Description Zack Kesabtsi 2021-10-20 11:17:06 EDT

It is a very common practice to have C/C++ source files in the same folder having the same name but different extensions - e.g timer.c, timer.S, timer.cpp, timer.cxx etc.

In any given folder if there are two source files having the same name but different extensions, then the auto generated makefile produces only one object file (i.e. timer.o) and, if lucky enough, it generates the following warning:

library/timer/subdir.mk:31: warning: overriding recipe for target 'library/timer/timer.o'
library/timer/subdir.mk:24: warning: ignoring old recipe for target 'library/timer/timer.o'

>>>>> In the subdir.mk file it produces something like:

# Add inputs and outputs from these tool invocations to the build variables 
CXX_SRCS += \
..../library/timer/timer.cxx       <<<< source file with .cxx extension

CPP_SRCS += \
..../library/timer/timer.cpp       <<<< source file with .cpp extension

OBJS += \
./library/timer/timer.o            <<<< only one .o file <<< is the problem

CXX_DEPS += \
./library/timer/timer.d 

CPP_DEPS += \
./library/timer/timer.d

obviously, it is not difficult to change the names, but I think this is bug and can easily be modified to have the file extension included in the .o files - e.g. timer-cxx.o, timer-cpp.o etc.