Change the SHELL used in TI Code Composer Studio's auto-generated Makefiles on Windows 10 - code-composer

Question

I need the makefile generated by TI Code Composer Studio 10 to use SHELL = sh.exe instead of SHELL = cmd.exe. The insertion of the SHELL line seems to be specific to TI and not Eclipse. I can't figure out how to do this. I've tried setting environment variables at the system level and in the project build settings. I've tried running TI CCS from a bash shell hoping it might pick up its own environment. I've also looked through the Eclipse sources for generating the makefile.
Example:
Everything from SHELL to just before the -include line is TI specific.
################################################################################
# Automatically-generated file. Do not edit!
################################################################################
SHELL = cmd.exe
CG_TOOL_ROOT := C:/ti/ccs1040/ccs/tools/compiler/ti-cgt-msp430_20.2.5.LTS
GEN_OPTS__FLAG :=
GEN_CMDS__FLAG :=
ORDERED_OBJS += \
"./msp430fr60x7_1.obj" \
"../lnk_msp430fr6047.cmd" \
$(GEN_CMDS__FLAG) \
-llibmpu_init.a \
-llibmath.a \
-llibc.a \
-include ../makefile.init
Reason: gmake creates batch files for commands like echo and our computers have security software that block randomly created batch files from running. If run from bash/sh, gmake doesn't use intermediate batch files.
Update: I may have a workaround by telling the project to invoke gmake like this: sh.exe -c gmake.exe args. That isn't working fully though as the args do not get passed.

Answer 1

After confirming with TI that the SHELL is hardcoded, this workaround is the solution.
You'll need to:
Create a make.sh shell script to run the real gmake.exe
Create a makefile.defs to fix some SHELL and RM variables inside the TI generated makefile
Install another sh.exe. I used the one installed with Git for Windows. The cygwin sh.exe that comes with the TI compiler doesn't work. This is a shame, because it would be nice to have a solution not requiring another tool.
First, modify your project build settings to run the make script. In TI Code Composer Studio:
Project Menu -> Show Build Settings -> CCS Build -> Builder
[ ] Uncheck "Use default build command"
Build Command: C:/Progra~1/Git/bin/sh.exe ${PROJECT_ROOT}/make.sh ${CCS_UTILS_DIR}/bin/gmake -k -j 8
Note: You have to use the MS-DOS short path for "Program Files," because it's 2021, and Eclipse can't handle spaces in a path.
Create make.sh in the PROJECT_ROOT directory:
#!C:/Progra~1/Git/bin/sh.exe
# The cygwin provided shell from TI doesn't work with make. Use the one from Git instead or even SourceTree's embedded Git shell.
# In TI CCS, Project -> Show Build Settings -> CCS Build -> Builder -> Build Command (Uncheck Use default build command)
# Build Command: C:/Progra~1/Git/bin/sh.exe ${PROJECT_ROOT}/make.sh ${CCS_UTILS_DIR}/bin/gmake -k -j 8
echo "$#"
# debugging
#echo $#
#env | sort
if [ $# -eq 0 ]; then
echo Nothing to do. >&2
exit
fi
export MAKESHELL="$SHELL"
# echo MAKESHELL is \'$MAKESHELL\' inside the script, but will be translated to the DOS path inside make.
"$#"
Create makefile.defs in the PROJECT_ROOT directory. The Eclipse generated makefile includes this file at the very end allowing it to override any settings set by TI.
# The invoking shell sets MAKESHELL so we can grab it here.
SHELL = $(MAKESHELL)
RM = rm -f
$(info "MAKEFLAGS is $(MAKEFLAGS)")
$(info "MAKECMDGOALS is $(MAKECMDGOALS)")
# $(info "SHELL is $(SHELL)")
# $(info "CWD is $(CWD)")
# $(info "PATH is ${PATH}")