gnu: Add libtommath.

* gnu/packages/multiprecision.scm (libtommath): New variable.
* gnu/packages/patches/libtommath.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu/local.mk

@@ -993,6 +993,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/libssh2-fix-build-failure-with-gcrypt.patch	\
   %D%/packages/patches/libtar-CVE-2013-4420.patch 		\
   %D%/packages/patches/libtheora-config-guess.patch		\
+  %D%/packages/patches/libtommath-fix-linkage.patch		\
   %D%/packages/patches/libtool-skip-tests2.patch		\
   %D%/packages/patches/libusb-0.1-disable-tests.patch		\
   %D%/packages/patches/libusb-for-axoloti.patch			\

gnu/packages/multiprecision.scm

@@ -6,7 +6,7 @@
 ;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2018, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018 Eric Bavier <bavier@member.fsf.org>
-;;; Copyright © 2018 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2018, 2019 Efraim Flashner <efraim@flashner.co.il>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -290,3 +290,59 @@ (define-public tomsfastmath
 ISO C.  It is a port of LibTomMath with optional support for inline assembler
 multiplies.")
     (license public-domain)))
+
+(define-public libtommath
+  (package
+    (name "libtommath")
+    (version "1.1.0")
+    (outputs '("out" "static"))
+    (source
+      (origin
+        (method url-fetch)
+        (uri (string-append "https://github.com/libtom/libtommath/releases/"
+                            "download/v" version "/ltm-" version ".tar.xz"))
+        (sha256
+         (base32
+          "1bbyagqzfdbg37k1n08nsqzdf44z8zsnjjinqbsyj7rxg246qilh"))
+        (patches (search-patches "libtommath-fix-linkage.patch"))))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:phases
+       (modify-phases %standard-phases
+         (delete 'configure) ; no configure
+         (add-after 'unpack 'prepare-build
+           (lambda _
+             ;; Don't pull in coreutils.
+             (substitute* "makefile_include.mk"
+               (("arch") "uname -m"))
+
+             ;; We want the shared library by default so force it to be the
+             ;; default makefile target.
+             (delete-file "makefile")
+             (symlink "makefile.shared" "makefile")
+             #t))
+         (add-after 'install 'remove-static-library
+           (lambda* (#:key outputs #:allow-other-keys)
+             (delete-file (string-append (assoc-ref outputs "out")
+                                         "/lib/libtommath.a"))
+             #t))
+         (replace 'check
+           (lambda* (#:key make-flags #:allow-other-keys)
+             (apply invoke "make" "test_standalone" make-flags)
+             (invoke "sh" "test")))
+         (add-after 'install 'install-static-library
+           (lambda* (#:key outputs #:allow-other-keys)
+             (invoke "make" "-f" "makefile.unix" "install"
+                     (string-append "PREFIX=" (assoc-ref outputs "static"))
+                     (string-append "CC=" (which "gcc"))))))
+       #:make-flags (list (string-append "PREFIX=" (assoc-ref %outputs "out"))
+                          "CC=gcc")))
+    (native-inputs
+     `(("libtool" ,libtool)))
+    (home-page "https://www.libtom.net/LibTomMath/")
+    (synopsis "Portable number theoretic multiple-precision integer library")
+    (description "LibTomMath is a portable number theoretic multiple-precision
+integer library written entirely in C.  It's designed to provide an API that is
+simple to work with that provides fairly efficient routines that build out of
+the box without configuration.")
+    (license unlicense)))

gnu/packages/patches/libtommath-fix-linkage.patch

@@ -0,0 +1,55 @@
+https://github.com/libtom/libtommath/commit/93dea3a4162527346cd8856bfda6f17ffe98ab04.patch
+
+From 93dea3a4162527346cd8856bfda6f17ffe98ab04 Mon Sep 17 00:00:00 2001
+From: Steffen Jaeckel <s@jaeckel.eu>
+Date: Thu, 31 Jan 2019 14:12:03 +0100
+Subject: [PATCH] makefile.shared: fix compilation and linkage
+
+---
+ makefile.shared | 15 ++++++++-------
+ 1 file changed, 8 insertions(+), 7 deletions(-)
+
+diff --git a/makefile.shared b/makefile.shared
+index 3955f830..870b18d1 100644
+--- a/makefile.shared
++++ b/makefile.shared
+@@ -18,6 +18,7 @@ ifndef LIBTOOL
+   endif
+ endif
+ LTCOMPILE = $(LIBTOOL) --mode=compile --tag=CC $(CC)
++LTLINK = $(LIBTOOL) --mode=link --tag=CC $(CC)
+ 
+ LCOV_ARGS=--directory .libs --directory .
+ 
+@@ -59,7 +60,7 @@ objs: $(OBJECTS)
+ LOBJECTS = $(OBJECTS:.o=.lo)
+ 
+ $(LIBNAME):  $(OBJECTS)
+-	$(LIBTOOL) --mode=link --tag=CC $(CC) $(LDFLAGS) $(LOBJECTS) -o $(LIBNAME) -rpath $(LIBPATH) -version-info $(VERSION_SO) $(LIBTOOLFLAGS)
++	$(LTLINK) $(LDFLAGS) $(LOBJECTS) -o $(LIBNAME) -rpath $(LIBPATH) -version-info $(VERSION_SO) $(LIBTOOLFLAGS)
+ 
+ install: $(LIBNAME)
+ 	install -d $(DESTDIR)$(LIBPATH)
+@@ -76,16 +77,16 @@ uninstall:
+ 	rm $(DESTDIR)$(LIBPATH)/pkgconfig/libtommath.pc
+ 
+ test: $(LIBNAME) demo/demo.o
+-	$(CC) $(CFLAGS) -c demo/demo.c -o demo/demo.o
+-	$(LIBTOOL) --mode=link $(CC) $(LDFLAGS) -o test demo/demo.o $(LIBNAME)
++	$(LTCOMPILE) $(CFLAGS) -c demo/demo.c -o demo/demo.o
++	$(LTLINK) $(LDFLAGS) -o test demo/demo.o $(LIBNAME)
+ 
+ test_standalone: $(LIBNAME) demo/demo.o
+-	$(CC) $(CFLAGS) -c demo/demo.c -o demo/demo.o
+-	$(LIBTOOL) --mode=link $(CC) $(LDFLAGS) -o test demo/demo.o $(LIBNAME)
++	$(LTCOMPILE) $(CFLAGS) -c demo/demo.c -o demo/demo.o
++	$(LTLINK) $(LDFLAGS) -o test demo/demo.o $(LIBNAME)
+ 
+ .PHONY: mtest
+ mtest:
+-	cd mtest ; $(CC) $(CFLAGS) $(LDFLAGS) mtest.c -o mtest
++	cd mtest ; $(CC) $(CFLAGS) -O0 mtest.c $(LDFLAGS) -o mtest
+ 
+ timing: $(LIBNAME) demo/timing.c
+-	$(LIBTOOL) --mode=link $(CC) $(CFLAGS) $(LDFLAGS) -DTIMER demo/timing.c $(LIBNAME) -o timing
++	$(LTLINK) $(CFLAGS) $(LDFLAGS) -DTIMER demo/timing.c $(LIBNAME) -o timing