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package/musl-compat-headers: provide compatibility headers not in musl

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musl provides neither sys/queue.h nor sys/cdefs.h. Those two headers are
however quite widely used in a lot of packages (though they should at
least not use cdefs.h which is only full of mostly-legacy macros, and
which is mostly an internal header of glibc and was never really meant to
be exposed to, and used by packages).

But we don't live in an ideal world, so a lot of packages break when
those two headers are missing.

We already took care of sys/queue.h with the netbsd-queue package. But
the need for cdefs.h is getting more and more pressing.

We rename the netbsd-queue package into musl-compat-headers, and we
make it install sys/queue.h (from NetBSD) and sys/cdefs.h (a minimalist
one we bundle in Buildroot). We can't use the cdefs.h from NetBSD
because it includes machine-dependent headers; instead we bundle a very
minimalistic one, that covers only what we need.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Yann E. MORIN 2016-08-18 23:50:13 +02:00 committed by Thomas Petazzoni
parent f55adea434
commit e31eb72040
11 changed files with 104 additions and 37 deletions
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2
package/Config.in
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@ -1324,7 +1324,7 @@ endif
source "package/mpfr/Config.in"
source "package/msgpack/Config.in"
source "package/mtdev2tuio/Config.in"
source "package/netbsd-queue/Config.in"
source "package/musl-compat-headers/Config.in"
source "package/openblas/Config.in"
source "package/orc/Config.in"
source "package/p11-kit/Config.in"

2
package/musl-compat-headers/Config.in Normal file
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@ -0,0 +1,2 @@
config BR2_PACKAGE_MUSL_COMPAT_HEADERS
bool

51
package/musl-compat-headers/cdefs.h Normal file
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@ -0,0 +1,51 @@
/* Copyright (C) 2016 Yann E. MORIN <yann.morin.1998@free.fr>
*
* This file is in the Public Domain.
*
* For jurisdictions in which the Public Domain does not exist
* or it is not otherwise applicable, this file is licensed CC0
* (Creative Commons Zero).
*/
/* This file contains definitions for non-standard macros defined by
* glibc, but quite commonly used in packages.
*
* Because they are non-standard, musl does not define those macros.
* It does not provide cdefs.h either.
*
* This file is a compatibility header written from scratch, to be
* installed when the C library is musl.
*
* Not all macros from the glibc's cdefs.h are available, only the
* most commonly used ones.
*
* Please refer to the glibc documentation and source code for
* explanations about those macros.
*/
#ifndef BUILDROOT_SYS_CDEFS_H
#define BUILDROOT_SYS_CDEFS_H
/* Function prototypes. */
#undef __P
#define __P(arg) arg
/* C declarations in C++ mode. */
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS
# define __END_DECLS
#endif
/* Don't throw exceptions in C functions. */
#ifndef __cplusplus
# define __THROW __attribute__ ((__nothrow__))
# define __NTH(f) __attribute__ ((__nothrow__)) f
#else
# define __THROW
# define __NTH(f) f
#endif
#endif /* ifndef BUILDROOT_SYS_CDEFS_H */

0
package/netbsd-queue/netbsd-queue.hash → package/musl-compat-headers/musl-compat-headers.hash
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34
package/musl-compat-headers/musl-compat-headers.mk Normal file
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@ -0,0 +1,34 @@
################################################################################
#
# musl-compat-headers
#
################################################################################
# No main site, just using extra downloads
MUSL_COMPAT_HEADERS_QUEUE_H = http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/sys/queue.h?rev=1.70
MUSL_COMPAT_HEADERS_EXTRA_DOWNLOADS = $(MUSL_COMPAT_HEADERS_QUEUE_H)
MUSL_COMPAT_HEADERS_LICENSE = BSD-3c, Public Domain or CC0
MUSL_COMPAT_HEADERS_LICENSE_FILES = queue.h cdefs.h
MUSL_COMPAT_HEADERS_ADD_TOOLCHAIN_DEPENDENCY = NO
# Only installs headers
MUSL_COMPAT_HEADERS_INSTALL_TARGET = NO
MUSL_COMPAT_HEADERS_INSTALL_STAGING = YES
# Copying both headers so legal-info finds them (they are _LICENSE_FILES)
define MUSL_COMPAT_HEADERS_EXTRACT_CMDS
$(INSTALL) -m 0644 -D $(DL_DIR)/$(notdir $(MUSL_COMPAT_HEADERS_QUEUE_H)) $(@D)/queue.h
$(INSTALL) -m 0644 -D $(MUSL_COMPAT_HEADERS_PKGDIR)/cdefs.h $(@D)/cdefs.h
endef
define MUSL_COMPAT_HEADERS_INSTALL_STAGING_CMDS
$(INSTALL) -D -m 0644 $(@D)/queue.h \
$(STAGING_DIR)/usr/include/sys/queue.h
$(INSTALL) -D -m 0644 $(@D)/cdefs.h \
$(STAGING_DIR)/usr/include/sys/cdefs.h
endef
$(eval $(generic-package))

