https://bugs.llvm.org/show_bug.cgi?id=51188
Bug ID: 51188
Summary: lib/clang/13.0.0/include/intrin.h is missing
__readfsdword
Product: libc++
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
While trying to get V8 to compile without requiring windows.h for most
translation units I hit a problem on one build configuration where
__readfsdword is unavailable, despite including intrin.h. This happens when
intrin.h is included from
third_party/llvm-build/Release+Asserts/lib/clang/13.0.0/include/intrin.h.
I cannot reproduce this in a Chromium build but in a V8 stand-alone build it
can be reproduced with these gn args:
is_component_build = true
is_debug = true
symbol_level = 1
target_cpu = "x86"
use_goma = true
v8_enable_backtrace = true
v8_enable_google_benchmark = true
v8_enable_slow_dchecks = true
Many targets fail to build. One example is obj/v8_libbase/strings.obj.
The relevant section of intrin.h seems to be this block which has function
definitions for reading 1, 8, and 2 bytes, but not 4:
unsigned char __readfsbyte(unsigned long);
unsigned __int64 __readfsqword(unsigned long);
unsigned short __readfsword(unsigned long);
See the try jobs in https://chromium-review.googlesource.com/c/v8/v8/+/3042215
for an example of the failures, on the v8_win_compile_dbg bot.
https://bugs.llvm.org/show_bug.cgi?id=38726 looks similar, but different.
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