gfortran无法使用MinGW找到OpenMP库(omp_lib.mod) [英] gfortran can't find OpenMP library (omp_lib.mod) using MinGW

问题描述

我正在尝试编译包括OpenMP在内的Fortran代码.我从另一个代码复制了OpenMP的用法.它昨天成功构建了一次，然后下次构建时，出现以下错误:

I am trying to compile a Fortran code including OpenMP. I am replicating the use of OpenMP from a different code. It built successfully once yesterday and then the next time I built it I get the following error:

../MAXBRG3D.f90:3:4:

 USE OMP_LIB      ! USED WITH OMP FUNCTIONS
    1
 Fatal Error: Can't open module file 'omp_lib.mod' for reading at (1): No such file or directory
compilation terminated.
subdir.mk:329: recipe for target 'MAXBRG3D.o' failed
make: *** [MAXBRG3D.o] Error 1

我对代码所做的唯一更改是在其中注释掉与OpenMP功能无关的几部分代码.此后，我删除了评论，但仍收到相同的错误.我的编译命令如下.

The only changes I made to the code where to comment out a few sections of code unrelated to the OpenMP capabilities. I have since removed the comments but am still getting the same error. My compilation command is as follows.

gfortran -funderscoring -O0 -g -Wall -c -fmessage-length=0 -fopenmp -o "MAXBRG3D.o" "../MAXBRG3D.f90"

我看过以下链接: gfortran可以在MinGW下找不到OpenMP库(omp_lib.mod)当我运行 gfortran -v时，--enable-libgomp 确实显示.

I have seen the following link: gfortran can't find OpenMP library (omp_lib.mod) under MinGW and when I run gfortran -v, --enable-libgomp does show up.

>gfortran -v
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/6.3.0/lto-wrapper.exe
Target: mingw32
Configured with: ../src/gcc-6.3.0/configure --build=x86_64-pc-linux-gnu --host=mingw32 --with-gmp=/mingw --with-mpfr=/mingw --with-mpc=/mingw --with-isl=/mingw --prefix=/mingw --disable-win32-registry --target=mingw32 --with-arch=i586 --enable-languages=c,c++,objc,obj-c++,fortran,ada --with-pkgversion='MinGW.org GCC-6.3.0-1' --enable-static --enable-shared --enable-threads --with-dwarf2 --disable-sjlj-exceptions --enable-version-specific-runtime-libs --with-libiconv-prefix=/mingw --with-libintl-prefix=/mingw --enable-libstdcxx-debug --with-tune=generic --enable-libgomp --disable-libvtv --enable-nls
Thread model: win32
gcc version 6.3.0 (MinGW.org GCC-6.3.0-1)

我能够运行以下Fortran小代码.

I was able to run the following little Fortran code.

PROGRAM TEST
  INTEGER M
  REAL C(3), D(3)

  M=3
  C(1) = 2
  C(2) = 5
  C(3) = 10
  call A1(M,C,D)
  write(*,5)D(3)
  5 format(1x,'D3=',G12.5)
END PROGRAM

SUBROUTINE A1(N, A, B)
  INTEGER I, N
  REAL B(N), A(N)
!$OMP PARALLEL DO !I is private by default
  DO I=2,N
    B(I) = (A(I) + A(I-1)) / 2.0
  ENDDO
!$OMP END PARALLEL DO
END SUBROUTINE A1

我也有libgomp.a，libgomp.dll.a，libgomp.spec(位于MinGW \ lib \ gcc \ mingw32 \ 6.3.0中)和libgomp-1.dll(位于MinGW \ bin中).

Also I do have libgomp.a, libgomp.dll.a, libgomp.spec, (located in MinGW\lib\gcc\mingw32\6.3.0) and libgomp-1.dll (located in MinGW\bin).

推荐答案

我已经解决了这个问题.我注释掉 USE OMP_LIB 行，并刚刚初始化了要使用的功能.

I have solved this problem. I commented out the USE OMP_LIB line and I just initialized the functions that I wanted to use.

以前，我找到了一个将函数初始化为的示例

Previously I found an example which initialized the functions as

INTEGER FUNCTION OMP_GET_THREAD_NUM()

这不起作用.但是，我发现了另一个示例，该示例将函数初始化为整数.所以

This was not working. However I found a different example which initialized the functions just as integers. So

INTEGER OMP_GET_THREAD_NUM

这似乎已经解决了问题，现在代码正在编译并运行.

This seems to have solved the problem and now the code is compiling and running.

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