go: Add recipes for golang compilers and tools

* This is converging the recipes for go from
  meta-virtualization and oe-meta-go

* Add recipes for go 1.7

* go.bbclass is added to ease out writing
  recipes for go packages

* go-examples: Add an example, helloworld written in go
  This should serve as temlate for writing go recipes

* Disable for musl, at least for now

* Disable for x32/ppc32 which is not supported

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

4 files changed, 344 insertions, 0 deletions

diff --git a/meta/recipes-devtools/go/go-1.4/0001-cmd-ld-set-alignment-for-the-.rel.plt-section-on-32-.patch b/meta/recipes-devtools/go/go-1.4/0001-cmd-ld-set-alignment-for-the-.rel.plt-section-on-32-.patch
new file mode 100644
index 0000000000..f2adc200b1
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.4/0001-cmd-ld-set-alignment-for-the-.rel.plt-section-on-32-.patch
@@ -0,0 +1,33 @@
+From 855145d5c03c4b4faf60736c38d7a299c682af4a Mon Sep 17 00:00:00 2001
+From: Shenghou Ma <minux@golang.org>
+Date: Sat, 7 Feb 2015 14:06:02 -0500
+Subject: [PATCH] cmd/ld: set alignment for the .rel.plt section on 32-bit
+ architectures
+
+Fixes #9802.
+
+Change-Id: I22c52a37bdb23a14cc4615c9519431bb14ca81ca
+Reviewed-on: https://go-review.googlesource.com/4170
+Reviewed-by: Ian Lance Taylor <iant@golang.org>
+---
+Upstream-Status: Backport
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+ src/cmd/ld/elf.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/cmd/ld/elf.c b/src/cmd/ld/elf.c
+index 12ced98..97ed4bd 100644
+--- a/src/cmd/ld/elf.c
++++ b/src/cmd/ld/elf.c
+@@ -1363,6 +1363,7 @@ asmbelf(vlong symo)
+ 			sh->type = SHT_REL;
+ 			sh->flags = SHF_ALLOC;
+ 			sh->entsize = ELF32RELSIZE;
++			sh->addralign = 4;
+ 			sh->link = elfshname(".dynsym")->shnum;
+ 			shsym(sh, linklookup(ctxt, ".rel.plt", 0));
+ 
+-- 
+1.9.1
+
diff --git a/meta/recipes-devtools/go/go-1.4/016-armhf-elf-header.patch b/meta/recipes-devtools/go/go-1.4/016-armhf-elf-header.patch
new file mode 100644
index 0000000000..e6e414e52f
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.4/016-armhf-elf-header.patch
@@ -0,0 +1,24 @@
+Description: Use correct ELF header for armhf binaries.
+Author: Adam Conrad <adconrad@ubuntu.com>
+Last-Update: 2013-07-08
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+Index: go/src/cmd/ld/elf.c
+===================================================================
+--- go.orig/src/cmd/ld/elf.c	2015-02-20 10:49:58.763451586 -0800
++++ go/src/cmd/ld/elf.c	2015-02-20 10:49:27.895478521 -0800
+@@ -57,7 +57,11 @@
+ 	case '5':
+ 		// we use EABI on both linux/arm and freebsd/arm.
+ 		if(HEADTYPE == Hlinux || HEADTYPE == Hfreebsd)
+-			hdr.flags = 0x5000002; // has entry point, Version5 EABI
++#ifdef __ARM_PCS_VFP
++			hdr.flags = 0x5000402; // has entry point, Version5 EABI, hard-float ABI
++#else
++			hdr.flags = 0x5000202; // has entry point, Version5 EABI, soft-float ABI
++#endif
+ 		// fallthrough
+ 	default:
