ESP32 Forum

Posted: **Mon Nov 19, 2018 8:10 pm**

Hi,
I would like to be able to #define variables from the make command line. I tried

make -j12 CPPFLAGS+='-Dvar' all

and other combinations (CPPFLAGS='-Dvar', etc )and it seems that although the #define succeeds, it doesnt pick up other #defines that exist in the makefile and the compilation fails completely or I get some weird messages such as

Code: Select all

esp_http_client.c:(.text+0x1a96): dangerous relocation: call8: call target out of range: esp_log_timestamp

What is the correct way to #define a variable in the make command line?

Posted: **Mon Nov 19, 2018 11:11 pm**

C++ uses CXXFLAGS while C uses CPPFLAGS

Posted: **Mon Nov 19, 2018 11:58 pm**

On Make command line, or in the project makefile, you can use EXTRA_CPPFLAGS — these will be appended to CPPFLAGS without replacing anything.

Posted: **Tue Nov 20, 2018 12:57 am**

so for C++ I need to add EXTRA_CXXFLAGS?

Posted: **Tue Nov 20, 2018 1:23 am**

CPPFLAGS are preprocessor flags, then apply both to C and C++. CFLAGS apply to C. CXXFLAGS apply to C++. Same with EXTRA_...

Posted: **Tue Nov 20, 2018 5:40 am**

it worked ! thank you!

ESP32 Forum

define variable preprocessor (CPPFLAGS) in make comand line

define variable preprocessor (CPPFLAGS) in make comand line

[SOLVED] Re: define variable preprocessor (CPPFLAGS) in make comand line

Re: define variable preprocessor (CPPFLAGS) in make comand line

Re: define variable preprocessor (CPPFLAGS) in make comand line

Re: define variable preprocessor (CPPFLAGS) in make comand line

Re: define variable preprocessor (CPPFLAGS) in make comand line