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make
cc -c vec3.c -Wall -Werror -pedantic-errors -std=c99 -o vec3.o
cc -c mat3.c -Wall -Werror -pedantic-errors -std=c99 -o mat3.o
cc -c mat4.c -Wall -Werror -pedantic-errors -std=c99 -o mat4.o
cc -c quat.c -Wall -Werror -pedantic-errors -std=c99 -o quat.o
quat.c:32:25: error: using integer absolute value function 'abs' when argument is of floating point type [-Werror,-Wabsolute-value]
        quat[3] = -sqrt(abs(1.0 - x * x - y * y - z * z));
                        ^
quat.c:32:25: note: use function 'fabs' instead
        quat[3] = -sqrt(abs(1.0 - x * x - y * y - z * z));
                        ^~~
                        fabs
quat.c:38:21: error: using integer absolute value function 'abs' when argument is of floating point type [-Werror,-Wabsolute-value]
    dest[3] = -sqrt(abs(1.0 - x * x - y * y - z * z));
                    ^
quat.c:38:21: note: use function 'fabs' instead
    dest[3] = -sqrt(abs(1.0 - x * x - y * y - z * z));
                    ^~~
                    fabs
quat.c:220:9: error: using integer absolute value function 'abs' when argument is of floating point type [-Werror,-Wabsolute-value]
    if (abs(cosHalfTheta) >= 1.0) {
        ^
quat.c:220:9: note: use function 'fabs' instead
    if (abs(cosHalfTheta) >= 1.0) {
        ^~~
        fabs
quat.c:233:9: error: using integer absolute value function 'abs' when argument is of floating point type [-Werror,-Wabsolute-value]
    if (abs(sinHalfTheta) < 0.001) {
        ^
quat.c:233:9: note: use function 'fabs' instead
    if (abs(sinHalfTheta) < 0.001) {
        ^~~
        fabs
4 errors generated.
make: *** [quat] Error 1

cc -v
Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin15.0.0
Thread model: posix