* [Bug debug/98708] [11 Regression] cxx11-ios_failure-lt.s:36733: Error: file number less than one
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From: hjl.tools at gmail dot com @ 2021-01-17 1:10 UTC (permalink / raw)
To: gcc-bugs
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
CC| |mark at gcc dot gnu.org
Last reconfirmed| |2021-01-17
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
This is with binutils master. I think 2.36 branch may have the same issue.
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From: hjl.tools at gmail dot com @ 2021-01-17 3:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[11 Regression] |[11 Regression]
|cxx11-ios_failure-lt.s:3673 |cxx11-ios_failure-lt.s:3673
|3: Error: file number less |3: Error: file number less
|than one |than one by r11-6755
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
/bin/sh ../../libtool --tag CXX --tag disable-shared --mode=compile
/export/gnu/import/git/gcc-test-master-intel64-native/bld/./gcc/xgcc
-shared-libgcc
-B/export/gnu/import/git/gcc-test-master-intel64-native/bld/./gcc -nostdinc++
-L/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/libstdc++-v3/src
-L/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-L/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-B/usr/11.0.0/x86_64-pc-linux-gnu/bin/ -B/usr/11.0.0/x86_64-pc-linux-gnu/lib/
-isystem /usr/11.0.0/x86_64-pc-linux-gnu/include -isystem
/usr/11.0.0/x86_64-pc-linux-gnu/sys-include -fno-checking
-I/export/gnu/import/git/gcc-test-master-intel64-native/src-master/libstdc++-v3/../libgcc
-I/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-I/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/libstdc++-v3/include
-I/export/gnu/import/git/gcc-test-master-intel64-native/src-master/libstdc++-v3/libsupc++
-std=gnu++11 -prefer-pic -D_GLIBCXX_SHARED -fno-implicit-templates -Wall
-Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -fdiagnostics-show-location=once
-ffunction-sections -fdata-sections -frandom-seed=cxx11-ios_failure.lo -g -O2
-D_GNU_SOURCE -fcf-protection -mshstk -g0 -c cxx11-ios_failure-lt.s -o
cxx11-ios_failure.lo
cxx11-ios_failure-lt.s contains DWARF5 debug info. Since -g0 is used,
--gdwarf-5 isn't passed to assembler:
[hjl@gnu-clx-1 gcc]$ ./xgcc -B./ -c /tmp/cxx11-ios_failure-lt.s
/tmp/cxx11-ios_failure-lt.s: Assembler messages:
/tmp/cxx11-ios_failure-lt.s:36733: Error: file number less than one
[hjl@gnu-clx-1 gcc]$ ./xgcc -B./ -c /tmp/cxx11-ios_failure-lt.s -g
[hjl@gnu-clx-1 gcc]$
This means that "gcc -c" no longer works on assembly codes generated with
-g when DWARF5 is enabled.
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From: hjl.tools at gmail dot com @ 2021-01-17 4:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |11.0
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
The assembler patch is posted at
https://sourceware.org/pipermail/binutils/2021-January/114978.html
GCC should emit ".dwarf_level 5" when generating DWARF5 info.
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From: jakub at gcc dot gnu.org @ 2021-01-17 8:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I guess the primary question is why does it emit any .file directives or
.debug_str when it is compiled with -g -O2 -g0. That seems like the bug.
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To: gcc-bugs
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--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ah, no, the *.s file is generated with -g, but the assembler isn't able to cope
with it.
I'd say that the assembler shouldn't require any directive or flag but just
assemble it.
Anything else seems to be an assembler bug.
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To: gcc-bugs
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--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The assembler has all the information in the assembly, .debug_info section
contains version etc.
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To: gcc-bugs
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--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I'd be for automatic bumping to dwarf5 level if .file 0 is seen, but remember
that it happened and issue an error if .debug_info with version older than 5 is
seen in the file.
