[Buildroot] [git commit] squashfs: fix build with gcc 7

[Thomas Petazzoni]

commit: https://git.buildroot.net/buildroot/commit/?id=f308e4420fde3d14d00f8d44f8ca376b232f57cb
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

gcc 7 with -Os (optimize for size) takes the liberty to remove the code of
inline function entirely. This leads to undefined function references at link
time. Restore gcc original inline behaviour to fix this issue.

Fixes:
http://autobuild.buildroot.net/results/3c5/3c5b1d799dce3ba361d618330c242bf4eba76019/
http://autobuild.buildroot.net/results/09f/09f350b62e2486404b78222dce211400bb233000/
http://autobuild.buildroot.net/results/693/693960ed7c01622c756dcc929e83b3b713c16ccc/

Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
Signed-off-by: Baruch Siach <baruch at tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 package/squashfs/squashfs.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/squashfs/squashfs.mk b/package/squashfs/squashfs.mk
index db3f276..9599d89 100644
--- a/package/squashfs/squashfs.mk
+++ b/package/squashfs/squashfs.mk
@@ -59,7 +59,7 @@ HOST_SQUASHFS_MAKE_ARGS = \
 define SQUASHFS_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) \
 		CC="$(TARGET_CC)" \
-		EXTRA_CFLAGS="$(TARGET_CFLAGS)" \
+		EXTRA_CFLAGS="$(TARGET_CFLAGS) -fgnu89-inline" \
 		EXTRA_LDFLAGS="$(TARGET_LDFLAGS)" \
 		$(SQUASHFS_MAKE_ARGS) \
 		-C $(@D)/squashfs-tools/