define variable preprocessor (CPPFLAGS) in make comand line

[stoikos]

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

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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

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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?

[stoikos]

C++ uses CXXFLAGS while C uses CPPFLAGS

[ESP_igrr]

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

[stoikos]

so for C++ I need to add EXTRA_CXXFLAGS?

[ESP_igrr]

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

[stoikos]

it worked ! thank you!