- 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@xxxxxxxxxx>
---
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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