+ 		hdr.phoff = ELF32HDRSIZE;	/* Must be be ELF32HDRSIZE: first PHdr must follow ELF header */
diff --git a/meta/recipes-devtools/go/go-1.4/go-cross-backport-cmd-link-support-new-386-amd64-rel.patch b/meta/recipes-devtools/go/go-1.4/go-cross-backport-cmd-link-support-new-386-amd64-rel.patch
new file mode 100644
index 0000000000..95ca9d3aa9
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.4/go-cross-backport-cmd-link-support-new-386-amd64-rel.patch
@@ -0,0 +1,225 @@
+From d6eefad445831c161fca130f9bdf7b3848aac23c Mon Sep 17 00:00:00 2001
+From: Paul Gortmaker <paul.gortmaker@windriver.com>
+Date: Tue, 29 Mar 2016 21:14:33 -0400
+Subject: [PATCH] go-cross: backport "cmd/link: support new 386/amd64
+ relocations"
+
+Newer binutils won't support building older go-1.4.3 as per:
+
+https://github.com/golang/go/issues/13114
+
+Upstream commit 914db9f060b1fd3eb1f74d48f3bd46a73d4ae9c7 (see subj)
+was identified as the fix and nominated for 1.4.4 but that release
+never happened.  The paths in 1.4.3 aren't the same as go1.6beta1~662
+where this commit appeared, but the NetBSD folks indicated what a
+1.4.3 backport would look like here: https://gnats.netbsd.org/50777
+
+This is based on that, but without the BSD wrapper infrastructure
+layer that makes things look like patches of patches.
+
+Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
+
+Upstream-Status: Backport [ Partial ]
+
+diff --git a/src/cmd/6l/asm.c b/src/cmd/6l/asm.c
+index 18b5aa311981..2e9d339aef87 100644
+--- a/src/cmd/6l/asm.c
++++ b/src/cmd/6l/asm.c
+@@ -118,6 +118,8 @@ adddynrel(LSym *s, Reloc *r)
+ 		return;
+ 	
+ 	case 256 + R_X86_64_GOTPCREL:
++	case 256 + R_X86_64_GOTPCRELX:
++	case 256 + R_X86_64_REX_GOTPCRELX:
+ 		if(targ->type != SDYNIMPORT) {
+ 			// have symbol
+ 			if(r->off >= 2 && s->p[r->off-2] == 0x8b) {
+diff --git a/src/cmd/8l/asm.c b/src/cmd/8l/asm.c
+index 98c04240374f..cff29488e8af 100644
+--- a/src/cmd/8l/asm.c
++++ b/src/cmd/8l/asm.c
+@@ -115,6 +115,7 @@ adddynrel(LSym *s, Reloc *r)
+ 		return;		
+ 	
+ 	case 256 + R_386_GOT32:
++	case 256 + R_386_GOT32X:
+ 		if(targ->type != SDYNIMPORT) {
+ 			// have symbol
+ 			if(r->off >= 2 && s->p[r->off-2] == 0x8b) {
+diff --git a/src/cmd/ld/elf.h b/src/cmd/ld/elf.h
+index e84d996f2596..bbf2cfaa3cc0 100644
+--- a/src/cmd/ld/elf.h
++++ b/src/cmd/ld/elf.h
+@@ -478,32 +478,47 @@ typedef struct {
+  * Relocation types.
+  */
+ 
+-#define	R_X86_64_NONE	0	/* No relocation. */
+-#define	R_X86_64_64	1	/* Add 64 bit symbol value. */
+-#define	R_X86_64_PC32	2	/* PC-relative 32 bit signed sym value. */
+-#define	R_X86_64_GOT32	3	/* PC-relative 32 bit GOT offset. */
+-#define	R_X86_64_PLT32	4	/* PC-relative 32 bit PLT offset. */
+-#define	R_X86_64_COPY	5	/* Copy data from shared object. */
+-#define	R_X86_64_GLOB_DAT 6	/* Set GOT entry to data address. */
+-#define	R_X86_64_JMP_SLOT 7	/* Set GOT entry to code address. */
+-#define	R_X86_64_RELATIVE 8	/* Add load address of shared object. */
+-#define	R_X86_64_GOTPCREL 9	/* Add 32 bit signed pcrel offset to GOT. */
