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Use -Werror by default, add --disable-werror.
As discussed starting at <https://sourceware.org/ml/libc-alpha/2014-11/msg00323.html>, this patch makes the glibc build use -Werror by default to avoid accidentally adding new warnings to the build. The configure option --disable-werror can be used to disable this. -Wno-error=undef is temporarily used because the build isn't clean regarding -Wundef warnings. The idea is that once the remaining -Wundef warnings have been cleaned up (in at least one configuration), -Wno-error=undef will be removed. I get a clean build and test on x86_64 (GCC 4.9 branch) with this patch. The expectation is that this may well break the build for some other configurations, and people seeing such breakage should make appropriate fixes to fix or suppress the warnings for their configurations. In some cases that may involve using pragmas as the right fix (I think that will be right for the -Wno-inline issue for MIPS I referred to in <https://sourceware.org/ml/libc-alpha/2012-11/msg00798.html>, for example), in some cases -Wno-error in sysdeps makefiles (__restore_rt in MIPS sigaction, for example), in some cases substantive fixes for the warnings. Note that if, with a view to listing all the warnings then fixing them all, you just look for "warning:" in output from building and testing with --disable-werror, you'll see lots of warnings from the linker about functions such as tmpnam. Those warnings can be ignored - only compiler warnings are relevant to -Werror, not linker warnings. * configure.ac (--disable-werror): New configure option. (enable_werror): New AC_SUBST. * configure: Regenerated. * config.make.in (enable-werror): New variable. * Makeconfig [$(enable-werror) = yes] (+gccwarn): Add -Werror -Wno-error=undef. (+gccwarn-c): Do not use -Werror=implicit-function-declaration. * manual/install.texi (Configuring and compiling): Document --disable-werror. * INSTALL: Regenerated. * debug/Makefile (CFLAGS-tst-chk1.c): Add -Wno-error. (CFLAGS-tst-chk2.c): Likewise. (CFLAGS-tst-chk3.c): Likewise. (CFLAGS-tst-chk4.cc): Likewise. (CFLAGS-tst-chk5.cc): Likewise. (CFLAGS-tst-chk6.cc): Likewise. (CFLAGS-tst-lfschk1.c): Likewise. (CFLAGS-tst-lfschk2.c): Likewise. (CFLAGS-tst-lfschk3.c): Likewise. (CFLAGS-tst-lfschk4.cc): Likewise. (CFLAGS-tst-lfschk5.cc): Likewise. (CFLAGS-tst-lfschk6.cc): Likewise.
This commit is contained in:
Joseph Myers
parent
0f88636c09
commit
a4ecc9eb9b
23
ChangeLog
23
ChangeLog
@ -1,5 +1,28 @@
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2014-12-10 Joseph Myers <joseph@codesourcery.com>
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* configure.ac (--disable-werror): New configure option.
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(enable_werror): New AC_SUBST.
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* configure: Regenerated.
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* config.make.in (enable-werror): New variable.
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* Makeconfig [$(enable-werror) = yes] (+gccwarn): Add -Werror
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-Wno-error=undef.
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(+gccwarn-c): Do not use -Werror=implicit-function-declaration.
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* manual/install.texi (Configuring and compiling): Document
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--disable-werror.
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* INSTALL: Regenerated.
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* debug/Makefile (CFLAGS-tst-chk1.c): Add -Wno-error.
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(CFLAGS-tst-chk2.c): Likewise.
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(CFLAGS-tst-chk3.c): Likewise.
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(CFLAGS-tst-chk4.cc): Likewise.
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(CFLAGS-tst-chk5.cc): Likewise.
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(CFLAGS-tst-chk6.cc): Likewise.
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(CFLAGS-tst-lfschk1.c): Likewise.
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(CFLAGS-tst-lfschk2.c): Likewise.
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(CFLAGS-tst-lfschk3.c): Likewise.
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(CFLAGS-tst-lfschk4.cc): Likewise.
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(CFLAGS-tst-lfschk5.cc): Likewise.
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(CFLAGS-tst-lfschk6.cc): Likewise.
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* stdio-common/tst-printfsz.c: Include <libc-internal.h>.
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(main): Disable -Wdeprecated-declarations around calls to
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register_printf_function.
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7
INSTALL
7
INSTALL
@ -143,6 +143,13 @@ will be used, and CFLAGS sets optimization options for the compiler.
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additional security risks to the system and you should enable it
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only if you understand and accept those risks.
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`--disable-werror'
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By default, the GNU C Library is built with `-Werror'. If you wish
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to build without this option (for example, if building with a newer
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version of GCC than this version of the GNU C Library was tested
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with, so new warnings cause the build with `-Werror' to fail), you
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can configure with `--disable-werror'.
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`--build=BUILD-SYSTEM'
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`--host=HOST-SYSTEM'
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These options are for cross-compiling. If you specify both
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@ -717,7 +717,10 @@ else
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+gccwarn := -Wall -Wwrite-strings -Winline
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endif
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+gccwarn += -Wundef
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+gccwarn-c = -Wstrict-prototypes -Werror=implicit-function-declaration
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ifeq ($(enable-werror),yes)
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+gccwarn += -Werror -Wno-error=undef
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endif
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+gccwarn-c = -Wstrict-prototypes
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# We do not depend on the address of constants in different files to be
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# actually different, so allow the compiler to merge them all.
