From fe2f5da4b0f8994169c53e84b7cb8a0feefc97b5 Mon Sep 17 00:00:00 2001 From: Sergei Trofimovich Date: Sun, 26 Jan 2020 18:35:13 +0000 Subject: [PATCH] squashfs-tools: fix build failure against gcc-10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On gcc-10 (and gcc-9 -fno-common) build fails as: ``` cc ... -o mksquashfs ld: read_fs.o:(.bss+0x0): multiple definition of `fwriter_buffer'; mksquashfs.o:(.bss+0x400c90): first defined here ld: read_fs.o:(.bss+0x8): multiple definition of `bwriter_buffer'; mksquashfs.o:(.bss+0x400c98): first defined here ``` gcc-10 will change the default from -fcommon to fno-common: https://gcc.gnu.org/PR85678. The error also happens if CFLAGS=-fno-common passed explicitly. Reported-by: Toralf Förster Bug: https://bugs.gentoo.org/706456 Signed-off-by: Sergei Trofimovich --- squashfs-tools/mksquashfs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/squashfs-tools/mksquashfs.h +++ b/squashfs-tools/mksquashfs.h @@ -133,7 +133,7 @@ struct append_file { #define BLOCK_OFFSET 2 extern struct cache *reader_buffer, *fragment_buffer, *reserve_cache; -struct cache *bwriter_buffer, *fwriter_buffer; +extern struct cache *bwriter_buffer, *fwriter_buffer; extern struct queue *to_reader, *to_deflate, *to_writer, *from_writer, *locked_fragment, *to_process_frag; extern struct append_file **file_mapping;