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cmd/cgo: avoid using common names for sniffing

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Current code uses names like "x" and "s" which can conflict with user's
code easily. Use cryptographic names.

Fixes #21668

Change-Id: Ib6d3d6327aa5b92d95c71503d42e3a79d96c8e15
Reviewed-on: https://go-review.googlesource.com/59710
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Hiroshi Ioka 2017-08-29 07:39:57 +09:00 • committed by Ian Lance Taylor
parent 93471a1390
commit 77acf19a59
2 changed files with 23 additions and 10 deletions
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20
src/cmd/cgo/gcc.go
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@ -296,15 +296,15 @@ func (p *Package) guessKinds(f *File) []*Name {
// For each name, we generate these lines, where xxx is the index in toSniff plus one.
//
// #line xxx "not-declared"
// void __cgo_f_xxx_1(void) { __typeof__(name) *__cgo_undefined__; }
// void __cgo_f_xxx_1(void) { __typeof__(name) *__cgo_undefined__1; }
// #line xxx "not-type"
// void __cgo_f_xxx_2(void) { name *__cgo_undefined__; }
// void __cgo_f_xxx_2(void) { name *__cgo_undefined__2; }
// #line xxx "not-int-const"
// void __cgo_f_xxx_3(void) { enum { __cgo_undefined__ = (name)*1 }; }
// void __cgo_f_xxx_3(void) { enum { __cgo_undefined__3 = (name)*1 }; }
// #line xxx "not-num-const"
// void __cgo_f_xxx_4(void) { static const double x = (name); }
// void __cgo_f_xxx_4(void) { static const double __cgo_undefined__4 = (name); }
// #line xxx "not-str-lit"
// void __cgo_f_xxx_5(void) { static const char x[] = (name); }
// void __cgo_f_xxx_5(void) { static const char __cgo_undefined__5[] = (name); }
// #line xxx "not-signed-int-const"
// #if 0 < -(name)
// #line xxx "not-signed-int-const"
@ -327,15 +327,15 @@ func (p *Package) guessKinds(f *File) []*Name {
for i, n := range names {
fmt.Fprintf(&b, "#line %d \"not-declared\"\n"+
"void __cgo_f_%d_1(void) { __typeof__(%s) *__cgo_undefined__; }\n"+
"void __cgo_f_%d_1(void) { __typeof__(%s) *__cgo_undefined__1; }\n"+
"#line %d \"not-type\"\n"+
"void __cgo_f_%d_2(void) { %s *__cgo_undefined__; }\n"+
"void __cgo_f_%d_2(void) { %s *__cgo_undefined__2; }\n"+
"#line %d \"not-int-const\"\n"+
"void __cgo_f_%d_3(void) { enum { __cgo_undefined__ = (%s)*1 }; }\n"+
"void __cgo_f_%d_3(void) { enum { __cgo_undefined__3 = (%s)*1 }; }\n"+
"#line %d \"not-num-const\"\n"+
"void __cgo_f_%d_4(void) { static const double x = (%s); }\n"+
"void __cgo_f_%d_4(void) { static const double __cgo_undefined__4 = (%s); }\n"+
"#line %d \"not-str-lit\"\n"+
"void __cgo_f_%d_5(void) { static const char s[] = (%s); }\n"+
"void __cgo_f_%d_5(void) { static const char __cgo_undefined__5[] = (%s); }\n"+
"#line %d \"not-signed-int-const\"\n"+
"#if 0 < (%s)\n"+
"#line %d \"not-signed-int-const\"\n"+