Using CMake with GNU Make How can I see the exact commands

Question

I use CMake with GNU Make and would like to see all commands exactly  for example how the compiler is executed  all the flags etc     GNU make has --debug  but it does not seem to be that helpful are there any other options  Does CMake provide additional flags in the generated Makefile for debugging purpose

User · Answer

cmake --build   --verbose On Linux and with Makefile generation  this is likely just calling make VERBOSE 1 under the hood  but cmake --build can be more portable for your build system  e g  working across OSes or if you decide to do e g  Ninja builds later on  mkdir build cd build cmake    cmake --build   --verbose  Its documentation also suggests that it is equivalent to VERBOSE 1   --verbose  -v Enable verbose output - if supported - including the build commands to be executed  This option can be omitted if VERBOSE environment variable or CMAKE VERBOSE MAKEFILE cached variable is set

User · Answer

When you run make  add VERBOSE 1 to see the full command output  For example   cmake   make VERBOSE 1   Or you can add -DCMAKE VERBOSE MAKEFILE BOOL ON to the cmake command for permanent verbose command output from the generated Makefiles   cmake -DCMAKE VERBOSE MAKEFILE BOOL ON   make   To reduce some possibly less-interesting output you might like to use the following options  The option CMAKE RULE MESSAGES OFF removes lines like   33   Building C object     while --no-print-directory tells make to not print out the current directory filtering out lines like make 1   Entering directory and make 1   Leaving directory   cmake -DCMAKE RULE MESSAGES BOOL OFF -DCMAKE VERBOSE MAKEFILE BOOL ON   make --no-print-directory

User · Answer

If you use the CMake GUI then swap to the advanced view and then the option is called CMAKE VERBOSE MAKEFILE

User · Answer

I was trying something similar to ensure the -ggdb flag was present    Call make in a clean directory and grep the flag you are looking for  Looking for debug rather than ggdb I would just write   make VERBOSE 1    grep debug  The -ggdb flag was obscure enough that only the compile commands popped up

User · Answer

Or simply export VERBOSE environment variable on the shell like this   export VERBOSE 1

User · Answer

It is convenient to set the option in the CMakeLists txt file as   set CMAKE VERBOSE MAKEFILE ON

[cmake] Using CMake with GNU Make: How can I see the exact commands?

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