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package/libselinux: fix build with musl

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musl does not define glibcisms, so we are missing some macros.

Define what we need in case the macro is missing. We're using a dumb
implementation, which is rather slow, to avoid copying from glibc, to
avoid propagating the LGPL to libselinux, which is Public Domain.

Fixes a bunch of autobuild failures:
    http://autobuild.buildroot.org/results/d4d/d4d209719d1ce5219f84719ad72fcb6a0c684007/
    http://autobuild.buildroot.org/results/1a6/1a65cc3d2c23a3c17c605788be62dbd18cbdaf76/
    http://autobuild.buildroot.org/results/0d0/0d0e4713833182d0f634b9b39b2c56f2bc0adcac/
    ...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Clayton Shotwell <clshotwe@rockwellcollins.com>
Reviewed-by: Clayton Shotwell <clayton.shotwell@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Yann E. MORIN 2015-07-26 21:03:16 +02:00 committed by Thomas Petazzoni
parent 37dde2d313
commit cac3cf8f9c
1 changed files with 30 additions and 0 deletions
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30
package/libselinux/0002-fix-musl-build.patch Normal file
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@ -0,0 +1,30 @@
fix undefined macros in musl
musl does not define glibc-specific macros, so use a simple version of
the macro when it is not defined.
This is very inefficient, however, but copying the code from glibc is
not really possible because it is LGPL while libselinux in Public
Domain, and we want to avoid license propagation, so this macro is
completely written from scratch, and non-optimal.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
diff -durN libselinux-2.1.13.orig/src/booleans.c libselinux-2.1.13/src/booleans.c
--- libselinux-2.1.13.orig/src/booleans.c 2013-02-06 02:43:22.000000000 +0100
+++ libselinux-2.1.13/src/booleans.c 2015-07-26 20:40:41.311801914 +0200
@@ -62,6 +62,14 @@
goto bad;
}
+/* Simple (but inefficient) version of _D_ALLOC_NAMLEN when
+ * building with a C library that misses it (e.g. musl).
+ * Note: glibc does a strlen on (d)->d_name, so assume it is safe.
+ */
+#ifndef _D_ALLOC_NAMLEN
+#define _D_ALLOC_NAMLEN(d) (strlen((d)->d_name)+1)
+#endif
+
for (i = 0; i < *len; i++) {
n[i] = (char *)malloc(_D_ALLOC_NAMLEN(namelist[i]));
if (!n[i]) {