[XS] Change in coreboot[main]: Makefile: Add build/3rdparty as an exception for project_filelist.txt

[Matt DeVillier (Code Review)]

Matt DeVillier has submitted this change. ( https://review.coreboot.org/c/coreboot/+/86868?usp=email )

Change subject: Makefile: Add build/3rdparty as an exception for project_filelist.txt
......................................................................

Makefile: Add build/3rdparty as an exception for project_filelist.txt

The ctags tool (called by ctags-project target) currently complains
about not finding certain files:
```
ctags: Warning: cannot open input file "bl31/aarch64/bl31_entrypoint.S" : No such file or directory
ctags: Warning: cannot open input file "bl31/aarch64/crash_reporting.S" : No such file or directory
ctags: Warning: cannot open input file "bl31/aarch64/runtime_exceptions.S" : No such file or directory
ctags: Warning: cannot open input file "bl31/bl31.ld.S" : No such file or directory
ctags: Warning: cannot open input file "bl31/bl31_context_mgmt.c" : No such file or directory
ctags: Warning: cannot open input file "bl31/bl31_main.c" : No such file or directory
ctags: Warning: cannot open input file "bl31/bl31_traps.c" : No such file or directory
ctags: Warning: cannot open input file "bl31/interrupt_mgmt.c" : No such file or directory
ctags: Warning: cannot open input file "common/aarch64/debug.S" : No such file or directory
ctags: Warning: cannot open input file "common/bl_common.c" : No such file or directory
ctags: Warning: cannot open input file "common/fdt_fixup.c" : No such file or directory
...
```

The project_filelist.txt generation includes the compiler
generated "*.d" files, except for files found in build/util. Most file
paths in these "*.d" files are file paths relative to the root
directory of coreboot. Some projects though are compiled separately from
coreboot (e.g. payload, vboot, util). Some of these (e.g. util, vboot)
are also put into the build directory of coreboot and relative file
paths are relative to these projects instead of coreboot. This has the
uncanning side effect that the ctags Makefile target can't find these
files, since they are not relative to the coreboot root directory.

This patch excludes the build/3rdparty directory from those files, since
they contain 'separately' compiled projects like
3rdparty/arm-trusted-firmware.

Signed-off-by: Maximilian Brune 
Change-Id: I18d0377e327530d9ef9382c324a305d156c5c681
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86868
Reviewed-by: Paul Menzel 
Tested-by: build bot (Jenkins) 
Reviewed-by: Felix Held 
---
M Makefile
1 file changed, 1 insertion(+), 1 deletion(-)

Approvals:
  Paul Menzel: Looks good to me, but someone else must approve
  build bot (Jenkins): Verified
  Felix Held: Looks good to me, approved

diff --git a/Makefile b/Makefile
index 49c19cb..24b7c96 100644
--- a/Makefile
+++ b/Makefile
@@ -473,7 +473,7 @@
    	echo "*** Error: Project must be built before generating file list ***"; \
    	exit 1; \
    fi
-	find $(obj) -path "$(obj)/util" -prune -o -path "$(obj)/external" -prune -o -name "*.d" -exec cat {} ; | \
+	find $(obj) -path "$(obj)/util" -prune -o -path "$(obj)/external" -prune -o -path "$(obj)/3rdparty" -prune -o -name "*.d" -exec cat {} ; | \
      sed "s|$(top)/||" | sed 's/[:\]/ /g' | sed 's/ /\n/g' | sort | uniq | \
      grep -v '.o$$' > $(obj)/project_filelist.txt