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From: mark at gcc dot gnu.org @ 2021-01-17 11:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
--- Comment #8 from Mark Wielaard <mark at gcc dot gnu.org> ---
I am not sure where the -g -O2 -g0 comes from. I must have missed this in my
testing.
The issue is the .file 0 directive, which is special to gas (only valid with
-gdwarf-5).
It is generated by dwarf2out_finish ():
/* Output the source line correspondence table. We must do this
even if there is no line information. Otherwise, on an empty
translation unit, we will generate a present, but empty,
.debug_info section. IRIX 6.5 `nm' will then complain when
examining the file. This is done late so that any filenames
used by the debug_info section are marked as 'used'. */
switch_to_section (debug_line_section);
ASM_OUTPUT_LABEL (asm_out_file, debug_line_section_label);
if (! output_asm_line_debug_info ())
output_line_info (false);
else if (asm_outputs_debug_line_str ())
{
/* When gas outputs DWARF5 .debug_line[_str] then we have to
tell it the comp_dir and main file name for the zero entry
line table. */
const char *comp_dir, *filename0;
comp_dir = comp_dir_string ();
if (comp_dir == NULL)
comp_dir = "";
filename0 = get_AT_string (comp_unit_die (), DW_AT_name);
if (filename0 == NULL)
filename0 = "";
fprintf (asm_out_file, "\t.file 0 ");
output_quoted_string (asm_out_file, remap_debug_filename (comp_dir));
fputc (' ', asm_out_file);
output_quoted_string (asm_out_file, remap_debug_filename (filename0));
fputc ('\n', asm_out_file);
}
So it looks like the asm_outputs_debug_line_str () is wrong:
/* Returns TRUE if we are outputting DWARF5 and the assembler supports
DWARF5 .debug_line tables using .debug_line_str or we generate
it ourselves, except for split-dwarf which doesn't have a
.debug_line_str. */
static bool
asm_outputs_debug_line_str (void)
{
if (dwarf_version >= 5
&& ! output_asm_line_debug_info ()
&& DWARF5_USE_DEBUG_LINE_STR)
return true;
else
{
#if defined(HAVE_AS_GDWARF_5_DEBUG_FLAG) &&
defined(HAVE_AS_WORKING_DWARF_N_FLAG)
return !dwarf_split_debug_info && dwarf_version >= 5;
#else
return false;
#endif
}
}
It probably should check debug_info_level > DINFO_LEVEL_NONE.
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From: jakub at gcc dot gnu.org @ 2021-01-17 12:25 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Bootstrap is fine if one uses older binutils.
The thing is that cxx11-ios_failure* is built by hand first with -g -O2 -S,
then the assembly is modified by a script and then it is assembled, and as
older assemblers would fail miserably on assembling .s file containing
.debug_info etc. with -g (-gdwarf-2 passed to assembler), the assembly is
invoked with -g -O2 -c -g0.
I really think this should be fixed solely on the assembler side, and
if needed, we can add a temporary workaround, I guess compiling
cxx11-ios_failure* with -gno-as-loc-support could fix that.
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From: hjl.tools at gmail dot com @ 2021-01-17 12:40 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jakub Jelinek from comment #9)
> Bootstrap is fine if one uses older binutils.
> The thing is that cxx11-ios_failure* is built by hand first with -g -O2 -S,
> then the assembly is modified by a script and then it is assembled, and as
> older assemblers would fail miserably on assembling .s file containing
> .debug_info etc. with -g (-gdwarf-2 passed to assembler), the assembly is
> invoked with -g -O2 -c -g0.
> I really think this should be fixed solely on the assembler side, and
> if needed, we can add a temporary workaround, I guess compiling
> cxx11-ios_failure* with -gno-as-loc-support could fix that.
Assembler option:
--gdwarf-<N> generate DWARF<N> debugging information. 2 <= <N> <= 5
both accepts and generates DWARF<N> info. This decision is made very early.
