https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120160
Bug ID: 120160
Summary: Implicitly import std if stadard library header is
included
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: antoshkka at gmail dot com
Target Milestone: ---
Please add a preprocessor macro that replaces content of the header with
`import std;` if the macro is defined by user.
For example libstdc++-v3/include/std/vector can be changed in the following
way:
#ifndef _GLIBCXX_VECTOR
#define _GLIBCXX_VECTOR 1
#if defined(GLIBCXX_IMPLICIT_MODULES_USE)
import std;
#else
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
... // all the remaining code from <vector>
#endif /* GLIBCXX_IMPLICIT_MODULES_USE */
#endif /* _GLIBCXX_VECTOR */
Motivation:
1. Implicit `import std;` in standard library header would improve compile
times if module std is available.
2. Migration from includes to `import std;` for big projects is not trivial.
The above approach eases that migration
