package/glibc/glibc.mk

   1 ################################################################################
   2 #
   3 # glibc
   4 #
   5 ################################################################################
   6
   7 GLIBC_VERSION = $(call qstrip,$(BR2_GLIBC_VERSION_STRING))
   8 GLIBC_SITE = $(BR2_GNU_MIRROR)/libc
   9 GLIBC_SOURCE = glibc-$(GLIBC_VERSION).tar.xz
  10 GLIBC_SRC_SUBDIR = .
  11
  12 GLIBC_LICENSE = GPLv2+ (programs), LGPLv2.1+, BSD-3c, MIT (library)
  13 GLIBC_LICENSE_FILES = $(addprefix $(GLIBC_SRC_SUBDIR)/,COPYING COPYING.LIB LICENSES)
  14
  15 # glibc is part of the toolchain so disable the toolchain dependency
  16 GLIBC_ADD_TOOLCHAIN_DEPENDENCY = NO
  17
  18 # Before glibc is configured, we must have the first stage
  19 # cross-compiler and the kernel headers
  20 GLIBC_DEPENDENCIES = host-gcc-initial linux-headers host-gawk
  21
  22 GLIBC_SUBDIR = build
  23
  24 GLIBC_INSTALL_STAGING = YES
  25
  26 GLIBC_INSTALL_STAGING_OPTS = install_root=$(STAGING_DIR) install
  27
  28 # Thumb build is broken, build in ARM mode
  29 ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)
  30 GLIBC_EXTRA_CFLAGS += -marm
  31 endif
  32
  33 # MIPS64 defaults to n32 so pass the correct -mabi if
  34 # we are using a different ABI. OABI32 is also used
  35 # in MIPS so we pass -mabi=32 in this case as well
  36 # even though it's not strictly necessary.
  37 ifeq ($(BR2_MIPS_NABI64),y)
  38 GLIBC_EXTRA_CFLAGS += -mabi=64
  39 else ifeq ($(BR2_MIPS_OABI32),y)
  40 GLIBC_EXTRA_CFLAGS += -mabi=32
  41 endif
  42
  43 ifeq ($(BR2_ENABLE_DEBUG),y)
  44 GLIBC_EXTRA_CFLAGS += -g
  45 endif
  46
  47 # The stubs.h header is not installed by install-headers, but is
  48 # needed for the gcc build. An empty stubs.h will work, as explained
  49 # in http://gcc.gnu.org/ml/gcc/2002-01/msg00900.html. The same trick
  50 # is used by Crosstool-NG.
  51 ifeq ($(BR2_TOOLCHAIN_BUILDROOT_GLIBC),y)
  52 define GLIBC_ADD_MISSING_STUB_H
  53         mkdir -p $(STAGING_DIR)/usr/include/gnu
  54         touch $(STAGING_DIR)/usr/include/gnu/stubs.h
  55 endef
  56 endif
  57
  58 # Even though we use the autotools-package infrastructure, we have to
  59 # override the default configure commands for several reasons:
  60 #
  61 #  1. We have to build out-of-tree, but we can't use the same
  62 #     'symbolic link to configure' used with the gcc packages.
  63 #
  64 #  2. We have to execute the configure script with bash and not sh.
  65 #
  66 # Note that as mentionned in
  67 # http://patches.openembedded.org/patch/38849/, glibc must be
  68 # built with -O2, so we pass our own CFLAGS and CXXFLAGS below.
