https://llvm.org/bugs/show_bug.cgi?id=27307
Bug ID: 27307
Summary: clang-cl rejects -fno-delayed-template-parsing
Product: clang
Version: 3.7
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Driver
Assignee: unassignedclangb...@nondot.org
Reporter: sfi...@hotmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
I'm seeing this with Clang/C2 3.7, but I strongly suspect that Clang/LLVM trunk
is equally affected.
This is similar to https://llvm.org/bugs/show_bug.cgi?id=25114 "clang-cl
rejects -fno-ms-compatibility". I want to request maximum strictness from
clang-cl, enabling only actual features like __declspec(dllimport), in order to
keep MSVC's STL headers clean. I recently learned that two-phase lookup is
controlled by a separate option, but clang-cl doesn't understand it:
C:\Temp>type meow.cpp
#include <stdio.h>
void f(int) {
puts("Standard two-phase!");
}
template <typename T> void g(T t) {
f(t);
}
void f(double) {
puts("Microsoft one-phase!");
}
int main() {
g(3.14);
}
C:\Temp>clang-cl /EHsc /nologo /W4 -fno-ms-compatibility meow.cpp && meow
Microsoft one-phase!
C:\Temp>clang-cl /EHsc /nologo /W4 -fno-ms-compatibility
-fno-delayed-template-parsing meow.cpp && meow
clang-cl.exe: warning: ignoring unrecognized command-line option
'-fno-delayed-template-parsing'
clang-cl.exe: warning: argument unused during compilation:
'-fno-delayed-template-parsing'
Microsoft one-phase!
C:\Temp>clang-cl /EHsc /nologo /W4 -fno-ms-compatibility -Xclang
-fno-delayed-template-parsing meow.cpp && meow
error: unknown argument: '-fno-delayed-template-parsing'
As two-phase lookup doesn't affect the ABI, I should be able to request
strictness here.
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