http://llvm.org/bugs/show_bug.cgi?id=9374
Summary: clang makes a lot of system calls for output files
Product: clang
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Running clang -c testcase.c gets the following in a system call trace (which
I've manually filtered):
[pid 17523] stat("testcase.o", {st_mode=S_IFREG|0600, st_size=1120, ...}) = 0
[pid 17523] stat("testcase.o", {st_mode=S_IFREG|0600, st_size=1120, ...}) = 0
[pid 17523] access("testcase.o", W_OK) = 0
[pid 17523] stat("testcase.o", {st_mode=S_IFREG|0600, st_size=1120, ...}) = 0
[pid 17523] open("testcase.o-rM0aoW", O_RDWR|O_CREAT|O_EXCL, 0600) = 3
[pid 17523] close(3) = 0
[pid 17523] open("testcase.o-rM0aoW", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
[pid 17523] close(3) = 0
[pid 17523] open("testcase.o-rM0aoW", O_WRONLY|O_CREAT|O_TRUNC, 0664) = 3
[pid 17523] fstat(3, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
[pid 17523] close(3) = 0
[pid 17523] rename("testcase.o-rM0aoW", "testcase.o") = 0
This is pretty excessive. A fair amount of it appears to have come from
r114187, which was apparently intended for AST/PCH files, but was implemented
to apply to all output files.
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