Red Hat Bugzilla – Bug 81482
gcc won't compile system headers without warnings
Last modified: 2007-04-18 12:49:38 EDT
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2) Gecko/20021126 Description of problem: When I use the following gcc flags: gcc -g -pedantic-errors -Wall -O -pedantic -Wunused-parameter -Wunused-variable -Wuninitialized -W -Wshadow -Wpointer-arith -Wbad-function-cast -Wconversion -Wsign-compare -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wmissing-format-attribute -Wpadded -Wredundant-decls -Wunreachable-code -Winline -Wdisabled-optimization On code that includes math.h on redhat8, it gives the following error: In file included from /usr/include/math.h:362, from standard.h:107, from ambs.h:27, from amma.h:15, from amvpv.h:14, from amvpv.c:1: /usr/include/bits/mathinline.h: In function `fabsf': /usr/include/bits/mathinline.h:446: passing arg 1 of `__builtin_fabsf' as `float' rather than `double' due to prototype make[1]: *** [Linux_x86_glibc-2.2.93_gcc.debug/amvpv.o] Error 1 Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: See above Additional info:
*** Bug 81483 has been marked as a duplicate of this bug. ***
Either remove -Wconversion, or get rid of -pedantic-errors, you cannot have both. <math.h> has to declare functions required by the standard to use float arguments. -Wconversion is there to help playing together with code without prototypes, but you really cannot use any of the *f or *l functions in them anyway.