https://llvm.org/bugs/show_bug.cgi?id=26751
Bug ID: 26751
Summary: clang-cl: Come up with a way to do the equivalent of
%INCLUDE% via command-line flags
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Driver
Assignee: unassignedclangb...@nondot.org
Reporter: nicolaswe...@gmx.de
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
clang-cl currently supports a bunch of magic env vars, like cl.exe. Passing
things in env vars is messy (for example: if you want to use clang-cl on Linux,
should the env var item separator be : or ;?), so we should have the ability to
do the same with flags.
I thought just exposing -isystem and then passing one -isystem flag per INCLUDE
entry would be enough, but that's sadly not the case:
1. If I misspell the -isystem flag to point to a nonexistent directory, they're
ignored and the "real" system includes are still picked up. -nostdlibinc fixes
that, but clang-cl doesn't expose that. We could expose this flag too, seems
like a good and easy fix.
2. But even then, the -isystem flags are now searched before the built-in
headers, which has the effect of e.g. `#include <stddef.h>` picking up the msvs
header instead of clang's version (and now offsetof is no longer constexpr
etc). I guess one fix for this would be to add an explicit -isystem flag
pointing to clang's builtin header dir, but this is getting a bit ugly.
Does anyone happen to have better suggestions on how to get the exact same
effect as setting %INCLUDE% with flags?
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