Re: fenv.h not found?

[Anthony Foiani <anthony dot foiani at gmail dot com>]

Bryan, Arnaud, et al --


>>> On Tue, Oct 19, 2010 at 10:52 AM, Bryan Hundven <bryanhundven@gmail.com> wrote:
>>>> As I have mentioned, I think that creating and removing the
>>>> ${CT_SYSROOT_DIR}/include symlink is also wrong and suggestive that we
>>>> are forced to create this because we are making a mistake somewhere
>>>> else (binutils? gcc_static/shared_core? libc-startfiles?) and we
>>>> should fix that problem first. I believe that if we can solve that
>>>> problem, the c++ headers issue will go away.

>> On Tue, Oct 19, 2010 at 3:19 PM, Anthony Foiani <anthony.foiani@gmail.com> wrote:
>>> Given that someone (Arnaud?) already traced through the build log and
>>> saw the eglibc "fenv.h" get overwritten by the GCC version, it seems
>>> most likely to be somewhere in the GCC portion of things, presumably
>>> when the final compiler is installed.
>>>
>>> I know I got confused when I was looking at the issue before: he's
>>> correct that the host include files need not (and, arguably, should
>>> not) be present in the target sys-root, but I know we do need to have
>>> the host libraries (libgcc, libstdc++) in the target sys-root.

On Tue, Oct 19, 2010 at 2:49 PM, Bryan Hundven <bryanhundven@gmail.com> wrote:
> So the ${CT_PREFIX_DIR}/${CT_TARGET}/include is created by the final
> g++, and we want these headers in the sysroot?

I think it's the other way around, actually; the final gcc creates the
necessary include files in the sysroot; using a symlink to expose the
sys-root's "/include" directory as a sibling of the ${CT_PREFIX}/bin
directory (where the final cross-compiler lives) seems to fix things.

> The host include files are the ones installed by the "host"
> gcc_core_{static,shared} toolchains, right?

I *believe* so.  (But if I spend much time looking at this stuff, I
begin to think I'm going to be eaten by a grue...)

For whatever it's worth, I've backed out the "with-gxx-includes..."
bit from my local copy of ct-ng, after which the fenv.h examples now
compile (both C and C++).  But it looks like the includes for
libstdc++ have gone missing again:

[tony@whisper tmp]$ strace -f -tt
/opt/cross/platforms/foo/xtools/bin/powerpc-e500v2-linux-gnuspe-g++
 cstddef_check.cpp   -o cstddef_check 2>&1 | grep cstddef
23:49:34.477185
execve("/opt/cross/platforms/foo/xtools/bin/powerpc-e500v2-linux-gnuspe-g++",
["/opt/cross/platforms/foo/"..., "cstddef_check.cpp", "-o",
"cstddef_check"], [/* 68 vars */]) = 0
23:49:34.485089 access("cstddef_check.cpp", F_OK) = 0
[pid 12606] 23:49:34.487424
execve("/opt/cross/platforms/foo/xtools/libexec/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/cc1plus",
["/opt/cross/platforms/foo/"..., "-quiet", "-D_GNU_SOURCE",
"-D__unix__", "-D__gnu_linux__", "-D__linux__", "-Dunix", "-D__unix",
"-Dlinux", "-D__linux", "-Asystem=linux", "-Asystem=unix",
"-Asystem=posix", "cstddef_check.cpp", "-quiet", "-dumpbase", ...],
[/* 71 vars */]) = 0
[pid 12606] 23:49:34.499498 stat("cstddef_check.cpp.gch",
0x7fff0a32ad40) = -1 ENOENT (No such file or directory)
[pid 12606] 23:49:34.499582 open("cstddef_check.cpp", O_RDONLY|O_NOCTTY) = 3
[pid 12606] 23:49:34.499745 read(3, "#include <cstddef>\n\nint main(
in"..., 75) = 75
[pid 12606] 23:49:34.509186
stat("/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/include/cstddef.gch",
0x7fff0a32aa60) = -1 ENOENT (No such file or directory)
[pid 12606] 23:49:34.509263
open("/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/include/cstddef",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
[pid 12606] 23:49:34.509327
stat("/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/include-fixed/cstddef.gch",
0x7fff0a32aa60) = -1 ENOENT (No such file or directory)
[pid 12606] 23:49:34.509389
open("/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/include-fixed/cstddef",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
[pid 12606] 23:49:34.509451
stat("/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/include/cstddef.gch",
0x7fff0a32aa60) = -1 ENOENT (No such file or directory)
[pid 12606] 23:49:34.509509
open("/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/include/cstddef",
O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or directory)
[pid 12606] 23:49:34.509596 write(2, "cstddef_check.cpp:1:19: fatal
er"..., 71cstddef_check.cpp:1:19: fatal error: cstddef: No such file
or directory) = 71
[pid 12606] 23:49:34.509753 write(3,
"\t.file\t\"cstddef_check.cpp\"\n\t.gnu"..., 91) = 91

