oh, bad news... I was expecting this to be fixed in 1.7...
On Wed, Jun 22, 2016 at 10:33 PM <saurabh.deo...@gmail.com> wrote:
> I am having the same issues with go1.6.2... I also tried go1.7beta2 with
> no luck.
> C:\Go\pkg\tool\windows_amd64\link.exe: running gcc failed: exit status 1
>
> c:/program files/mingw-w64/x86_64-4.8.1-posix-seh-rt_v3-rev2/mingw64/bin
> /../lib/gcc/x86_64-w64-mingw32/4.8.1/../../../../x86_64-w64-mingw32/lib
> /../lib/libntdll.a(dmads01971.o):(.idata$5+0x0): multiple definition of
> `__imp_sqrt'
> c:/program
> files/mingw-w64/x86_64-4.8.1-posix-seh-rt_v3-rev2/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/4.8.1/../../../../x86_64-w64-mingw32/lib/../lib/libmsvcrt.a(dygcs01179.o):(.idata$5+0x0):
> first defined here
>
>
>
> On Wednesday, April 20, 2016 at 7:06:28 PM UTC-7, Dorival Pedroso wrote:
>>
>> Hi,
>>
>> I'm just wondering what is the cause of the following error (multiple
>> definition of __something)?
>> C:\Go\pkg\tool\windows_amd64\link.exe: running gcc failed: exit status 1
>> C:/TDM-GCC-64/bin/../lib/gcc/x86_64-w64-mingw32/5.1.0/../../../../x86_64-w64-mingw32/lib/../lib/libntdll.a(dyyls01966.o):(.idata$5+0x0):
>> multiple definition of `__imp_pow'
>>
>> This only happens on Windows10 but on Ubuntu/Linux.
>>
>> The Go code makes a call to LAPACK via a C interface as follows:
>> package main
>>
>> /*
>> #cgo CFLAGS: -O3
>> #cgo linux LDFLAGS: -lm -llapack -lgfortran -lblas
>> #cgo windows LDFLAGS: -lm -llapack -lgfortran -lblas -LC:/GoslDeps/lib
>>
>> #include <stdlib.h>
>>
>> void dgesvd_(const char* jobu, const char* jobvt, const int* M, const
>> int* N, double* A, const int* lda, double* S, double* U, const int* ldu,
>> double* VT, const int* ldvt, double* work,const int* lwork, const int*
>> info);
>>
>> int lapack_svd(double *U, double *S, double *Vt, long m_long, double *A) {
>> int m = (int)(m_long);
>> int info = 0;
>> char job = 'A';
>> int lwork = 10*m;
>> double* work = (double*)malloc(lwork*sizeof(double));
>> dgesvd_(&job, // JOBU
>> &job, // JOBVT
>> &m, // M
>> &m, // N
>> A, // A
>> &m, // LDA
>> S, // S
>> U, // U
>> &m, // LDU
>> Vt, // VT
>> &m, // LDVT
>> work, // WORK
>> &lwork, // LWORK
>> &info); // INFO
>> free(work);
>> return info;
>> }
>> */
>> import "C"
>>
>> import (
>> "fmt"
>> "math"
>> "unsafe"
>> )
>>
>> func main() {
>> A := []float64{1, 2, 3, 2, -4, -9, 3, 6, -3} // col-major format
>> m := int(math.Sqrt(float64(len(A))))
>> I := func(i, j int) int { return j*m + i }
>> printmat(m, A, "A")
>> U := make([]float64, len(A))
>> S := make([]float64, len(A))
>> Vt := make([]float64, len(A))
>> info := C.lapack_svd(
>> (*C.double)(unsafe.Pointer(&U[0])),
>> (*C.double)(unsafe.Pointer(&S[0])),
>> (*C.double)(unsafe.Pointer(&Vt[0])),
>> (C.long)(m),
>> (*C.double)(unsafe.Pointer(&A[0])),
>> )
>> fmt.Printf("SVD: info = %d\n", info)
>> USVt := make([]float64, len(A))
>> for i := 0; i < m; i++ {
>> for j := 0; j < m; j++ {
>> for k := 0; k < m; k++ {
>> USVt[I(i, j)] += U[I(i, k)] * S[k] * Vt[I(k, j)]
>> }
>> }
>> }
>> printmat(m, USVt, "U*S*Vt")
>> }
>>
>> func printmat(m int, M []float64, msg string) {
>> fmt.Printf("%s =\n", msg)
>> for i := 0; i < m; i++ {
>> for j := 0; j < m; j++ {
>> fmt.Printf("%13.8f", M[j*m+i])
>> }
>> fmt.Println()
>> }
>> }
>>
>> Any help is much appreciated.
>>
>> Cheers.
>> Dorival
>>
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--
Dorival Pedroso PhD +61 0420411142 www.cpmech.com Brisbane Australia
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