yann@402: See http://gcc.gnu.org/PR22541
yann@402: 
yann@402: From: Dan Kegel
yann@402: 
yann@402: When building gcc-3.4.3 or gcc-4.x into a clean $PREFIX,
yann@402: the configure script happily copies the glibc include files from include to sys-include;
yann@402: here's the line from the log file (with $PREFIX instead of the real prefix):
yann@402: 
yann@402: Copying $PREFIX/i686-unknown-linux-gnu/include to $PREFIX/i686-unknown-linux-gnu/sys-include
yann@402: 
yann@402: But later, when running fixincludes, it gives the error message
yann@402:  The directory that should contain system headers does not exist:
yann@402:   $PREFIX/lib/gcc/i686-unknown-linux-gnu/3.4.3/../../../../i686-unknown-linux-gnu/sys-include
yann@402: 
yann@402: Nevertheless, it continues building; the header files it installs in
yann@402:  $PREFIX/lib/gcc/i686-unknown-linux-gnu/3.4.3/include
yann@402: do not include the boilerplate that would cause it to #include_next the
yann@402: glibc headers in the system header directory.
yann@402: Thus the resulting toolchain can't compile the following program:
yann@402: #include <limits.h>
yann@402: int x = PATH_MAX;
yann@402: because its limits.h doesn't include the glibc header.
yann@402: 
yann@402: The problem is that gcc/Makefile.in assumes that
yann@402: it can refer to $PREFIX/i686-unknown-linux-gnu  with the path
yann@402:                 $PREFIX/lib/../i686-unknown-linux-gnu, but
yann@402: that fails because the directory $PREFIX/lib doesn't exist during 'make all';
yann@402: it is only created later, during 'make install'.  (Which makes this problem
yann@402: confusing, since one only notices the breakage well after 'make install',
yann@402: at which point the path configure complained about does exist, and has the
yann@402: right stuff in it.)
yann@402: 
yann@402: A fix that I've been using for a while is to use sed to canonicalize
yann@402: the path.  The sed syntax is a bit obtuse, but it works. 
yann@402: 
yann@402: (hey, that's the first time I've ever used a label in a sed script; thanks to the sed faq
yann@402: for explaining the :a ... ta method of looping to repeat a search-and-replace until it doesn't match.)
yann@402: 
yann@402: [rediffed against gcc-4.1-20060210]
yann@402: 
yann@402: --- gcc-4.1-20060210/gcc/Makefile.in.old	2006-01-11 06:29:29.000000000 -0800
yann@402: +++ gcc-4.1-20060210/gcc/Makefile.in	2006-02-14 16:08:54.000000000 -0800
yann@402: @@ -388,7 +388,10 @@
yann@402:  CROSS_SYSTEM_HEADER_DIR = @CROSS_SYSTEM_HEADER_DIR@
yann@402:  
yann@402:  # autoconf sets SYSTEM_HEADER_DIR to one of the above.
yann@402: -SYSTEM_HEADER_DIR = @SYSTEM_HEADER_DIR@
yann@402: +# Purge it of unneccessary internal relative paths
yann@402: +# to directories that might not exist yet.
yann@402: +# The sed idiom for this is to repeat the search-and-replace until it doesn't match, using :a ... ta.
yann@402: +SYSTEM_HEADER_DIR = `echo @SYSTEM_HEADER_DIR@ | sed -e :a -e "s,[^/]*/\.\.\/,," -e ta`
yann@402:  
yann@402:  # Control whether to run fixproto and fixincludes.
yann@402:  STMP_FIXPROTO = @STMP_FIXPROTO@
yann@402: @@ -3167,13 +3170,15 @@
yann@402:  ../$(build_subdir)/fixincludes/fixincl: ; @ :
yann@402:  
yann@402:  # Build fixed copies of system files.
yann@402: +# Abort if no system headers available, unless building a crosscompiler.
yann@402: +# Canonicalize $gcc_tooldir/sys-include in same way as $SYSTEM_HEADER_DIR was canonicalized so test still works
yann@402:  stmp-fixinc: gsyslimits.h macro_list \
yann@402:    $(build_objdir)/fixincludes/fixincl \
yann@402:    $(build_objdir)/fixincludes/fixinc.sh
yann@402:  	@if ! $(inhibit_libc) && test ! -d ${SYSTEM_HEADER_DIR}; then \
yann@402:  	  echo The directory that should contain system headers does not exist: >&2 ; \
yann@402:  	  echo "  ${SYSTEM_HEADER_DIR}" >&2 ; \
yann@402: -	  if test "x${SYSTEM_HEADER_DIR}" = "x${gcc_tooldir}/sys-include"; \
yann@402: +	  if test "x${SYSTEM_HEADER_DIR}" = "x`echo "${gcc_tooldir}/sys-include" | sed -e :a -e "s,[^/]*/\.\.\/,," -e ta`"; \
yann@402:  	  then sleep 1; else exit 1; fi; \
yann@402:  	fi
yann@402:  	rm -rf include; mkdir include