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go/misc/cgo/test
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Russ Cox 06ad3b2de1 cmd/cgo: stop using compiler error message text to analyze C names 
The old approach to determining whether "name" was a type, constant,
or expression was to compile the C program

        name;

and scan the errors and warnings generated by the compiler.
This requires looking for specific substrings in the errors and warnings,
which ties the implementation to specific compiler versions.
As compilers change their errors or drop warnings, cgo breaks.
This happens slowly but it does happen.
Clang in particular (now required on OS X) has a significant churn rate.

The new approach compiles a slightly more complex program
that is either valid C or not valid C depending on what kind of
thing "name" is. It uses only the presence or absence of an error
message on a particular line, not the error text itself. The program is:

        // error if and only if name is undeclared
        void f1(void) { typeof(name) *x; }

        // error if and only if name is not a type
        void f2(void) { name *x; }

        // error if and only if name is not an integer constant
        void f3(void) { enum { x = (name)*1 }; }

I had not been planning to do this until Go 1.3, because it is a
non-trivial change, but it fixes a real Xcode 5 problem in Go 1.2,
and the new code is easier to understand than the old code.
It should be significantly more robust.

Fixes #6596.
Fixes #6612.

R=golang-dev, r, james, iant
CC=golang-dev
https://golang.org/cl/15070043
2013-10-18 15:56:25 -04:00
..
backdoor misc/cgo/test: changes to pass when using gccgo 2012-11-01 13:54:09 -07:00
align.go test: Add the usual Copyright notice. 2012-01-24 14:48:15 -05:00
api.go misc/cgo/test: check API compatibility for cgo pseudo-functions 2013-05-30 02:59:57 +08:00
basic.go cgo: enable cgo on openbsd 2012-12-21 01:43:19 +11:00
callback_c_gc.c misc/cgo/test: fix C panic test to work with gccgo 2013-10-11 11:24:54 -07:00
callback_c_gccgo.c misc/cgo/test: fix C panic test to work with gccgo 2013-10-11 11:24:54 -07:00
callback_c.c misc/cgo/test: fix C panic test to work with gccgo 2013-10-11 11:24:54 -07:00
callback.go runtime/cgo: mark callback functions as NOSPLIT 2013-10-09 08:44:47 -07:00
cflags.go cmd/cgo, cmd/go: remove #cgo directive parsing from cmd/cgo 2013-04-10 21:41:54 -07:00
cgo_linux_test.go misc/cgo/test: only run setgid test on GNU/Linux 2012-07-28 10:40:51 -07:00
cgo_test.go cmd/cgo: stop using compiler error message text to analyze C names 2013-10-18 15:56:25 -04:00
cthread_unix.c cgo: enable cgo on dragonfly 2013-09-04 15:19:21 -07:00
cthread_windows.c runtime: allow cgo callbacks on non-Go threads 2013-02-20 17:48:23 -05:00
cthread.go runtime: fix stack pointer corruption in runtime.cgocallback_gofunc() 2013-04-30 04:13:32 +08:00
duplicate_symbol.go cgo: omit duplicate symbols in writeDefs 2011-08-16 14:56:23 -04:00
env.go misc/cgo/test: make tests run on windows 2012-01-20 12:59:44 +11:00
exports.go cgo: add missing semicolon in generated struct 2011-07-18 07:23:52 -07:00
fpvar.go cmd/cgo: Add support for C function pointers 2013-08-13 12:42:21 -04:00
helpers.go cgo: fix incorrect print found by govet 2011-11-29 14:40:34 +11:00
issue1222.go runtime: scheduler, cgo reorganization 2011-03-07 10:37:42 -05:00
issue1328.go misc/cgo: re-enable some tests 2012-03-06 23:27:30 -05:00
issue1560.go misc/cgo/test: deflake TestParallelSleep once more 2013-05-18 02:55:44 +08:00
