From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Michael Zimmermann <sigmaepsilon92@gmail.com>
Cc: "edk2-devel@lists.01.org" <edk2-devel@lists.01.org>,
Leif Lindholm <leif.lindholm@linaro.org>
Subject: Re: [PATCH] ArmPkg/CompilerIntrinsicsLib: fix GCC8 warning for __aeabi_memcpy aliases
Date: Thu, 7 Jun 2018 09:05:10 +0200 [thread overview]
Message-ID: <CAKv+Gu93L6E76CtfO+8yetjZhwRMXzAdzJh8=OyQ2-AfjQ91Lg@mail.gmail.com> (raw)
In-Reply-To: <20180607054720.15940-1-sigmaepsilon92@gmail.com>
On 7 June 2018 at 07:47, Michael Zimmermann <sigmaepsilon92@gmail.com> wrote:
> This was the warning(shown for __aeabi_memcpy, __aeabi_memcpy4 and __aeabi_memcpy8):
> ArmPkg/Library/CompilerIntrinsicsLib/memcpy.c:42:6: error: '__aeabi_memcpy8' alias between functions of incompatible types 'void(void
> *, const void *, size_t)' {aka 'void(void *, const void *, unsigned int)'} and 'void *(void *, const void *, size_t)' {aka 'void
> *(void *, const void *, unsigned int)'} [-Werror=attribute-alias]
> void __aeabi_memcpy8(void *dest, const void *src, size_t n);
> ^~~~~~~~~~~~~~~
> ArmPkg/Library/CompilerIntrinsicsLib/memcpy.c:19:7: note: aliased declaration here
> void *__memcpy(void *dest, const void *src, size_t n)
>
> The problem is the different return type(void vs void*).
> This commit adds a wrapper '__aeabi___memcpy' with a void return value.
>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Michael Zimmermann <sigmaepsilon92@gmail.com>
> ---
> ArmPkg/Library/CompilerIntrinsicsLib/memcpy.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/memcpy.c b/ArmPkg/Library/CompilerIntrinsicsLib/memcpy.c
> index a944e00b89e1..507234186fa9 100644
> --- a/ArmPkg/Library/CompilerIntrinsicsLib/memcpy.c
> +++ b/ArmPkg/Library/CompilerIntrinsicsLib/memcpy.c
> @@ -31,14 +31,19 @@ __attribute__((__alias__("__memcpy")))
> void *memcpy(void *dest, const void *src, size_t n);
>
> #ifdef __arm__
> +static __attribute__((__used__))
> +void __aeabi___memcpy(void *dest, const void *src, size_t n)
> +{
> + __memcpy(dest, src, n);
> +}
>
> -__attribute__((__alias__("__memcpy")))
> +__attribute__((__alias__("__aeabi___memcpy")))
> void __aeabi_memcpy(void *dest, const void *src, size_t n);
>
> -__attribute__((__alias__("__memcpy")))
> +__attribute__((__alias__("__aeabi___memcpy")))
> void __aeabi_memcpy4(void *dest, const void *src, size_t n);
>
> -__attribute__((__alias__("__memcpy")))
> +__attribute__((__alias__("__aeabi___memcpy")))
> void __aeabi_memcpy8(void *dest, const void *src, size_t n);
>
> #endif
Thanks Michael.
Would this fix the problem as well?
--- a/ArmPkg/Library/CompilerIntrinsicsLib/memcpy.c
+++ b/ArmPkg/Library/CompilerIntrinsicsLib/memcpy.c
@@ -16,20 +16,21 @@
typedef __SIZE_TYPE__ size_t;
static __attribute__((__used__))
-void *__memcpy(void *dest, const void *src, size_t n)
+void __memcpy(void *dest, const void *src, size_t n)
{
unsigned char *d = dest;
unsigned char const *s = src;
while (n--)
*d++ = *s++;
+}
+void *memcpy(void *dest, const void *src, size_t n)
+{
+ __memcpy(dest, src, n);
return dest;
}
-__attribute__((__alias__("__memcpy")))
-void *memcpy(void *dest, const void *src, size_t n);
-
#ifdef __arm__
__attribute__((__alias__("__memcpy")))
next prev parent reply other threads:[~2018-06-07 7:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-07 5:47 [PATCH] ArmPkg/CompilerIntrinsicsLib: fix GCC8 warning for __aeabi_memcpy aliases Michael Zimmermann
2018-06-07 7:05 ` Ard Biesheuvel [this message]
2018-06-07 17:02 ` Michael Zimmermann
2018-06-11 9:46 ` Ard Biesheuvel
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