gnu: Add ClamAV.

* gnu/packages/antivirus.scm: New file.
* gnu/packages/patches/clamav-system-tomsfastmath.patch,
gnu/packages/patches/clamav-config-llvm-libs.patch: New files.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add new module.
(dist_patch_DATA): Add patches.

Co-authored-by: Christopher Baines <mail@cbaines.net>

2 files changed, 116 insertions, 0 deletions

diff --git a/gnu/packages/patches/clamav-config-llvm-libs.patch b/gnu/packages/patches/clamav-config-llvm-libs.patch
new file mode 100644
index 0000000000..054264ee2e
--- /dev/null
+++ b/gnu/packages/patches/clamav-config-llvm-libs.patch
@@ -0,0 +1,14 @@
+Our llvm does not contain a single top-level library, so consult llvm-config
+for the libraries that need to be linked against.
+
+--- clamav-0.100.2/libclamav/c++/configure.ac	2018-09-19 14:29:07.000000000 -0500
++++ clamav-0.100.2/libclamav/c++/configure.ac	2018-10-06 21:45:09.377249158 -0500
+@@ -105,7 +105,7 @@
+ 
+     if test "x$llvm_linking" = "xdynamic"; then
+         AC_SUBST(LLVMCONFIG_LDFLAGS, [`$llvmconfig --ldflags`])
+-        AC_SUBST(LLVMCONFIG_LIBS, [-lLLVM-$llvmver])
++        AC_SUBST(LLVMCONFIG_LIBS, [`$llvmconfig --libs $llvmcomp`])
+         AC_SUBST(LLVMCONFIG_LIBFILES, [])
+     else
+         if test $llvmver_test -ge 350; then
diff --git a/gnu/packages/patches/clamav-system-tomsfastmath.patch b/gnu/packages/patches/clamav-system-tomsfastmath.patch
new file mode 100644
index 0000000000..07ab79f3f7
--- /dev/null
+++ b/gnu/packages/patches/clamav-system-tomsfastmath.patch
@@ -0,0 +1,102 @@
+From 756ff89526b5ffaa7a4f49b1bbecf2ecbd6f85f9 Mon Sep 17 00:00:00 2001
+From: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
+Date: Wed, 11 Mar 2015 20:03:15 +0100
+Subject: add support for system tomsfastmath
+
+Patch-Name: add-support-for-system-tomsfastmath.patch
+---
+ configure.ac                           |    2 ++
+ libclamav/Makefile.am                  |   10 ++++++++--
+ libclamav/bignum.h                     |    6 +++++-
+ libclamav/xdp.c                        |    2 +-
+ m4/reorganization/libs/tomsfastmath.m4 |   12 ++++++++++++
+ 5 files changed, 28 insertions(+), 4 deletions(-)
+ create mode 100644 m4/reorganization/libs/tomsfastmath.m4
+
+--- a/configure.ac
++++ b/configure.ac
+@@ -82,6 +82,7 @@ m4_include([m4/reorganization/libs/xml.m
+ m4_include([m4/reorganization/libs/openssl.m4])
+ m4_include([m4/reorganization/libs/json.m4])
+ m4_include([m4/reorganization/libs/pcre.m4])
++m4_include([m4/reorganization/libs/tomsfastmath.m4])
+ 
+ AM_MAINTAINER_MODE
+ m4_include([m4/reorganization/libs/libz.m4])
+@@ -285,6 +286,7 @@ else
+ fi
+ CL_MSG_STATUS([yara        ],[$enable_yara],[$enable_yara])
+ CL_MSG_STATUS([fts         ],[yes],[$lfs_fts_msg])
++CL_MSG_STATUS([tomsfastmath],[yes],[$tomsfastmath_msg])
+ 
+ 
+ # Yep, downgrading the compiler avoids the bug too:
+--- a/libclamav/Makefile.am
++++ b/libclamav/Makefile.am
+@@ -496,8 +496,10 @@ libclamav_la_SOURCES += yara_arena.c \
+ 	yara_clam.h
+ endif
+ 
+-libclamav_la_SOURCES += bignum.h\
+-	bignum_fast.h\
++libclamav_la_SOURCES += bignum.h
++
++if !SYSTEM_TOMSFASTMATH
++libclamav_la_SOURCES += bignum_fast.h\
+         tomsfastmath/addsub/fp_add.c\
+         tomsfastmath/addsub/fp_add_d.c\
+         tomsfastmath/addsub/fp_addmod.c\
+@@ -579,6 +581,10 @@ libclamav_la_SOURCES += bignum.h\
+         tomsfastmath/sqr/fp_sqr_comba_generic.c\
+         tomsfastmath/sqr/fp_sqr_comba_small_set.c\
+ 	tomsfastmath/sqr/fp_sqrmod.c
++else
++libclamav_la_CFLAGS += $(TOMSFASTMATH_CFLAGS)
++libclamav_la_LIBADD += $(TOMSFASTMATH_LIBS)
++endif
+ 
+ .PHONY: version.h.tmp
+ version.c: version.h
+--- a/libclamav/bignum.h
++++ b/libclamav/bignum.h
+@@ -1,9 +1,13 @@
+ #ifndef BIGNUM_H_
+ #define BIGNUM_H_
+ 
++#if HAVE_SYSTEM_TOMSFASTMATH
++#include <tfm.h>
++#else
+ #define TFM_CHECK
+-
+ #include "bignum_fast.h"
++#endif
++
+ typedef fp_int mp_int;
+ #define mp_cmp fp_cmp
+ #define mp_toradix_n(a,b,c,d) fp_toradix_n(a,b,c,d)
+--- a/libclamav/xdp.c
++++ b/libclamav/xdp.c
+@@ -57,7 +57,7 @@
+ #include "scanners.h"
+ #include "conv.h"
+ #include "xdp.h"
+-#include "bignum_fast.h"
++#include "bignum.h"
+ #include "filetypes.h"
+ 
+ static char *dump_xdp(cli_ctx *ctx, const char *start, size_t sz);
+--- /dev/null
++++ b/m4/reorganization/libs/tomsfastmath.m4
+@@ -0,0 +1,12 @@
++dnl Check for system tomsfastmath
++PKG_CHECK_MODULES([TOMSFASTMATH], [tomsfastmath], [have_system_tomsfastmath=yes], [have_system_tomsfastmath=no])
++
++AM_CONDITIONAL([SYSTEM_TOMSFASTMATH], [test "x$have_system_tomsfastmath" = "xyes"])
++
++if test "x$have_system_tomsfastmath" = "xyes"; then
++    AC_DEFINE([HAVE_SYSTEM_TOMSFASTMATH], [1], [link against system-wide tomsfastmath library])
++    tomsfastmath_msg="External, $TOMSFASTMATH_CFLAGS $TOMSFASTMATH_LIBS"
++else
++    AC_DEFINE([HAVE_SYSTEM_TOMSFASTMATH], [0], [don't link against system-wide tomsfastmath library])
++    tomsfastmath_msg="Internal"
++fi