[Msys2-users] strange results from configure running g++

[Stephen L. <ste...@st...>]

I'm getting configure failures that appear to be caused by g++ not
returning status to the msys64 shell correctly.

For example:

checking whether plain char is signed... no

config.log shows:

configure:7042: checking whether plain char is signed
configure:7060: g++ -c -I/Msys2/msys64/include -I/Msys2/msys64/mingw64/include -g -O2 -Wall  conftest.cpp >&5
conftest.cpp: In function 'int main()':
conftest.cpp:20:12: warning: variable 'test_array' set but not used [-Wunused-but-set-variable]
 static int test_array [1 - 2 * !(((int)(char)-1) < 0)];
            ^
configure:7060: $? = 0
configure: failed program was:

But g++ did not fail; it only reported a warning.

Running the same g++ command directly in the msys64 shell, followed by
'echo $?', gives 0. But adding 'echo $?' to the configure script gives
1. So something is different when run by the configure script.

Several similar tests are failing similarly, but others are passing.
 
-- 
-- Stephe