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Date: Mon, 10 Jan 2022 19:36:04 -0500
From: Rich Felker <dalias@...c.org>
To: Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
Cc: musl@...ts.openwall.com,
Milan P . Stanić <mps@...anta.net>
Subject: Re: [PATCH 1/1] honor __WCHAR_TYPE__ on x86_64, arm, arm64,
riscv64
On Tue, Jan 11, 2022 at 01:25:18AM +0100, Heinrich Schuchardt wrote:
> Some programs like U-Boot are compiled with GCC option -fshort-wchar.
> In this case wchar_t must be a 16 bit type.
This is not something you can just change with an option. The wchar_t
type is an ABI contract with the library functions that take (or take
pointers to) wchar_t.
Can you explain how this actually comes up in the applications so we
can look into getting them fixed?
> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
> ---
> arch/aarch64/bits/alltypes.h.in | 5 +++++
> arch/arm/bits/alltypes.h.in | 4 ++++
> arch/riscv64/bits/alltypes.h.in | 4 ++++
> arch/x86_64/bits/alltypes.h.in | 4 ++++
> 4 files changed, 17 insertions(+)
>
> diff --git a/arch/aarch64/bits/alltypes.h.in b/arch/aarch64/bits/alltypes.h.in
> index c547ca0b..c0263348 100644
> --- a/arch/aarch64/bits/alltypes.h.in
> +++ b/arch/aarch64/bits/alltypes.h.in
> @@ -11,8 +11,13 @@
> #define __LONG_MAX 0x7fffffffffffffffL
>
> #ifndef __cplusplus
> +#ifdef __WCHAR_TYPE__
> +TYPEDEF __WCHAR_TYPE__ wchar_t;
> +#else
> TYPEDEF unsigned wchar_t;
> #endif
> +#endif
> +
> TYPEDEF unsigned wint_t;
>
> TYPEDEF int blksize_t;
> diff --git a/arch/arm/bits/alltypes.h.in b/arch/arm/bits/alltypes.h.in
> index d62bd7bd..9596466b 100644
> --- a/arch/arm/bits/alltypes.h.in
> +++ b/arch/arm/bits/alltypes.h.in
> @@ -12,8 +12,12 @@
> #define __LONG_MAX 0x7fffffffL
>
> #ifndef __cplusplus
> +#ifdef __WCHAR_TYPE__
> +TYPEDEF __WCHAR_TYPE__ wchar_t;
> +#else
> TYPEDEF unsigned wchar_t;
> #endif
> +#endif
>
> TYPEDEF float float_t;
> TYPEDEF double double_t;
> diff --git a/arch/riscv64/bits/alltypes.h.in b/arch/riscv64/bits/alltypes.h.in
> index 4579d174..f8f8b7e5 100644
> --- a/arch/riscv64/bits/alltypes.h.in
> +++ b/arch/riscv64/bits/alltypes.h.in
> @@ -6,8 +6,12 @@
> #define __LONG_MAX 0x7fffffffffffffffL
>
> #ifndef __cplusplus
> +#ifdef __WCHAR_TYPE__
> +TYPEDEF __WCHAR_TYPE__ wchar_t;
> +#else
> TYPEDEF int wchar_t;
> #endif
> +#endif
>
> TYPEDEF int blksize_t;
> TYPEDEF unsigned int nlink_t;
> diff --git a/arch/x86_64/bits/alltypes.h.in b/arch/x86_64/bits/alltypes.h.in
> index 5cd8a299..748ff632 100644
> --- a/arch/x86_64/bits/alltypes.h.in
> +++ b/arch/x86_64/bits/alltypes.h.in
> @@ -6,8 +6,12 @@
> #define __LONG_MAX 0x7fffffffffffffffL
>
> #ifndef __cplusplus
> +#ifdef __WCHAR_TYPE__
> +TYPEDEF __WCHAR_TYPE__ wchar_t;
> +#else
> TYPEDEF int wchar_t;
> #endif
> +#endif
>
> #if defined(__FLT_EVAL_METHOD__) && __FLT_EVAL_METHOD__ == 2
> TYPEDEF long double float_t;
> --
> 2.33.1
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