  69 define GLIBC_CONFIGURE_CMDS
  70         mkdir -p $(@D)/build
  71         # Do the configuration
  72         (cd $(@D)/build; \
  73                 $(TARGET_CONFIGURE_OPTS) \
  74                 CFLAGS="-O2 $(GLIBC_EXTRA_CFLAGS)" CPPFLAGS="" \
  75                 CXXFLAGS="-O2 $(GLIBC_EXTRA_CFLAGS)" \
  76                 $(SHELL) $(@D)/$(GLIBC_SRC_SUBDIR)/configure \
  77                 ac_cv_path_BASH_SHELL=/bin/bash \
  78                 libc_cv_forced_unwind=yes \
  79                 libc_cv_ssp=no \
  80                 --target=$(GNU_TARGET_NAME) \
  81                 --host=$(GNU_TARGET_NAME) \
  82                 --build=$(GNU_HOST_NAME) \
  83                 --prefix=/usr \
  84                 --enable-shared \
  85                 $(if $(BR2_SOFT_FLOAT),--without-fp,--with-fp) \
  86                 $(if $(BR2_x86_64),--enable-lock-elision) \
  87                 --with-pkgversion="Buildroot" \
  88                 --without-cvs \
  89                 --disable-profile \
  90                 --without-gd \
  91                 --enable-obsolete-rpc \
  92                 --enable-kernel=$(call qstrip,$(BR2_TOOLCHAIN_HEADERS_AT_LEAST)) \
  93                 --with-headers=$(STAGING_DIR)/usr/include)
  94         $(GLIBC_ADD_MISSING_STUB_H)
  95 endef
  96
  97
  98 #
  99 # We also override the install to target commands since we only want
 100 # to install the libraries, and nothing more.
 101 #
 102
 103 GLIBC_LIBS_LIB = \
 104         ld*.so.* libanl.so.* libc.so.* libcrypt.so.* libdl.so.* libgcc_s.so.* \
 105         libm.so.* libnsl.so.* libpthread.so.* libresolv.so.* librt.so.* \
 106         libutil.so.* libnss_files.so.* libnss_dns.so.* libmvec.so.*
 107
 108 ifeq ($(BR2_PACKAGE_GDB),y)
 109 GLIBC_LIBS_LIB += libthread_db.so.*
 110 endif
 111
 112 define GLIBC_INSTALL_TARGET_CMDS
 113         for libs in $(GLIBC_LIBS_LIB); do \
 114                 $(call copy_toolchain_lib_root,$$libs) ; \
 115         done
 116 endef
 117
 118 # MIPS R6 requires to have NaN2008 support which is currently not
 119 # supported by the Linux kernel. In order to prevent building the
 120 # glibc against kernels not having NaN2008 support on platforms that
 121 # requires it, glibc currently checks for an (inexisting) 10.0.0
 122 # kernel headers version.
 123 #
 124 # Since in practice the kernel support for NaN2008 is not really
 125 # required for things to work properly, we adjust the glibc check to
 126 # make it believe that NaN2008 support was added in the kernel
 127 # starting from version 4.0.0.
 128 #
 129 # In general the compatibility issues introduced by mis-matched NaN
 130 # encodings will not cause a problem as signalling NaNs are rarely used
 131 # in average code. For MIPS R6 there isn't actually any compatibility
 132 # issue as the hardware is always NaN2008 and software is always
 133 # NaN2008. The problem only comes from when older MIPS code is linked in
 134 # via a DSO and multiple NaN encodings are introduced. Since Buildroot
 135 # is intended to have all code built from source then this scenario is
 136 # highly unlikely. The failure mode, if it ever occurs, would be either
 137 # that a signalling NaN fails to raise an invalid operation exception or
 138 # (more likely) an ordinary NaN raises an invalid operation exception.
 139 ifeq ($(BR2_MIPS_CPU_MIPS32R6)$(BR2_MIPS_CPU_MIPS64R6),y)
 140 define GLIBC_FIX_MIPS_R6
 141         $(SED) 's#10.0.0#4.0.0#' \
 142                 $(@D)/sysdeps/unix/sysv/linux/mips/configure \
 143                 $(@D)/sysdeps/unix/sysv/linux/mips/configure.ac
 144 endef
 145 GLIBC_POST_EXTRACT_HOOKS += GLIBC_FIX_MIPS_R6
 146 endif
 147
 148 $(eval $(autotools-package))