The INCPATH and LIBPATH variables you have defined are probably redundant:
gcc should automatically be searching those directories for header files
and libraries already. (You can run `gcc -print-search-dirs | grep
libraries` to see which directories are searched for libraries. You can
run `gcc -E -v test.c` to see where it is searching for header files.)
You can run the pkg-config utility to get the arguments needed to SDL2.
For example, try running:
pkg-config --cflags --libs sdl2
Here is a shell command I ran to build a single-file SDL2 program I was
working on recently:
gcc -g -Wall -Wextra -std=c11 -O2 main.c $(pkg-config --cflags --libs
sdl2) -o output
Since it's just one command, a shell script is fine and you don't really
need a Makefile. But the syntax to run pkg-config in your Makefile would
be:
$(shell pkg-config --cflags --libs sdl2)
If you need to depend on more libraries, just add their names onto the end
of the pkg-config command.
I don't think you need to detect the operating system in your Makefile.
It's easy enough to do it with a few #ifdef directives in your source file
if you need to.
--David
On Tue, Mar 12, 2019 at 4:08 AM Valerio Messina via Msys2-users <
msys2-users@lists.sourceforge.net> wrote:
> hi,
> I want to use a single Makefile for three platforms (Linux64, MinGw64,
> MinGw32) to generate a simple binary (using SDL2).
> The source is a single .c file, so use Automake, Autoconf is too heavy.
>
> As now I concentrated the differences only in three variables:
> INCPATH
> LIBPATH
> LDFLAGS
> that have minor variations for path reason.
>
>
>
> Is there a Makefile trick to take in account differences for those three
> platforms?
>
>
> thank you.
>
>
>
> INCPATH=/usr/local/include # Linux64
> INCPATH=/mingw64/include # MinGw64
> INCPATH=/mingw32/include # MinGw32
> CC = gcc
> CFLAGS = -std=gnu11 -Wall -c -O3 -I$(INCPATH)
> LD = $(CC)
> LIBPATH=/usr/lib/x86_64-linux-gnu # Linux64
> LIBPATH=/mingw64/lib # MinGw64
> LIBPATH=/mingw32/lib # MinGw32
> SDL_LIB = -L$(LIBPATH) -lSDL2main -lSDL2 -Wl,-rpath=$(LIBPATH)
> LDFLAGS = -lmingw32 $(SDL_LIB) -lm # MinGw32/64
> LDFLAGS = $(SDL_LIB) -lm # Linux64
> FILE = spectra
> SOURCE = $(FILE)
> TARGET = $(FILE)
>
> all: $(TARGET)
>
> $(TARGET): $(SOURCE).o
> $(LD) $< $(LDFLAGS) -o $@
>
> $(SOURCE).o: $(SOURCE).c
> $(CC) $(CFLAGS) $< -o $@
>
> clean:
> rm *.o && rm $(TARGET)
>
>
> --
> Valerio
>
>
> _______________________________________________
> Msys2-users mailing list
> Msys2-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/msys2-users
>
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