Linking starts before any compilation resulting in undefined reference to main function.

[techie-guy]

What seems to be the problem? Linking starts before any compilation resulting in undefined reference to main function. This problem occurs only If I use the Native platform. It works fine for the Web platform.

The output: On Running make config=debug_native

==== Building test-app (debug_native) ====
Creating bin/Debug-Native/test-app
Linking test-app
clang: error: no input files
make[1]: *** [test-app.make:183: bin/Debug-Native/test-app/test-app] Error 1
make: *** [Makefile:36: test-app] Error 2

On Running make config=debug_web

==== Building test-app (debug_web) ====
Creating bin/Debug-Web/test-app/obj
main.c
Linking test-app

What did you expect to happen? Compilation of the source files should happen first...

What have you tried so far? ...

How can we reproduce this? The premake5 script. I am using the emscripten module

require("emscripten")

workspace "test-app"
    startproject "test-app"

    configurations { "Debug", "Release" }
    platforms { "Native", "Web" }

    filter { "platforms:Native" }
        toolset "clang"
    filter { "platforms:Web" }
        toolset "emcc"

    outputdir = "%{cfg.buildcfg}-%{cfg.platform}"

project "test-app"
    kind "ConsoleApp"
    language "C"
    targetdir "bin/%{outputdir}/%{prj.name}"
    objdir "bin/%{outputdir}/%{prj.name}/obj"
    location "."

    filter { "platforms:Native" }
        defines
        {
            "_PLATFORM_NATIVE"
        }

    filter { "platforms:Web" }
        targetextension ".html"

        defines
        {
            "_PLATFORM_WEB"
        }

    files 
    { 
        "main.c",
    }

    filter "configurations:Debug"
        defines { "DEBUG" }
        symbols "On"

    filter "configurations:Release"
        defines { "NDEBUG" }
        optimize "On"

• [ ] Visual Studio 2022 (vs2022)
• [ ] Visual Studio 2019 (vs2019)
• [ ] Visual Studio 2017 (vs2017)
• [ ] Visual Studio 2015 (vs2015)
• [ ] Visual Studio 2012 (vs2012)
• [ ] Visual Studio 2010 (vs2010)
• [ ] Visual Studio 2008 (vs2008)
• [ ] Visual Studio 2005 (vs2005)
• [ ] GNU Makefile (gmake)
• [X] GNU Makefile 2 (gmake2)
• [ ] XCode (xcode)
• [ ] Codelite
• [ ] Other (Please list below)

What version of Premake are you using?

premake5 (Premake Build Script Generator) 5.0.0-dev

[nickclark2016]

Can you share the generated makefile?

[techie-guy]

I have updated the premake5 script as the earlier one didn't reproduce the issue

[techie-guy]

Also here's the generated test-app.make

# Alternative GNU Make project makefile autogenerated by Premake

ifndef config
  config=debug_native
endif

ifndef verbose
  SILENT = @
endif

.PHONY: clean prebuild

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

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

INCLUDES +=
FORCE_INCLUDE +=
ALL_CPPFLAGS += $(CPPFLAGS) -MD -MP $(DEFINES) $(INCLUDES)
ALL_RESFLAGS += $(RESFLAGS) $(DEFINES) $(INCLUDES)
LIBS +=
LDDEPS +=
ALL_LDFLAGS += $(LDFLAGS)
LINKCMD = $(CC) -o "$@" $(OBJECTS) $(RESOURCES) $(ALL_LDFLAGS) $(LIBS)
define PREBUILDCMDS
endef
define PRELINKCMDS
endef
define POSTBUILDCMDS
endef

ifeq ($(config),debug_native)
ifeq ($(origin CC), default)
  CC = clang
endif
ifeq ($(origin CXX), default)
  CXX = clang++
endif
ifeq ($(origin AR), default)
  AR = ar
endif
TARGETDIR = bin/Debug-Native/test-app
TARGET = $(TARGETDIR)/test-app
OBJDIR = bin/Debug-Native/test-app/obj
DEFINES += -D_PLATFORM_NATIVE -DDEBUG
ALL_CFLAGS += $(CFLAGS) $(ALL_CPPFLAGS) -g
ALL_CXXFLAGS += $(CXXFLAGS) $(ALL_CPPFLAGS) -g

