refactor: cppc to cxx at leftout places

Author: arteevraina

src/fpm_command_line.f90

@@ -203,7 +203,7 @@ subroutine get_command_line_settings(cmd_settings)
         character(len=*), parameter :: fc_env = "FC", cc_env = "CC", ar_env = "AR", &
             & fflags_env = "FFLAGS", cflags_env = "CFLAGS", ldflags_env = "LDFLAGS", &
             & fc_default = "gfortran", cc_default = " ", ar_default = " ", flags_default = " ", &
-            & cppc_env = "CPPC", cppc_default = " "
+            & cxx_env = "CXX", cxx_default = " "
         type(error_t), allocatable :: error
 
         call set_help()
@@ -247,7 +247,7 @@ subroutine get_command_line_settings(cmd_settings)
           ' --no-prune F' // &
           ' --compiler "'//get_fpm_env(fc_env, fc_default)//'"' // &
           ' --c-compiler "'//get_fpm_env(cc_env, cc_default)//'"' // &
-          ' --cpp-compiler "'//get_fpm_env(cppc_env, cppc_default)//'"' // &
+          ' --cpp-compiler "'//get_fpm_env(cxx_env, cxx_default)//'"' // &
           ' --archiver "'//get_fpm_env(ar_env, ar_default)//'"' // &
           ' --flag:: "'//get_fpm_env(fflags_env, flags_default)//'"' // &
           ' --c-flag:: "'//get_fpm_env(cflags_env, flags_default)//'"' // &

src/fpm_compiler.f90

@@ -793,15 +793,15 @@ end function enumerate_libraries
 
 
 !> Create new compiler instance
-subroutine new_compiler(self, fc, cc, cppc, echo, verbose)
+subroutine new_compiler(self, fc, cc, cxx, echo, verbose)
     !> New instance of the compiler
     type(compiler_t), intent(out) :: self
     !> Fortran compiler name or path
     character(len=*), intent(in) :: fc
     !> C compiler name or path
     character(len=*), intent(in) :: cc
     !> C++ Compiler name or path
-    character(len=*), intent(in) :: cppc
+    character(len=*), intent(in) :: cxx
     !> Echo compiler command
     logical, intent(in) :: echo
     !> Verbose mode: dump compiler output