+-#define	R_X86_64_32	10	/* Add 32 bit zero extended symbol value */
+-#define	R_X86_64_32S	11	/* Add 32 bit sign extended symbol value */
+-#define	R_X86_64_16	12	/* Add 16 bit zero extended symbol value */
+-#define	R_X86_64_PC16	13	/* Add 16 bit signed extended pc relative symbol value */
+-#define	R_X86_64_8	14	/* Add 8 bit zero extended symbol value */
+-#define	R_X86_64_PC8	15	/* Add 8 bit signed extended pc relative symbol value */
+-#define	R_X86_64_DTPMOD64 16	/* ID of module containing symbol */
+-#define	R_X86_64_DTPOFF64 17	/* Offset in TLS block */
+-#define	R_X86_64_TPOFF64 18	/* Offset in static TLS block */
+-#define	R_X86_64_TLSGD	19	/* PC relative offset to GD GOT entry */
+-#define	R_X86_64_TLSLD	20	/* PC relative offset to LD GOT entry */
+-#define	R_X86_64_DTPOFF32 21	/* Offset in TLS block */
+-#define	R_X86_64_GOTTPOFF 22	/* PC relative offset to IE GOT entry */
+-#define	R_X86_64_TPOFF32 23	/* Offset in static TLS block */
+-
+-#define	R_X86_64_COUNT	24	/* Count of defined relocation types. */
++#define	R_X86_64_NONE           0
++#define	R_X86_64_64             1
++#define	R_X86_64_PC32           2
++#define	R_X86_64_GOT32          3
++#define	R_X86_64_PLT32          4
++#define	R_X86_64_COPY           5
++#define	R_X86_64_GLOB_DAT       6
++#define	R_X86_64_JMP_SLOT       7
++#define	R_X86_64_RELATIVE       8
++#define	R_X86_64_GOTPCREL       9
++#define	R_X86_64_32             10
++#define	R_X86_64_32S            11
++#define	R_X86_64_16             12
++#define	R_X86_64_PC16           13
++#define	R_X86_64_8              14
++#define	R_X86_64_PC8            15
++#define	R_X86_64_DTPMOD64       16
++#define	R_X86_64_DTPOFF64       17
++#define	R_X86_64_TPOFF64        18
++#define	R_X86_64_TLSGD          19
++#define	R_X86_64_TLSLD          20
++#define	R_X86_64_DTPOFF32       21
++#define	R_X86_64_GOTTPOFF       22
++#define	R_X86_64_TPOFF32        23
++#define	R_X86_64_PC64           24
++#define	R_X86_64_GOTOFF64       25
++#define	R_X86_64_GOTPC32        26
++#define	R_X86_64_GOT64          27
++#define	R_X86_64_GOTPCREL64     28
++#define	R_X86_64_GOTPC64        29
++#define	R_X86_64_GOTPLT64       30
++#define	R_X86_64_PLTOFF64       31
++#define	R_X86_64_SIZE32         32
++#define	R_X86_64_SIZE64         33
++#define	R_X86_64_GOTPC32_TLSDEC 34
++#define	R_X86_64_TLSDESC_CALL   35
++#define	R_X86_64_TLSDESC        36
++#define	R_X86_64_IRELATIVE      37
++#define	R_X86_64_PC32_BND       40
++#define	R_X86_64_GOTPCRELX      41
++#define	R_X86_64_REX_GOTPCRELX  42
+ 
+ 
+ #define	R_ALPHA_NONE		0	/* No reloc */
+@@ -581,39 +596,42 @@ typedef struct {
+ #define	R_ARM_COUNT		38	/* Count of defined relocation types. */
+ 
+ 
+-#define	R_386_NONE	0	/* No relocation. */
+-#define	R_386_32	1	/* Add symbol value. */
+-#define	R_386_PC32	2	/* Add PC-relative symbol value. */
+-#define	R_386_GOT32	3	/* Add PC-relative GOT offset. */
+-#define	R_386_PLT32	4	/* Add PC-relative PLT offset. */
+-#define	R_386_COPY	5	/* Copy data from shared object. */
