Compiling plget on MSYS2 results in missing header <libxml/tree.h>

[mast3rz3ro]

Hi,

I have libxml2-devel Installed but problem still presents.

$ ./configure.sh
libxml2: built-in
Done. Now run: make

$ make
gcc plget.c -o plget -lxml2
plget.c:3:10: fatal error: libxml/tree.h: No such file or directory
    3 | #include <libxml/tree.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:8: plget] Error 1

[mast3rz3ro]

According to this answer I was able to pass this error by replacing LDFLAGS=-lxml2 with LDFLAGS=-I/usr/include/libxml2

But now I'm getting this error:

$ make
gcc plget.c -o plget -I/usr/include/libxml2
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x7b): undefined reference to `__imp_xmlParseFile'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0xdc): undefined reference to `__imp_xmlDocGetRootElement'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x128): undefined reference to `__imp_xmlFreeDoc'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x188): undefined reference to `__imp_xmlFreeDoc'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x1c3): undefined reference to `__imp_xmlStrcmp'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x1f6): undefined reference to `__imp_xmlStrcmp'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x34b): undefined reference to `__imp_xmlStrcmp'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x3be): undefined reference to `__imp_xmlStrcmp'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x3f3): undefined reference to `__imp_xmlStrcmp'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x434): undefined reference to `__imp_xmlFreeDoc'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x463): undefined reference to `__imp_xmlFree'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x49f): undefined reference to `__imp_xmlFree'
/usr/lib/gcc/x86_64-pc-msys/11.3.0/../../../../x86_64-pc-msys/bin/ld: /tmp/ccyVR9XL.o:plget.c:(.text+0x4d0): undefined reference to `__imp_xmlNodeListGetString'
collect2: error: ld returned 1 exit status
make: *** [Makefile:8: plget] Error 1

Trying to compile with g++ instead of gcc results in:

$ make
g++ plget.c -o plget -I/usr/include/libxml2
plget.c: In function ‘path_t* createComps(const char*)’:
plget.c:168:41: error: invalid conversion from ‘void*’ to ‘Path’ {aka ‘path_t*’} [-fpermissive]
  168 |                     path = tail = malloc(sizeof(struct path_t));
      |                                   ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
      |                                         |
      |                                         void*
plget.c:170:40: error: invalid conversion from ‘void*’ to ‘Path’ {aka ‘path_t*’} [-fpermissive]
  170 |                     tail->next = malloc(sizeof(struct path_t));
      |                                  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
      |                                        |
      |                                        void*
make: *** [Makefile:8: plget] Error 1

[kallewoof]

I don't have MSYS2 available right now, but your compiler error indicates that you are not actually linking to the libxml2 libraries. -I just does the include part, you also have to link it.

[mast3rz3ro]

I have finally manage to compile it, thanks for your hints.

configure.sh:19

echo -n -e "LDFLAGS=-lxml2\nCPPFLAGS=\n" > Makefile
into
echo -n -e "LDFLAGS=-lxml2 -I/usr/include/libxml2\nCPPFLAGS=\n" > Makefile

Thank you for this lightweight awesome tool !
Please feel free to close this issue ;).

[kallewoof]

Great! It would be nice if you made a pull request to update README.md with MSYS2 specific instructions, now that you have it figured out.