crosstool-ng: patches/gcc/4.2.4/320-libgcc

scripts: fix dumping execution backtrace

Dumping the backtrace has been broken since changeset #652e56d6d35a:
scripts: execute each steps in a subshell

We can spawn sub-sub-shells in some cases.

The way the fault handler works is to dump the backtrace, but to avoid
printing it once for every sub-shell (which could get quite confusing),
it simply exits when it detects that it is being run in a sub-shell,
leaving to the top-level shell the work to dump the backtrace.

Because each step is executed in its own sub-shell, the variable arrays
that contain the step name, the source file and line number, are lost
when exiting the per-step sub-shell.

Hence, the backtrace is currently limited to printing only the top-level
main procedure of the shell.

Fix this thus:
- when dumping the bckatraces for the steps & the functions, remember
it was dumped, and only dump it if it was not already dumped
- at the top-level shell, print the hints

Also, rename the top-level step label.

Reported-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from 4193d6e6a17430a177fa88c287879c2c35e319f3)

     1 Vampirised from:

     2   http://landley.net/hg/aboriginal/file/7e0747a665ab/sources/patches/gcc-core-libgcceh.patch

     4 diff -durN gcc-4.2.2.orig/gcc/mklibgcc.in gcc-4.2.2/gcc/mklibgcc.in

     5 --- gcc-4.2.2.orig/gcc/mklibgcc.in	2006-07-04 22:20:01.000000000 +0200

     6 +++ gcc-4.2.2/gcc/mklibgcc.in	2011-08-31 16:24:03.674690016 +0200

     7 @@ -223,8 +223,8 @@

     8    if [ "$LIBUNWIND" ]; then

     9      libunwind_a=$dir/libunwind.a

    10    fi

    11 +  libgcc_eh_a=$dir/libgcc_eh.a

    12    if [ "$SHLIB_LINK" ]; then

    13 -    libgcc_eh_a=$dir/libgcc_eh.a

    14      libgcc_s_so=$dir/libgcc_s${SHLIB_EXT}

    15      if [ "$LIBUNWIND" ]; then

    16        libunwind_so=$dir/libunwind${SHLIB_EXT}

    17 @@ -889,11 +889,11 @@

    18    echo '	chmod 644'  ${ldir}/libgcov.a

    19    echo '	$(RANLIB_FOR_TARGET)' ${ldir}/libgcov.a

    21 -  if [ "$SHLIB_LINK" ]; then

    22 -    echo '	$(INSTALL_DATA)' ${dir}/libgcc_eh.a ${ldir}/

    23 -    echo '	chmod 644'  ${ldir}/libgcc_eh.a

    24 -    echo '	$(RANLIB_FOR_TARGET)' ${ldir}/libgcc_eh.a

    25 +  echo '	$(INSTALL_DATA)' ${dir}/libgcc_eh.a ${ldir}/

    26 +  echo '	chmod 644'  ${ldir}/libgcc_eh.a

    27 +  echo '	$(RANLIB_FOR_TARGET)' ${ldir}/libgcc_eh.a

    29 +  if [ "$SHLIB_LINK" ]; then

    30      shlib_slibdir_qual=

    31      os_multilib_dir=`$GCC_FOR_TARGET $flags --print-multi-os-directory`

    32      if [ "$os_multilib_dir" != . ]; then

author	"Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
	Tue Dec 13 23:32:39 2011 +0100 (2011-12-13)
branch	1.13
changeset 2847	c0bf2319af08
permissions	-rw-r--r--