gnu: Add go-1.16.

Add go@1.16 as a non-default go. Changes from 1.14: Use now-supported GO_LDSO
configuration option for setting the interpreter. Bootstrap with gccgo on
platforms which do not support go-1.4. Fix and re-enable cmd/go script tests.
Fix typo in cgoldflags patch. Break out tests into "check" phase. Remove
references to perl to reduce closure size by ~10%. Set GOCACHE so go doesn't
attempt to access $HOME.

* gnu/packages/patches/go-fix-script-tests.patch: New file.
* local.mk (dist_patch_DATA): Register it.
* gnu/packages/golang.scm (go-1.16): New variable. Use the patch.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/local.mk

@@ -1169,6 +1169,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/gobject-introspection-absolute-shlib-path.patch \
   %D%/packages/patches/gobject-introspection-cc.patch		\
   %D%/packages/patches/gobject-introspection-girepository.patch	\
+  %D%/packages/patches/go-fix-script-tests.patch			\
   %D%/packages/patches/go-skip-gc-test.patch			\
   %D%/packages/patches/gpm-glibc-2.26.patch			\
   %D%/packages/patches/gpodder-disable-updater.patch		\

gnu/packages/golang.scm

@@ -26,6 +26,7 @@
 ;;; Copyright © 2021 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2021 Guillaume Le Vaillant <glv@posteo.net>
 ;;; Copyright © 2021 Sharlatan Hellseher <sharlatanus@mgail.com>
+;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -45,6 +46,7 @@
 (define-module (gnu packages golang)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix utils)
+  #:use-module ((guix build utils) #:select (alist-replace))
   #:use-module (guix download)
   #:use-module (guix git-download)
   #:use-module (guix packages)
@@ -54,6 +56,7 @@ (define-module (gnu packages golang)
   #:use-module (gnu packages)
   #:use-module (gnu packages admin)
   #:use-module (gnu packages base)
+  #:use-module ((gnu packages bootstrap) #:select (glibc-dynamic-linker))
   #:use-module (gnu packages gcc)
   #:use-module (gnu packages glib)
   #:use-module (gnu packages lua)
@@ -441,6 +444,162 @@ (define-public go-1.14
        ,@(package-native-inputs go-1.4)))
     (supported-systems %supported-systems)))
 