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From: mark at gcc dot gnu.org @ 2021-01-17 12:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
--- Comment #11 from Mark Wielaard <mark at gcc dot gnu.org> ---
Aha, now I see in libstdc++-v3/src/c++11/Makefile.am:
if ENABLE_DUAL_ABI
# Rewrite the type info for __ios_failure.
rewrite_ios_failure_typeinfo = sed -e
'/^_*_ZTISt13__ios_failure:/,/_ZTVN10__cxxabiv120__si_class_type_infoE/s/_ZTVN10__cxxabiv120__si_class_type_infoE/_ZTVSt19__iosfail_type_info/'
cxx11-ios_failure-lt.s: cxx11-ios_failure.cc
$(LTCXXCOMPILE) -S $< -o tmp-cxx11-ios_failure-lt.s
-test -f tmp-cxx11-ios_failure-lt.o && mv -f tmp-cxx11-ios_failure-lt.o
tmp-cxx11-ios_failure-lt.s
$(rewrite_ios_failure_typeinfo) tmp-$@ > $@
-rm -f tmp-$@
cxx11-ios_failure.s: cxx11-ios_failure.cc
$(CXXCOMPILE) -S $< -o tmp-$@
$(rewrite_ios_failure_typeinfo) tmp-$@ > $@
-rm -f tmp-$@
cxx11-ios_failure.lo: cxx11-ios_failure-lt.s
$(LTCXXCOMPILE) -g0 -c $< -o $@
cxx11-ios_failure.o: cxx11-ios_failure.s
$(CXXCOMPILE) -g0 -c $<
endif
Then my workaround of checking for debug_info_level > DINFO_LEVEL_NONE indeed
wouldn't work. It is explicitly generating debuginfo for the assembly file and
then adding -g0 when turning the assembly file into an object file. So that is
too late.
I don't think adding -gno-as-loc-support to the -S invocation will work because
of the definition of asm_outputs_debug_line_str () which is true if
dwarf_version >= 5 && ! output_asm_line_debug_info () &&
DWARF5_USE_DEBUG_LINE_STR. So then it will still generate the .file 0
directive.
Ideally gas wouldn't error on .file 0, but simply ignore it when not generating
DWARF5.
Maybe the simplest workaround for now would be also adding -g0 to the -S
invocations?
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From: mark at gcc dot gnu.org @ 2021-01-17 13:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
--- Comment #12 from Mark Wielaard <mark at gcc dot gnu.org> ---
On the binutils gas side it could be as simple as turning the error into a
warning:
diff --git a/gas/dwarf2dbg.c b/gas/dwarf2dbg.c
index a428370ecca..a216bfd6b28 100644
--- a/gas/dwarf2dbg.c
+++ b/gas/dwarf2dbg.c
@@ -1044,7 +1044,7 @@ dwarf2_directive_filename (void)
if ((offsetT) num < 1 && DWARF2_LINE_VERSION < 5)
{
- as_bad (_("file number less than one"));
+ as_warn (_("file number less than one, ignored"));
ignore_rest_of_line ();
return NULL;
}
@@ -1143,7 +1143,8 @@ dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED)
{
if (filenum != 0 || DWARF2_LINE_VERSION < 5)
{
- as_bad (_("file number less than one"));
+ as_warn (_("file number less than one, ignored"));
+ ignore_rest_of_line ();
return;
}
}
diff --git a/gas/testsuite/gas/lns/lns-diag-1.l
b/gas/testsuite/gas/lns/lns-diag-1.l
index 1256e85cfcb..d8aa84d9d1a 100644
--- a/gas/testsuite/gas/lns/lns-diag-1.l
+++ b/gas/testsuite/gas/lns/lns-diag-1.l
@@ -1,5 +1,5 @@
.*: Assembler messages:
-.*:2: Error: file number less than one
+.*:2: Warning: file number less than one, ignored
.*:3: Error: missing string
.*:4: Error: file table slot 1 is already occupied.*
.*:8: Error: unassigned file number 3
@@ -9,7 +9,7 @@
.*:19: Error: bad or irreducible absolute expression
.*:23: Error: isa number less than zero
.*:26: Error: bad or irreducible absolute expression
-.*:26: Error: file number less than one
+.*:26: Warning: file number less than one, ignored
.*:27: Error: bad or irreducible absolute expression
.*:28: Error: unknown .loc sub-directive `frobnitz'
.*:29: Error: unknown .loc sub-directive `frobnitz'
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From: jakub at gcc dot gnu.org @ 2021-01-17 15:57 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
But then it will warn and not do what it was expected to do.
