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genbindings/cabi: add automatic -D_Bool=bool handling

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mappu 2024-12-11 19:55:32 +13:00
parent 02fd3dae07
commit 641dbd6d21
1 changed files with 19 additions and 1 deletions
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20
cmd/genbindings/emitcabi.go
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@ -809,7 +809,25 @@ func emitBindingCpp(src *CppParsedHeader, filename string) (string, error) {
ret.WriteString(`#include <` + filename + ">\n")
ret.WriteString(`#include "gen_` + filename + "\"\n")
ret.WriteString("#include \"_cgo_export.h\"\n\n")
// We need to import the cgo header so that we can call functions exported
// from Go code
// This header is written in C99 and uses C99 features (_Bool). We are C++
// and _Bool is not defined anywhere
// There is stdbool.h (<cstdbool>) but that does the opposite (defines 'bool'
// in terms of C99's native _Bool type)
// This is not required in GCC nor Clang 12, but is required in Clang 16 and
// later. In the working compilers, it's likely that the _Bool definition is
// automatically applied in some non-strict mode by default.
// We have been recommending CGO_CXXFLAGS=-D_Bool=bool . Now that the problem
// is more well understood, do the equivalent thing automatically
ret.WriteString(`
#ifndef _Bool
#define _Bool bool
#endif
#include "_cgo_export.h"
`)
for _, c := range src.Classes {