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71 lines
3.4 KiB
Diff
71 lines
3.4 KiB
Diff
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See http://gcc.gnu.org/PR22541
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From: Dan Kegel
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When building gcc-3.4.3 or gcc-4.0.0 as a cross into a clean $PREFIX
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(the only two I've tried like this), the configure script happily copies
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the glibc include files from include to sys-include; here's the line
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from the log file (with $PREFIX instead of the real prefix):
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Copying $PREFIX/i686-unknown-linux-gnu/include to $PREFIX/i686-unknown-linux-gnu/sys-include
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But later, when running fixincludes, it gives the error message
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The directory that should contain system headers does not exist:
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$PREFIX/lib/gcc/i686-unknown-linux-gnu/3.4.3/../../../../i686-unknown-linux-gnu/sys-include
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Nevertheless, it continues building; the header files it installs in
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$PREFIX/lib/gcc/i686-unknown-linux-gnu/3.4.3/include
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do not include the boilerplate that would cause it to #include_next the
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glibc headers in the system header directory.
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Thus the resulting toolchain can't compile the following program:
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#include <limits.h>
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int x = PATH_MAX;
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because its limits.h doesn't include the glibc header.
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That's not nice. I suspect the problem is that gcc/Makefile.in assumes that
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it can refer to $PREFIX/i686-unknown-linux-gnu with the path
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$PREFIX/lib/../i686-unknown-linux-gnu, but
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that fails because the directory $PREFIX/lib doesn't exist during 'make all';
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it is only created later, during 'make install'. (Which makes this problem
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confusing, since one only notices the breakage well after 'make install',
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at which point the path configure complained about does exist, and has the
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right stuff in it.)
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A possible fix is to replace the line in gcc/Makefile.in that says
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SYSTEM_HEADER_DIR = @SYSTEM_HEADER_DIR@
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with a version that gets rid of extra ..'s, e.g.
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SYSTEM_HEADER_DIR = `echo @SYSTEM_HEADER_DIR@ | sed -e :a -e "s,[^/]*/\.\.\/,,;ta"`
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(hey, that's the first time I've ever used a label in a sed script; thanks to the sed faq
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for explaining the :a ... ta method of looping to repeat a search-and-replace until it doesn't match.)
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--- gcc-3.4.3/gcc/Makefile.in.foo 2005-05-20 11:41:39.000000000 -0700
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+++ gcc-3.4.3/gcc/Makefile.in 2005-05-20 12:08:46.000000000 -0700
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@@ -350,7 +350,10 @@
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CROSS_SYSTEM_HEADER_DIR = @CROSS_SYSTEM_HEADER_DIR@
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# autoconf sets SYSTEM_HEADER_DIR to one of the above.
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-SYSTEM_HEADER_DIR = @SYSTEM_HEADER_DIR@
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+# Purge it of unneccessary internal relative paths
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+# to directories that might not exist yet.
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+# The sed idiom for this is to repeat the search-and-replace until it doesn't match, using :a ... ta.
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+SYSTEM_HEADER_DIR = `echo @SYSTEM_HEADER_DIR@ | sed -e :a -e "s,[^/]*/\.\.\/,," -e ta`
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# Control whether to run fixproto and fixincludes.
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STMP_FIXPROTO = @STMP_FIXPROTO@
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@@ -2532,11 +2535,13 @@
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$(SHELL) ${srcdir}/mkinstalldirs $(DESTDIR)$(gcc_tooldir)
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# Build fixed copies of system files.
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+# Abort if no system headers available, unless building a crosscompiler.
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+# FIXME: abort unless building --without-headers would be more accurate and less ugly
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stmp-fixinc: fixinc.sh gsyslimits.h
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@if test ! -d ${SYSTEM_HEADER_DIR}; then \
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echo The directory that should contain system headers does not exist: >&2 ; \
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echo " ${SYSTEM_HEADER_DIR}" >&2 ; \
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- if test "x${SYSTEM_HEADER_DIR}" = "x${gcc_tooldir}/sys-include"; \
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+ if test "x${SYSTEM_HEADER_DIR}" = "x`echo "${gcc_tooldir}/sys-include" | sed -e :a -e "s,[^/]*/\.\.\/,," -e ta`"; \
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then sleep 1; else exit 1; fi; \
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fi
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rm -rf include; mkdir include
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