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| author | Jakub Jelinek <jakub@redhat.com> | 2021-01-18 11:28:17 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2021-01-18 11:29:26 +0100 |
| commit | 2e43880dbd4cb9722ae99708c01c399f985dc7c3 (patch) | |
| tree | 946af3257ca35779b5f1e5dbdb2b3a03ad69fa3b | |
| parent | 0f951b3dd34b355579b4c9a9e287d32ac771bc67 (diff) | |
| download | gcc-2e43880dbd4cb9722ae99708c01c399f985dc7c3.zip gcc-2e43880dbd4cb9722ae99708c01c399f985dc7c3.tar.gz gcc-2e43880dbd4cb9722ae99708c01c399f985dc7c3.tar.bz2 | |
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.
| -rw-r--r-- | libstdc++-v3/src/c++11/Makefile.am | 4 | ||||
| -rw-r--r-- | libstdc++-v3/src/c++11/Makefile.in | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/libstdc++-v3/src/c++11/Makefile.am b/libstdc++-v3/src/c++11/Makefile.am index 7e4bc66..a26903d 100644 --- a/libstdc++-v3/src/c++11/Makefile.am +++ b/libstdc++-v3/src/c++11/Makefile.am @@ -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 $< -o tmp-$@ $(rewrite_ios_failure_typeinfo) tmp-$@ > $@ -rm -f tmp-$@ diff --git a/libstdc++-v3/src/c++11/Makefile.in b/libstdc++-v3/src/c++11/Makefile.in index ae3a2fd..8654050 100644 --- a/libstdc++-v3/src/c++11/Makefile.in +++ b/libstdc++-v3/src/c++11/Makefile.in @@ -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@ $(rewrite_ios_failure_typeinfo) tmp-$@ > $@ @ENABLE_DUAL_ABI_TRUE@ -rm -f tmp-$@ |