else ifeq ($(config),debug_web)
ifeq ($(origin CC), default)
  CC = emcc
endif
ifeq ($(origin CXX), default)
  CXX = em++
endif
ifeq ($(origin AR), default)
  AR = emar
endif
TARGETDIR = bin/Debug-Web/test-app
TARGET = $(TARGETDIR)/test-app.html
OBJDIR = bin/Debug-Web/test-app/obj
DEFINES += -D_PLATFORM_WEB -DDEBUG
ALL_CFLAGS += $(CFLAGS) $(ALL_CPPFLAGS) -g
ALL_CXXFLAGS += $(CXXFLAGS) $(ALL_CPPFLAGS) -g

else ifeq ($(config),release_native)
ifeq ($(origin CC), default)
  CC = clang
endif
ifeq ($(origin CXX), default)
  CXX = clang++
endif
ifeq ($(origin AR), default)
  AR = ar
endif
TARGETDIR = bin/Release-Native/test-app
TARGET = $(TARGETDIR)/test-app
OBJDIR = bin/Release-Native/test-app/obj
DEFINES += -D_PLATFORM_NATIVE -DNDEBUG
ALL_CFLAGS += $(CFLAGS) $(ALL_CPPFLAGS) -O2
ALL_CXXFLAGS += $(CXXFLAGS) $(ALL_CPPFLAGS) -O2

else ifeq ($(config),release_web)
ifeq ($(origin CC), default)
  CC = emcc
endif
ifeq ($(origin CXX), default)
  CXX = em++
endif
ifeq ($(origin AR), default)
  AR = emar
endif
TARGETDIR = bin/Release-Web/test-app
TARGET = $(TARGETDIR)/test-app.html
OBJDIR = bin/Release-Web/test-app/obj
DEFINES += -D_PLATFORM_WEB -DNDEBUG
ALL_CFLAGS += $(CFLAGS) $(ALL_CPPFLAGS) -O2
ALL_CXXFLAGS += $(CXXFLAGS) $(ALL_CPPFLAGS) -O2

endif

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

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

GENERATED :=
OBJECTS :=

ifeq ($(config),debug_web)
GENERATED += $(OBJDIR)/main.o
OBJECTS += $(OBJDIR)/main.o

else ifeq ($(config),release_web)
GENERATED += $(OBJDIR)/main.o
OBJECTS += $(OBJDIR)/main.o

endif

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

all: $(TARGET)
    @:

$(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 test-app
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)) del /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) $(CC) -x c-header $(ALL_CFLAGS) -o "$@" -MF "$(@:%.gch=%.d)" -c "$<"
$(PCH_PLACEHOLDER): $(GCH) | $(OBJDIR)
ifeq (posix,$(SHELLTYPE))
    $(SILENT) touch "$@"
else
    $(SILENT) echo $null >> "$@"
endif
else
$(OBJECTS): | prebuild
endif

ifeq ($(config),debug_native)
$(TARGET): $(OBJECTS) $(LDDEPS) | $(TARGETDIR)
    $(PRELINKCMDS)
    @echo Linking test-app
    $(SILENT) $(LINKCMD)
    $(POSTBUILDCMDS)

else ifeq ($(config),debug_web)
$(TARGET): $(GENERATED) $(OBJECTS) $(LDDEPS) | $(TARGETDIR)
    $(PRELINKCMDS)
    @echo Linking test-app
    $(SILENT) $(LINKCMD)
    $(POSTBUILDCMDS)

else ifeq ($(config),release_native)
$(TARGET): $(OBJECTS) $(LDDEPS) | $(TARGETDIR)
    $(PRELINKCMDS)
    @echo Linking test-app
    $(SILENT) $(LINKCMD)
    $(POSTBUILDCMDS)

else ifeq ($(config),release_web)
$(TARGET): $(GENERATED) $(OBJECTS) $(LDDEPS) | $(TARGETDIR)
    $(PRELINKCMDS)
    @echo Linking test-app
    $(SILENT) $(LINKCMD)
    $(POSTBUILDCMDS)

endif

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

ifeq ($(config),debug_web)
$(OBJDIR)/main.o: main.c
    @echo "$(notdir $<)"
    $(SILENT) $(CC) $(ALL_CFLAGS) $(FORCE_INCLUDE) -o "$@" -MF "$(@:%.o=%.d)" -c "$<"

else ifeq ($(config),release_web)
$(OBJDIR)/main.o: main.c
    @echo "$(notdir $<)"
    $(SILENT) $(CC) $(ALL_CFLAGS) $(FORCE_INCLUDE) -o "$@" -MF "$(@:%.o=%.d)" -c "$<"

endif

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

[nickclark2016]

You need to close/reset the filter, as the filters affect everything after it. When you're done applying filters, use filter {} and that should fix it.

[techie-guy]

Ohh, I see. Thanks for your help!