c++ - MinGW on Cygwin. Some issues on linking the GNU Scientific Library -


i have couple of issues when linking gnu scientific library mingw on cygwin. let me explain situation.

i have installed both mingw , gsl cygwin setup utility. path /usr/i686-w64-mingw32/sys-root/mingw/bin/ contains:

gsl-config           libgfortran-3.dll                 libssp-0.dll libatomic-1.dll      libgomp-1.dll                     libstdc++-6.dll libblas.dll          libgomp-plugin-host_nonshm-1.dll  libvtv_stubs-0.dll libcblas.dll         libgsl-19.dll                     libvtv-0.dll libgcc_s_sjlj-1.dll  libquadmath-0.dll                 libwinpthread-1.dll

the path /usr/i686-w64-mingw32/sys-root/mingw/include/contains gsl headers.

the path /usr/i686-w64-mingw32/sys-root/mingw/lib/contains, among many other libraries, files libgsl.dll.a , libgslcblas.dll.a

if compile using

i686-w64-mingw32-g++.exe -std=c++11 -s somegslapp.cpp -lgsl -static-libgcc -wl,-bstatic -lstdc++ -lpthread -lm

it compiles without problem, , executable can run provided /usr/i686-w64-mingw32/sys-root/mingw/bin/ added path environment variable.

let me point out first strange issue. if not set path variable, in order run program, have copy files in /usr/i686-w64-mingw32/sys-root/mingw/bin/ path executable located. careful, files, not gsl dlls. strange, because other libraries linked statically. indeed, have other programs not use gsl, , when compile them statically linking standard library in same way somegslapp above, can run without setting path, nor copying dlls.

the second issue happens when try statically link gsl. if try:

i686-w64-mingw32-g++.exe -std=c++11 -s somegslapp.cpp -static-libgcc -wl,-bstatic -lstdc++ -lpthread -lm -lgsl

the gnu linker returns error cannot find -lgsl. tried add

-i/usr/i686-w64-mingw32/sys-root/mingw/include/ -l/usr/i686-w64-mingw32/sys-root/mingw/lib/

but not change anything, still same error.

so, concerning first issue, explain why need copy dlls? tentative explanation gsl dll needs others, cannot understand why fortran dll needed.

concerning second issue, tell me how link gsl statically?

update on second issue

if link statically using

i686-w64-mingw32-g++.exe -std=c++11 -s somegslapp.cpp -static-libgcc -wl,-bstatic -lstdc++ -lpthread -lm -lgsl.dll

i not error cannot find -lgsl anymore, compilation , linking terminate without error or warning, executable still not run if not set path or copy dlls seen above. seems static linking not working gsl.

try adding -static. linking dll might not generate static dependency on library without according flag, if @ all. linking stdc++ not needed. (as -w,.. if -static used.


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