util-linux: fix crc32 function collision

When linking both zlib and libblkid statically in the same target a
collision occurs. Fix this by prefixing publicly-visible crc32 library
functions. Fixes:

http://autobuild.buildroot.net/results/25e/25efb79dd6ff1d93b5775baeccda23194d68c711/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 182 insertions, 0 deletions

diff --git a/package/util-linux/0001-lib-crc32-prefix-public-functions.patch b/package/util-linux/0001-lib-crc32-prefix-public-functions.patch
new file mode 100644
index 000000000..fa68bd01e
--- /dev/null
+++ b/package/util-linux/0001-lib-crc32-prefix-public-functions.patch
@@ -0,0 +1,182 @@
+From b39b4cac29dcc5d060d8e30344f693462502066a Mon Sep 17 00:00:00 2001
+From: Gustavo Zacarias <gustavo@zacarias.com.ar>
+Date: Mon, 10 Oct 2016 17:42:42 -0300
+Subject: [PATCH] lib/crc32: prefix public functions
+
+Make the publicly-visible crc32 library functions prefixed by ul_, such
+as crc32() -> ul_crc32().
+This is because it clashes with the crc32() function from zlib.
+For newer versions of glib (2.50+) zlib and libblkid are required
+dependencies and otherwise results in build failure when building
+statically.
+
+Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
+---
+Status: submitted upstream
+
+ disk-utils/fsck.cramfs.c         | 12 ++++++------
+ disk-utils/mkfs.cramfs.c         |  6 +++---
+ include/crc32.h                  |  4 ++--
+ lib/crc32.c                      |  4 ++--
+ libblkid/src/partitions/gpt.c    |  2 +-
+ libblkid/src/superblocks/nilfs.c |  6 +++---
+ libfdisk/src/gpt.c               |  2 +-
+ 7 files changed, 18 insertions(+), 18 deletions(-)
+
+diff --git a/disk-utils/fsck.cramfs.c b/disk-utils/fsck.cramfs.c
+index 12009f2..f34e79f 100644
+--- a/disk-utils/fsck.cramfs.c
++++ b/disk-utils/fsck.cramfs.c
+@@ -214,7 +214,7 @@ static void test_crc(int start)
+ 		return;
+ 	}
+ 
+-	crc = crc32(0L, Z_NULL, 0);
++	crc = ul_crc32(0L, Z_NULL, 0);
+ 
+ 	buf =
+ 	    mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+@@ -231,8 +231,8 @@ static void test_crc(int start)
+ 	}
+ 	if (buf != MAP_FAILED) {
+ 		((struct cramfs_super *)((unsigned char *) buf + start))->fsid.crc =
+-		    crc32(0L, Z_NULL, 0);
+-		crc = crc32(crc, (unsigned char *) buf + start, super.size - start);
++		    ul_crc32(0L, Z_NULL, 0);
++		crc = ul_crc32(crc, (unsigned char *) buf + start, super.size - start);
+ 		munmap(buf, super.size);
+ 	} else {
+ 		int retval;
+@@ -249,15 +249,15 @@ static void test_crc(int start)
+ 				break;
+ 			if (length == 0)
+ 				((struct cramfs_super *)buf)->fsid.crc =
+-				    crc32(0L, Z_NULL, 0);
++				    ul_crc32(0L, Z_NULL, 0);
+ 			length += retval;
+ 			if (length > (super.size - start)) {
+-				crc = crc32(crc, buf,
++				crc = ul_crc32(crc, buf,
+ 					  retval - (length -
+ 						    (super.size - start)));
+ 				break;
+ 			}
+-			crc = crc32(crc, buf, retval);
++			crc = ul_crc32(crc, buf, retval);
+ 		}
+ 		free(buf);
+ 	}
+diff --git a/disk-utils/mkfs.cramfs.c b/disk-utils/mkfs.cramfs.c
+index 4e6b3ab..55d6871 100644
+--- a/disk-utils/mkfs.cramfs.c
++++ b/disk-utils/mkfs.cramfs.c
+@@ -406,7 +406,7 @@ static unsigned int write_superblock(struct entry *root, char *base, int size)
+ 	super->size = size;
+ 	memcpy(super->signature, CRAMFS_SIGNATURE, sizeof(super->signature));
+ 
+-	super->fsid.crc = crc32(0L, Z_NULL, 0);
++	super->fsid.crc = ul_crc32(0L, Z_NULL, 0);
+ 	super->fsid.edition = opt_edition;
+ 	super->fsid.blocks = total_blocks;
+ 	super->fsid.files = total_nodes;
+@@ -700,7 +700,7 @@ int main(int argc, char **argv)
+ 	loff_t fslen_ub = sizeof(struct cramfs_super);
+ 	unsigned int fslen_max;
+ 	char const *dirname, *outfile;
+-	uint32_t crc = crc32(0L, Z_NULL, 0);
++	uint32_t crc = ul_crc32(0L, Z_NULL, 0);
+ 	int c;
+ 	cramfs_is_big_endian = HOST_IS_BIG_ENDIAN; /* default is to use host order */
