linux-kernel - [PATCH] UAPI: Strip the _UAPI prefix from header guards during header installation

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Message-ID: <20121113142641.16744.72039.stgit@warthog.procyon.org.uk>
Date:	Tue, 13 Nov 2012 14:26:41 +0000
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tomasz Torcz <tomek@...ebreaker.pl>,
	Josh Boyer <jwboyer@...hat.com>
Subject: [PATCH] UAPI: Strip the _UAPI prefix from header guards during
 header installation

Strip the _UAPI prefix from header guards during header installation so that
any userspace dependencies aren't affected.  glibc, for example, checks for
linux/types.h, linux/kernel.h, linux/compiler.h and linux/list.h by their
guards - though the last two aren't actually exported.

	libtool: compile:  gcc -std=gnu99 -DHAVE_CONFIG_H -I. -Wall -Werror -Wformat -Wformat-security -D_FORTIFY_SOURCE=2 -fno-delete-null-pointer-checks -fstack-protector -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-tables -c child.c  -fPIC -DPIC -o .libs/child.o
	In file included from cli.c:20:0:
	common.h:152:8: error: redefinition of 'struct sysinfo'
	In file included from /usr/include/linux/kernel.h:4:0,
			 from /usr/include/linux/sysctl.h:25,
			 from /usr/include/sys/sysctl.h:43,
			 from common.h:50,
			 from cli.c:20:
	/usr/include/linux/sysinfo.h:7:8: note: originally defined here

Reported-by: Tomasz Torcz <tomek@...ebreaker.pl>
Signed-off-by: David Howells <dhowells@...hat.com>
Acked-by: Josh Boyer <jwboyer@...hat.com>
---

 0 files changed

diff --git a/scripts/headers_install.pl b/scripts/headers_install.pl
index 239d22d..6c353ae 100644
--- a/scripts/headers_install.pl
+++ b/scripts/headers_install.pl
@@ -42,6 +42,9 @@ foreach my $filename (@files) {
 		$line =~ s/(^|\s)(inline)\b/$1__$2__/g;
 		$line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g;
 		$line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g;
+		$line =~ s/#ifndef _UAPI/#ifndef /;
+		$line =~ s/#define _UAPI/#define /;
+		$line =~ s!#endif /[*] _UAPI!#endif /* !;
 		printf {$out} "%s", $line;
 	}
 	close $out;

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