CODEWITHSUNDEEP
cgccmakefileada
Dr. Watson
Dr. Watson

Reputation: 3820

How can I disable fail on warning when using GCC and Make?

I'm trying to build GCC for use with an AVR microcontroller and avr-ada, and I've hit a roadblock caused by my regular compiler being too picky about the version I needed for the AVR. I get the following warning, which in turn causes GCC or Make to report an error:

gcc -c -g -O2 -gnatpg -gnata -nostdinc -I- -I. -Iada
  -I../../gcc/ada ../../gcc/ada/exp_ch5.adb -o ada/exp_ch5.o
exp_ch5.adb:177:16: warning: function "Has_Address_Clause" is not referenced
make[2]: *** [ada/exp_ch5.o] Error 1
make[1]: *** [all-gcc] Error 2
make: *** [all] Error 2

Is there a way to instruct GCC or Make to not fail on warnings?

Upvotes: 18

Views: 87714

Answers (7)

user275257
user275257

Reputation: 41

Put "pragma warnings(off, "...")" into the offending parts of your code.

See http://www.adacore.com/2007/11/19/ada-gem-18/.

Upvotes: 0

Jack
Jack

Reputation: 161

As an alternative to diving into the build system, try setting -Wno-error in CFLAGS, which you should be able to do through the environment (or at configure time, if using the GNU build system).

Upvotes: 16

ZelluX
ZelluX

Reputation: 72605

It seems the -Werror flag is set in the Makefile. Maybe you can look for the CFLAGS options in the Makefile and remove the -Werror flag. The Werror flag will make all warnings into errors.

Upvotes: 5

Simon Wright
Simon Wright

Reputation: 25491

The trigger here is the -gnatpg (actually, the -gnatg): this is the "GNAT implementation mode (used for compiling GNAT units)". -gnatp means "suppress all checks".

I'm not sure of the full effect of -gnatg, though it certainly causes warnings to be treated as errors -- like -Werror -- at any rate while building the compiler itself; I think I remember seeing non-fatal warnings while building the RTS.

One possibility would be to compile just exp_ch5.adb by hand without -gnatg; the command you list was issued at gcc/, so

$ cd gcc
$ gcc -c -g -O2 -gnatp -gnata -nostdinc -I- -I. -Iada -I../../gcc/ada \
  ../../gcc/ada/exp_ch5.adb -o ada/exp_ch5.o

Then back up one level, and 'make' again.

This is a cross-compiler, so you won't (I hope!) need to repeat this for all three stages of a full build.

Upvotes: 7

Bob Blogge
Bob Blogge

Reputation: 188

In gcc configure you can add --disable-werror.

Though it's advisable to seek out a proper patch first.

Upvotes: 2

ezpz
ezpz

Reputation: 12027

In general, it is not a good idea to ignore warnings from your compiler. However, if this is a portion of a larger make process there is likely a -Werror flag inserted earlier in the sequence. Start by looking for that.

After looking around, there seems to be a wealth of flags to control warnings while compiling Ada code. For instance, -gnatwF will Suppress warnings on unreferenced formals according to this guide. Possibly the switch you require can be found in the list provided there.

Upvotes: 3

Dirk is no longer here
Dirk is no longer here

Reputation: 368201

Try make -k instead of just make. That will 'continue' rather than stop.

Upvotes: 56

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