3
package/musl/Config.in
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@ -3,5 +3,6 @@ config BR2_PACKAGE_MUSL
depends on BR2_TOOLCHAIN_USES_MUSL
default y
select BR2_PACKAGE_LINUX_HEADERS
select BR2_PACKAGE_NETBSD_QUEUE
select BR2_TOOLCHAIN_HAS_SSP
# Compatibility headers: cdefs.h, queue.h
select BR2_PACKAGE_MUSL_COMPAT_HEADERS

10
package/musl/musl.mk
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@ -13,10 +13,12 @@ MUSL_LICENSE_FILES = COPYRIGHT
# cross-compiler and the kernel headers
MUSL_DEPENDENCIES = host-gcc-initial linux-headers
# musl does not provide a sys/queue.h implementation, so add the
# netbsd-queue package that will install a sys/queue.h file in the
# staging directory based on the NetBSD implementation.
MUSL_DEPENDENCIES += netbsd-queue
# musl does not provide an implementation for sys/queue.h or sys/cdefs.h.
# So, add the musl-compat-headers package that will install those files,
# into the staging directory:
# sys/queue.h: header from NetBSD
# sys/cdefs.h: minimalist header bundled in Buildroot
MUSL_DEPENDENCIES += musl-compat-headers
# musl is part of the toolchain so disable the toolchain dependency
MUSL_ADD_TOOLCHAIN_DEPENDENCY = NO

2
package/netbsd-queue/Config.in
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@ -1,2 +0,0 @@
config BR2_PACKAGE_NETBSD_QUEUE
bool

24
package/netbsd-queue/netbsd-queue.mk
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@ -1,24 +0,0 @@
################################################################################
#
# netbsd-queue
#
################################################################################
NETBSD_QUEUE_VERSION = 1.70
NETBSD_QUEUE_SITE = http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/sys
NETBSD_QUEUE_SOURCE = queue.h?rev=$(NETBSD_QUEUE_VERSION)
NETBSD_QUEUE_LICENSE = BSD-3c
NETBSD_QUEUE_ADD_TOOLCHAIN_DEPENDENCY = NO
NETBSD_QUEUE_INSTALL_STAGING = YES
define NETBSD_QUEUE_EXTRACT_CMDS
cp $(DL_DIR)/$(NETBSD_QUEUE_SOURCE) $(@D)/queue.h
endef
define NETBSD_QUEUE_INSTALL_STAGING_CMDS
$(INSTALL) -D -m 0644 $(@D)/queue.h \
$(STAGING_DIR)/usr/include/sys/queue.h
endef
$(eval $(generic-package))

3
toolchain/toolchain-external/Config.in
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@ -727,7 +727,8 @@ config BR2_TOOLCHAIN_EXTERNAL_UCLIBC
config BR2_TOOLCHAIN_EXTERNAL_MUSL
bool
select BR2_TOOLCHAIN_USES_MUSL
select BR2_PACKAGE_NETBSD_QUEUE
# Compatibility headers: cdefs.h, queue.h
select BR2_PACKAGE_MUSL_COMPAT_HEADERS
if BR2_TOOLCHAIN_EXTERNAL_CUSTOM

10
toolchain/toolchain-external/toolchain-external.mk
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@ -246,11 +246,13 @@ TOOLCHAIN_EXTERNAL_CFLAGS += -msoft-float
TOOLCHAIN_EXTERNAL_TOOLCHAIN_WRAPPER_ARGS += -DBR_SOFTFLOAT=1
endif
# musl does not provide a sys/queue.h implementation, so add the
# netbsd-queue package that will install a sys/queue.h file in the
# staging directory based on the NetBSD implementation.
# musl does not provide an implementation for sys/queue.h or sys/cdefs.h.
# So, add the musl-compat-headers package that will install those files,
# into the staging directory:
# sys/queue.h: header from NetBSD
# sys/cdefs.h: minimalist header bundled in Buildroot
ifeq ($(BR2_TOOLCHAIN_USES_MUSL),y)
TOOLCHAIN_EXTERNAL_DEPENDENCIES += netbsd-queue
TOOLCHAIN_EXTERNAL_DEPENDENCIES += musl-compat-headers
endif
# The Linaro toolchain expects the libraries in