skalibs: new package

This new package provides skalibs, a collection of free software / open
source C development files used for building all softwares from
skarnet.org.

Note that, though skalibs (and all skarnet softwares) follows the
"./configure; make; make install" convention, it does not behave like a
traditional autotools project:

 - static libraries are installed in $prefix/usr/lib/skalibs.
 - pkg-config and libtool are not used: instead a custom system called
   "sysdeps" is used and locations to libraries and headers are to be
   passed explicitly via options of the './configure' script.

The host variant is provided to allow building the host variants of the
other skarnet softwares.

Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
[Thomas: remove post install target hook, do it directly in the target
installation commands.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/Config.in

@@ -1367,6 +1367,7 @@ endif
 	source "package/qhull/Config.in"
 	source "package/qlibc/Config.in"
 	source "package/shapelib/Config.in"
+	source "package/skalibs/Config.in"
 	source "package/sphinxbase/Config.in"
 	source "package/startup-notification/Config.in"
 	source "package/tinycbor/Config.in"

package/skalibs/0001-No-runtime-tests-for-endianness.patch

@@ -0,0 +1,95 @@
+From 1e6f0b094c6ce6454be572704b866d2ce0962e59 Mon Sep 17 00:00:00 2001
+From: Eric Le Bihan <eric.le.bihan.dev@free.fr>
+Date: Sun, 4 Dec 2016 19:10:40 +0100
+Subject: [PATCH] No runtime tests for endianness
+
+Replace build and execution of runtime test programs for determining
+the endianness of the target with compile time test programs.
+
+This improves support for cross-compilation.
+
+Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
+---
+ configure                     | 15 +++++++++++----
+ src/sysdeps/trybigendian.c    | 16 ++++++++++++++++
+ src/sysdeps/trylittleendian.c | 16 ++++++++++++++++
+ 3 files changed, 43 insertions(+), 4 deletions(-)
+ create mode 100644 src/sysdeps/trybigendian.c
+ create mode 100644 src/sysdeps/trylittleendian.c
+
+diff --git a/configure b/configure
+index 1579025..4da9c5e 100755
+--- a/configure
++++ b/configure
+@@ -463,13 +463,20 @@ EOF
+   fi
+   exec 3>&-
+ 
+-  echo "Checking system endianness..."
+-  $CC_AUTO $CPPFLAGS_AUTO $CFLAGS_AUTO -o tryendianness src/sysdeps/tryendianness.c
+-  endianness=$(./tryendianness) || fail "$0: unable to determine endianness"
++    echo "Checking system endianness..."
++  if $CC_AUTO $CPPFLAGS_AUTO $CFLAGS_AUTO -o trybigendian src/sysdeps/trybigendian.c 2>/dev/null; then
++      endianness=big
++  else
++      if $CC_AUTO $CPPFLAGS_AUTO $CFLAGS_AUTO -o trylittleendian src/sysdeps/trylittleendian.c 2>/dev/null; then
++          endianness=little
++      else
++          fail "$0: unable to determine endianness"
++      fi
++  fi
+   echo "endianness: $endianness" >> $sysdeps/sysdeps
+   echo "#define ${package_macro_name}_ENDIANNESS \"$endianness\"" >> $sysdeps/sysdeps.h
+   echo "  ... $endianness"
+-  rm -f tryendianness
++  rm -f trybigendian trylittleendian
+ 
+   trytypesize ushort USHORT "unsigned short"
+   trytypesize uint UINT "unsigned int"
+diff --git a/src/sysdeps/trybigendian.c b/src/sysdeps/trybigendian.c
+new file mode 100644
+index 0000000..d857572
+--- /dev/null
++++ b/src/sysdeps/trybigendian.c
+@@ -0,0 +1,16 @@
++#if defined(__BYTE_ORDER) && (__BYTE_ORDER == __BIG_ENDIAN) ||	       \
++	defined(__BYTE_ORDER__) && (__BYTE_ORDER__  == __ORDER_BIG_ENDIAN__) || \
++	defined(__BIG_ENDIAN) ||				       \
++	defined(__ARMEB__) ||					       \
++	defined(__THUMBEB__) ||				       \
++	defined(__AARCH64EB__) ||				       \
++	defined(_MIPSEB) || defined(__MIPSEB) || defined(__MIPSEB__)
++#define YEAH
++#else
++#error "not big endian"
++#endif
++
++int main(void)
++{
++	return 0;
++}
+diff --git a/src/sysdeps/trylittleendian.c b/src/sysdeps/trylittleendian.c
+new file mode 100644
+index 0000000..eba065a
+--- /dev/null
++++ b/src/sysdeps/trylittleendian.c
+@@ -0,0 +1,16 @@
++#if defined(__BYTE_ORDER) && (__BYTE_ORDER == __LITTLE_ENDIAN) ||	\
++	defined(__BYTE_ORDER__) && (__BYTE_ORDER__  == __ORDER_LITTLE_ENDIAN__) || \
++	defined(__LITTLE_ENDIAN) ||					\
++	defined(__ARMEL__) ||						\
++	defined(__THUMBEL__) ||					\
++	defined(__AARCH64EL__) ||					\
++	defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__)
++#define YEAH
++#else
++#error "not little endian"
++#endif
++
++int main(void)
++{
++	return 0;
++}
+-- 
+2.5.5
+

