The SOURCES variable was added to gdb/Makefile.in as part of commit:
commit
fb40c20903110ed8af9701ce7c2635abd3770d52
Date: Wed Feb 23 00:25:43 2000 +0000
Add mi/ and testsuite/gdb.mi/ subdirectories.
But as far as I can tell was not used at the time it was added, and is
not used today.
Lets remove it.
DEPFILES = $(TARGET_OBS) $(SER_HARDWIRE) $(NATDEPFILES) $(SIM_OBS)
-SOURCES = $(SFILES) $(ALLDEPFILES) $(YYFILES) $(CONFIG_SRCS)
# Don't include YYFILES (*.c) because we already include *.y in SFILES,
# and it's more useful to see it in the .y file.
TAGFILES_NO_SRCDIR = $(SFILES) $(HFILES_NO_SRCDIR) $(ALLDEPFILES) \