+ 
+@@ -856,7 +856,7 @@ int main(int argc, char **argv)
+ 		       sizeof(struct cramfs_super));
+ 
+ 	/* Put the checksum in. */
+-	crc = crc32(crc, (unsigned char *) (rom_image+opt_pad), (offset-opt_pad));
++	crc = ul_crc32(crc, (unsigned char *) (rom_image+opt_pad), (offset-opt_pad));
+ 	((struct cramfs_super *) (rom_image+opt_pad))->fsid.crc = u32_toggle_endianness(cramfs_is_big_endian, crc);
+ 	if (verbose)
+ 		printf(_("CRC: %x\n"), crc);
+diff --git a/include/crc32.h b/include/crc32.h
+index ff2dd99..2551f50 100644
+--- a/include/crc32.h
++++ b/include/crc32.h
+@@ -4,8 +4,8 @@
+ #include <sys/types.h>
+ #include <stdint.h>
+ 
+-extern uint32_t crc32(uint32_t seed, const unsigned char *buf, size_t len);
+-extern uint32_t crc32_exclude_offset(uint32_t seed, const unsigned char *buf, size_t len,
++extern uint32_t ul_crc32(uint32_t seed, const unsigned char *buf, size_t len);
++extern uint32_t ul_crc32_exclude_offset(uint32_t seed, const unsigned char *buf, size_t len,
+ 		                              size_t exclude_off, size_t exclude_len);
+ 
+ #endif
+diff --git a/lib/crc32.c b/lib/crc32.c
+index a5e3216..824693d 100644
+--- a/lib/crc32.c
++++ b/lib/crc32.c
+@@ -108,7 +108,7 @@ static inline uint32_t crc32_add_char(uint32_t crc, unsigned char c)
+  * and does __not__ xor at the end. Then individual users can do
+  * whatever they need.
+  */
+-uint32_t crc32(uint32_t seed, const unsigned char *buf, size_t len)
++uint32_t ul_crc32(uint32_t seed, const unsigned char *buf, size_t len)
+ {
+ 	uint32_t crc = seed;
+ 	const unsigned char *p = buf;
+@@ -121,7 +121,7 @@ uint32_t crc32(uint32_t seed, const unsigned char *buf, size_t len)
+ 	return crc;
+ }
+ 
+-uint32_t crc32_exclude_offset(uint32_t seed, const unsigned char *buf, size_t len,
++uint32_t ul_crc32_exclude_offset(uint32_t seed, const unsigned char *buf, size_t len,
+ 			      size_t exclude_off, size_t exclude_len)
+ {
+ 	uint32_t crc = seed;
+diff --git a/libblkid/src/partitions/gpt.c b/libblkid/src/partitions/gpt.c
+index dcc04e6..e6baa59 100644
+--- a/libblkid/src/partitions/gpt.c
++++ b/libblkid/src/partitions/gpt.c
+@@ -105,7 +105,7 @@ struct gpt_entry {
+ static inline uint32_t count_crc32(const unsigned char *buf, size_t len,
+ 				   size_t exclude_off, size_t exclude_len)
+ {
+-	return (crc32_exclude_offset(~0L, buf, len, exclude_off, exclude_len) ^ ~0L);
++	return (ul_crc32_exclude_offset(~0L, buf, len, exclude_off, exclude_len) ^ ~0L);
+ }
+ 
+ static inline unsigned char *get_lba_buffer(blkid_probe pr,
+diff --git a/libblkid/src/superblocks/nilfs.c b/libblkid/src/superblocks/nilfs.c
+index ee5c5f9..95538ef 100644
+--- a/libblkid/src/superblocks/nilfs.c
++++ b/libblkid/src/superblocks/nilfs.c
+@@ -89,9 +89,9 @@ static int nilfs_valid_sb(blkid_probe pr, struct nilfs_super_block *sb, int is_b
+ 	if (bytes < crc_start || bytes > sizeof(struct nilfs_super_block))
+ 		return 0;
+ 
+-	crc = crc32(le32_to_cpu(sb->s_crc_seed), (unsigned char *)sb, sumoff);
+-	crc = crc32(crc, sum, 4);
+-	crc = crc32(crc, (unsigned char *)sb + crc_start, bytes - crc_start);
++	crc = ul_crc32(le32_to_cpu(sb->s_crc_seed), (unsigned char *)sb, sumoff);
++	crc = ul_crc32(crc, sum, 4);
++	crc = ul_crc32(crc, (unsigned char *)sb + crc_start, bytes - crc_start);
+ 
+ 	return blkid_probe_verify_csum(pr, crc, le32_to_cpu(sb->s_sum));
+ }
+diff --git a/libfdisk/src/gpt.c b/libfdisk/src/gpt.c
+index 8377192..208699b 100644
+--- a/libfdisk/src/gpt.c
++++ b/libfdisk/src/gpt.c
+@@ -850,7 +850,7 @@ fail:
+ static inline uint32_t count_crc32(const unsigned char *buf, size_t len,
+ 				   size_t ex_off, size_t ex_len)
+ {
+-	return (crc32_exclude_offset(~0L, buf, len, ex_off, ex_len) ^ ~0L);
++	return (ul_crc32_exclude_offset(~0L, buf, len, ex_off, ex_len) ^ ~0L);
+ }
+ 
+ static inline uint32_t gpt_header_count_crc32(struct gpt_header *header)
+-- 
+2.7.3
+