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Questions - m4

Why does clock() returns -1 in C

I'm trying to implement an error handler using the clock() function from the "time.h" library. The code runs inside an embeeded system (Colibri IMX7 - M4 Processor). The function is used to ...
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Victor Hugo Martins Marques

gcc

bare-metal

m4

arm-none-eabi-gcc

imx7

Votes: 0

Answers: 3

Latest Answer

To answer the second part of your question: static clock_t start_time = clock(); is not allowed because the return value of the function clock() is not known until runtime, but in C the initializer o...
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Tom V

Autoconf loop but stop after first success?

I've got this snippet to detect and require the highest usable C++ standard. It works exactly the way I want it to - checks highest first, and stop searching after the first success. It's also extreme...
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Tino Didriksen

configure

autotools

autoconf

m4

Votes: 0

Answers: 1

Latest Answer

From what I can find, m4 simply cannot loop. It can recurse, but breaking out of a recursion is the kind of m4 black magic that I apparently can't get to work. M4 absolutely can loop, but you don't ...
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John Bollinger

Conditionally defining macro in m4 within ifdef

This is the first time I'm using m4, and I'm having difficulty in defining a macro conditionally based on whether or not another macro is already defined. The problem I'm facing is with the following ...
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Abhishek Chakravarti

m4

Votes: 0

Answers: 1

Latest Answer

Try this: ifdef(`MANPAGE', `define(_NAME, `NAME')', `define(_NAME, `Name')') I believe the parameters get expanded before passing to ifdef
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basin

Display preprocessor output just processing the conditional compilation directives

I've got a c program that has grown organically over a long period of time to support multiple different targets using #if #else #elif and #endif directives. How would I use the gcc preprocessor (or t...
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Mike T.

c-preprocessor

m4

Votes: 0

Answers: 0

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