+(define-public go-1.16
+  (package
+    (inherit go-1.14)
+    (name "go")
+    (version "1.16.5")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/golang/go")
+             (commit (string-append "go" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "19a93p217h5xi2sgh34qzv24pkd4df0sw4fc5z6k47lspjp3vx2l"))))
+    (arguments
+     (substitute-keyword-arguments (package-arguments go-1.14)
+       ((#:tests? _) #t)
+       ((#:phases phases)
+        `(modify-phases ,phases
+           (add-after 'unpack 'remove-unused-sourcecode-generators
+             (lambda _
+               ;; Prevent perl from inclusion in closure through unused files
+               (for-each delete-file (find-files "src" "\\.pl$"))))
+           (replace 'prebuild
+             (lambda* (#:key inputs outputs #:allow-other-keys)
+               (let* ((gcclib (string-append (assoc-ref inputs "gcc:lib") "/lib"))
+                      (net-base (assoc-ref inputs "net-base"))
+                      (tzdata-path
+                       (string-append (assoc-ref inputs "tzdata") "/share/zoneinfo")))
+
+                 ;; Having the patch in the 'patches' field of <origin> breaks
+                 ;; the 'TestServeContent' test due to the fact that
+                 ;; timestamps are reset.  Thus, apply it from here.
+                 (invoke "patch" "-p2" "--force" "-i"
+                         (assoc-ref inputs "go-skip-gc-test.patch"))
+                 (invoke "patch" "-p2" "--force" "-i"
+                         (assoc-ref inputs "go-fix-script-tests.patch"))
+
+                 (for-each make-file-writable (find-files "."))
+
+                 (substitute* "os/os_test.go"
+                   (("/usr/bin") (getcwd))
+                   (("/bin/sh") (which "sh")))
+
+                 (substitute* "cmd/go/testdata/script/cgo_path_space.txt"
+                   (("/bin/sh") (which "sh")))
+
+                 ;; Add libgcc to runpath
+                 (substitute* "cmd/link/internal/ld/lib.go"
+                   (("!rpath.set") "true"))
+                 (substitute* "cmd/go/internal/work/gccgo.go"
+                   (("cgoldflags := \\[\\]string\\{\\}")
+                    (string-append "cgoldflags := []string{"
+                                   "\"-Wl,-rpath=" gcclib "\""
+                                   "}"))
+                   (("\"-lgcc_s\", ")
+                    (string-append
+                     "\"-Wl,-rpath=" gcclib "\", \"-lgcc_s\", ")))
+                 (substitute* "cmd/go/internal/work/gc.go"
+                   (("ldflags = setextld\\(ldflags, compiler\\)")
+                    (string-append
+                     "ldflags = setextld(ldflags, compiler)\n"
+                     "ldflags = append(ldflags, \"-r\")\n"
+                     "ldflags = append(ldflags, \"" gcclib "\")\n")))
+
+                 ;; Disable failing tests: these tests attempt to access
+                 ;; commands or network resources which are neither available
+                 ;; nor necessary for the build to succeed.
+                 (for-each
+                  (match-lambda
+                    ((file regex)
+                     (substitute* file
+                       ((regex all before test_name)
+                        (string-append before "Disabled" test_name)))))
+                  '(("net/net_test.go" "(.+)(TestShutdownUnix.+)")
+                    ("net/dial_test.go" "(.+)(TestDialTimeout.+)")
+                    ("net/cgo_unix_test.go" "(.+)(TestCgoLookupPort.+)")
+                    ("net/cgo_unix_test.go" "(.+)(TestCgoLookupPortWithCancel.+)")
+                    ;; 127.0.0.1 doesn't exist
+                    ("net/cgo_unix_test.go" "(.+)(TestCgoLookupPTR.+)")
+                    ;; 127.0.0.1 doesn't exist
+                    ("net/cgo_unix_test.go" "(.+)(TestCgoLookupPTRWithCancel.+)")
+                    ;; /etc/services doesn't exist
+                    ("net/parse_test.go" "(.+)(TestReadLine.+)")
+                    ("os/os_test.go" "(.+)(TestHostname.+)")
+                    ;; The user's directory doesn't exist
+                    ("os/os_test.go" "(.+)(TestUserHomeDir.+)")
+                    ("time/format_test.go" "(.+)(TestParseInSydney.+)")
+                    ("time/format_test.go" "(.+)(TestParseInLocation.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestEcho.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestCommandRelativeName.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestCatStdin.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestCatGoodAndBadFile.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestExitStatus.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestPipes.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestStdinClose.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestIgnorePipeErrorOnSuccess.+)")
+                    ("syscall/syscall_unix_test.go" "(.+)(TestPassFD\\(.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestExtraFiles/areturn.+)")
+                    ("cmd/go/go_test.go" "(.+)(TestCoverageWithCgo.+)")
+                    ("cmd/go/go_test.go" "(.+)(TestTwoPkgConfigs.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestOutputStderrCapture.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestExtraFiles.+)")
+                    ("os/exec/exec_test.go" "(.+)(TestExtraFilesRace.+)")
+                    ("net/lookup_test.go" "(.+)(TestLookupPort.+)")
+                    ("syscall/exec_linux_test.go"
+                     "(.+)(TestCloneNEWUSERAndRemapNoRootDisableSetgroups.+)")))
+
+                 ;; These tests fail on aarch64-linux
+                 (substitute* "cmd/dist/test.go"
+                   (("t.registerHostTest\\(\"testsanitizers/msan.*") ""))
+
+                 ;; fix shebang for testar script
+                 ;; note the target script is generated at build time.
+                 (substitute* "../misc/cgo/testcarchive/carchive_test.go"
+                   (("#!/usr/bin/env") (string-append "#!" (which "env"))))
+
+                 (substitute* "net/lookup_unix.go"
+                   (("/etc/protocols") (string-append net-base "/etc/protocols")))
+                 (substitute* "net/port_unix.go"
+                   (("/etc/services") (string-append net-base "/etc/services")))
+                 (substitute* "time/zoneinfo_unix.go"
+                   (("/usr/share/zoneinfo/") tzdata-path)))))
+           (replace 'build
+             (lambda* (#:key inputs outputs #:allow-other-keys)
+               ;; FIXME: Some of the .a files are not bit-reproducible.
+               ;; (Is this still true?)
+               (let* ((output (assoc-ref outputs "out"))
+                      (loader (string-append (assoc-ref inputs "libc")
+                                             ,(glibc-dynamic-linker))))
+                 (setenv "CC" (which "gcc"))
+                 (setenv "GO_LDSO" loader)
+                 (setenv "GOOS" "linux")
+                 (setenv "GOROOT" (dirname (getcwd)))
+                 (setenv "GOROOT_FINAL" output)
+                 (setenv "GOCACHE" "/tmp/go-cache")
+                 (invoke "sh" "make.bash" "--no-banner"))))
+           (replace 'check
+             (lambda* (#:key target (tests? (not target)) (parallel-tests? #t)
+                       #:allow-other-keys)
+               (let* ((njobs (if parallel-tests? (parallel-job-count) 1)))
+                 (when tests?
+                   (setenv "GOMAXPROCS" (number->string njobs))
+                   (invoke "sh" "run.bash" "--no-rebuild")))))
+           (add-before 'install 'unpatch-perl-shebangs
+             (lambda _
+               ;; Rewrite references to perl input in test scripts
+               (substitute* "net/http/cgi/testdata/test.cgi"
+                 (("^#!.*") "#!/usr/bin/env perl\n"))))))))
+    (native-inputs
+     `(("go-fix-script-tests.patch" ,(search-patch "go-fix-script-tests.patch"))
+       ,@(if (not (member (%current-system) (package-supported-systems go-1.4)))
+             (alist-replace "go" (list gccgo-10) (package-native-inputs go-1.14))
+             (package-native-inputs go-1.14))))))
+
 (define-public go go-1.14)
 
 (define-public go-github-com-alsm-ioprogress

gnu/packages/patches/go-fix-script-tests.patch

@@ -0,0 +1,18 @@
+Make library/header paths visible to cmd/go script tests, which is necessary for
+cgo/gccgo tests to work correctly
+
+diff --git a/src/cmd/go/script_test.go b/src/cmd/go/script_test.go
+index dfaa40548e..9d0f0e9bcd 100644
+--- a/src/cmd/go/script_test.go
++++ b/src/cmd/go/script_test.go
+@@ -100,6 +100,10 @@ const (
+ var extraEnvKeys = []string{
+ 	"SYSTEMROOT",         // must be preserved on Windows to find DLLs; golang.org/issue/25210
+ 	"WINDIR",             // must be preserved on Windows to be able to run PowerShell command; golang.org/issue/30711
++	"CPATH",
++	"C_INCLUDE_PATH",
++	"CPLUS_INCLUDE_PATH",
++	"LIBRARY_PATH",
+ 	"LD_LIBRARY_PATH",    // must be preserved on Unix systems to find shared libraries
+ 	"CC",                 // don't lose user settings when invoking cgo
+ 	"GO_TESTING_GOTOOLS", // for gccgo testing