Anyway, I've rebuilt cc1plus (on a box without new binutils) with hacking up
auto-host.h so that it normally emits .file 0 "..." directive, and with
-gno-as-loc-support it doesn't emit it. Will try it soon in a koji build where
it failed.
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From: hjl.tools at gmail dot com @ 2021-01-17 15:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 49986
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49986&action=edit
A patch
How about this assembler patch?
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@ 2021-01-17 16:02 ` jakub at gcc dot gnu.org
2021-01-17 16:22 ` jakub at gcc dot gnu.org
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From: jakub at gcc dot gnu.org @ 2021-01-17 16:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Comment on attachment 49986
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49986
A patch
If that works, that would be great.
I can't easily test it right away, but perhaps you could.
Just compile some other libstdc++ source with -g -O2 -c
on gcc configured against latest binutils, save the *.o file and repeat
with -g -O2 -S + assembly by hand without -g* and compare if the readelf -wl
between the two is identical.
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2021-01-17 16:02 ` jakub at gcc dot gnu.org
@ 2021-01-17 16:22 ` jakub at gcc dot gnu.org
2021-01-18 10:29 ` cvs-commit at gcc dot gnu.org
2021-01-19 13:39 ` jakub at gcc dot gnu.org
17 siblings, 0 replies; 19+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-01-17 16:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And the temporary workaround could be
--- libstdc++-v3/src/c++11/Makefile.am.jj 2021-01-04 10:26:02.067970728
+0100
+++ libstdc++-v3/src/c++11/Makefile.am 2021-01-17 17:20:58.580262364 +0100
@@ -141,12 +141,12 @@ if ENABLE_DUAL_ABI
rewrite_ios_failure_typeinfo = sed -e
'/^_*_ZTISt13__ios_failure:/,/_ZTVN10__cxxabiv120__si_class_type_infoE/s/_ZTVN10__cxxabiv120__si_class_type_infoE/_ZTVSt19__iosfail_type_info/'
cxx11-ios_failure-lt.s: cxx11-ios_failure.cc
- $(LTCXXCOMPILE) -S $< -o tmp-cxx11-ios_failure-lt.s
+ $(LTCXXCOMPILE) -gno-as-loc-support -S $< -o tmp-cxx11-ios_failure-lt.s
-test -f tmp-cxx11-ios_failure-lt.o && mv -f tmp-cxx11-ios_failure-lt.o
tmp-cxx11-ios_failure-lt.s
$(rewrite_ios_failure_typeinfo) tmp-$@ > $@
-rm -f tmp-$@
cxx11-ios_failure.s: cxx11-ios_failure.cc
- $(CXXCOMPILE) -S $< -o tmp-$@
+ $(CXXCOMPILE) -gno-as-loc-support -S $< -o tmp-$@
$(rewrite_ios_failure_typeinfo) tmp-$@ > $@
-rm -f tmp-$@
--- libstdc++-v3/src/c++11/Makefile.in.jj 2020-12-17 02:29:28.734557483
+0100
+++ libstdc++-v3/src/c++11/Makefile.in 2021-01-17 17:21:27.510931383 +0100
@@ -852,12 +852,12 @@ limits.o: limits.cc
$(CXXCOMPILE) -fchar8_t -c $<
@ENABLE_DUAL_ABI_TRUE@cxx11-ios_failure-lt.s: cxx11-ios_failure.cc
-@ENABLE_DUAL_ABI_TRUE@ $(LTCXXCOMPILE) -S $< -o tmp-cxx11-ios_failure-lt.s
+@ENABLE_DUAL_ABI_TRUE@ $(LTCXXCOMPILE) -gno-as-loc-support -S $< -o
tmp-cxx11-ios_failure-lt.s
@ENABLE_DUAL_ABI_TRUE@ -test -f tmp-cxx11-ios_failure-lt.o && mv -f
