与clang和gfortran编译 [英] Compiling with clang and gfortran

问题描述

我正在尝试编译一个最近开始工作的项目，并被要求在clang而不是gcc中编译代码。这个项目有一个CMake文件，我尝试使用

  cmake -DCMAKE_C_COMPILER = clang -DCMAKE_CXX_COMPILER = clang ++ ../src 
  

然而抛出一个错误，我相信是因为clang没有Fortran编译器和该项目的一部分具有Fortran代码。有没有办法让它在编译Fortran代码时使用gfortran（以前使用gcc时使用），其余部分是使用gngrran（clang / clang ++）？

cmake文件，我认为是相关的：

  enable_language（Fortran）
 
字符串（REGEX MATCH gfortran HAVE_GFORTRAN $ {CMAKE_Fortran_COMPILER}）
字符串（REGEX MATCH xlf HAVE_XLF $ {CMAKE_Fortran_COMPILER}）
字符串（REGEX MATCH pg77 HAVE_PG77 $ {CMAKE_Fortran_COMPILER}）
字符串（REGEX MATCH g77 HAVE_G77 $ {CMAKE_Fortran_COMPILER} ）
字符串（REGEX MATCH ifort HAVE_IFORT $ {CMAKE_Fortran_COMPILER}）
字符串（REGEX MATCH f77 HAVE_F77 $ {CMAKE_Fortran_COMPILER}）
 
如果（HAVE_GFORTRAN）
 set（F_LIBRARY gfortran CACHE字符串fortran库）
 find_library（F_LIBRARY NAMES gfortran）
 set（FORTRAN_UNDERSCORE结束CACHE字符串fortran下划线样式的类型 -  linux，end，none）
 set（DEF_FORTRAN_UNDERSCORE #define FORTRAN_UNDERSCORE_END）
 elseif（HAVE_X LF）
 set（F_LIBRARY xlf90 CACHE字符串fortran库）
 find_library（F_LIBRARY NAMES xlf90）
 set（FORTRAN_UNDERSCORE none CACHE字符串）什么类型的fortran下划线样式--linux，end，none ）
 set（DEF_FORTRAN_UNDERSCORE#define FORTRAN_UNDERSCORE_NONE）
 elseif（HAVE_PGF77）
 set（F_LIBRARY pgftnrtl CACHE字符串fortran库）
 find_library（F_LIBRARY NAMES pgftnrtl）
 set（FORTRAN_UNDERSCORE结束CACHE字符串fortran下划线样式的类型 -  linux，end，none）
 set（DEF_FORTRAN_UNDERSCORE#define FORTRAN_UNDERSCORE_END）
 elseif（HAVE_G77）
 set F_LIBRARY g2c CACHE字符串fortran库）
 find_library（F_LIBRARY NAME g2c）
 set（FORTRAN_UNDERSCORE linux CACHE字符串什么类型的fortran下划线样式--linux，end，none）
 set（ DEF_FORTRAN_UNDERSCORE#define FORTRAN_UNDERSCORE_LINUX）
 elseif（HAVE_ifort）
 set（F_LIBRARY ifcore CACHE字符串fortran库）
 find_library（F_LIBRARY NAM ES ifcore）
 set（FORTRAN_UNDERSCORE结束CACHE字符串什么类型的fortran下划线样式--linux，end，none）
 set（DEF_FORTRAN_UNDERSCORE#define FORTRAN_UNDERSCORE_END）
 elseif（HAVE_F77）
 set（FORTRAN_UNDERSCORE结束CACHE字符串什么类型的fortran下划线样式 -  linux，end，none）
 set（FORTRAN_LIBRARYCACHE stringfortran库）
 set（DEF_FORTRAN_UNDERSCORE#define FORTRAN_UNDERSCORE_END）
 endif（）
 
＃f77在redstorm上当前是一个例外 - 不需要它
 if（NOT F_LIBRARY AND NOT HAVE_F77）
 message（FATAL_ERROR 无法找到Fortran库）
 endif（不是F_LIBRARY AND NOT HAVE_F77）
  

终端输出说：当我尝试cmake时，这是一个错误：

  message（FATAL_ERROR找不到fortran库）
  

请让我知道是否需要发布更多信息。非常感谢！

解决方案

为了不让问题开放：

如果cmake不是cmake，那么必须将变量 CMAKE_Fortran_COMPILER 设置为编译器可执行文件的名称（ gfortran ）能够自动确定它。

I'm trying to compile a project I recently started working on, and was asked to compile the code in clang instead of gcc. There is a CMake file for the project, and I tried to cmake the project using

cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ ../src

However an error is thrown, which I believe is because clang doesn't have a Fortran compiler and part of the project has Fortran code. Is there a way to make it use gfortran (previously used when gcc is used) when compiling the Fortran code, and clang/clang++ for the rest?

