Link math library with binfmtc

Question

I'm using binfmtc to allow me to run a C program without performing an explicit build step. This worked fine until I started using math functions, at which point I see messages such as:

undefined reference to `sin'

The header that I use is:

/*BINFMTC: -Wall -Werror -std=c99 -lm
*/

How can I get this program to link?

Closely related: "undefined reference to `pow'" even with math.h and the library link -lm

If you try to compile it with gcc, it compiles? is math lib reachable? — LPs, Feb 24 '16 at 16:47
@LPs: Yes. I can compile with gcc manually -- that lets me put '-lz' at the end of the full gcc command line, which `binfmtc` apparently does not. — Brent Bradburn, Feb 24 '16 at 17:00
Does `binfmtc` honor `CFLAGS`, `CXXFLAGS` and `LDFLAGS`?. If so, you can set `LDFLAGS="-lm -lz"` — alvits, Feb 24 '16 at 17:19
Note: This problem is unique to 'C' -- it doesn't happen in C++ mode: `BINFMTCXX`. — Brent Bradburn, Mar 02 '16 at 23:27

score 1 · Answer 1 · answered Feb 24 '16 at 17:12

1

This isn't elegant, but it works:

Create a wrapper script gcclm.sh for the library:

#! /usr/bin/env bash
gcc $@ -lm

Invoke the C program using the wrapper:

GCC=$(pwd)/gcclm.sh ./myprogram.c

answered Feb 24 '16 at 17:12

Brent Bradburn

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Link math library with binfmtc

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