https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117658
Bug ID: 117658
Summary: Different behavior between header file and
module:invalid 'static_cast' from type 'const char
[20]' to type 'no_cvref_t' {aka 'char [20]'}
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: accelerator0099 at gmail dot com
Target Milestone: ---
Created attachment 59621
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59621&action=edit
Sources and script
Commit: 45a3277149d95a51cf9109cab87ee39a7dce73e2
Target: x86_64-pc-linux-gnu
Configured with: /home/aleck099/git/gcc/configure
--prefix=/tmp/x86_64-pc-linux-gnu --disable-nls --disable-werror
--enable-languages=c,c++ --enable-multilib --disable-bootstrap
--disable-libstdcxx-verbose --enable-libstdcxx-static-eh-pool
--with-libstdcxx-eh-pool-obj-count=0 --disable-sjlj-exceptions
--enable-libstdcxx-threads --enable-libstdcxx-backtrace
reproduce with:
$ sh reproduce.sh
In legacy we use header files, main2.cc #include fast_io.ii, and everything
compiles well.
Now we use modules, create fast_io.cc, export some functions from fast_io.ii
and use them in main.cc, it suddenly produces:
error: invalid 'static_cast' from type 'const char [20]' to type 'no_cvref_t'
{aka 'char [20]'}
53 | return static_cast<no_cvref_t>(t);
The type of variable t should be fast_io::basic_io_scatter_t<char>>, however it
becomes const char[20] when we use modules
