Go packages use build tags (see the section on Build Constraints at https://golang.org/pkg/go/build/) to select which files to build on specific systems.
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 patch 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 x86_64-pc-linux-gnu. I also tested the build on i386-sun-solaris (building for both 32-bit and 64-bit). 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 patch 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. Note that if you have an existing build directory, you will have to remove all the .dep files in TARGET/libgo after updating to this patch. There isn't anything that will force them to update automatically. Bootstrapped on x86_64-pc-linux-gnu and i386-sun-solaris. Ran Go testsuite on x86_64-pc-linux-gnu. Committed to mainline. Ian
patch.txt.bz2
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