http://llvm.org/bugs/show_bug.cgi?id=21319
Bug ID: 21319
Summary: clang 3.4 and above integrated assembler does not
respect the .arch directive in .s files for arm
Product: clang
Version: 3.4
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13226
--> http://llvm.org/bugs/attachment.cgi?id=13226&action=edit
gcc_arm.s extracted from golang.org/src/runtime/cgo/gcc_arm.S
The integrated assembler does not appear to honour the .arch directive in .s
files.
For the sample code attached, on a platform where clang has been compiled for
the default arch of armv4t (debian sid in this case). The .s file specifies
.arch armv5t but this does not appear to be honoured.
$ clang -c gcc_arm.s
gcc_arm.s:25:2: error: instruction requires: armv5t
blx r5 // setg(g)
^
gcc_arm.s:26:2: error: instruction requires: armv5t
blx r4 // fn()
^
Interesting the contents of .arch are being validated.
$ clang -c gcc_arm.s
gcc_arm.s:10:1: error: Unknown arch name
.arch armv42
^ setting .arch to something silly
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