[PATCH nft 1/2] libnftables: drop gmp_init() and mp_set_memory_functions()

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Setting global handles for libgmp via mp_set_memory_functions() is very
ugly. When we don't use mini-gmp, then potentially there are other users
of the library in the same process, and every process fighting about the
allocation functions is not gonna work.

It also means, we must not reset the allocation functions after somebody
already allocated GMP data with them. Which we cannot ensure, as we
don't know what other parts of the process are doing.

It's also unnecessary. The default allocation functions for gmp and
mini-gmp already abort the process on allocation failure ([1], [2]),
just like our xmalloc().

Just don't do this.

[1] https://gmplib.org/repo/gmp/file/8225bdfc499f/memory.c#l37
[2] https://git.netfilter.org/nftables/tree/src/mini-gmp.c?id=6d19a902c1d77cb51b940b1ce65f31b1cad38b74#n286

Signed-off-by: Thomas Haller <thaller@xxxxxxxxxx>
 include/nftables.h |  1 -
 src/gmputil.c      | 10 ----------
 src/libnftables.c  |  1 -
 3 files changed, 12 deletions(-)

diff --git a/include/nftables.h b/include/nftables.h
index b9b2b01c2689..4b7c335928da 100644
--- a/include/nftables.h
+++ b/include/nftables.h
@@ -224,7 +224,6 @@ struct input_descriptor {
 void ct_label_table_init(struct nft_ctx *ctx);
 void mark_table_init(struct nft_ctx *ctx);
-void gmp_init(void);
 void realm_table_rt_init(struct nft_ctx *ctx);
 void devgroup_table_init(struct nft_ctx *ctx);
 void xt_init(void);
diff --git a/src/gmputil.c b/src/gmputil.c
index 7f65630db59c..bf472c65de48 100644
--- a/src/gmputil.c
+++ b/src/gmputil.c
@@ -197,13 +197,3 @@ int mpz_vfprintf(FILE *fp, const char *f, va_list args)
 	return n;
-static void *gmp_xrealloc(void *ptr, size_t old_size, size_t new_size)
-	return xrealloc(ptr, new_size);
-void gmp_init(void)
-	mp_set_memory_functions(xmalloc, gmp_xrealloc, NULL);
diff --git a/src/libnftables.c b/src/libnftables.c
index c5f5729409d1..c34ee43de1fa 100644
--- a/src/libnftables.c
+++ b/src/libnftables.c
@@ -196,7 +196,6 @@ struct nft_ctx *nft_ctx_new(uint32_t flags)
 	if (!init_once) {
 		init_once = true;
-		gmp_init();

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