Eli reported a failure in the detection code of iconv on MinGW while
building groff:
configure:9176: checking for working iconv
configure:9296: g++ -o conftest.exe -O0 -g3 -Id:/usr/include conftest.cpp
d:/usr/lib/libiconv.dll.a -Ld:/usr/lib >&5
conftest.cpp: In function 'int main()':
conftest.cpp:62:51: error: invalid conversion from 'char**' to 'const char**'
[-fpermissive]
In file included from conftest.cpp:43:0:
d:\usr\bin\../lib/gcc/mingw32/4.7.2/../../../../include/iconv.h:83:15: error:
initializing argument 2 of 'size_t libiconv(libiconv_t, const char**, size_t*,
char**, size_t*)' [-fpermissive]
conftest.cpp:82:51: error: invalid conversion from 'char**' to 'const char**'
[-fpermissive]
In file included from conftest.cpp:43:0:
d:\usr\bin\../lib/gcc/mingw32/4.7.2/../../../../include/iconv.h:83:15: error:
initializing argument 2 of 'size_t libiconv(libiconv_t, const char**, size_t*,
char**, size_t*)' [-fpermissive]
conftest.cpp:101:51: error: invalid conversion from 'char**' to 'const
char**' [-fpermissive]
In file included from conftest.cpp:43:0:
d:\usr\bin\../lib/gcc/mingw32/4.7.2/../../../../include/iconv.h:83:15: error:
initializing argument 2 of 'size_t libiconv(libiconv_t, const char**, size_t*,
char**, size_t*)' [-fpermissive]
configure:9296: $? = 1
configure: program exited with status 1
He writes:
My libiconv is fairly old, and I'm reluctant to upgrade, because my
MSYS/MinGW build environment is extremely stable and rock-solid, so
I don't want to change it without a very good reason
I solved this by using -fpermissive in GCC flags:
CFLAGS='-O0 -g3' CXXFLAGS='-O0 -g3 -fpermissive' ./configure
--prefix=d:/usr
However, I wonder whether the configure script could also try a
similar test program, but with 'const' dropped, if the one with
'const' failed. If not, I will use my work-around.
It seems to me that the problem is a bug in gnulib's `iconv.m4'
serial 18 file: Looking into this file I see that the body of
`AM_ICONV' calls the macro `AM_ICONV_LINK' before the test that checks
whether `const' is needed. Obviously, it should be vice versa.
Werner