package/skalibs/0002-No-runtime-tests-for-type-sizes.patch

@@ -0,0 +1,54 @@
+From d868600a3f437750bc44a783d677a25a48100096 Mon Sep 17 00:00:00 2001
+From: Eric Le Bihan <eric.le.bihan.dev@free.fr>
+Date: Sun, 4 Dec 2016 19:11:25 +0100
+Subject: [PATCH] No runtime tests for type sizes
+
+Replace build and execution of runtime test programs for determining
+some type sizes of the target with compile time test programs.
+
+This improves support for cross-compilation.
+
+Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
+---
+ configure | 24 +++++++++++++++++++++---
+ 1 file changed, 21 insertions(+), 3 deletions(-)
+
+diff --git a/configure b/configure
+index 4da9c5e..b5926ca 100755
+--- a/configure
++++ b/configure
+@@ -157,10 +157,28 @@ choose () {
+ 
+ trytypesize () {
+   echo "Checking size of $3..."
+-  $CC_AUTO $CPPFLAGS_AUTO $CFLAGS_AUTO $LDFLAGS_AUTO -o trysizeof$1 src/sysdeps/trysizeof$1.c
+-  type_size=$(./trysizeof$1) || fail "$0: unable to determine size of $3"
++  r=false
++  type_size=0
++  while true; do
++    cat<<EOF>trysizeof$1.c
++#include <sys/types.h>
++
++int main(void)
++{
++  static int v = 1 / !!((sizeof($3) == $type_size));
++  return 0;
++}
++EOF
++    if $CC_AUTO $CPPFLAGS_AUTO $CFLAGS_AUTO $LDFLAGS_AUTO -o trysizeof$1 trysizeof$1.c 2>/dev/null; then
++        r=true
++        break
++    fi
++    type_size=$(expr $type_size + 1)
++    test $type_size -le 16 || break
++  done
++  test $r = true || fail "$0: unable to determine size of $3"
+   type_bits=$(expr 8 \* $type_size)
+-  rm -f trysizeof$1
++  rm -f trysizeof$1 trysizeof$1.c
+   echo "sizeof$1: $type_size" >> $sysdeps/sysdeps
+   echo "#define ${package_macro_name}_SIZEOF$2 $type_size" >> $sysdeps/sysdeps.h
+   echo "#define ${package_macro_name}_$2_BITS $type_bits" >> $sysdeps/sysdeps.h
+-- 
+2.5.5
+

package/skalibs/Config.in

@@ -0,0 +1,9 @@
+config BR2_PACKAGE_SKALIBS
+	bool "skalibs"
+	depends on BR2_USE_MMU # fork()
+	help
+	  skalibs is a package centralizing the FOSS C development
+	  files used for building all software at skarnet.org:
+	  it contains essentially general-purpose libraries.
+
+	  http://skarnet.org/software/skalibs/

package/skalibs/skalibs.hash

@@ -0,0 +1,2 @@
+# Locally generated
+sha256 0708172bc2ec9825f8a4f312d35f8dcd94da5f291425a598c33c873b3de77df8 skalibs-2.4.0.2.tar.gz

package/skalibs/skalibs.mk

@@ -0,0 +1,54 @@
+################################################################################
+#
+# skalibs
+#
+################################################################################
+
+SKALIBS_VERSION = 2.4.0.2
+SKALIBS_SITE = http://skarnet.org/software/skalibs
+SKALIBS_LICENSE = ISC
+SKALIBS_LICENSE_FILES = COPYING
+SKALIBS_INSTALL_STAGING = YES
+
+SKALIBS_CONF_OPTS = \
+	--prefix=/usr \
+	--with-default-path=/sbin:/usr/sbin:/bin:/usr/bin \
+	$(SHARED_STATIC_LIBS_OPTS)
+
+define SKALIBS_CONFIGURE_CMDS
+	(cd $(@D); $(TARGET_CONFIGURE_OPTS) ./configure $(SKALIBS_CONF_OPTS))
+endef
+
+define SKALIBS_BUILD_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)
+endef
+
+define SKALIBS_INSTALL_TARGET_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) DESTDIR=$(TARGET_DIR) install
+	rm -rf $(TARGET_DIR)/usr/lib/skalibs
+endef
+
+define SKALIBS_INSTALL_STAGING_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) DESTDIR=$(STAGING_DIR) install
+endef
+
+HOST_SKALIBS_CONF_OPTS = \
+	--prefix=$(HOST_DIR)/usr \
+	--disable-static \
+	--enable-shared \
+	--disable-allstatic
+
+define HOST_SKALIBS_CONFIGURE_CMDS
+	(cd $(@D); $(HOST_CONFIGURE_OPTS) ./configure $(HOST_SKALIBS_CONF_OPTS))
+endef
+
+define HOST_SKALIBS_BUILD_CMDS
+	$(HOST_MAKE_ENV) $(MAKE) -C $(@D)
+endef
+
+define HOST_SKALIBS_INSTALL_CMDS
+	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) install
+endef
+
+$(eval $(generic-package))
+$(eval $(host-generic-package))