Reviewed-by: Bruce Cherniak <bruce.chern...@intel.com>

> On Jun 26, 2017, at 9:34 AM, Eric Engestrom <eric.engest...@imgtec.com> wrote:
> 
> On Monday, 2017-06-26 09:03:13 -0500, Tim Rowley wrote:
>> Some combinations of c++ compilers and standard libraries had problems
>> with the string::replace code we were using previously.
>> 
>> This should fix the travis-ci system.
> 
> Yup, confirmed: https://travis-ci.org/1ace/mesa/builds/247116248
> 
> Tested-by: Eric Engestrom <eric.engest...@imgtec.com>
> 
> Thanks!
> 
>> ---
>> .../drivers/swr/rasterizer/codegen/templates/gen_knobs.cpp   | 12 
>> +++++++++---
>> 1 file changed, 9 insertions(+), 3 deletions(-)
>> 
>> diff --git 
>> a/src/gallium/drivers/swr/rasterizer/codegen/templates/gen_knobs.cpp 
>> b/src/gallium/drivers/swr/rasterizer/codegen/templates/gen_knobs.cpp
>> index 0527bf3..e109fd2 100644
>> --- a/src/gallium/drivers/swr/rasterizer/codegen/templates/gen_knobs.cpp
>> +++ b/src/gallium/drivers/swr/rasterizer/codegen/templates/gen_knobs.cpp
>> @@ -141,21 +141,27 @@ extern GlobalKnobs g_GlobalKnobs;
>> void KnobBase::autoExpandEnvironmentVariables(std::string &text)
>> {
>>     {
>> +        // unix style variable replacement
>>         static std::regex env("\\$\\{([^}]+)\\}");
>>         std::smatch match;
>>         while (std::regex_search(text, match, env))
>>         {
>>             const std::string var = GetEnv(match[1].str());
>> -            text.replace(match[0].first, match[0].second, var);
>> +            // certain combinations of gcc/libstd++ have problems with this
>> +            // text.replace(match[0].first, match[0].second, var);
>> +            text.replace(match.prefix().length(), match[0].length(), var);
>>         }
>>     }
>>     {
>> +        // win32 style variable replacement
>>         static std::regex env("\\%([^}]+)\\%");
>>         std::smatch match;
>>         while (std::regex_search(text, match, env))
>>         {
>>             const std::string var = GetEnv(match[1].str());
>> -            text.replace(match[0].first, match[0].second, var);
>> +            // certain combinations of gcc/libstd++ have problems with this
>> +            // text.replace(match[0].first, match[0].second, var);
>> +            text.replace(match.prefix().length(), match[0].length(), var);
>>         }
>>     }
>> }
>> @@ -232,4 +238,4 @@ std::string GlobalKnobs::ToString(const char* 
>> optPerLinePrefix)
>>         return ' '*(max_len - name_len)
>> 
>> 
>> -%>
>> \ No newline at end of file
>> +%>
>> -- 
>> 2.7.4
>> 
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