+-#define	R_386_GLOB_DAT	6	/* Set GOT entry to data address. */
+-#define	R_386_JMP_SLOT	7	/* Set GOT entry to code address. */
+-#define	R_386_RELATIVE	8	/* Add load address of shared object. */
+-#define	R_386_GOTOFF	9	/* Add GOT-relative symbol address. */
+-#define	R_386_GOTPC	10	/* Add PC-relative GOT table address. */
+-#define	R_386_TLS_TPOFF	14	/* Negative offset in static TLS block */
+-#define	R_386_TLS_IE	15	/* Absolute address of GOT for -ve static TLS */
+-#define	R_386_TLS_GOTIE	16	/* GOT entry for negative static TLS block */
+-#define	R_386_TLS_LE	17	/* Negative offset relative to static TLS */
+-#define	R_386_TLS_GD	18	/* 32 bit offset to GOT (index,off) pair */
+-#define	R_386_TLS_LDM	19	/* 32 bit offset to GOT (index,zero) pair */
+-#define	R_386_TLS_GD_32	24	/* 32 bit offset to GOT (index,off) pair */
+-#define	R_386_TLS_GD_PUSH 25	/* pushl instruction for Sun ABI GD sequence */
+-#define	R_386_TLS_GD_CALL 26	/* call instruction for Sun ABI GD sequence */
+-#define	R_386_TLS_GD_POP 27	/* popl instruction for Sun ABI GD sequence */
+-#define	R_386_TLS_LDM_32 28	/* 32 bit offset to GOT (index,zero) pair */
+-#define	R_386_TLS_LDM_PUSH 29	/* pushl instruction for Sun ABI LD sequence */
+-#define	R_386_TLS_LDM_CALL 30	/* call instruction for Sun ABI LD sequence */
+-#define	R_386_TLS_LDM_POP 31	/* popl instruction for Sun ABI LD sequence */
+-#define	R_386_TLS_LDO_32 32	/* 32 bit offset from start of TLS block */
+-#define	R_386_TLS_IE_32	33	/* 32 bit offset to GOT static TLS offset entry */
+-#define	R_386_TLS_LE_32	34	/* 32 bit offset within static TLS block */
+-#define	R_386_TLS_DTPMOD32 35	/* GOT entry containing TLS index */
+-#define	R_386_TLS_DTPOFF32 36	/* GOT entry containing TLS offset */
+-#define	R_386_TLS_TPOFF32 37	/* GOT entry of -ve static TLS offset */
+-
+-#define	R_386_COUNT	38	/* Count of defined relocation types. */
++#define	R_386_NONE          0
++#define	R_386_32            1
++#define	R_386_PC32          2
++#define	R_386_GOT32         3
++#define	R_386_PLT32         4
++#define	R_386_COPY          5
++#define	R_386_GLOB_DAT      6
++#define	R_386_JMP_SLOT      7
++#define	R_386_RELATIVE      8
++#define	R_386_GOTOFF        9
++#define	R_386_GOTPC         10
++#define	R_386_TLS_TPOFF     14
++#define	R_386_TLS_IE        15
++#define	R_386_TLS_GOTIE     16
++#define	R_386_TLS_LE        17
++#define	R_386_TLS_GD        18
++#define	R_386_TLS_LDM       19
++#define	R_386_TLS_GD_32     24
++#define	R_386_TLS_GD_PUSH   25
++#define	R_386_TLS_GD_CALL   26
++#define	R_386_TLS_GD_POP    27
++#define	R_386_TLS_LDM_32    28
++#define	R_386_TLS_LDM_PUSH  29
++#define	R_386_TLS_LDM_CALL  30
++#define	R_386_TLS_LDM_POP   31
++#define	R_386_TLS_LDO_32    32
++#define	R_386_TLS_IE_32     33
++#define	R_386_TLS_LE_32     34
++#define	R_386_TLS_DTPMOD32  35
++#define	R_386_TLS_DTPOFF32  36
++#define	R_386_TLS_TPOFF32   37
++#define	R_386_TLS_GOTDESC   39
++#define	R_386_TLS_DESC_CALL 40
