The program can t start because cygwin1 dll is missing in Eclipse CDT

Question

I ve had Eclipse for Java on my computer for a few years  and decided to install the CDT and learn C  I installed both MinGW and Cygwin and the CDT detects and tries to use them when I make a new project    I choose File  gt  New C   Project and choose Hello World C   Project and the CygwinGCC toolchain  I name the project  asdf  and hit  Build Debug  in the toolbar  The compiler completes without error  I hit Run and nothing happens    Browsing to the project directory manually and running asdf exe gives me an error saying   The program can t start because cygwin1 dll is missing from your computer  Try reinstalling the program to fix this problem      The same thing happens using MinGW  only a different dll is missing  What do I need to do to have a usable  exe   I m running Windows 7 x64 and the newest version of Eclipse and the CDT    EDIT  The compiler output is as follows        Build of configuration Debug for project asdf       make all  Building file     src asdf cpp Invoking  Cygwin C   Compiler g   -O0 -g3 -Wall -c -fmessage-length 0 -MMD -MP -MF src asdf d  -MT src asdf d  -o src asdf o      src asdf cpp  cygwin warning    MS-DOS style path detected  C  Users Shawn Dropbox eclipse asdf Debug   Preferred POSIX equivalent is   cygdrive c Users Shawn Dropbox eclipse asdf Debug   CYGWIN environment variable option  nodosfilewarning  turns off this warning    Consult the user s guide for more details about POSIX paths      http   cygwin com cygwin-ug-net using html using-pathnames Finished building     src asdf cpp  Building target  asdf exe Invoking  Cygwin C   Linker g    -o asdf exe     src asdf o    Finished building target  asdf exe

User · Accepted Answer

This error message means that Windows isn't able to find "cygwin1.dll". The Programs that the Cygwin gcc create depend on this DLL. The file is part of cygwin , so most likely it's located in C:\cygwin\bin. To fix the problem all you have to do is add C:\cygwin\bin (or the location where cygwin1.dll can be found) to your system path. Alternatively you can copy cygwin1.dll into your Windows directory.

There is a nice tool called DependencyWalker that you can download from http://www.dependencywalker.com . You can use it to check dependencies of executables, so if you inspect your generated program it tells you which dependencies are missing and which are resolved.

User · Answer

You can compile with either Cygwin s g   or MinGW  via stand-alone or using Cygwin package   However  in order to run it  you need to add the Cygwin1 dll  and others  PATH to the system Windows PATH  before any cygwin style paths    Thus add   C  cygwin64 bin to the end of your Windows system PATH variable   Also  to compile for use in CMD or PowerShell  you may need to use    x86 64-w64-mingw32-g   exe -static -std c  11 prog name cc -o prog name exe    This invokes the cross-compiler  if installed

[eclipse] The program can't start because cygwin1.dll is missing... in Eclipse CDT

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