The part of the cmake file which I think is relevant is:

enable_language(Fortran)

string(REGEX MATCH gfortran HAVE_GFORTRAN ${CMAKE_Fortran_COMPILER})
string(REGEX MATCH xlf HAVE_XLF ${CMAKE_Fortran_COMPILER})
string(REGEX MATCH pg77 HAVE_PG77 ${CMAKE_Fortran_COMPILER})
string(REGEX MATCH g77 HAVE_G77 ${CMAKE_Fortran_COMPILER})
string(REGEX MATCH ifort HAVE_ifORT ${CMAKE_Fortran_COMPILER})
string(REGEX MATCH f77 HAVE_F77 ${CMAKE_Fortran_COMPILER})

if(HAVE_GFORTRAN)
  set(F_LIBRARY gfortran CACHE string "fortran library")
  find_library(F_LIBRARY NAMES gfortran)
  set(FORTRAN_UNDERSCORE end CACHE string "What type of fortran underscore style - linux,end,none")
  set(DEF_FORTRAN_UNDERSCORE "#define FORTRAN_UNDERSCORE_END")
elseif(HAVE_XLF)
  set(F_LIBRARY xlf90 CACHE string "fortran library")
  find_library(F_LIBRARY NAMES xlf90)
  set(FORTRAN_UNDERSCORE none CACHE string "What type of fortran underscore style - linux,end,none")
  set(DEF_FORTRAN_UNDERSCORE "#define FORTRAN_UNDERSCORE_NONE")
elseif(HAVE_PGF77)
  set(F_LIBRARY pgftnrtl CACHE string "fortran library")
  find_library(F_LIBRARY NAMES pgftnrtl)
  set(FORTRAN_UNDERSCORE end CACHE string "What type of fortran underscore style - linux,end,none")
  set(DEF_FORTRAN_UNDERSCORE "#define FORTRAN_UNDERSCORE_END")
elseif(HAVE_G77)
  set(F_LIBRARY g2c CACHE string "fortran library")
  find_library(F_LIBRARY NAMES g2c)
  set(FORTRAN_UNDERSCORE linux CACHE string "What type of fortran underscore style - linux,end,none")
  set(DEF_FORTRAN_UNDERSCORE "#define FORTRAN_UNDERSCORE_LINUX")
elseif(HAVE_ifort)
  set(F_LIBRARY ifcore CACHE string "fortran library")
  find_library(F_LIBRARY NAMES ifcore)
  set(FORTRAN_UNDERSCORE end CACHE string "What type of fortran underscore style - linux,end,none")
  set(DEF_FORTRAN_UNDERSCORE "#define FORTRAN_UNDERSCORE_END")
elseif(HAVE_F77)
  set(FORTRAN_UNDERSCORE end CACHE string "What type of fortran underscore style - linux,end,none")
  set(FORTRAN_LIBRARY "" CACHE string "fortran library")
  set(DEF_FORTRAN_UNDERSCORE "#define FORTRAN_UNDERSCORE_END")
endif()

# f77 on redstorm currently an exception - doesn't need it 
if(NOT F_LIBRARY AND NOT HAVE_F77)
  message(FATAL_ERROR "Cannot find fortran library")
endif(NOT F_LIBRARY AND NOT HAVE_F77)

Terminal output says that this is threw an error when I tried cmake:

message(FATAL_ERROR "Cannot find fortran library")

Please let me know if I need to post any more info. Many thanks in advance!

解决方案

In order not to leave the question open:

The variable CMAKE_Fortran_COMPILER must be set to the name of the compiler executable (gfortran) if cmake is not able to determine it automatically.

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