gmp: Bring back version 4.2.1 (LGPL 2.1+)

gmp 4.2.1 was removed in f181c6ce8b apparently accidentally: It
was not noticed that 4.2.1 is LGPL 2.1 (and not GPL) so provides
a useful alternative to the newer "GPLv2 | LGPLv3" version.

* Reintroduce 4.2.1. The source includes files that are GPL but the
  library package is LGPL 2.1+
* Also reintroduce the two patches removed in f181c6ce8b.
* Refactor gmp.inc: gmp 6.0.0 build should not be affected in any way.
* Update 6.0.0 license from "GPLv2 | LGPLv3" to "GPLv2+ | LGPLv3+".

[YOCTO #8197]

(From OE-Core rev: 1adec83621f36a3dd748990c307ca4ebebcdd554)

Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/meta/recipes-support/gmp/gmp-4.2.1/disable-stdc.patch b/meta/recipes-support/gmp/gmp-4.2.1/disable-stdc.patch
new file mode 100644
index 0000000000..5decb1cec5
--- /dev/null
+++ b/meta/recipes-support/gmp/gmp-4.2.1/disable-stdc.patch
@@ -0,0 +1,39 @@
+This patch was removed in f181c6ce8b3 when gmp 4.2.1 was mistakenly
+dropped.
+
+Upstream is not interested in patches for ancient versions.
+
+Upstream-Status: Inappropriate
+Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
+
+# "extern inline" in traditional gcc means that the function should be 
+# inlined wherever it's seen, while in C99, "extern inline" means that i
+# the function should only be inlined where the inline definition is 
+# seen while in other places it's not inlined:
+# http://gcc.gnu.org/ml/gcc/2006-11/msg00006.html
+#
+# gmp checks "--std=gnu99" to use C99 convention however it internally 
+# defines some "extern inline" functions in gmp.h, which is included
+# by mainly .c files and finally lead a flood of redefinition function
+# errors when linking objects together.
+#
+# So disable C99/ANSI detection to stick to tranditional gcc behavior
+#
+# by Kevin Tian <kevin.tian@intel.com>, 2010-08-13
+#
+# (this patch is licensed under GPLv2+)
+
+diff --git a/configure.in b/configure.in
+index 450cc92..aab0b59 100644
+--- a/configure.in
++++ b/configure.in
+@@ -1869,9 +1869,7 @@ AC_SUBST(DEFN_LONG_LONG_LIMB)
+ 
+ # The C compiler and preprocessor, put into ANSI mode if possible.
+ AC_PROG_CC
+-AC_PROG_CC_STDC
+ AC_PROG_CPP
+-GMP_H_ANSI
+ 
+ 
+ # The C compiler on the build system, and associated tests.