mlton gives library-related error

Question

When I try to compile a program with mlton, I get an error.

~/projects/serve-sml $ mlton server.mlb
In file included from /usr/lib/mlton/include/platform.h:13:0,
                 from /usr/lib/mlton/include/common-main.h:16,
                 from /usr/lib/mlton/include/amd64-main.h:11,
                 from /tmp/file86PWQJ.1.c:110:
/usr/lib/mlton/include/cenv.h:137:17: fatal error: gmp.h: No such file or directory
 #include "gmp.h"
                 ^
compilation terminated.
call to system failed with exit status 1:
gcc -std=gnu99 -c -I/usr/lib/mlton/targets/self/include -I/usr/lib/mlton/include -O1 -fno-common -fno-strict-aliasing -fomit-frame-pointer -w -m64 -o /tmp/fileg5D5To.o /tmp/file86PWQJ.1.c
~/projects/serve-sml $ 

According to this, that means I should install libgmp3-dev. I've run apt-get install libgmp3-dev, and verified that the file /usr/include/x86_64-linux-gnu/gmp.h exists, but am still getting the same error.

Any idea what I'm doing wrong?

Answer 1

Try executing gcc -v -x c -E - in your terminal. This will print out the header file search path that your C compiler is using. I get something like:

#include "..." search starts here:
#include <...> search starts here:
/Users/ml9951/include
.
/usr/local/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.1.0/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
/usr/include
/System/Library/Frameworks (framework directory)
/Library/Frameworks (framework directory)

So if I had gmp.h in /usr/include/x86_64-linux-gnu/, then my C compiler would not find it. I would suggest moving your .h file into a directory that is on this search path (like /usr/local/include in my case), or passing in the -I /usr/include/x86_64-linux-gnu/ flag, which would require modifying MLton's build scripts. Chances are you are going to have to do the same thing with libgmp.a when it comes time to link