semihost: Clean up cmake build for arm

Make it possible to build the other targets by having the machine
bits control whether the general arm semihost files are built.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

semihost/CMakeLists.txt

@@ -43,45 +43,47 @@ target_include_directories(semihost SYSTEM PUBLIC ${PICOLIBC_INCLUDE_DIRECTORIES
 
 add_subdirectory(machine/${CMAKE_SYSTEM_PROCESSOR})
 
-target_sources(semihost PRIVATE
-  close.c
-  exit.c
-  fstat.c
-  gettimeofday.c
-  isatty.c
-  kill.c
-  lseek.c
-  lseek64.c
-  mapstdio.c
-  open.c
-  read.c
-  unlink.c
-  write.c
-  sys_clock.c
-  sys_close.c
-  sys_elapsed.c
-  sys_errno.c
-  sys_exit.c
-  sys_exit_extended.c
-  sys_feature.c
-  sys_flen.c
-  sys_get_cmdline.c
-  sys_getc.c
-  sys_heapinfo.c
-  sys_iserror.c
-  sys_istty.c
-  sys_open.c
-  sys_putc.c
-  sys_read.c
-  sys_remove.c
-  sys_rename.c
-  sys_seek.c
-  sys_system.c
-  sys_tickfreq.c
-  sys_time.c
-  sys_tmpnam.c
-  sys_write.c
-  sys_write0.c
-  iob.c
-  )
+if(DEFINED _SEMIHOST_ARM)
+  target_sources(semihost PRIVATE
+    close.c
+    exit.c
+    fstat.c
+    gettimeofday.c
+    isatty.c
+    kill.c
+    lseek.c
+    lseek64.c
+    mapstdio.c
+    open.c
+    read.c
+    unlink.c
+    write.c
+    sys_clock.c
+    sys_close.c
+    sys_elapsed.c
+    sys_errno.c
+    sys_exit.c
+    sys_exit_extended.c
+    sys_feature.c
+    sys_flen.c
+    sys_get_cmdline.c
+    sys_getc.c
+    sys_heapinfo.c
+    sys_iserror.c
+    sys_istty.c
+    sys_open.c
+    sys_putc.c
+    sys_read.c
+    sys_remove.c
+    sys_rename.c
+    sys_seek.c
+    sys_system.c
+    sys_tickfreq.c
+    sys_time.c
+    sys_tmpnam.c
+    sys_write.c
+    sys_write0.c
+    iob.c
+    )
+endif()
 

semihost/machine/arm/CMakeLists.txt

@@ -34,3 +34,5 @@
 #
 
 target_sources(semihost PRIVATE semihost-arm.S)
+
+set(_SEMIHOST_ARM 1 PARENT_SCOPE)