Makefiles do not support .c++ files

[Tom Yaxley]

What seems to be the problem?
I'm making a premake script for cap'n'proto and it uses the .c++ extension for its C++ source files. Adding these as files works fine in VS, but do not get picked up by the gmake2 generator.

workspace "Foo"
	configurations { "Debug" }
	project "Baz"
		kind "StaticLib"
		files { "test1.cpp", "test2.c++" }

$ premake5 gmake2 && make
Building configurations...
Running action 'gmake2'...
Generated Makefile...
Generated Baz.make...
Done (36ms).
"==== Building Baz (debug) ===="
Creating obj
test1.cpp
Creating bin/Debug
Linking Baz

What did you expect to happen?
I expected to see test2.c++ show up in the file list above.

What have you tried so far?
I tried to use a buildaction to specify that .c++ files should be compiled but that didn't seem to work.

filter "files:**.c++"
	buildaction "Compile"

What version of Premake are you using?
Note that although this says I am using a -dev version, I grabbed it directly from premake-5.0.0-beta2-linux.tar.gz

$ ./premake5 --version
premake5 (Premake Build Script Generator) 5.0.0-dev

Anything else we should know?

Generated Makefile:

# Alternative GNU Make workspace makefile autogenerated by Premake

ifndef config
  config=debug
endif

ifndef verbose
  SILENT = @
endif

ifeq ($(config),debug)
  Baz_config = debug

else
  $(error "invalid configuration $(config)")
endif

PROJECTS := Baz

.PHONY: all clean help $(PROJECTS) 

all: $(PROJECTS)

Baz:
ifneq (,$(Baz_config))
	@echo "==== Building Baz ($(Baz_config)) ===="
	@${MAKE} --no-print-directory -C . -f Baz.make config=$(Baz_config)
endif

clean:
	@${MAKE} --no-print-directory -C . -f Baz.make clean

help:
	@echo "Usage: make [config=name] [target]"
	@echo ""
	@echo "CONFIGURATIONS:"
	@echo "  debug"
	@echo ""
	@echo "TARGETS:"
	@echo "   all (default)"
	@echo "   clean"
	@echo "   Baz"
	@echo ""
	@echo "For more information, see https://github.com/premake/premake-core/wiki"

Generated Baz.make:

# Alternative GNU Make project makefile autogenerated by Premake

ifndef config
  config=debug
endif

ifndef verbose
  SILENT = @
endif

.PHONY: clean prebuild

SHELLTYPE := posix
ifeq (.exe,$(findstring .exe,$(ComSpec)))
	SHELLTYPE := msdos
endif

# Configurations
# #############################################

RESCOMP = windres
TARGETDIR = bin/Debug
TARGET = $(TARGETDIR)/Baz.lib
OBJDIR = obj
DEFINES +=
INCLUDES +=
FORCE_INCLUDE +=
ALL_CPPFLAGS += $(CPPFLAGS) -MMD -MP $(DEFINES) $(INCLUDES)
ALL_CFLAGS += $(CFLAGS) $(ALL_CPPFLAGS)
ALL_CXXFLAGS += $(CXXFLAGS) $(ALL_CPPFLAGS)
ALL_RESFLAGS += $(RESFLAGS) $(DEFINES) $(INCLUDES)
LIBS +=
LDDEPS +=
ALL_LDFLAGS += $(LDFLAGS) -s
LINKCMD = $(AR) -rcs "$@" $(OBJECTS)
define PREBUILDCMDS
endef
define PRELINKCMDS
endef
define POSTBUILDCMDS
endef

# Per File Configurations
# #############################################


# File sets
# #############################################

GENERATED :=
OBJECTS :=

GENERATED += $(OBJDIR)/test1.o
OBJECTS += $(OBJDIR)/test1.o

# Rules
# #############################################

all: $(TARGET)
	@:

$(TARGET): $(GENERATED) $(OBJECTS) $(LDDEPS) | $(TARGETDIR)
	$(PRELINKCMDS)
	@echo Linking Baz
	$(SILENT) $(LINKCMD)
	$(POSTBUILDCMDS)

$(TARGETDIR):
	@echo Creating $(TARGETDIR)
ifeq (posix,$(SHELLTYPE))
	$(SILENT) mkdir -p $(TARGETDIR)
else
	$(SILENT) mkdir $(subst /,\\,$(TARGETDIR))
endif

$(OBJDIR):
	@echo Creating $(OBJDIR)
ifeq (posix,$(SHELLTYPE))
	$(SILENT) mkdir -p $(OBJDIR)
else
	$(SILENT) mkdir $(subst /,\\,$(OBJDIR))
endif

clean:
	@echo Cleaning Baz
ifeq (posix,$(SHELLTYPE))
	$(SILENT) rm -f  $(TARGET)
	$(SILENT) rm -rf $(GENERATED)
	$(SILENT) rm -rf $(OBJDIR)
else
	$(SILENT) if exist $(subst /,\\,$(TARGET)) del $(subst /,\\,$(TARGET))
	$(SILENT) if exist $(subst /,\\,$(GENERATED)) rmdir /s /q $(subst /,\\,$(GENERATED))
	$(SILENT) if exist $(subst /,\\,$(OBJDIR)) rmdir /s /q $(subst /,\\,$(OBJDIR))
endif

prebuild: | $(OBJDIR)
	$(PREBUILDCMDS)

ifneq (,$(PCH))
$(OBJECTS): $(GCH) | $(PCH_PLACEHOLDER)
$(GCH): $(PCH) | prebuild
	@echo $(notdir $<)
	$(SILENT) $(CXX) -x c++-header $(ALL_CXXFLAGS) -o "$@" -MF "$(@:%.gch=%.d)" -c "$<"
$(PCH_PLACEHOLDER): $(GCH) | $(OBJDIR)
ifeq (posix,$(SHELLTYPE))
	$(SILENT) touch "$@"
else
	$(SILENT) echo $null >> "$@"
endif
else
$(OBJECTS): | prebuild
endif


# File Rules
# #############################################

$(OBJDIR)/test1.o: test1.cpp
	@echo $(notdir $<)
	$(SILENT) $(CXX) $(ALL_CXXFLAGS) $(FORCE_INCLUDE) -o "$@" -MF "$(@:%.o=%.d)" -c "$<"

-include $(OBJECTS:%.o=%.d)
ifneq (,$(PCH))
  -include $(PCH_PLACEHOLDER).d
endif

[Joris Dauphin]

filter { "files:**.c++" }
	compileas "C++"

Should do the trick for gmake2. (not or partially supported by other generators).

See compileas for details.

[Nick Clark]

@tommitytom Please confirm if this works

[Nick Clark]

Nudging this to see if it resolved the issue.