[build2] Problems with hash in multiline string
Jörn Teuber
me at jaytea.org
Mon Nov 1 12:09:28 UTC 2021
Hello everyone,
I'm currently experimenting with build2 and came across a weird problem
that can be reproduced with this Test.cpp:
#include<iostream>
intmain()
{
std::cout<<R"(
# test
)";
}
When executing 'b' on it I get
error: inconsistent C++ compiler behavior
info: run the following two commands to investigate
info: g++ -I/home/jay/Projects/Test-gcc/Test
-I/home/jay/Projects/Test -std=c++2a -x c++ -MQ ^ -MD -E
-fdirectives-only -MF /home/jay/Projects/Test-gcc/Test/Test/Test.o.t -o
/home/jay/Projects/Test-gcc/Test/Test/Test.o.ii
/home/jay/Projects/Test/Test/Test.cpp
info: g++ -I/home/jay/Projects/Test-gcc/Test
-I/home/jay/Projects/Test -std=c++2a -x c++ -MQ ^ -M -MG
/home/jay/Projects/Test/Test/Test.cpp
info: while extracting header dependencies from
Test/cxx{Test}@../Test-gcc/Test/Test/
info: while applying rule cxx.compile to update
../Test-gcc/Test/Test/obje{Test}
info: while applying rule cxx.link to update
../Test-gcc/Test/Test/exe{Test}
info: while applying rule alias to update ../Test-gcc/Test/dir{Test/}
info: while applying rule alias to update ../Test-gcc/dir{Test/}
info: failed to update ../Test-gcc/dir{Test/}
Executing the first g++ line I get:
/home/jay/Projects/Test/Test/Test.cpp:9:3: error: invalid preprocessing
directive #test
9 | # test
| ^~~~
The second line runs perfectly fine.
I feel like that might even be a bug in gcc, but as I don't understand
what is going on in that first g++ invocation I thought I first try this
channel.
Best regards,
Jorn
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