[llvm-bugs] [Bug 34661] New: Please support #pragma clang target
llvm-bugs at lists.llvm.org
Mon Sep 18 12:05:28 PDT 2017
Bug ID: 34661
Summary: Please support #pragma clang target
OS: Windows NT
Assignee: unassignedclangbugs at nondot.org
Reporter: myriachan at gmail.com
CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
If you want to write an application that automatically uses extended intrinsics
if the processor supports them, you have to compile multiple source files with
differing target command-line options. This works at a basic level.
There's one major problem, though: if you have inline or template functions in
header files, the compiler will be free to generate code using the extended
features for these functions. If you're unlucky at link time, the linker will
choose the copy of these functions that use the extended processor features,
causing a crash when they don't exist.
GCC solves this by having pragmas (using the "basic" x86-64 as an example):
#pragma GCC push_options
#pragma GCC target "arch=k8"
#pragma GCC pop_options
Could a #pragma clang target be added for similar purposes?
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