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Re: [PATCH] Add linker_output as prefix for LTO temps (PR lto/86548).
On 07/26/2018 02:26 PM, Richard Biener wrote:
> On Thu, Jul 26, 2018 at 2:12 PM Martin Liška <mliska@suse.cz> wrote:
>>
>> On 07/26/2018 01:34 PM, Richard Biener wrote:
>>> On Thu, Jul 26, 2018 at 12:55 PM Martin Liška <mliska@suse.cz> wrote:
>>>>
>>>> Hi.
>>>>
>>>> As requested in the PR, now we produce prefixes for temp files in LTO:
>>>>
>>>> Example:
>>>> $ gcc -flto main.o a.o --save-temps -o mybinary
>>>>
>>>> generates:
>>>> $ ls /tmp/mybinary*
>>>> /tmp/mybinary /tmp/mybinary.ltrans0.o /tmp/mybinary.ltrans0.s /tmp/mybinary.ltrans.out
>>>
>>> It will be /tmp/mybinary.abc421.ltrans0.o
>>> /tmp/mybinary.abc421.ltrans1.o, etc., correct?
>>
>> Yes, --save-temps changes which file names are used. Before patch:
>>
>> $ strace -f -s512 gcc -flto a.o main.o -o mybinary 2>&1 | grep execv | grep ltrans
>> [pid 23926] execve("/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", ["/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", "-quiet", "-dumpdir", "./", "-dumpbase", "mybinary.wpa", "-mtune=generic", "-march=x86-64", "-mtune=generic", "-march=x86-64", "-auxbase", "a", "-fno-openmp", "-fno-openacc", "-fltrans-output-list=/tmp/ccPVzNR6.ltrans.out", "-fwpa", "-fresolution=/tmp/ccuocrhY.res", "-flinker-output=exec", "@/tmp/ccHQA575"], 0x7fffffffd960 /* 105 vars */ <unfinished ...>
>> [pid 23928] execve("/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", ["/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", "-quiet", "-dumpdir", "./", "-dumpbase", "mybinary.ltrans0", "-mtune=generic", "-march=x86-64", "-mtune=generic", "-march=x86-64", "-auxbase-strip", "/tmp/ccPVzNR6.ltrans0.ltrans.o", "-fno-openmp", "-fno-openacc", "-fltrans", "@/tmp/ccssDdS8", "-o", "/tmp/cclsKY4G.s"], 0x7fffffffd960 /* 105 vars */ <unfinished ...>
>> [pid 23929] execve("/home/marxin/bin/gcc/bin//as", ["as", "--64", "-o", "/tmp/ccPVzNR6.ltrans0.ltrans.o", "/tmp/cclsKY4G.s"], 0x7fffffffd960 /* 105 vars */) = -1 ENOENT (No such file or directory)
>> [pid 23929] execve("/home/marxin/bin/as", ["as", "--64", "-o", "/tmp/ccPVzNR6.ltrans0.ltrans.o", "/tmp/cclsKY4G.s"], 0x7fffffffd960 /* 105 vars */) = -1 ENOENT (No such file or directory)
>> [pid 23929] execve("/usr/local/bin/as", ["as", "--64", "-o", "/tmp/ccPVzNR6.ltrans0.ltrans.o", "/tmp/cclsKY4G.s"], 0x7fffffffd960 /* 105 vars */) = -1 ENOENT (No such file or directory)
>> [pid 23929] execve("/usr/bin/as", ["as", "--64", "-o", "/tmp/ccPVzNR6.ltrans0.ltrans.o", "/tmp/cclsKY4G.s"], 0x7fffffffd960 /* 105 vars */ <unfinished ...>
>>
>> after:
>>
>> $ strace -f -s512 gcc -flto a.o main.o -o mybinary 2>&1 | grep execv | grep ltrans
>> [pid 16379] execve("/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", ["/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", "-quiet", "-dumpdir", "./", "-dumpbase", "mybinary.wpa", "-mtune=generic", "-march=x86-64", "-mtune=generic", "-march=x86-64", "-auxbase", "a", "-fno-openmp", "-fno-openacc", "-fltrans-output-list=/tmp/mybinary.VkVmXd.ltrans.out", "-fwpa", "-fresolution=/tmp/ccnQ6e55.res", "-flinker-output=exec", "@/tmp/cc0Sv5Fe"], 0x7fffffffd960 /* 105 vars */ <unfinished ...>
>> [pid 16381] execve("/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", ["/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", "-quiet", "-dumpdir", "./", "-dumpbase", "mybinary.ltrans0", "-mtune=generic", "-march=x86-64", "-mtune=generic", "-march=x86-64", "-auxbase-strip", "/tmp/mybinary.VkVmXd.ltrans0.ltrans.o", "-fno-openmp", "-fno-openacc", "-fltrans", "@/tmp/ccDY6Ojf", "-o", "/tmp/ccrmLPAG.s"], 0x7fffffffd960 /* 105 vars */ <unfinished ...>
>> [pid 16382] execve("/home/marxin/bin/gcc/bin//as", ["as", "--64", "-o", "/tmp/mybinary.VkVmXd.ltrans0.ltrans.o", "/tmp/ccrmLPAG.s"], 0x7fffffffd960 /* 105 vars */) = -1 ENOENT (No such file or directory)
>> [pid 16382] execve("/home/marxin/bin/as", ["as", "--64", "-o", "/tmp/mybinary.VkVmXd.ltrans0.ltrans.o", "/tmp/ccrmLPAG.s"], 0x7fffffffd960 /* 105 vars */) = -1 ENOENT (No such file or directory)
>> [pid 16382] execve("/usr/local/bin/as", ["as", "--64", "-o", "/tmp/mybinary.VkVmXd.ltrans0.ltrans.o", "/tmp/ccrmLPAG.s"], 0x7fffffffd960 /* 105 vars */) = -1 ENOENT (No such file or directory)
>> [pid 16382] execve("/usr/bin/as", ["as", "--64", "-o", "/tmp/mybinary.VkVmXd.ltrans0.ltrans.o", "/tmp/ccrmLPAG.s"], 0x7fffffffd960 /* 105 vars */ <unfinished ...>
>>
>>
>>>
>>> Otherwise there's the chance to trash user files which isn't good.