tmp-cxx11-ios_failure-lt.o tmp-cxx11-ios_failure-lt.s
@ENABLE_DUAL_ABI_TRUE@ $(rewrite_ios_failure_typeinfo) tmp-$@ > $@
@ENABLE_DUAL_ABI_TRUE@ -rm -f tmp-$@
@ENABLE_DUAL_ABI_TRUE@cxx11-ios_failure.s: cxx11-ios_failure.cc
-@ENABLE_DUAL_ABI_TRUE@ $(CXXCOMPILE) -S $< -o tmp-$@
+@ENABLE_DUAL_ABI_TRUE@ $(CXXCOMPILE) -gno-as-loc-support -S $< -o tmp-$@
@ENABLE_DUAL_ABI_TRUE@ $(rewrite_ios_failure_typeinfo) tmp-$@ > $@
@ENABLE_DUAL_ABI_TRUE@ -rm -f tmp-$@
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@ 2021-01-18 10:29 ` cvs-commit at gcc dot gnu.org
2021-01-19 13:39 ` jakub at gcc dot gnu.org
17 siblings, 0 replies; 19+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-01-18 10:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
--- Comment #17 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:2e43880dbd4cb9722ae99708c01c399f985dc7c3
commit r11-6765-g2e43880dbd4cb9722ae99708c01c399f985dc7c3
Author: Jakub Jelinek <jakub@redhat.com>
Date: Mon Jan 18 11:28:17 2021 +0100
libstd++: : Add workaround for as Error: file number less than one error
[PR98708]
As mentioned in the PR, since the switch to DWARF5 by default instead of
DWARF4, gcc fails to build when configured against recent binutils.
The problem is that cxx11-ios_failure* is built in separate steps,
-S compilation (with -g -O2) followed by some sed and followed by
-c -g -O2 -g0 assembly. When gcc is configured against recent binutils
and DWARF5 is the default, we emit .file 0 "..." directive on which the
assembler then fails (unless --gdwarf-5 is passed to it, but we don't want
that generally because on the other side older assemblers don't like -g*
passed to it when invoked on *.s file with compiler generated debug info.
I hope the bug will be fixed soon on the binutils side, but it would be
nice
to have a workaround.
The following patch is one of the possibilities, another one is to do that
but add configure check for whether it is needed,
essentially
echo 'int main () { return 0; }' > conftest.c
${CXX} ${CXXFLAGS} -g -O2 -S conftest.c -o conftest.s
${CXX} ${CXXFLAGS} -g -O2 -g0 -c conftest.s -o conftest.o
and if the last command fails, we need that -gno-as-loc-support.
Or yet another option would be I think do a different check, whether
${CXX} ${CXXFLAGS} -g -O2 -S conftest.c -o conftest.s
${CXX} ${CXXFLAGS} -g -O2 -c conftest.s -o conftest.o
works and if yes, don't add the -g0 to cxx11-ios_failure*.s assembly.
2021-01-18 Jakub Jelinek <jakub@redhat.com>
PR debug/98708
* src/c++11/Makefile.am (cxx11-ios_failure-lt.s,
cxx11-ios_failure.s):
Compile with -gno-as-loc-support.
* src/c++11/Makefile.in: Regenerated.
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2021-01-18 10:29 ` cvs-commit at gcc dot gnu.org
@ 2021-01-19 13:39 ` jakub at gcc dot gnu.org
17 siblings, 0 replies; 19+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-01-19 13:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98708
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Worked around on the gcc side and fixed on the binutils side.
^ permalink raw reply [flat|nested] 19+ messages in thread