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06ad3b2de1
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
55 lines
2.8 KiB
Go
55 lines
2.8 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cgotest
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import "testing"
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// The actual test functions are in non-_test.go files
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// so that they can use cgo (import "C").
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// These wrappers are here for gotest to find.
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func TestAlign(t *testing.T) { testAlign(t) }
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func TestConst(t *testing.T) { testConst(t) }
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func TestEnum(t *testing.T) { testEnum(t) }
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func TestAtol(t *testing.T) { testAtol(t) }
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func TestErrno(t *testing.T) { testErrno(t) }
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func TestMultipleAssign(t *testing.T) { testMultipleAssign(t) }
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func TestUnsignedInt(t *testing.T) { testUnsignedInt(t) }
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func TestCallback(t *testing.T) { testCallback(t) }
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func TestCallbackGC(t *testing.T) { testCallbackGC(t) }
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func TestCallbackPanic(t *testing.T) { testCallbackPanic(t) }
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func TestCallbackPanicLoop(t *testing.T) { testCallbackPanicLoop(t) }
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func TestCallbackPanicLocked(t *testing.T) { testCallbackPanicLocked(t) }
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func TestPanicFromC(t *testing.T) { testPanicFromC(t) }
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func TestZeroArgCallback(t *testing.T) { testZeroArgCallback(t) }
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func TestBlocking(t *testing.T) { testBlocking(t) }
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func Test1328(t *testing.T) { test1328(t) }
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func TestParallelSleep(t *testing.T) { testParallelSleep(t) }
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func TestSetEnv(t *testing.T) { testSetEnv(t) }
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func TestHelpers(t *testing.T) { testHelpers(t) }
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func TestLibgcc(t *testing.T) { testLibgcc(t) }
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func Test1635(t *testing.T) { test1635(t) }
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func TestPrintf(t *testing.T) { testPrintf(t) }
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func Test4029(t *testing.T) { test4029(t) }
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func TestBoolAlign(t *testing.T) { testBoolAlign(t) }
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func Test3729(t *testing.T) { test3729(t) }
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func Test3775(t *testing.T) { test3775(t) }
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func TestCthread(t *testing.T) { testCthread(t) }
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func TestCallbackCallers(t *testing.T) { testCallbackCallers(t) }
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func Test5227(t *testing.T) { test5227(t) }
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func TestCflags(t *testing.T) { testCflags(t) }
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func Test5337(t *testing.T) { test5337(t) }
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func Test5548(t *testing.T) { test5548(t) }
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func Test5603(t *testing.T) { test5603(t) }
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func Test3250(t *testing.T) { test3250(t) }
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func TestCallbackStack(t *testing.T) { testCallbackStack(t) }
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func TestFpVar(t *testing.T) { testFpVar(t) }
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func Test4339(t *testing.T) { test4339(t) }
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func Test6390(t *testing.T) { test6390(t) }
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func Test5986(t *testing.T) { test5986(t) }
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func TestNaming(t *testing.T) { testNaming(t) }
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func BenchmarkCgoCall(b *testing.B) { benchCgoCall(b) }
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