Avoid race conditions when doing a parallelized buid.

If the -jX flag is used to indicate that X CPUs should be used to build
Frotz, there is a slight chance that the definitions files:
src/common/defs.h, src/curses/ux_defines.h, and src/common/git_hash.h;
will not be complete before the build process starts on the rest of the
source files.  If this happens, the build fails.

diff --git a/Makefile b/Makefile
index 1809fa287a72a49e0030d5fd9d143c9ab4f401c7..5da15b63133c9d76efb2fe5876c2a43e7a6a82a2 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ CFLAGS += -D_POSIX_C_SOURCE=200809L
 CFLAGS += -g
 
 # This keeps make(1) output understandable when using -j for parallel
-# building If your version of make(1) can't do parallel builds, comment
+# building. If your version of make(1) can't do parallel builds, comment
 # this out.
 MAKEFLAGS += -Orecurse
 
@@ -223,6 +223,7 @@ DOS_BIN = frotz.exe
 
 # Build recipes
 #
+
 curses: $(FROTZ_BIN)
 ncurses: $(FROTZ_BIN)
 $(FROTZ_BIN): $(COMMON_LIB) $(CURSES_LIB) $(BLORB_LIB) $(COMMON_LIB)
@@ -230,7 +231,7 @@ $(FROTZ_BIN): $(COMMON_LIB) $(CURSES_LIB) $(BLORB_LIB) $(COMMON_LIB)
        @echo "** Done building Frotz with curses interface"
        @echo "** Audio support $(CURSES_SOUND)"
 
-nosound: nosound_helper $(FROTZ_BIN)
+nosound: nosound_helper $(FROTZ_BIN) | nosound_helper
 nosound_helper:
        $(eval NOSOUND= -DNO_SOUND)
        $(eval CURSES_SOUND_LDFLAGS= )
@@ -262,11 +263,19 @@ dumb_lib: $(DUMB_LIB)
 blorb_lib:     $(BLORB_LIB)
 dos_lib:       $(DOS_LIB)
 
-$(COMMON_LIB): $(COMMON_DEFINES) $(COMMON_STRINGS) $(HASH) $(COMMON_DIR);
-$(CURSES_LIB): $(HASH) $(COMMON_DEFINES) $(CURSES_DEFINES) $(CURSES_DIR);
-$(SDL_LIB): $(HASH) $(COMMON_DEFINES) $(SDL_DIR);
-$(DUMB_LIB): $(HASH) $(COMMON_DEFINES) $(DUMB_DIR);
-$(BLORB_LIB): $(BLORB_DIR);
+$(COMMON_LIB): $(COMMON_DEFINES) $(COMMON_STRINGS) $(HASH)
+       $(MAKE) -C $(COMMON_DIR)
+
+$(CURSES_LIB): $(COMMON_DEFINES) $(CURSES_DEFINES) $(HASH)
+       $(MAKE) -C $(CURSES_DIR)
+
+$(SDL_LIB): $(COMMON_DEFINES) $(HASH)
+       $(MAKE) -C $(SDL_DIR)
+
+$(DUMB_LIB): $(COMMON_DEFINES) $(HASH)
+       $(MAKE) -C $(DUMB_DIR)
+
+$(BLORB_LIB): $(BLORB_DIR)
 
 $(SUBDIRS):
        $(MAKE) -C $@