[PATCH 5.11 079/306] perf build: Fix ccache usage in $(CC) when generating arch errno table

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

From: Antonio Terceiro <redacted>

commit dacfc08dcafa7d443ab339592999e37bbb8a3ef0 upstream.

This was introduced by commit e4ffd066ff440a57 ("perf: Normalize gcc
parameter when generating arch errno table").

Assuming the first word of $(CC) is the actual compiler breaks usage
like CC="ccache gcc": the script ends up calling ccache directly with
gcc arguments, what fails. Instead of getting the first word, just
remove from $(CC) any word that starts with a "-". This maintains the
spirit of the original patch, while not breaking ccache users.

Fixes: e4ffd066ff440a57 ("perf: Normalize gcc parameter when generating arch errno table")
Signed-off-by: Antonio Terceiro <redacted>
Tested-by: Arnaldo Carvalho de Melo <redacted>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: He Zhe <redacted>
Cc: Jiri Olsa <redacted>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: http://lore.kernel.org/lkml/20210224130046.346977-1-antonio.terceiro@linaro.org (local)
Signed-off-by: Arnaldo Carvalho de Melo <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 tools/perf/Makefile.perf |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf

@@ -600,7 +600,7 @@ arch_errno_hdr_dir := $(srctree)/tools
 arch_errno_tbl := $(srctree)/tools/perf/trace/beauty/arch_errno_names.sh
 
 $(arch_errno_name_array): $(arch_errno_tbl)
-	$(Q)$(SHELL) '$(arch_errno_tbl)' $(firstword $(CC)) $(arch_errno_hdr_dir) > $@
+	$(Q)$(SHELL) '$(arch_errno_tbl)' '$(patsubst -%,,$(CC))' $(arch_errno_hdr_dir) > $@
 
 sync_file_range_arrays := $(beauty_outdir)/sync_file_range_arrays.c
 sync_file_range_tbls := $(srctree)/tools/perf/trace/beauty/sync_file_range.sh