[MacPorts] #55415: cmake @3.10.0 does not build on PPC Tiger, Mac OS X 10.4.11, because error: void value not ignored as it ought to be

[MacPorts]

#55415: cmake @3.10.0 does not build on PPC Tiger, Mac OS X 10.4.11, because error:
void value not ignored as it ought to be
------------------------+-----------------------
  Reporter:  ballapete  |      Owner:  michaelld
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.2
Resolution:             |   Keywords:  tiger
      Port:  cmake      |
------------------------+-----------------------

Comment (by ballapete):

 Replying to [comment:2 kencu]:
 > try adding this and please report back
 >
 The error is left:

 {{{
 /opt/local/bin/gcc-mp-6 -pipe -Os -m32
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Bootstrap.cmk
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Source
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Source/LexerParser
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Utilities
 -DCMAKE_BOOTSTRAP -D_DARWIN_USE_64_BIT_INODE=1
 -D_DARWIN_UNLIMITED_SELECT=1
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Utilities/cmlibuv/include
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Utilities/cmlibuv/src/unix
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Utilities/cmlibuv/src
 -c
 /opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Utilities/cmlibuv/src/unix/core.c
 -o uv-src-unix-core.c.o
 /opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Utilities/cmlibuv/src/unix/core.c:
 In function 'uv_os_unsetenv':
 /opt/local/var/macports/build/_opt_local_var_macports_sources_lil.fr.rsync.macports.org_release_tarballs_ports_devel_cmake/cmake/work/cmake-3.10.0/Utilities/cmlibuv/src/unix/core.c:1292:7:
 error: void value not ignored as it ought to be
    if (unsetenv(name) != 0)
        ^~~~~~~~~~~~~~
 gmake: *** [Makefile:384: uv-src-unix-core.c.o] Error 1
 ---------------------------------------------
 }}}

 The `pre-processor` produces this code:

 {{{
 int uv_os_unsetenv(const char* name) {
   if (unsetenv(name) != 0)
     return -
 # 1293 "Utilities/cmlibuv/src/unix/core.c" 3 4
            (*__error())
 # 1293 "Utilities/cmlibuv/src/unix/core.c"
                 ;

   return 0;
 }
 }}}

 `uv_os_unsetenv()` is declared in

 {{{
 Utilities/cmlibuv/include/uv.h:UV_EXTERN int uv_os_setenv(const char*
 name, const char* value);
 Utilities/cmlibuv/include/uv.h:UV_EXTERN int uv_os_unsetenv(const char*
 name);
 }}}

 They both overwrite the system's declarations.

--
Ticket URL: <https://trac.macports.org/ticket/55415#comment:6>
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