I am using different environment variables for each compiler in my bash 
profile. I then import the respective variable in the respective tup 
variant and assign it to a variable I call COMPILER. That $(COMPILER) 
variable is then used in the rule. This way, each variant can create 
complete custom setups, including compiler options, etc. for each platform 
I am building.

So, for example, for OSX, it will look like this...
ifdef OSX
import PROJECT_OSX_COMPILER=gcc

COMPILER = $(PROJECT_OSX_COMPILER)

CFLAGS += -fdiagnostics-color=always
CFLAGS += -mmacosx-version-min=10.13
endif 

For Windows, for example, it will then look like this
ifdef WIN32
import PROJECT_WIN32_COMPILER=clang
import PROJECT_WIN32_SYSTEM_INCLUDE

COMPILER = $(PROJECT_WIN32_COMPILER)
OUTNAME = libogg.lib

CFLAGS += -target x86_64-pc-win32
CFLAGS += -fdeclspec
CFLAGS += -D_CRT_SECURE_NO_WARNINGS
CFLAGS += -D_CRT_NONSTDC_NO_DEPRECATE
CFLAGS += -DWIN32_LEAN_AND_MEAN

CFLAGS += -isystem "$(PROJECT_WIN32_SYSTEM_INCLUDE)"
endif

and so on...

This is not exactly what you're asking but, perhaps, it will give you an 
idea for a different approach.

Guido

On Tuesday, November 1, 2022 at 8:11:31 AM UTC-7 Satish K wrote:

Hello,

I have several projects using different versions of the same compiler. 
Since Tup takes the PATH from system environment on windows, it will find 
the first one in the PATH that matches the name and uses it. I know that I 
can use different system environment variables specific to compiler version 
to get around this behavior.

 However, we have a simple practice of using batch files to set the Path 
before executing makefile. Is it possible to use batch files to set the 
compiler path before invoking Tup ? 

Thanks,
Satish K

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