GCC 13.2.0 compilation of simple C code that includes offloading to NVIDIA GPU fails

[DemetriosG]

Binary Version: GCC 13.2.0 (with POSIX threads) + LLVM/Clang/LLD/LLDB 17.0.6 + MinGW-w64 11.0.1 (UCRT) - release 5 (LATEST) for win64

Compilation command: gcc -lm -g -Wall -fopenmp -foffload=nvptx-none sum.c -o sum.exe

Compilation error: lto-wrapper.exe: fatal error: could not find accel/nvptx-none/mkoffload in C:/tmp/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/13.2.0/;C:/tmp/mingw64/bin/../libexec/gcc/;C:/tmp/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/13.2.0/../../../../x86_64-w64-mingw32/bin/ (consider using '-B') compilation terminated. C:/tmp/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/13.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: error: lto-wrapper failed collect2.exe: error: ld returned 1 exit status

C code:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <omp.h>

int main(int argc, char *argv[]) {
	long long int j, largeN;
	double sum = 0.0;
	clock_t tstart, tend;
	int num_dev;

	num_dev = omp_get_num_devices();

	printf("%d\n", num_dev);

	largeN = (long long int) atoll(argv[1]);

	printf("Large Number = %lld\n", largeN);

	tstart = clock();
#pragma omp parallel for private(j) reduction(+:sum)
	for(j=1; j<largeN; j++) {
		sum += (double) (1.0/j);
	}
	tend = clock();
	printf("Sum [1, ... , %lld] = %.6f\n", largeN, sum);
	printf("\nCompleted in %.2f seconds%45s\n\n", ( (double) (tend - tstart) ) / CLOCKS_PER_SEC, "");

	sum = 0.0;
	tstart = clock();
#pragma omp target map(to:largeN) map(tofrom:sum)
#pragma omp parallel for simd private(j) reduction(+:sum)
	for (j=1; j<largeN; j++) {
		sum += (double) (1.0/j);
	}
	tend = clock();
	printf("Sum [1, ... , %lld] = %.6f\n", largeN, sum);
	printf("\nCompleted in %.2f seconds%45s\n\n", ( (double) (tend - tstart) ) / CLOCKS_PER_SEC, "");

	return(0);
}

A remedy would be greatly appreciated.

[brechtsanders]

I have not been able to build GCC nvptx offloading since 10.3.0.

Unfortunately I never found enough time to deepdive into why exactly it won't build.

[DemetriosG]

Many thanks for the response, Brecht. I fully understand the time constraints.

Demetrios

From: Brecht Sanders @.> Sent: Monday, March 4, 2024 11:28 AM To: brechtsanders/winlibs_mingw @.> Cc: Gatziolis, Demetrios - FS, OR @.>; Author @.> Subject: Re: [brechtsanders/winlibs_mingw] GCC 13.2.0 compilation of simple C code that includes offloading to NVIDIA GPU fails (Issue #184)

I have not been able to build GCC nvptx offloading since 10.3.0.

Unfortunately I never found enough time to deepdive into why exactly it won't build.

Reply to this email directly, view it on GitHubhttps://github.com/brechtsanders/winlibs_mingw/issues/184#issuecomment-1977304069, or unsubscribehttps://github.com/notifications/unsubscribe-auth/A6FSJW3I52IQTCYVTAGJLETYWTDLDAVCNFSM6AAAAABD5PVQF2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNZXGMYDIMBWHE. You are receiving this because you authored the thread.Message ID: @.@.>>

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