issue1635.go cmd/ld: handle a special case of scattered relocation 2/1 on Darwin/386 2012-08-29 23:42:05 +08:00
issue2462.go cgo: support export for built-in types 2011-12-20 09:28:45 -08:00
issue3250.go misc/cgo/test: skip test for issue 3250, the runtime isn't ready yet. 2013-07-15 14:37:36 +08:00
issue3250w.go runtime: correctly handle signals received on foreign threads 2013-07-12 04:39:39 +08:00
issue3261.go cmd/go: new cgo build procedure 2012-08-17 03:42:34 +08:00
issue3729.go cmd/cgo: access errno from void C function 2012-12-18 00:26:08 +08:00
issue3729w.go cmd/cgo: access errno from void C function 2012-12-18 00:26:08 +08:00
issue3741.go cmd/cgo: generate definitions for GoSlice 2012-06-30 12:40:07 +08:00
issue3775.go misc/cgo/test: test recursive internal OS thread lock 2013-07-23 14:43:55 -04:00
issue3945.go runtime: increase stack frame during cgo call on windows/amd64 2012-09-03 12:12:51 +10:00
issue4029.go misc/cgo/test: do not stop on first error 2013-03-06 15:03:28 -05:00
issue4029w.go misc/cgo/test: add -ldl to LDFLAGS on Linux, ignore issue4029 on windows (fix build) 2012-10-10 01:30:34 +08:00
issue4054a.go cgo: process DWARF info even when debug data is used for value 2012-09-20 13:20:33 +10:00
issue4054b.go cgo: process DWARF info even when debug data is used for value 2012-09-20 13:20:33 +10:00
issue4273.c cmd/ld: handle weak symbols 2012-10-30 23:58:43 +08:00
issue4273b.c cmd/ld: handle weak symbols 2012-10-30 23:58:43 +08:00
issue4339.c misc/cgo/test: test of issue 4339 2013-09-11 09:56:38 -04:00
issue4339.go misc/cgo/test: test of issue 4339 2013-09-11 09:56:38 -04:00
issue4339.h misc/cgo/test: test of issue 4339 2013-09-11 09:56:38 -04:00
issue4417.go cmd/cgo: access errno from void C function 2012-12-18 00:26:08 +08:00
issue4857.go cmd/cgo: using __typeof__(a->r) instead of putting invalid TYPE in "a->r = (const TYPE)" 2013-06-02 22:46:53 +08:00
issue5227.go misc/cgo/test: fix a gcc warning 2013-04-18 02:33:55 +08:00
issue5337.go misc/cgo/test: make test work with -linkmode=internal 2013-07-11 23:24:35 -04:00
issue5337w.go misc/cgo/test: add missing import 2013-05-15 15:34:47 +10:00
issue5548_c.c cmd/cgo: use intgo, not int, for string and slice structures 2013-05-23 22:51:07 -07:00
issue5548.go cmd/cgo: use intgo, not int, for string and slice structures 2013-05-23 22:51:07 -07:00
issue5603.go cmd/cgo: use gcc_struct attribute for packed structs to work around GCC PR52991. 2013-06-09 22:06:29 +08:00
issue5740.go cmd/ld: handle duplicate static symbols in COFF and Mach-O files. 2013-09-18 22:27:25 -04:00
issue5740a.c cmd/ld: handle duplicate static symbols in COFF and Mach-O files. 2013-09-18 22:27:25 -04:00
issue5740b.c cmd/ld: handle duplicate static symbols in COFF and Mach-O files. 2013-09-18 22:27:25 -04:00
issue5986.go cmd/go: fix missing __mingw_fprintf symbol for cgo on windows 2013-09-19 01:20:02 -04:00
issue6128.go cmd/cgo: fix Xcode 5 incompatibility for #defined expressions 2013-10-15 14:34:46 -04:00
issue6390.go cmd/cgo: fix build (missing file from earlier CL) 2013-09-16 14:21:54 -04:00
issue6472.go debug/dwarf: handle surprising clang encoding 2013-10-09 11:08:22 -04:00
issue6506.go misc/cgo/test: cut out non-standard functions 2013-10-15 14:25:29 -04:00
issue6612.go cmd/cgo: stop using compiler error message text to analyze C names 2013-10-18 15:56:25 -04:00
setgid_linux.go misc/cgo/test: only run setgid test on GNU/Linux 2012-07-28 10:40:51 -07:00
sleep_windows_386.go cmd/go: new cgo build procedure 2012-08-17 03:42:34 +08:00