Add GCC-compatible flags -fprofile-generate and -fprofile-use

[Diego Novillo]

On Tue, Jul 7, 2015 at 5:55 PM, Justin Bogner <mail at justinbogner.com> wrote:
> Diego Novillo <dnovillo at google.com> writes:
>> I've updated the frontend and runtime patches based on the discussions
>> we had in this thread and IRC.
>>
>> Thanks.  Diego.
>>
>>
>> commit b0ac1b3d8529318bed75c89b44d0b0a03c0d3497
>> Author: Diego Novillo <dnovillo at google.com>
>> Date:   Thu Jun 25 18:50:33 2015 -0400
>>
>>     Add support for generating profiles in a given directory.
>>
>>     When the file is initialized, this patch checks whether the path
>>     specifies a directory. If so, it creates the directory tree before
>>     truncating the file.
>>
>>     Use default.profdata instead of pgo-data for default indexed profile name.
>>
>> diff --git a/lib/profile/GCDAProfiling.c b/lib/profile/GCDAProfiling.c
>> index e32e97f..e245cf0 100644
>> --- a/lib/profile/GCDAProfiling.c
>> +++ b/lib/profile/GCDAProfiling.c
>> @@ -20,6 +20,8 @@
>>  |*
>>  \*===----------------------------------------------------------------------===*/
>>
>> +#include "InstrProfiling.h"
>> +
>>  #include <errno.h>
>>  #include <fcntl.h>
>>  #include <stdio.h>
>> @@ -209,7 +211,8 @@ static char *mangle_filename(const char *orig_filename) {
>>    return new_filename;
>>  }
>>
>> -static void recursive_mkdir(char *path) {
>> +__attribute__((visibility("hidden")))
>> +void __llvm_profile_recursive_mkdir(char *path) {
>
> Better break this out of GCDAProfiling.c into a separate file - we don't
> want to force InstrProfiling to pull in GCDAProfiling symbols, and it's
> a layering violation for GCDAProfiling to be #including
> InstrProfiling.h.

I had initially moved it into InstrProfiling.c.  Would that be OK?
GCDAProfiling and InstrProfiling end up in the same library, not sure
how the layering is setup here.  They all seem to be in the same bag.


Diego.