1769cb478a
$ ./configure --target=i686-w64-mingw32 --with-platform=efi --host=i686-w64-mingw32
[...]
checking if __bss_start is defined by the compiler... no
checking if edata is defined by the compiler... no
checking if _edata is defined by the compiler... no
configure: error: none of __bss_start, edata or _edata is defined
This happens on machines with quite recent ld due to an error:
`edata' referenced in section `.text' of /tmp/cc72w9E4.o: defined in discarded section `.data' of conftest.exe
collect2: error: ld returned 1 exit status
So, we have to tell linker to not discard .data and .edata sections.
The trick comes from ld documentation:
3.6.7 Output Section Discarding
The linker will not normally create output sections with no contents.
This is for convenience when referring to input sections that may or may
not be present in any of the input files. For example:
.foo : { *(.foo) }
will only create a ‘.foo’ section in the output file if there is a
‘.foo’ section in at least one input file, and if the input sections are
not all empty. Other link script directives that allocate space in an
output section will also create the output section. So too will
assignments to dot even if the assignment does not create space, except
for ‘. = 0’, ‘. = . + 0’, ‘. = sym’, ‘. = . + sym’ and ‘. = ALIGN (. !=
0, expr, 1)’ when ‘sym’ is an absolute symbol of value 0 defined in the
script. This allows you to force output of an empty section with ‘. = .’.
This change does not impact generated binaries because the
conf/i386-cygwin-img-ld.sc linker script is used only when
you run configure.
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Robbie Harwood <rharwood@redhat.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'