diff options
Diffstat (limited to 'INSTALL')
| -rw-r--r-- | INSTALL | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/INSTALL b/INSTALL index 64dec3473e..052b1b6f89 100644 --- a/INSTALL +++ b/INSTALL @@ -36,9 +36,18 @@ normal setting to install as the standard system library is '--prefix=/usr' for GNU/Linux systems and '--prefix=' (an empty prefix) for GNU/Hurd systems. - It may also be useful to set the CC and CFLAGS variables in the -environment when running 'configure'. CC selects the C compiler that -will be used, and CFLAGS sets optimization options for the compiler. + It may also be useful to pass 'CC=COMPILER' and 'CFLAGS=FLAGS' +arguments to 'configure'. 'CC' selects the C compiler that will be +used, and 'CFLAGS' sets optimization options for the compiler. Any +compiler options required for all compilations, such as options +selecting an ABI or a processor for which to generate code, should be +included in 'CC'. Options that may be overridden by the GNU C Library +build system for particular files, such as for optimization and +debugging, should go in 'CFLAGS'. The default value of 'CFLAGS' is '-g +-O2', and the GNU C Library cannot be compiled without optimization, so +if 'CFLAGS' is specified it must enable optimization. For example: + + $ ../glibc-VERSION/configure CC="gcc -m32" CFLAGS="-O3" The following list describes all of the available options for 'configure': @@ -210,7 +219,7 @@ will be used, and CFLAGS sets optimization options for the compiler. but you want to compile a library for 586es, give '--host=i586-pc-linux-gnu' or just '--host=i586-linux' and add the appropriate compiler flags ('-mcpu=i586' will do the trick) to - CFLAGS. + 'CC'. If you specify just '--build', 'configure' will get confused. @@ -304,7 +313,7 @@ makefiles. setting a few variables in 'configparms'. Set 'CC' to the cross-compiler for the target you configured the library for; it is important to use this same 'CC' value when running 'configure', like -this: 'CC=TARGET-gcc configure TARGET'. Set 'BUILD_CC' to the compiler +this: 'configure TARGET CC=TARGET-gcc'. Set 'BUILD_CC' to the compiler to use for programs run on the build system as part of compiling the library. You may need to set 'AR' to cross-compiling versions of 'ar' if the native tools are not configured to work with object files for the |