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Tom de Vries 3d5afab339 [gdb/symtab] Don't create duplicate psymtab for forward-imported CU
Consider the executable generated for test-case gdb.dwarf2/imported-unit.exp.

When loading the executable using various tracing:
...
$ gdb \
  outputs/gdb.dwarf2/imported-unit/imported-unit \
  -batch \
  -iex "set verbose on" \
  -iex "set debug symtab-create 1"
  ...
Created psymtab 0x213f380 for module <artificial>@0xc7.
Created psymtab 0x20e7b00 for module imported_unit.c.
Created psymtab 0x215da20 for module imported_unit.c.
Created psymtab 0x2133630 for module elf-init.c.
Created psymtab 0x215b910 for module ../sysdeps/x86_64/crtn.S.
...
we notice that there are two psymtabs generated for imported_unit.c.

This is due to the following: in dwarf2_build_psymtabs_hard we loop over CUs
and generate partial symtabs for those, and if we encounter an import of
another CU, we also generate a partial symtab for that one, unless already
created.

This works well with backward import references:
- the imported CU is read
- then the importing CU is read
- the import is encountered, but the imported CU is already read, so
  we're done.

But with forward import references, we have instead:
- the importing CU is read
- the import is encountered, and the imported CU is read
- the imported CU is read once more

Fix this by skipping already created psymtabs in the loop in
dwarf2_build_psymtabs_hard.

Tested on x86_64-linux, with native and target board
unix/-flto/-O0/-flto-partition=none/-ffat-lto-objects.

This causes this regression with the target board:
...
FAIL: gdb.ada/dgopt.exp: list x.adb:16, 16
...
which I consider a seperate PR, filed as PR25801 - "Filename of shared psymtab
is ignored".

gdb/ChangeLog:

2020-04-22  Tom de Vries  <tdevries@suse.de>

	PR symtab/25700
	* dwarf2/read.c (dwarf2_build_psymtabs_hard): Don't create psymtab for
	CU if already created.

gdb/testsuite/ChangeLog:

2020-04-22  Tom de Vries  <tdevries@suse.de>

	PR symtab/25700
	* gdb.dwarf2/imported-unit.exp: Verify that there's only one partial
	symtab for imported_unit.c.
2020-04-22 08:09:45 +02:00
bfd Automatic date update in version.in 2020-04-22 00:00:10 +00:00
binutils fix typo last commit 2020-04-20 12:01:47 +09:30
config Merge changes from GCC for the config/ directory 2020-02-19 17:51:24 +00:00
contrib contrib: Update dg-extract-results.* from gcc 2019-10-21 15:26:48 +01:00
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elfcpp Add markers for 2.34 branch to the NEWS files and ChangeLogs. 2020-01-18 13:50:25 +00:00
etc texi2pod.pl: import support for @t{...} from gcc 2020-01-15 12:58:09 -05:00
gas symver11.s: Add ".balign 8" 2020-04-21 18:21:56 -07:00
gdb [gdb/symtab] Don't create duplicate psymtab for forward-imported CU 2020-04-22 08:09:45 +02:00
gdbserver Fix Cygwin gdb build 2020-04-16 07:24:57 -06:00
gdbsupport Mark move constructors as "noexcept" 2020-04-20 11:45:06 -06:00
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ChangeLog Since the pdp11-aout target does not support gdb, gdbserver or gprof these should be excluded in configure. 2020-04-21 10:27:50 +01:00
MAINTAINERS Move gdbserver to top level 2020-02-07 08:42:25 -07:00
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README
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compile Update from upstream Automake 2014-11-16 13:43:48 +01:00
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configure Since the pdp11-aout target does not support gdb, gdbserver or gprof these should be excluded in configure. 2020-04-21 10:27:50 +01:00
configure.ac Since the pdp11-aout target does not support gdb, gdbserver or gprof these should be excluded in configure. 2020-04-21 10:27:50 +01:00
depcomp Update from upstream Automake 2014-11-16 13:43:48 +01:00
djunpack.bat
install-sh Update from upstream Automake 2014-11-16 13:43:48 +01:00
libtool.m4 Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
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missing Update from upstream Automake 2014-11-16 13:43:48 +01:00
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move-if-change Update `move-if-change' from gnulib 2014-11-16 17:04:02 +01:00
multilib.am Merge autoconf / automake update changes from GCC. 2018-10-31 17:10:56 +00:00
setup.com
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