On Sun, Feb 24, 2019 at 10:52:53AM -0800, Sam Weinig wrote:
> Hi Adrien,
> 
> Would you mind adding the compiler output when this happens? I’d like to see 
> exactly what the error you are seeing is.

Sorry, here is the compiler output:
http://paste.debian.net/1069971

In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp: In static 
member function 'static bool 
WebKit::NetworkResourceLoadParameters::decode(IPC::Decoder&, 
WebKit::NetworkResourceLoadParameters&)':
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:41: 
error: no matching function for call to 'IPC::Decoder::decode(WTF::ProcessID&)'
     if (!decoder.decode(result.parentPID))
                                         ^
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:80:10: note: candidate: bool 
IPC::Decoder::decode(bool&) <near match>
     bool decode(bool&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:80:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'bool&' to an rvalue of 
type 'bool'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:82:10: note: candidate: bool 
IPC::Decoder::decode(uint8_t&) <near match>
     bool decode(uint8_t&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:82:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'uint8_t& {aka unsigned 
char&}' to an rvalue of type 'uint8_t {aka unsigned char}'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:84:10: note: candidate: bool 
IPC::Decoder::decode(uint16_t&) <near match>
     bool decode(uint16_t&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:84:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'uint16_t& {aka short 
unsigned int&}' to an rvalue of type 'uint16_t {aka short unsigned int}'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:86:10: note: candidate: bool 
IPC::Decoder::decode(uint32_t&) <near match>
     bool decode(uint32_t&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:86:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'uint32_t& {aka unsigned 
int&}' to an rvalue of type 'uint32_t {aka unsigned int}'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:88:10: note: candidate: bool 
IPC::Decoder::decode(uint64_t&) <near match>
     bool decode(uint64_t&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:88:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'uint64_t& {aka long long 
unsigned int&}' to an rvalue of type 'uint64_t {aka long long unsigned int}'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:90:10: note: candidate: bool 
IPC::Decoder::decode(int16_t&) <near match>
     bool decode(int16_t&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:90:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'int16_t& {aka short 
int&}' to an rvalue of type 'int16_t {aka short int}'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:92:10: note: candidate: bool 
IPC::Decoder::decode(int32_t&) <near match>
     bool decode(int32_t&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:92:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'int32_t& {aka int&}' to 
an rvalue of type 'int32_t {aka int}'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:94:10: note: candidate: bool 
IPC::Decoder::decode(int64_t&) <near match>
     bool decode(int64_t&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:94:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'int64_t& {aka long long 
int&}' to an rvalue of type 'int64_t {aka long long int}'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:96:10: note: candidate: bool 
IPC::Decoder::decode(float&) <near match>
     bool decode(float&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:96:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'float&' to an rvalue of 
type 'float'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:98:10: note: candidate: bool 
IPC::Decoder::decode(double&) <near match>
     bool decode(double&);
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:98:10: note:   conversion of 
argument 1 would be ill-formed:
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:117:32: 
error: cannot bind non-const lvalue reference of type 'double&' to an rvalue of 
type 'double'
     if (!decoder.decode(result.parentPID))
                         ~~~~~~~^~~~~~~~~
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:30:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/Decoder.h:102:10: note: candidate: 
template<class E> std::enable_if_t<std::is_enum<_Tp>::value, bool> 
IPC::Decoder::decode(E&)
     auto decode(E& e) -> std::enable_if_t<std::is_enum<E>::value, bool>
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:102:10: note:   template argument 
deduction/substitution failed:
../../Source/WebKit/Platform/IPC/Decoder.h:148:10: note: candidate: 
template<class T, std::enable_if_t<((! std::is_enum<_Tp>::value) && 
IPC::UsesLegacyDecoder<U>::value)>* <anonymous> > bool IPC::Decoder::decode(T&)
     bool decode(T& t)
          ^~~~~~
../../Source/WebKit/Platform/IPC/Decoder.h:148:10: note:   template argument 
deduction/substitution failed:
../../Source/WebKit/Platform/IPC/Decoder.h:147:102: note: invalid template 
non-type parameter
     template<typename T, std::enable_if_t<!std::is_enum<T>::value && 
UsesLegacyDecoder<T>::value>* = nullptr>
                                                                                
                      ^~~~~~~
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:7:0:
../../Source/WebKit/NetworkProcess/NetworkSession.cpp: In static member 
function 'static WTF::Ref<WebKit::NetworkSession> 
WebKit::NetworkSession::create(WebKit::NetworkProcess&, 
WebKit::NetworkSessionCreationParameters&&)':
../../Source/WebKit/NetworkProcess/NetworkSession.cpp:59:1: warning: no return 
statement in function returning non-void [-Wreturn-type]
 }
 ^
In file included from 
../../Source/WebKit/NetworkProcess/Downloads/DownloadID.h:29:0,
                 from 
../../Source/WebKit/NetworkProcess/Downloads/Download.h:28,
                 from 
../../Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:29,
                 from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-2.cpp:1:
../../Source/WebKit/Platform/IPC/ArgumentCoder.h: In instantiation of 'static 
void IPC::ArgumentCoder< <template-parameter-1-1> >::encode(IPC::Encoder&, 
const T&) [with T = long int]':
../../Source/WebKit/Platform/IPC/Encoder.h:71:105:   required from 'void 
IPC::Encoder::encode(T&&) [with T = const long int&; std::enable_if_t<(! 
std::is_enum<typename std::remove_const<typename 
std::remove_reference<_From>::type>::type>::value)>* <anonymous> = 0]'
../../Source/WebKit/Platform/IPC/Encoder.h:84:9:   required from 'IPC::Encoder& 
IPC::Encoder::operator<<(T&&) [with T = const long int&; std::enable_if_t<(! 
std::is_enum<_Tp>::value)>* <anonymous> = 0]'
../../Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp:39:16:   
required from here
../../Source/WebKit/Platform/IPC/ArgumentCoder.h:90:11: error: request for 
member 'encode' in 't', which is of non-class type 'const long int'
         t.encode(encoder);
         ~~^~~~~~
[1034/1174] Building CXX object 
Source/WebKit/CMakeFiles/WebKit.dir/__/__/DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-1.cpp.o
In file included from 
DerivedSources/WebKit/unified-sources/UnifiedSource-72468c22-1.cpp:5:0:
../../Source/WebKit/NetworkProcess/NetworkDataTask.cpp: In static member 
function 'static WTF::Ref<WebKit::NetworkDataTask> 
WebKit::NetworkDataTask::create(WebKit::NetworkSession&, 
WebKit::NetworkDataTaskClient&, const WebKit::NetworkLoadParameters&)':
../../Source/WebKit/NetworkProcess/NetworkDataTask.cpp:62:1: warning: control 
reaches end of non-void function [-Wreturn-type]
 }
 ^
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