include <sys/sysmacros.h>
- #endif
- 
-+#ifndef FNM_EXTMATCH
-+#define FNM_EXTMATCH 0
-+#endif
-+
- struct cache *fragment_cache, *data_cache;
- struct queue *to_reader, *to_inflate, *to_writer, *from_writer;
- pthread_t *thread, *inflator_thread;

meta/recipes-devtools/squashfs-tools/squashfs-tools_git.bb

@@ -19,6 +19,9 @@ SRC_URI[lzma.sha256sum] = "c935fd04dd8e0e8c688a3078f3675d699679a90be81c12686837e
 
 S = "${WORKDIR}/git/squashfs-tools"
 
+# needs FNM_EXTMATCH
+COMPATIBLE_HOST_libc-musl = 'null'
+
 EXTRA_OEMAKE = "${PACKAGECONFIG_CONFARGS}"
 
 PACKAGECONFIG ??= "gzip xz lzo lz4 lzma xattr"