URL:
<http://savannah.gnu.org/bugs/?37069>
Summary: POSIX specifies CC=c99
Project: make
Submitted by: None
Submitted on: Fri 10 Aug 2012 10:01:17 AM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 3.82
Operating System: POSIX-Based
Fixed Release: None
Triage Status: None
_______________________________________________________
Details:
The POSIX standard for make includes a number of predefined macros, including
CC=c99
where c99 is an ISO C99-compliant compiler. On a typical GNU system, c99 is a
script that runs gcc -std=c99 ..., which fits the bill.
GNU make uses CC=cc, which on a GNU system will be a link to GCC, which still
doesn't use the 1999 standard by default.
Even if there is a specific reason for the use of CC=cc instead of CC=c99 (and
if so, I'd be interested to hear why), POSIX specifies that by adding a dummy
target of .POSIX, make shall conform to the standard, so users that explicitly
add that target should see CC=c99.
Here is a shell script to create a C99 program and a makefile that requests
POSIX standards compliance. When make runs on the last line, you'll get errors
about GCC not running in c99 mode.
cat > ninetynine.c << "-----"
#include <stdio.h>
int main(){
for (int i=0; i< 10; i++) printf("Hello.\n");
}
-----
cat > makefile << "-----"
CFLAGS=-g -Wall
#use the default build rule.
ninetynine:
#This rule requests standards-compliant behavior from make
.POSIX:
-----
make
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?37069>
_______________________________________________
Message sent via/by Savannah
http://savannah.gnu.org/
_______________________________________________
Bug-make mailing list
Bug-make@gnu.org
https://lists.gnu.org/mailman/listinfo/bug-make
