Commit 51f5f627 authored by Peter Korsgaard's avatar Peter Korsgaard
Browse files

External toolchain support improvements 



Improve external toolchain support

 * Do not put kernel-headers in the dependencies of BASE_TARGETS in
   the case where BR2_TOOLCHAIN_SOURCE is not y. The kernel headers
   are already supposed to be part of the external toolchain, so
   there's no need to download, extract and install them.

 * In the configuration system, don't display the kernel headers
   version selection list when an external toolchain is selected. This
   is implemented by moving the source
   "toolchain/kernel-headers/Config.in" inside the if
   BR2_TOOLCHAIN_SOURCE in toolchain/Config.in.2.

 * Change the description and help message of the BR2_LARGEFILE,
   BR2_INET_IPV6, BR2_INET_RPC, and BR2_SOFT_FLOAT option in
   toolchain/external-toolchain/Config.in. In the case of an external
   toolchain, the semantic of these options is not to enable large
   file support, IPV6 or RPC (since the toolchain is already compiled,
   it has been decided previously). Their semantic is to let Buildroot
   know about the characteristics of the external toolchain being
   used.

   As an improvement, we could guess these values automatically:

    - for BR2_LARGEFILE, look at the value of __UCLIBC_HAS_LFS__ in
      bits/uClibc_config.h in the libc headers directory.

    - for BR2_INET_RPC, look at the value of __UCLIBC_HAS_RPC__ in the
      same file

    - for BR2_INET_IPV6, look at the value of __UCLIBC_HAS_IPV6__ in
      the same file

    - for BR2_SOFT_FLOAT, look at the output of $(CC) -v 2>&1 | grep
      -- "--with-float=soft"

   But I'm not sure how this would be possible, since these values are
   used at configuration-time by other configuration options, not only
   at build time.

Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
parent 9373bd5d

Makefile

+1 −1
Original line number Diff line number Diff line
@@ -202,7 +202,7 @@ PREFERRED_LIB_FLAGS:=--enable-static --enable-shared 
ifeq ($(BR2_TOOLCHAIN_SOURCE),y)

BASE_TARGETS:=uclibc-configured binutils cross_compiler uclibc-target-utils kernel-headers

else

BASE_TARGETS:=uclibc kernel-headers

BASE_TARGETS:=uclibc

endif

TARGETS:=

toolchain/Config.in.2

+1 −2
Original line number Diff line number Diff line 
#



source "toolchain/kernel-headers/Config.in"



if BR2_TOOLCHAIN_SOURCE

source "toolchain/kernel-headers/Config.in"

source "toolchain/uClibc/Config.in"

source "toolchain/binutils/Config.in"

source "toolchain/gcc/Config.in"

toolchain/external-toolchain/Config.in

+10 −13
Original line number Diff line number Diff line
@@ -69,32 +69,29 @@ choice 
endchoice



config BR2_LARGEFILE

	bool "Enable large file (files > 2 GB) support?"

	bool "Toolchain supports large files (> 2 GB) ?"

	depends on !BR2_cris

	default y

	help

	  Enable large file (files > 2 GB) support

	  Set this option if the external toolchain supports large

	  files (> 2 GB)





config BR2_INET_IPV6

	bool "Enable IPv6"

	bool "Toolchain supports IPv6 ?"

	help

	    Enable IPv6.

	  Set this option if the external toolchain supports IPv6.



config BR2_INET_RPC

	bool "Enable RPC"

	bool "Toolchain supports RPC ?"

	help

	    Enable RPC. RPC support is needed for nfs.

	  Set this option if the external toolchain supports RPC.



config BR2_SOFT_FLOAT

	bool "Use software floating point by default"

	bool "Toolchain supports soft float ?"

	depends on BR2_arm || BR2_armeb || BR2_mips || BR2_mipsel || BR2_powerpc

	help

	  If your target CPU does not have a Floating Point Unit (FPU) or a

	  kernel FPU emulator, but you still wish to support floating point

	  functions, then everything will need to be compiled with soft

	  floating point support (-msoft-float).



	  Most people will answer N.

	  Set this option if the external toolchain supports soft float.



config BR2_TARGET_OPTIMIZATION

	string "Target Optimizations"