[tony@whisper tmp]$ find /opt/cross/platforms/foo/xtools/ -type f
-name cstddef -print
/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe/sys-root/usr/include/c++/4.5.1/cstddef

[tony@whisper tmp]$
/opt/cross/platforms/foo/xtools/bin/powerpc-e500v2-linux-gnuspe-g++ -o
fenv_check-cpp fenv_check.cpp -v
Using built-in specs.
COLLECT_GCC=/opt/cross/platforms/foo/xtools/bin/powerpc-e500v2-linux-gnuspe-g++
COLLECT_LTO_WRAPPER=/opt/cross/platforms/foo/xtools/libexec/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/lto-wrapper
Target: powerpc-e500v2-linux-gnuspe
Configured with:
/opt/cross/platforms/foo/xtools-build/src/gcc-4.5.1/configure
--build=x86_64-build_unknown-linux-gnu
--host=x86_64-build_unknown-linux-gnu
--target=powerpc-e500v2-linux-gnuspe
--prefix=/opt/cross/platforms/foo/xtools
--with-sysroot=/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root
--enable-languages=c,c++ --disable-multilib --with-cpu=8548
--with-tune=8548
--with-pkgversion=crosstool-NG-333eafe07ada@20101019T195803Z
--disable-sjlj-exceptions --enable-__cxa_atexit --disable-libmudflap
--disable-libgomp --disable-libssp
--with-gmp=/opt/cross/platforms/foo/xtools-build/powerpc-e500v2-linux-gnuspe/build/static
--with-mpfr=/opt/cross/platforms/foo/xtools-build/powerpc-e500v2-linux-gnuspe/build/static
--with-mpc=/opt/cross/platforms/foo/xtools-build/powerpc-e500v2-linux-gnuspe/build/static
--with-ppl=/opt/cross/platforms/foo/xtools-build/powerpc-e500v2-linux-gnuspe/build/static
--with-cloog=/opt/cross/platforms/foo/xtools-build/powerpc-e500v2-linux-gnuspe/build/static
--with-libelf=/opt/cross/platforms/foo/xtools-build/powerpc-e500v2-linux-gnuspe/build/static
--enable-threads=posix
--with-local-prefix=/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root
--disable-nls --enable-symvers=gnu --enable-c99 --enable-long-long
--enable-e500_double
Thread model: posix
gcc version 4.5.1 (crosstool-NG-333eafe07ada@20101019T195803Z)
COLLECT_GCC_OPTIONS='-o' 'fenv_check-cpp' '-v' '-shared-libgcc'
'-mtune=8548' '-mcpu=8548'
 /opt/cross/platforms/foo/xtools/libexec/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/cc1plus
-quiet -v -D_GNU_SOURCE -D__unix__ -D__gnu_linux__ -D__linux__ -Dunix
-D__unix -Dlinux -D__linux -Asystem=linux -Asystem=unix -Asystem=posix
fenv_check.cpp -quiet -dumpbase fenv_check.cpp -mtune=8548 -mcpu=8548
-auxbase fenv_check -version -o /tmp/ccp68nfb.s
GNU C++ (crosstool-NG-333eafe07ada@20101019T195803Z) version 4.5.1
(powerpc-e500v2-linux-gnuspe)
	compiled by GNU C version 4.4.4 20100630 (Red Hat 4.4.4-10), GMP
version 4.3.2, MPFR version 3.0.0, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/include/c++/4.5.1"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/include/c++/4.5.1/powerpc-e500v2-linux-gnuspe"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/include/c++/4.5.1/backward"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/include"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/include"
#include "..." search starts here:
#include <...> search starts here:
 /opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/include
 /opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/include-fixed
 /opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/include
End of search list.
GNU C++ (crosstool-NG-333eafe07ada@20101019T195803Z) version 4.5.1
(powerpc-e500v2-linux-gnuspe)
	compiled by GNU C version 4.4.4 20100630 (Red Hat 4.4.4-10), GMP
version 4.3.2, MPFR version 3.0.0, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 4e0fb82a04b3e1f39309e7e0a43c517b
COLLECT_GCC_OPTIONS='-o' 'fenv_check-cpp' '-v' '-shared-libgcc'
'-mtune=8548' '-mcpu=8548'
 /opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/bin/as
-me500 -many -V -Qy -o /tmp/ccwIVrbN.o /tmp/ccp68nfb.s
GNU assembler version 2.20.1 (powerpc-e500v2-linux-gnuspe) using BFD
version (GNU Binutils) 2.20.1.20100303
COMPILER_PATH=/opt/cross/platforms/foo/xtools/libexec/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/:/opt/cross/platforms/foo/xtools/libexec/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/:/opt/cross/platforms/foo/xtools/libexec/gcc/powerpc-e500v2-linux-gnuspe/:/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/:/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/:/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/bin/
LIBRARY_PATH=/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/:/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/lib/:/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/lib/
COLLECT_GCC_OPTIONS='-o' 'fenv_check-cpp' '-v' '-shared-libgcc'
'-mtune=8548' '-mcpu=8548'
 /opt/cross/platforms/foo/xtools/libexec/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/collect2
--sysroot=/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root
--eh-frame-hdr -V -Qy -m elf32ppclinux -dynamic-linker /lib/ld.so.1 -o
fenv_check-cpp /opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/lib/crt1.o
/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/lib/crti.o
/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/crtbegin.o
-L/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1
-L/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/lib
-L/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/lib
/tmp/ccwIVrbN.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/crtend.o
/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/usr/lib/crtn.o
GNU ld (GNU Binutils) 2.20.1.20100303
  Supported emulations:
   elf32ppclinux
   elf32ppc
   elf32ppcsim

