[Solution]Makefile where to add compile flags
Requirement: In a project, we need to add some compile flags in order to meet the security requirement or other reasons.
In my project, there are two kinds of Makefile. I will introduce them later.
First, let me introduce the basic concept.
- In most cases, we can add compile flag into CFALGS in compile stage and add compile flag into LDFLAGS in link stage.
- Add these flags to gcc command. Refer to the following($(CC) means your compiler):
- $(CC) xxx xxx $(CFLAGS) xxx xxx
- $(CC) xxx xxx $(CFLAGS) $(LDFLAGS) xxx xxx
In a quick summary: You need to find CFLAGS, LDFLAGS and compile command, then add your compile flags into CFLAGS and LDFLAGS, then add CFLAGS, LDFLAGS to compile command. Of course you can add compile flags into compile command directly.
Case 1:
Nothing special, you just have a Makefile, then you need to add your compile flags.
Step 1: Find the CFLAGS and LDFLAGS or maybe other name CCFLAGS. They are just a name. In most cases, It is CFLAGS and LDFLAGS.
Step 2: Add the compile flags you want to CFLAGS or LDFLAGS. (such as “-fstack-protector-strong” for stack protected, “-Wl,-z,relro” for Read-only relocations, “-Wl,-z,now” for Immediate binding)
- CFLAGS=”-fstack-protector-strong”
- CFLAGS+=”-fstack-protector”
- DLFLAGS=”-Wl,-z, now”
Option:
You can add your compile flags into compile command directly. Refer to the following:
$(CC) [other options] -fstack-protector -Wl,-z,relro,-z,now
Case 2:
You have an open source component and a Makefile outside of this component. Also there is a Makefile in this open source code.
Actually, It uses configure to create makefile.
Such as Monit component:
->Makefile (We write this makefile to add Monit component to our project)
->Makefile (We write this makefile to add Monit component to our project)
->Monit
->Makefile(created by configure file)What we need to do is to modify the Makefile outside this open source code. Refer to the following:
CFG = [other options] CFLAGS=”-fstack-protector-strong”
Then,
./configure $(CFG);
NOW, I have already introduced how to add compile flag in two kinds of Makefile. Hope it is useful for you.
Note:
As for the difference between “=, :=, +=” in Makefile, please refer to this quesiton.
Reference:
https://www.keil.com/support/man/docs/armclang_ref/armclang_ref_cjh1548250046139.htm
https://wiki.ubuntu.com/ToolChain/CompilerFlags
https://stackoverflow.com/questions/39898815/makefile-where-to-add-compile-flags?noredirect=1&lq=1
Have a good day, Take care!
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