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KJ Tsanaktsidis 786120b55d cmd/cgo: document #include <> search path behaviour 
cgo effectively prepends -I${SRCDIR} to the header include path of all
preambles it processes, so when an #include <> matches a header file
both in the source directory and also another include directory, the
local copy will be used in preference.

This behaviour is surprising but unfortunately also longstanding and
relied upon by packages in the wild, so the best we can do is to
document it.

Fixes #41059

Change-Id: If6d2818294b2bd94ea0fe5fd6ce77e54b3e167a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/251758
Reviewed-by: Ian Lance Taylor <iant@golang.org>
 		2020-09-01 23:12:18 +00:00
..
testdata cmd/cgo,cmd/fix,misc/cgo: map the EGLConfig C type to uintptr in Go 2020-05-31 09:48:08 +00:00
backdoor.go
…
buildid_linux.go misc/cgo/test: avoid endless loop when we can't parse notes 2018-01-11 19:55:49 +00:00
callback.go cmd/compile: use existing instructions instead of nops for inline marks 2019-03-25 16:49:29 +00:00
callback_c.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
callback_c_gc.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
callback_c_gccgo.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
cgo_linux_test.go misc/cgo/test: skip Setgid test on Android 2019-04-08 05:56:14 +00:00
cgo_stubs_android_test.go misc/cgo/test: consolidate tests into fewer cgo source files 2019-05-22 12:52:33 +00:00
cgo_test.go cmd/cgo: build unique C type cache keys from parent names 2019-10-05 00:16:04 +00:00
cgo_thread_lock.go misc/cgo/test: add test that gccgo fails 2016-10-13 00:03:57 +00:00
cgo_unix_test.go runtime/cgo: retry pthread_create on EAGAIN 2016-12-05 18:46:18 +00:00
cthread_unix.c cmd/dist, misc/cgo: enable tests for aix/ppc64 2019-03-20 14:38:44 +00:00
cthread_windows.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue4029.c cmd/cgo: permit missing dynamic symbol section 2018-07-02 17:50:00 +00:00
issue4029.go cmd/cgo: permit missing dynamic symbol section 2018-07-02 17:50:00 +00:00
issue4029w.go cmd/cgo: permit missing dynamic symbol section 2018-07-02 17:50:00 +00:00
issue4273.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue4273b.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue4339.c
…
issue4339.h
…
issue5548_c.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue5740a.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue5740b.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue6833_c.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue6907export_c.c cmd/cgo: permit passing string values directly between Go and C 2017-11-15 03:36:54 +00:00
issue6997_linux.c misc/cgo/test,cmd/dist: enable (most) Cgo tests on Android 2016-06-01 22:06:51 +00:00
issue6997_linux.go misc/cgo/test,cmd/dist: enable (most) Cgo tests on Android 2016-06-01 22:06:51 +00:00
issue7234_test.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue8148.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue8331.h all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue8517.go
…
issue8517_windows.c
…
issue8517_windows.go
…
issue8694.go misc/cgo/test,cmd/dist: enable (most) Cgo tests on Android 2016-06-01 22:06:51 +00:00
issue8811.c all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
issue18146.go misc/cgo/test: consolidate tests into fewer cgo source files 2019-05-22 12:52:33 +00:00
issue20910.c cmd/cgo: unify cgo output for gc and gccgo 2017-08-16 21:57:56 +00:00
issue21897.go misc/cgo/test: re-enable darwin cgo tests in race mode 2020-01-10 10:04:49 +00:00
issue21897b.go misc/cgo/test: re-enable darwin cgo tests in race mode 2020-01-10 10:04:49 +00:00
issue31891.c cmd/cgo: build unique C type cache keys from parent names 2019-10-05 00:16:04 +00:00
overlaydir_test.go misc: remove use of relative directories in overlayDir functions 2019-11-25 16:26:15 +00:00
pkg_test.go all: remove scattered remnants of darwin/arm 2020-04-08 18:35:49 +00:00
setgid_linux.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
sigaltstack.go all: remove scattered remnants of darwin/386 2020-04-08 18:37:38 +00:00
sigprocmask.c misc/cgo/test: add retry loop around pthread_create in TestSigprocmask 2018-06-27 04:33:10 +00:00
sigprocmask.go misc/cgo/test: log error value in testSigprocmask 2018-04-25 20:26:39 +00:00
test.go cmd/cgo: document #include <> search path behaviour 2020-09-01 23:12:18 +00:00
test_unix.go misc/cgo/test: consolidate tests into fewer cgo source files 2019-05-22 12:52:33 +00:00
test_windows.go misc/cgo/test: consolidate tests into fewer cgo source files 2019-05-22 12:52:33 +00:00
testx.go cmd/cgo: use consistent tag for a particular struct 2020-04-14 18:59:37 +00:00