patches/glibc/ports-2.10.1/200-fadvise64_64.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Sep 12 23:51:25 2010 +0200 (2010-09-12)
changeset 2123 ff2181adbd28
permissions -rw-r--r--
cc/gcc: disable complibs if not selected

Force gcc to not link with some companion libraries when
there are not needed (because selected-out).

There is no option to tell gcc *not* to build the Graphite and/or
LTO stuff. They *will* be built if gcc finds the suitable companion
libraries. If we do not provide them, but the host has them, then
gcc *will* find them, and link with them.

Consider the following:
- host has suitable PPL and CLooG (eg. Debian Squeeze)
- user wants to build gcc>=4.4
- user de-selects GRAPHITE
- gcc will find the hosts PPL and CLooG, and will use them
- the user moves the toolchain to an older host that does
not have them (eg. Debian Lenny)
- the toolchain fails, when it was properly setup not to

So, explicitly tell gcc *not* to use unneeded companion libs.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
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ripped from Debian
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 sysdeps/unix/sysv/linux/posix_fadvise.c |   13 +++++++++++++
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 1 file changed, 13 insertions(+)
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diff -durN glibc-2.10.1.orig/sysdeps/unix/sysv/linux/posix_fadvise.c glibc-2.10.1/sysdeps/unix/sysv/linux/posix_fadvise.c
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--- glibc-2.10.1.orig/sysdeps/unix/sysv/linux/posix_fadvise.c	2003-08-17 02:36:22.000000000 +0200
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+++ glibc-2.10.1/sysdeps/unix/sysv/linux/posix_fadvise.c	2009-11-13 00:50:03.000000000 +0100
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@@ -35,6 +35,19 @@
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     return INTERNAL_SYSCALL_ERRNO (ret, err);
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   return 0;
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 #else
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+# ifdef __NR_fadvise64_64
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+  INTERNAL_SYSCALL_DECL (err);  
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+  int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd,
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+			      __LONG_LONG_PAIR ((long) (offset >> 31),
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+						(long) offset),
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+			      __LONG_LONG_PAIR ((long) (len >> 31),
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+						(long) len),
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+			      advise);
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+  if (INTERNAL_SYSCALL_ERROR_P (ret, err))
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+    return INTERNAL_SYSCALL_ERRNO (ret, err);
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+  return 0;
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+# else
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   return ENOSYS;
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+# endif
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 #endif
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 }