CMake: unusable tool_hugehelp.c with MinGW

[MarcelRaad]

I did this

cmake -G "MSYS Makefiles" [...] && cmake --build .

I got a compile error because my tool_hugehelp.c contains:

C:/MinGW/msys/1.0/* built-in manual is disabled, blank function */

I expected the following

Successful compilation and no POSIX path conversion, like with the autotools build.

CMake version:

curl/src/CMakeLists.txt

Line 30 in 6932849

COMMAND ${CMAKE_COMMAND} -E echo "/* built-in manual is disabled, blank function */" > tool_hugehelp.c

Automake version:

curl/src/Makefile.am

Line 128 in b801b45

echo "/* built-in manual is disabled, blank function */" > $(HUGE)

curl/libcurl version

git master 12dde22

operating system

Windows 10

[bagder]

It seems to require perl and nroff:

https://github.com/curl/curl/blob/master/CMakeLists.txt#L211-L213

I don't think hugehelp generation actually needs nroff though...

[MarcelRaad]

Ah, you're right! When using the autotools build, I do have a full tool_hugehelp.c without this comment, still without nroff.

[bagder]

No, I was wrong! src/Makefile.am uses nroff to build the huge help output. It runs the equivalent of:

 nroff -man curl.1 | perl mkhelp.pl docs/MANUAL >> huge.c

... after curl.1 has been generated of course.

[MarcelRaad]

Right, I do have groff (and its nroff script) in $PATH, only the CMake build won't use it...

[KangLin]

Reference: https://github.com/KangLin/RabbitThirdLibrary
Build script:
https://github.com/KangLin/RabbitThirdLibrary/blob/master/build_script/build_libcurl.sh