++#define	R_386_TLS_DESC      41
++#define	R_386_IRELATIVE     42
++#define	R_386_GOT32X        43
+ 
+ #define	R_PPC_NONE		0	/* No relocation. */
+ #define	R_PPC_ADDR32		1
+diff --git a/src/cmd/ld/ldelf.c b/src/cmd/ld/ldelf.c
+index dd5fa0d2a839..2e2fbd17377f 100644
+--- a/src/cmd/ld/ldelf.c
++++ b/src/cmd/ld/ldelf.c
+@@ -888,12 +888,15 @@ reltype(char *pn, int elftype, uchar *siz)
+ 	case R('6', R_X86_64_PC32):
+ 	case R('6', R_X86_64_PLT32):
+ 	case R('6', R_X86_64_GOTPCREL):
++	case R('6', R_X86_64_GOTPCRELX):
++	case R('6', R_X86_64_REX_GOTPCRELX):
+ 	case R('8', R_386_32):
+ 	case R('8', R_386_PC32):
+ 	case R('8', R_386_GOT32):
+ 	case R('8', R_386_PLT32):
+ 	case R('8', R_386_GOTOFF):
+ 	case R('8', R_386_GOTPC):
++	case R('8', R_386_GOT32X):
+ 		*siz = 4;
+ 		break;
+ 	case R('6', R_X86_64_64):
+-- 
+2.7.2
+
diff --git a/meta/recipes-devtools/go/go-1.4/syslog.patch b/meta/recipes-devtools/go/go-1.4/syslog.patch
new file mode 100644
index 0000000000..29be06f1bd
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.4/syslog.patch
@@ -0,0 +1,62 @@
+Add timeouts to logger
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
+
+diff -r -u go/src/log/syslog/syslog.go /home/achang/GOCOPY/go/src/log/syslog/syslog.go
+--- go/src/log/syslog/syslog.go	2013-11-28 13:38:28.000000000 -0800
++++ /home/achang/GOCOPY/go/src/log/syslog/syslog.go	2014-10-03 11:44:37.710403200 -0700
+@@ -33,6 +33,9 @@
+ const severityMask = 0x07
+ const facilityMask = 0xf8
+ 
++var writeTimeout = 1 * time.Second
++var connectTimeout = 1 * time.Second
++
+ const (
+ 	// Severity.
+ 
+@@ -100,6 +103,7 @@
+ type serverConn interface {
+ 	writeString(p Priority, hostname, tag, s, nl string) error
+ 	close() error
++	setWriteDeadline(t time.Time) error
+ }
+ 
+ type netConn struct {
+@@ -273,7 +277,11 @@
+ 		nl = "\n"
+ 	}
+ 
+-	err := w.conn.writeString(p, w.hostname, w.tag, msg, nl)
++	err := w.conn.setWriteDeadline(time.Now().Add(writeTimeout))
++	if err != nil {
++		return 0, err
++	}
++	err = w.conn.writeString(p, w.hostname, w.tag, msg, nl)
+ 	if err != nil {
+ 		return 0, err
+ 	}
+@@ -305,6 +313,10 @@
+ 	return n.conn.Close()
+ }
+ 
++func (n *netConn) setWriteDeadline(t time.Time) error {
++	return n.conn.SetWriteDeadline(t)
++}
++
+ // NewLogger creates a log.Logger whose output is written to
+ // the system log service with the specified priority. The logFlag
+ // argument is the flag set passed through to log.New to create
+diff -r -u go/src/log/syslog/syslog_unix.go /home/achang/GOCOPY/go/src/log/syslog/syslog_unix.go
+--- go/src/log/syslog/syslog_unix.go	2013-11-28 13:38:28.000000000 -0800
++++ /home/achang/GOCOPY/go/src/log/syslog/syslog_unix.go	2014-10-03 11:44:39.010403175 -0700
+@@ -19,7 +19,7 @@
+ 	logPaths := []string{"/dev/log", "/var/run/syslog"}
+ 	for _, network := range logTypes {
+ 		for _, path := range logPaths {
+-			conn, err := net.Dial(network, path)
++			conn, err := net.DialTimeout(network, path, connectTimeout)
+ 			if err != nil {
+ 				continue
+ 			} else {