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patches/gcc/3.3.2/gcc-3.3-libstdc++-v3-dg.exp.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun May 20 13:48:26 2007 +0000 (2007-05-20)
changeset 112 ea15433daba0
permissions -rw-r--r--
Ah! I finally have a progress bar that doesn't stall the build!
- pipe size in Linux is only 8*512=4096 bytes
- pipe size is not setable
- when the feeding process spits out data faster than the eating
process can read it, then the feeding process stalls after 4KiB
of data sent to the pipe
- for us, the progress bar would spawn a sub-shell every line,
and the sub-shell would in turn spawn a 'date' command.
Which was sloooww as hell, and would cause some kind of a
starvation: the pipe was full most of the time, and the
feeding process was stalled all this time.

Now, we use internal variables and a little hack based onan offset
to determine the elapsed time. Much faster this way, but still
CPU-intensive. 
     1 Without this patch, the command

     2 

     3 RUNTESTFLAGS=--target=powerpc-750-linux-gnu -v -v -v -v make check-target-libstdc++-v3

     4 

     5 fails in two ways:

     6 1. the -L option meant to locate the testsuite directory is incorrect, and

     7 2. the wrong compiler is invoked, causing all sorts of havoc, not least of which

     8 is the native compiler is invoked when we really wanted to invoke the cross-compiler

     9 we just built.

    10 

    11 Here's an example log of the problem in action.  Every testcase fails, this shows just one:

    12 -------------

    13 Invoking the compiler as g++ -ggdb3 -DDEBUG_ASSERT -I/home3/dank/wk/ixos/dap_interim/linux/3rdParty/crosstool/crosstool-0.12/build/powerpc-750-linux-gnu/gcc-3.3-glibc-2.2.5/gcc-3.3/libstdc++-v3/testsuite /home3/dank/wk/ixos/dap_interim/linux/3rdParty/crosstool/crosstool-0.12/build/powerpc-750-linux-gnu/gcc-3.3-glibc-2.2.5/gcc-3.3/libstdc++-v3/testsuite/20_util/binders.cc   -g -O2 -DDEBUG_ASSERT  -L/testsuite -lv3test -lm  -o ./binders.exe

    14 compiler exited with status 1

    15 output is:

    16 /usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/stl_function.h: In method `void binder2nd<mem_fun1_ref_t<void,Elem,int> >::operator ()(const Elem &) const':^M

    17 /usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/stl_algo.h:83:   instantiated from `for_each<Elem *, binder2nd<mem_fun1_ref_t<void,Elem,int> > >(Elem *, Elem *, binder2nd<mem_fun1_ref_t<void,Elem,int> >)'^M

    18 /home3/dank/wk/ixos/dap_interim/linux/3rdParty/crosstool/crosstool-0.12/build/powerpc-750-linux-gnu/gcc-3.3-glibc-2.2.5/gcc-3.3/libstdc++-v3/testsuite/20_util/binders.cc:43:   instantiated from here^M

    19 /usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/stl_function.h:224: conversion from `const Elem' to `Elem &' discards qualifiers^M

    20 /usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/stl_function.h:622: in passing argument 1 of `mem_fun1_ref_t<void,Elem,int>::operator ()(Elem &, int) const'^M

    21 ...

    22 FAIL: 20_util/binders.cc (test for excess errors)

    23 WARNING: 20_util/binders.cc compilation failed to produce executable

    24 -------------

    25 

    26 And here's the patch.  I'm not happy with it, and it probably gets some cases wrong,

    27 but it seems to work for the common native case and for my cross-compiler case.

    28 

    29 --- gcc-3.3/libstdc++-v3/testsuite/lib/libstdc++-v3-dg.exp.old	Sun Jul 13 10:42:01 2003

    30 +++ gcc-3.3/libstdc++-v3/testsuite/lib/libstdc++-v3-dg.exp	Sun Jul 13 11:39:54 2003

    31 @@ -46,8 +46,23 @@

    32      global gluefile wrap_flags

    33      global ld_library_path

    34      global tool_root_dir

    35 +    global target_triplet

    36  

    37      set blddir [lookfor_file [get_multilibs] libstdc++-v3]

    38 +    if { $blddir == "" } {

    39 +        set multilibs [get_multilibs]

    40 +        # FIXME: assume multilib only one level deep

    41 +        set multisub [file tail $multilibs]

    42 +        verbose "libstdc++-v3-init: couldn't find libstdc++-v3 in $multilibs, trying $objdir"

    43 +        set blddir [lookfor_file ${objdir} "$target_triplet/$multisub/libstdc++-v3"]

    44 +    }

    45 +    if { $blddir == "" } {

    46 +        verbose "libstdc++-v3-init: couldn't find libstdc++-v3, trying $objdir without multilibs"

    47 +        set blddir [lookfor_file ${objdir} "$target_triplet/libstdc++-v3"]

    48 +    }

    49 +    if { $blddir == "" } {

    50 +         error "Can't find libstdc++-v3"

    51 +    }

    52  

    53      # By default, we assume we want to run program images.

    54      global dg-do-what-default
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