libgo: change build procedure to use build tags
Previously the libgo Makefile explicitly listed the set of files to
compile for each package. For packages that use build tags, this
required a lot of awkward automake conditionals in the Makefile.
This CL changes the build to look at the build tags in the files.
The new shell script libgo/match.sh does the matching. This required
adjusting a lot of build tags, and removing some files that are never
used. I verified that the exact same sets of files are compiled on
amd64 GNU/Linux. I also tested the build on i386 Solaris.
Writing match.sh revealed some bugs in the build tag handling that
already exists, in a slightly different form, in the gotest shell
script. This CL fixes those problems as well.
The old code used automake conditionals to handle systems that were
missing strerror_r and wait4. Rather than deal with those in Go, those
functions are now implemented in runtime/go-nosys.c when necessary, so
the Go code can simply assume that they exist.
The os testsuite looked for dir_unix.go, which was never built for gccgo
and has now been removed. I changed the testsuite to look for dir.go
instead.
Reviewed-on: https://go-review.googlesource.com/25546
From-SVN: r239189
diff --git a/libgo/match.sh b/libgo/match.sh
new file mode 100755
index 0000000..e415acd
--- /dev/null
+++ b/libgo/match.sh
@@ -0,0 +1,197 @@
+#!/bin/sh
+
+# Copyright 2016 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+# Given a source directory, returns the non-test Go files that should
+# be built for this target. This implements Go's build constraints in
+# a shell script. There is similar code in testsuite/gotest.
+
+set -e
+
+unset LANG
+LC_ALL=C
+LC_CTYPE=C
+export LC_ALL LC_CTYPE
+
+srcdir=""
+goarch=""
+goos=""
+extrafiles=""
+cmdlinetag="nosuchtag"
+cgotag="cgo"
+
+for arg; do
+ case "x$arg" in
+ x--srcdir)
+ srcdir=$2
+ shift
+ shift
+ ;;
+ x--srcdir=*)
+ srcdir=`echo $1 | sed -e 's/^--srcdir=//'`
+ shift
+ ;;
+ x--goarch)
+ goarch=$2
+ shift
+ shift
+ ;;
+ x--goarch=*)
+ goarch=`echo $1 | sed -e 's/^--goarch=//'`
+ shift
+ ;;
+ x--goos)
+ goos=$2
+ shift
+ shift
+ ;;
+ x--goos=*)
+ goos=`echo $1 | sed -e 's/^--goos=//'`
+ shift
+ ;;
+ x--extrafiles)
+ extrafiles=$2
+ shift
+ shift
+ ;;
+ x--extrafiles=*)
+ extrafiles=`echo $1 | sed -e 's/^--extrafiles=//'`
+ shift
+ ;;
+ x--tag)
+ cmdlinetag=$2
+ shift
+ shift
+ ;;
+ x--tag=*)
+ cmdlinetag=`echo $1 | sed -e 's/^--tag=//'`
+ shift
+ ;;
+ x--nocgo)
+ cgotag="nosuchtag"
+ shift
+ ;;
+ *)
+ echo 1>&2 "unknown argument $arg"
+ exit 1
+ ;;
+ esac
+done
+
+cd $srcdir
+
+gofiles=
+for f in *.go; do
+ case $f in
+ *_test.go)
+ ;;
+ *.go)
+ gofiles="$gofiles $f"
+ ;;
+ esac
+done
+
+if test "$gofiles" = ""; then
+ echo 1>&2 "no non-test .go files in $srcdir"
+ exit 1
+fi
+
+matched=
+for f in $gofiles; do
+ tag1=`echo $f | sed -e 's/^.*_\([^_]*\).go$/\1/'`
+ tag2=`echo $f | sed -e 's/^.*_\([^_]*\)_[^_]*.go$/\1/'`
+ if test x$tag1 = x$f; then
+ tag1=
+ fi
+ if test x$tag2 = x$f; then
+ tag2=
+ fi
+
+ case "$tag1" in
+ "") ;;
+ $goarch) ;;
+ $goos) ;;
+ android | darwin | dragonfly | freebsd | linux | nacl | netbsd | openbsd | plan9 | solaris | windows)
+ tag1=nonmatchingtag
+ ;;
+ 386 | amd64 | amd64p32 | arm | armbe | arm64 | arm64be | alpha | m68k | ppc64 | ppc64le | mips | mipsle | mips64 | mips64le | mips64p32 | mips64p32le | mipso32 | mipsn32 | mipsn64 | mipso64 | ppc | s390 | s390x | sparc | sparc64)
+ tag1=nonmatchingtag
+ ;;
+ esac
+
+ case "$tag2" in
+ "") ;;
+ $goarch) ;;
+ $goos) ;;
+ android | darwin | dragonfly | freebsd | linux | nacl | netbsd | openbsd | plan9 | solaris | windows)
+ tag2=nonmatchingtag
+ ;;
+ 386 | amd64 | amd64p32 | arm | armbe | arm64 | arm64be | alpha | m68k | ppc64 | ppc64le | mips | mipsle | mips64 | mips64le | mips64p32 | mips64p32le | mipso32 | mipsn32 | mipsn64 | mipso64 | ppc | s390 | s390x | sparc | sparc64)
+ tag2=nonmatchingtag
+ ;;
+ esac
+
+ if test x$tag1 != xnonmatchingtag -a x$tag2 != xnonmatchingtag; then
+ # Pipe through cat so that `set -e` doesn't affect fgrep.
+ tags=`sed '/^package /q' < $f | grep '^// +build ' | cat`
+ omatch=true
+ first=true
+ match=false
+ for tag in $tags; do
+ case $tag in
+ "//")
+ ;;
+ "+build")
+ if test "$first" = "true"; then
+ first=false
+ elif test "$match" = "false"; then
+ omatch=false
+ fi
+ match=false
+ ;;
+ $goos | $goarch | $cgotag | $cmdlinetag)
+ match=true
+ ;;
+ "!"$goos | "!"$goarch | "!"$cgotag | "!"$cmdlinetag)
+ ;;
+ *,*)
+ cmatch=true
+ for ctag in `echo $tag | sed -e 's/,/ /g'`; do
+ case $ctag in
+ $goos | $goarch | $cgotag | $cmdlinetag)
+ ;;
+ "!"$goos | "!"$goarch | "!"$cgotag | "!"$cmdlinetag)
+ cmatch=false
+ ;;
+ "!"*)
+ ;;
+ *)
+ cmatch=false
+ ;;
+ esac
+ done
+ if test "$cmatch" = "true"; then
+ match=true
+ fi
+ ;;
+ "!"*)
+ match=true
+ ;;
+ esac
+ done
+
+ if test "$match" = "false" -a "$first" = "false"; then
+ omatch=false
+ fi
+
+ if test "$omatch" = "true"; then
+ matched="$matched $srcdir/$f"
+ fi
+ fi
+done
+
+echo $matched $extrafiles
+
+exit 0