CODEWITHSUNDEEP
cgccinclude
José Angel Neria Pérez
José Angel Neria Pérez

Reputation: 131

Error when compiling in gcc, expected identifier '(' before 'double'

I'm trying to compile the attached C code with

gcc -Wall -o nesta.o nesta.c

but I'm getting the following error:

nesta.c: At top level:
nesta.c:1004:15: error: expected identifier or ‘(’ before ‘double’
void restrict(double *coarse, double *fine,int imaxc,int jmaxc,int imaxf,int jmaxf)

As a side note, this is an old C program that used to work back in 1997.

nesta.c praxis.h

Upvotes: 0

Views: 800

Answers (1)

Jonathan Leffler
Jonathan Leffler

Reputation: 754280

Your code appears to use a function name restrict, judging from the error message.

C99 introduced that as a keyword.

You'll need to force C90 mode in your compiler in the (very) short term; in the medium term, you'll need to rename the function so it doesn't match a keyword.

This is why the standards committee are reluctant to add keywords; they break existing working code (but at least it is a noisy breakage). It's not unreasonable that the code worked in 1997, before the C99 standard was finalized — it's likewise not unreasonable that it no longer compiles; restrict has been part of the standard for nearly 20 years now.

Upvotes: 1

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