* [PATCH] alloca.3: correct information on getting non-inlined version with gcc+glibc
@ 2013-05-12 11:26 Adrian Bunk
[not found] ` <1368357967-8813-1-git-send-email-bunk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Adrian Bunk @ 2013-05-12 11:26 UTC (permalink / raw)
To: linux-man-u79uwXL29TY76Z2rM5mHXA
- remove the incorrect information that -fno-builtin would help
- add -std=c11 to the list of strict options
- emphasize more that both the gcc option and not including
alloca.h are needed
- add the #ifdef from the glibc alloca.h to make the situation clearer
Signed-off-by: Adrian Bunk <bunk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
man3/alloca.3 | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/man3/alloca.3 b/man3/alloca.3
index 73b88f5..0d593ed 100644
--- a/man3/alloca.3
+++ b/man3/alloca.3
@@ -40,7 +40,7 @@
.\" Various rewrites and additions (notes on longjmp() and SIGSEGV).
.\" Weaken warning against use of alloca() (as per Debian bug 461100).
.\"
-.TH ALLOCA 3 2008-01-24 "GNU" "Linux Programmer's Manual"
+.TH ALLOCA 3 2013-05-12 "GNU" "Linux Programmer's Manual"
.SH NAME
alloca \- allocate memory that is automatically freed
.SH SYNOPSIS
@@ -110,20 +110,22 @@ This is not done when either the
.IR "\-std=c89" ,
.IR "\-std=c99" ,
or the
-.IR "\-fno\-builtin"
+.IR "\-std=c11"
option is given
-(and the header
+.BR and
+the header
.I <alloca.h>
-is not included).
-But beware!
-By default the glibc version of
+is not included.
+Otherwise (without an \-ansi or \-std=c* option) the glibc version of
.I <stdlib.h>
includes
.I <alloca.h>
-and that contains the line:
+and that contains the lines:
.nf
+ #ifdef __GNUC__
#define alloca(size) __builtin_alloca (size)
+ #endif
.fi
with messy consequences if one has a private version of this function.
--
1.7.10.4
--
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* Re: [PATCH] alloca.3: correct information on getting non-inlined version with gcc+glibc
[not found] ` <1368357967-8813-1-git-send-email-bunk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
@ 2013-05-19 18:01 ` Michael Kerrisk
0 siblings, 0 replies; 2+ messages in thread
From: Michael Kerrisk @ 2013-05-19 18:01 UTC (permalink / raw)
To: Adrian Bunk; +Cc: linux-man-u79uwXL29TY76Z2rM5mHXA
On 05/12/13 13:26, Adrian Bunk wrote:
> - remove the incorrect information that -fno-builtin would help
> - add -std=c11 to the list of strict options
> - emphasize more that both the gcc option and not including
> alloca.h are needed
> - add the #ifdef from the glibc alloca.h to make the situation clearer
>
> Signed-off-by: Adrian Bunk <bunk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Thanks, Adrian. Applied.
Cheers,
Michael
> ---
> man3/alloca.3 | 16 +++++++++-------
> 1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/man3/alloca.3 b/man3/alloca.3
> index 73b88f5..0d593ed 100644
> --- a/man3/alloca.3
> +++ b/man3/alloca.3
> @@ -40,7 +40,7 @@
> .\" Various rewrites and additions (notes on longjmp() and SIGSEGV).
> .\" Weaken warning against use of alloca() (as per Debian bug 461100).
> .\"
> -.TH ALLOCA 3 2008-01-24 "GNU" "Linux Programmer's Manual"
> +.TH ALLOCA 3 2013-05-12 "GNU" "Linux Programmer's Manual"
> .SH NAME
> alloca \- allocate memory that is automatically freed
> .SH SYNOPSIS
> @@ -110,20 +110,22 @@ This is not done when either the
> .IR "\-std=c89" ,
> .IR "\-std=c99" ,
> or the
> -.IR "\-fno\-builtin"
> +.IR "\-std=c11"
> option is given
> -(and the header
> +.BR and
> +the header
> .I <alloca.h>
> -is not included).
> -But beware!
> -By default the glibc version of
> +is not included.
> +Otherwise (without an \-ansi or \-std=c* option) the glibc version of
> .I <stdlib.h>
> includes
> .I <alloca.h>
> -and that contains the line:
> +and that contains the lines:
> .nf
>
> + #ifdef __GNUC__
> #define alloca(size) __builtin_alloca (size)
> + #endif
>
> .fi
> with messy consequences if one has a private version of this function.
>
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2013-05-12 11:26 [PATCH] alloca.3: correct information on getting non-inlined version with gcc+glibc Adrian Bunk
[not found] ` <1368357967-8813-1-git-send-email-bunk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2013-05-19 18:01 ` Michael Kerrisk
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