How can I set makefile variables (CC, CFLAGS etc) to terminal or cmd using powershell scripts? - powershell

Question

I want to write platform independent Makefile's environment variable setup script which can set Makefile's environment variable like CC, CFLAGS, LDFLAGS, LD etc. This is my make file. I want to run it on Window or Linux as per the user need. So instead of setting CC, CFLAGS, LDFLAGS, LD every time, I want to write a script which can set the variable for user depending on which platform they are using.
LDFLAG=-L..\..\test\lib
LIBS=-ltestlibs
INCLUDES = ..\..\test\inc
SRCS = $(wildcard *.c)
OBJS = $(SRCS:.c=.o)
EXECUTABLE = targetImage.exe
.PHONY: clean
all: myprog
myprog: $(OBJS)
$(CC) $(OBJS) $(LDFLAG) $(LIBS) -o $(EXECUTABLE)
$(OBJS): $(SRCS) $(INCLUDES)
$(CC) $(CFLAGS) -I$(INCLUDES) -c $(SRCS)
clean:
$(RM) $(OBJS) $(EXECUTABLE)
I know the .sh script but it can be run on CYGWIN or MINGW.
#!/bin/sh
echo "Finding the current OS type"
echo
osType="$(uname -s)"
#osType=$1
case "${osType}" in
"CYGWIN")
{
echo "Running on CYGWIN."
CURRENT_OS=CYGWIN
export CC=""
} ;;
Linux*)
{
echo "Running on Linux."
CURRENT_OS=Linux
export CC="-g -Wall"
} ;;
"MINGW")
{
echo "Running on MINGW."
CURRENT_OS=MINGW
} ;;
"Thor96")
{
source /opt/fsl-imx-xwayland/4.14-sumo/environment-setup-aarch64-poky-linux
CURRENT_OS=THOR96
};;
*)
{
echo "Unsupported OS:${osType}, exiting"
exit
} ;;
esac
echo ${CURRENT_OS}
But it can run on linux only. So how can I achieve the same using powershell .ps1 scripts ? So same script can work on any platform.
I have drafted this .ps1 file for reference but need to update it as I am not sure it's correct or not. Please guide me with proper solution. I am not able to find the proper solution for this.
Function RunOn-Windows
{
Write-Host 'The Script is Running on a Windows Machine'
$Env:CC = "gcc"
}
Function RunOn-Linux
{
Write-Host 'The Script is Running on a Linux Machine'
$Env:CC = "gcc"
}
Function RunOn-Mac
{
Write-Host 'The Script is Running on a Mac'
}
Function RunOn-Other
{
Write-Host 'The Script is Running on a Other'
$Env:CC = "aarch64-poky-linux-gcc"
}
If ($IsWindows)
{RunOn-Windows}
elseif ($IsLinux)
{RunOn-Linux}
elseif ($IsMacOS)
{RunOn-Mac}
else
{RunOn-Other}

Answer 1

I don't have a Windows box to do tests but if yours has GNU make available there is a chance that you can do what you want from inside your Makefile:
# List supported OS (as returned by uname -s, case sensitive)
SUPPORTED_OS := CYGWIN Linux MINGW Darwin
# Get OS
OS := $(shell uname -s)
# Check if OS is supported
ifneq ($(filter-out $(SUPPORTED_OS),$(OS)),)
$(error Unsupported OS: $(OS))
endif
# Define all OS-dependent make variables as OS_VARIABLE
# Linux:
Linux_CC := gcc
Linux_CFLAGS := -g -Wall
Linux_LDFLAGS := ...
# CIGWIN:
CYGWIN_CC := ...
CYGWIN_CFLAGS := ...
CYGWIN_LDFLAGS := ...
...
# Assign make variables
CC := $($(OS)_CC)
CFLAGS := $($(OS)_CFLAGS)
LDFLAGS := $($(OS)_LDFLAGS)