These lines are particularly interesting:

ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/include/c++/4.5.1"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/include/c++/4.5.1/powerpc-e500v2-linux-gnuspe"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/include/c++/4.5.1/backward"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/include"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/lib/gcc/powerpc-e500v2-linux-gnuspe/4.5.1/../../../../powerpc-e500v2-linux-gnuspe/include"

Collapsing those ".."s, we get:

ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe/include/c++/4.5.1"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe/include/c++/4.5.1/powerpc-e500v2-linux-gnuspe"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe/include/c++/4.5.1/backward"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe//sys-root/include"
ignoring nonexistent directory
"/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe/include"

Recall that the libstdc++ headers got installed here:

[tony@whisper tmp]$ find /opt/cross/platforms/foo/xtools/ -type f
-name cstddef -print
/opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe/sys-root/usr/include/c++/4.5.1/cstddef

So it seems that headers for libstdc++ get installed into the sysroot
(where they are probably not needed), rather than in the cross-compile
directory itself.

Maybe it's actually a libstdc++ config issue, instead?

Anyway, installing a symlink like so seems to do the trick:

cd /opt/cross/platforms/foo/xtools/powerpc-e500v2-linux-gnuspe
chmod u+w .
ln -s sys-root/usr/include .
chmod u-w

And I think that's about where I was a week or two ago.  :)  At least
I know more now!

Thanks,
Tony

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