>>
>> Sure, the patch behaves fine. I'll install it.
>
> Btw, it would be more natural if with -save-temps those files were in
> the same directory as the output (see how we handle
> -fresolution= for example) and be named without abcd1234 stuff. That
> also avoids $tmp creep if you use -save-temps
> multiple times...
If I see correctly they are:
$ strace -f -s512 gcc -flto a.o main.o -o mybinary --save-temps 2>&1 | grep execv | grep ltrans
[pid 11343] execve("/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", ["/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", "-quiet", "-dumpdir", "./", "-dumpbase", "mybinary.wpa", "-mtune=generic", "-march=x86-64", "-mtune=generic", "-march=x86-64", "-auxbase", "a", "-fno-openmp", "-fno-openacc", "-fltrans-output-list=mybinary.ltrans.out", "-fwpa", "-fresolution=main.res", "-flinker-output=exec", "@/tmp/ccofC8gO"], 0x7fffffffd940 /* 105 vars */ <unfinished ...>
[pid 11345] execve("/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", ["/home/marxin/bin/gcc/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto1", "-quiet", "-dumpdir", "./", "-dumpbase", "mybinary.ltrans0", "-mtune=generic", "-march=x86-64", "-mtune=generic", "-march=x86-64", "-auxbase-strip", "mybinary.ltrans0.ltrans.o", "-fno-openmp", "-fno-openacc", "-fltrans", "@/tmp/cc8GLrIR", "-o", "mybinary.ltrans0.s"], 0x7fffffffd940 /* 105 vars */ <unfinished ...>
[pid 11346] execve("/home/marxin/bin/gcc/bin//as", ["as", "--64", "-o", "mybinary.ltrans0.ltrans.o", "mybinary.ltrans0.s"], 0x7fffffffd940 /* 105 vars */) = -1 ENOENT (No such file or directory)
[pid 11346] execve("/home/marxin/bin/as", ["as", "--64", "-o", "mybinary.ltrans0.ltrans.o", "mybinary.ltrans0.s"], 0x7fffffffd940 /* 105 vars */) = -1 ENOENT (No such file or directory)
[pid 11346] execve("/usr/local/bin/as", ["as", "--64", "-o", "mybinary.ltrans0.ltrans.o", "mybinary.ltrans0.s"], 0x7fffffffd940 /* 105 vars */) = -1 ENOENT (No such file or directory)
[pid 11346] execve("/usr/bin/as", ["as", "--64", "-o", "mybinary.ltrans0.ltrans.o", "mybinary.ltrans0.s"], 0x7fffffffd940 /* 105 vars */ <unfinished ...>
Martin
>
> Richard.
>
>> Martin
>>
>>>
>>>> Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.
>>>>
>>>> Ready to be installed?
>>>
>>> OK if the above is correct.
>>>
>>> Thanks,
>>> Richard.
>>>
>>>> Martin
>>>>
>>>> gcc/ChangeLog:
>>>>
>>>> 2018-07-26 Martin Liska <mliska@suse.cz>
>>>>
>>>> PR lto/86548
>>>> * lto-wrapper.c: Add linker_output as prefix
>>>> for ltrans_output_file.
>>>>
>>>> include/ChangeLog:
>>>>
>>>> 2018-07-26 Martin Liska <mliska@suse.cz>
>>>>
>>>> PR lto/86548
>>>> * libiberty.h (make_temp_file_with_prefix): New function.
>>>>
>>>> libiberty/ChangeLog:
>>>>
>>>> 2018-07-26 Martin Liska <mliska@suse.cz>
>>>>
>>>> PR lto/86548
>>>> * make-temp-file.c (TEMP_FILE): Remove leading 'cc'.
>>>> (make_temp_file): Call make_temp_file_with_prefix with
>>>> first argument set to NULL.
>>>> (make_temp_file_with_prefix): Support also prefix.
>>>> ---
>>>> gcc/lto-wrapper.c | 14 +++++++++++++-
>>>> include/libiberty.h | 5 +++++
>>>> libiberty/make-temp-file.c | 24 ++++++++++++++++++------
>>>> 3 files changed, 36 insertions(+), 7 deletions(-)
>>>>
>>>>
>>