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Full Discussion: Trigonometry missing?
Top Forums Programming Trigonometry missing? Post 302540679 by pflynn on Thursday 21st of July 2011 10:29:43 AM
Old 07-21-2011
Not sure of what you mean, but most of the questions related to the use of the GNU Libc mathematical funcions have to do with linking time problems. To compile and link programs that use the functions from the mathematical library, you need to explicitly tell gcc (or g++) to link your program agaist the library:

Code:
gcc -o mathdemo mathdemo.c -lm

 

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HARDENED-CC(1)							 Debian GNU/Linux						    HARDENED-CC(1)

NAME
hardened-cc - gcc wrapper to enforce hardening toolchain improvements SYNOPSIS
export DEB_BUILD_HARDENING=1 gcc ... DESCRIPTION
The hardened-cc wrapper is normally used by calling gcc as usual when DEB_BUILD_HARDENING is set to 1. It will configure the necessary toolchain hardening features. By default, all features are enabled. If a given feature does not work correctly and needs to be disabled, the corresponding environment variables mentioned below can be set to 0. ENVIRONMENT
DEB_BUILD_HARDENING=1 Enable hardening features. DEB_BUILD_HARDENING_DEBUG=1 Print the full resulting gcc command line to STDERR before calling gcc. DEB_BUILD_HARDENING_STACKPROTECTOR=0 Disable stack overflow protection. See README.Debian for details. DEB_BUILD_HARDENING_RELRO=0 Disable read-only linker sections. See README.Debian for details. DEB_BUILD_HARDENING_FORTIFY=0 Don't fortify several standard functions. See README.Debian for details. DEB_BUILD_HARDENING_PIE=0 Don't build position independent executables. See README.Debian for details. DEB_BUILD_HARDENING_FORMAT=0 Disable unsafe format string usage errors. See README.Debian for details. NOTES
System-wide settings can be added to /etc/hardening-wrapper.conf, one per line. The real gcc symlinks are renamed gcc.real, and a diversion is registered with dpkg-divert(1). Thus hardened-cc's idea of the default gcc is dictated by whatever package installed /usr/bin/gcc. SEE ALSO
hardened-ld(1) gcc(1) Debian Project 2008-01-08 HARDENED-CC(1)
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