https://bugzilla.kernel.org/show_bug.cgi?id=60749 Bug ID: 60749 Summary: Do not need to link against -lm for fabs*() Product: Documentation Version: unspecified Hardware: All OS: Linux Status: NEW Severity: low Priority: P1 Component: man-pages Assignee: documentation_man-pages@xxxxxxxxxxxxxxxxxxxx Reporter: orion@xxxxxxxxxxxxx Regression: No >From the fabs(3) man page: SYNOPSIS #include <math.h> double fabs(double x); float fabsf(float x); long double fabsl(long double x); Link with -lm. At least on RHEL5+ one does not appear to need to link with -lm. # cat fabs.c #include <math.h> #include <stdlib.h> #include <stdio.h> int main(int argc, char **argv) { printf("%f\n",fabs(atof(argv[1]))); printf("%f\n",fabsf((float)atof(argv[1]))); printf("%Lf\n",fabsl((long double)atof(argv[1]))); return 0; } # gcc -g -Wall fabs.c # ./a.out -2.5 2.500000 2.500000 2.500000 # gcc -v Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --disable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --host=x86_64-redhat-linux Thread model: posix gcc version 4.1.2 20080704 (Red Hat 4.1.2-54) -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
