How do I work around the GCC "error: cast from ‘SourceLocation*’ to ‘int’ loses precision" error when compiling cmockery.c?
- by Daryl Spitzer
I need to add unit tests using Cmockery to an existing build environment that uses as hand-crafted Makefile. So I need to figure out how to build cmockery.c (without automake).
When I run:
g++ -DHAVE_CONFIG_H -DPIC -I ../cmockery-0.1.2 -I /usr/include/malloc -c ../cmockery-0.1.2/cmockery.c -o obj/cmockery.o
I get a long list of errors like this:
../cmockery-0.1.2/cmockery.c: In function ‘void initialize_source_location(SourceLocation*)’:
../cmockery-0.1.2/cmockery.c:248: error: cast from ‘SourceLocation*’ to ‘int’ loses precision
Here are lines 247:248 of cmockery.c:
static void initialize_source_location(SourceLocation * const location) {
assert_true(location);
assert_true is defined on line 154 of cmockery.h:
#define assert_true(c) _assert_true((int)(c), #c, __FILE__, __LINE__)
So the problem (as the error states) is GCC doesn't like the cast from ‘SourceLocation*’ to ‘int’.
I can build Cmockery using ./configure and make (on Linux, and on Mac OS X if I export CFLAGS=-I/usr/include/malloc first), without any errors. I've tried looking at the command-line that compiles cmockery.c when I run make (after ./configure):
gcc -DHAVE_CONFIG_H -I. -I. -I./src -I./src -Isrc/google -I/usr/include/malloc -MT libcmockery_la-cmockery.lo -MD -MP -MF .deps/libcmockery_la-cmockery.Tpo -c src/cmockery.c -fno-common -DPIC -o .libs/libcmockery_la-cmockery.o
...but I don't see any options that might work around this error.
In "error: cast from 'void*' to 'int' loses precision", I see I could change (int) in cmockery.h to (intptr_t). And I've confirmed that works. But since I can build Cmockery with ./configure and make, there must be a way to get it to build without modifying the source.
