cmake: do not pass linker flags to the static library tool

Do not add linker flags to the global CMake static library tool (aka
"static linker") (e.g. `ar`) flags list. They don't mix well. This was
only done after successfully detecting GSSAPI.

Linker flags seen on Old Linux CI:
```
-- |GSS_LINKER_FLAGS|-Wl,--enable-new-dtags -Wl,-rpath -Wl,/usr/lib/x86_64-linux-gnu/heimdal|
-- |CMAKE_STATIC_LINKER_FLAGS| -Wl,--enable-new-dtags -Wl,-rpath -Wl,/usr/lib/x86_64-linux-gnu/heimdal|
```
Ref: https://github.com/curl/curl/actions/runs/9138988036/job/25130791712#step:6:85

Causing:
```
/usr/bin/ar qc libcurltool.a  -Wl,--enable-new-dtags -Wl,-rpath -Wl,/usr/lib/x86_64-linux-gnu/heimdal
  CMakeFiles/curltool.dir/slist_wc.c.o CMakeFiles/curltool.dir/tool_binmode.c.o CMakeFiles/curltool.dir/tool_bname.c.o
  [...]
  CMakeFiles/curltool.dir/tool_writeout_json.c.o CMakeFiles/curltool.dir/tool_xattr.c.o CMakeFiles/curltool.dir/var.c.o
  CMakeFiles/curltool.dir/__/lib/base64.c.o CMakeFiles/curltool.dir/__/lib/dynbuf.c.o
/usr/bin/ar: invalid option -- 'W'
Usage: /usr/bin/ar [emulation options] [-]{dmpqrstx}[abcDfilMNoPsSTuvV] [--plugin <name>] [member-name] [count] archive-file file...
       /usr/bin/ar -M [<mri-script]
```
Ref: https://github.com/curl/curl/actions/runs/9138988036/job/25130791712#step:9:125

This problem is invisible at the moment because of another bug (#13698)
that misses building unit tests when not using either the
`ENABLE_DEBUG=ON` or `ENABLE_CURLDEBUG=ON` options (to set
`-DCURLDEBUG`):
```
test 1300 SKIPPED: curl lacks unittest support
```
Ref: https://github.com/curl/curl/actions/runs/9135571781/job/25123104557#step:9:2883

With that fixed, this becomes the next issue.

It's possible this bug also required an older CMake version and/or
a specific OS environment which uses linker flags in GSSAPI that are not
playing well with `ar` options, to reproduce.

Follow-up to 558814e16d84aa202c5ccc0c8108a9d728e77a58 (2014-09-25)
Ref: #13698
Closes #13697

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f2792066088b1eca7f17efa4c9b7bf50e94bedaa..c3525d3fcab06ecec6f4e60cbd40a6d6ec2880a7 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1010,7 +1010,6 @@ if(CURL_USE_GSSAPI)
     string(REPLACE ";" " " GSS_LINKER_FLAGS "${GSS_LINKER_FLAGS}")
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${GSS_LINKER_FLAGS}")
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${GSS_LINKER_FLAGS}")
-    set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} ${GSS_LINKER_FLAGS}")
     list(APPEND CURL_LIBS ${GSS_LIBRARIES})
 
   else()