https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116671
Bug ID: 116671
Summary: Compiling iostream and string as modules fails if
string is compiled first
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bmlushma at uwaterloo dot ca
Target Milestone: ---
gcc will not compile iostream as a module if string has already been compiled
gcc -v output:
Using built-in specs.
COLLECT_GCC=/usr/local/bin/g++-14.2.0
COLLECT_LTO_WRAPPER=/usr/local/gcc-14.2.0/libexec/gcc/x86_64-linux-gnu/14.2.0/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ./configure -v --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--prefix=/usr/local/gcc-14.2.0 --enable-checking=release
--enable-languages=c,c++ --disable-multilib --program-suffix=-14.2.0
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.2.0 (GCC)
Exact command line:
/usr/local/bin/g++-14.2.0 -std=c++20 -fmodules-ts -c -x c++-system-header
string
/usr/local/bin/g++-14.2.0 -std=c++20 -fmodules-ts -c -x c++-system-header
iostream
Output:
In file included from
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.h:883,
from
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/ios_base.h:41,
from /usr/local/gcc-14.2.0/include/c++/14.2.0/ios:44,
from /usr/local/gcc-14.2.0/include/c++/14.2.0/ostream:40,
from /usr/local/gcc-14.2.0/include/c++/14.2.0/iostream:41:
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.tcc: In function
‘const _Facet* std::__try_use_facet(const locale&)’:
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.tcc:108:7: error:
template argument 3 is invalid
108 | _GLIBCXX_STD_FACET(codecvt<char, char, mbstate_t>);
| ^~~~~~~~~~~~~~~~~~
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.tcc:108:7: error:
expected primary-expression before ‘)’ token
108 | _GLIBCXX_STD_FACET(codecvt<char, char, mbstate_t>);
| ^~~~~~~~~~~~~~~~~~
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.tcc:123:7: error:
template argument 3 is invalid
123 | _GLIBCXX_STD_FACET(codecvt<wchar_t, char, mbstate_t>);
| ^~~~~~~~~~~~~~~~~~
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.tcc:123:7: error:
expected primary-expression before ‘)’ token
123 | _GLIBCXX_STD_FACET(codecvt<wchar_t, char, mbstate_t>);
| ^~~~~~~~~~~~~~~~~~
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.tcc:135:7: error:
template argument 3 is invalid
135 | _GLIBCXX_STD_FACET(codecvt<char16_t, char, mbstate_t>);
| ^~~~~~~~~~~~~~~~~~
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.tcc:135:7: error:
expected primary-expression before ‘)’ token
135 | _GLIBCXX_STD_FACET(codecvt<char16_t, char, mbstate_t>);
| ^~~~~~~~~~~~~~~~~~
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.tcc:136:7: error:
template argument 3 is invalid
136 | _GLIBCXX_STD_FACET(codecvt<char32_t, char, mbstate_t>);
| ^~~~~~~~~~~~~~~~~~
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_classes.tcc:136:7: error:
expected primary-expression before ‘)’ token
136 | _GLIBCXX_STD_FACET(codecvt<char32_t, char, mbstate_t>);
| ^~~~~~~~~~~~~~~~~~
In file included from
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/locale_facets.h:39,
from
/usr/local/gcc-14.2.0/include/c++/14.2.0/bits/basic_ios.h:37,
from /usr/local/gcc-14.2.0/include/c++/14.2.0/ios:46:
/usr/local/gcc-14.2.0/include/c++/14.2.0/cwctype: At global scope:
/usr/local/gcc-14.2.0/include/c++/14.2.0/cwctype:84:11: error: ‘typedef
unsigned int wint_t’ conflicts with a previous declaration
84 | using ::wint_t;
| ^~~~~~
‘
/usr/local/gcc-14.2.0/include/c++/14.2.0/cwctype:84: confused by earlier
errors, bailing out