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3
NEWS
3
NEWS
@ -26,6 +26,9 @@ Version 2.21
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C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
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still be used to compile programs using the GNU C Library.
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* The GNU C Library is now built with -Werror by default. This can be
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disabled by configuring with --disable-werror.
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* New locales: tu_IN, bh_IN, raj_IN, ce_RU.
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* The obsolete sigvec function has been removed. This was the original
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@ -45,6 +45,7 @@ sysheaders = @sysheaders@
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sysincludes = @SYSINCLUDES@
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c++-sysincludes = @CXX_SYSINCLUDES@
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all-warnings = @all_warnings@
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enable-werror = @enable_werror@
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have-z-combreloc = @libc_cv_z_combreloc@
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have-z-execstack = @libc_cv_z_execstack@
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12
configure
vendored
12
configure
vendored
@ -668,6 +668,7 @@ build_pt_chown
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build_nscd
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link_obsolete_rpc
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libc_cv_nss_crypt
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enable_werror
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all_warnings
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force_install
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bindnow
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@ -767,6 +768,7 @@ enable_force_install
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enable_maintainer_mode
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enable_kernel
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enable_all_warnings
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enable_werror
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enable_multi_arch
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enable_nss_crypt
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enable_obsolete_rpc
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@ -1428,6 +1430,7 @@ Optional Features:
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--enable-kernel=VERSION compile for compatibility with kernel not older than
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VERSION
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--enable-all-warnings enable all useful warnings gcc can issue
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--disable-werror do not build with -Werror
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--enable-multi-arch enable single DSO with optimizations for multiple
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architectures
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--enable-nss-crypt enable libcrypt to use nss
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@ -3565,6 +3568,15 @@ fi
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# Check whether --enable-werror was given.
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if test "${enable_werror+set}" = set; then :
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enableval=$enable_werror; enable_werror=$enableval
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else
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enable_werror=yes
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fi
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# Check whether --enable-multi-arch was given.
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if test "${enable_multi_arch+set}" = set; then :
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enableval=$enable_multi_arch; multi_arch=$enableval
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@ -253,6 +253,13 @@ AC_ARG_ENABLE([all-warnings],
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[])
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AC_SUBST(all_warnings)
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AC_ARG_ENABLE([werror],
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AC_HELP_STRING([--disable-werror],
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[do not build with -Werror]),
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[enable_werror=$enableval],
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[enable_werror=yes])
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AC_SUBST(enable_werror)
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AC_ARG_ENABLE([multi-arch],
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AC_HELP_STRING([--enable-multi-arch],
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[enable single DSO with optimizations for multiple architectures]),
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@ -96,19 +96,21 @@ CFLAGS-tst-longjmp_chk3.c = -fexceptions -fasynchronous-unwind-tables
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CPPFLAGS-tst-longjmp_chk3.c = -D_FORTIFY_SOURCE=1
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# We know these tests have problems with format strings, this is what
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# we are testing. Disable that warning.
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CFLAGS-tst-chk1.c = -Wno-format
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CFLAGS-tst-chk2.c = -Wno-format
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CFLAGS-tst-chk3.c = -Wno-format
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CFLAGS-tst-chk4.cc = -Wno-format
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CFLAGS-tst-chk5.cc = -Wno-format
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CFLAGS-tst-chk6.cc = -Wno-format
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CFLAGS-tst-lfschk1.c = -Wno-format
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CFLAGS-tst-lfschk2.c = -Wno-format
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CFLAGS-tst-lfschk3.c = -Wno-format
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CFLAGS-tst-lfschk4.cc = -Wno-format
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CFLAGS-tst-lfschk5.cc = -Wno-format
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CFLAGS-tst-lfschk6.cc = -Wno-format
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# we are testing. Disable that warning. They also generate warnings
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# from warning attributes, which cannot be disabled via pragmas, so
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# require -Wno-error to be used.
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CFLAGS-tst-chk1.c = -Wno-format -Wno-error
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CFLAGS-tst-chk2.c = -Wno-format -Wno-error
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CFLAGS-tst-chk3.c = -Wno-format -Wno-error
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CFLAGS-tst-chk4.cc = -Wno-format -Wno-error
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CFLAGS-tst-chk5.cc = -Wno-format -Wno-error
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CFLAGS-tst-chk6.cc = -Wno-format -Wno-error
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CFLAGS-tst-lfschk1.c = -Wno-format -Wno-error
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CFLAGS-tst-lfschk2.c = -Wno-format -Wno-error
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CFLAGS-tst-lfschk3.c = -Wno-format -Wno-error
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CFLAGS-tst-lfschk4.cc = -Wno-format -Wno-error
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CFLAGS-tst-lfschk5.cc = -Wno-format -Wno-error
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CFLAGS-tst-lfschk6.cc = -Wno-format -Wno-error
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LDLIBS-tst-chk4 = -lstdc++
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LDLIBS-tst-chk5 = -lstdc++
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LDLIBS-tst-chk6 = -lstdc++
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@ -174,6 +174,13 @@ setuid and owned by @code{root}. The use of @file{pt_chown} introduces
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additional security risks to the system and you should enable it only if
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you understand and accept those risks.
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@item --disable-werror
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By default, @theglibc{} is built with @option{-Werror}. If you wish
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to build without this option (for example, if building with a newer
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version of GCC than this version of @theglibc{} was tested with, so
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new warnings cause the build with @option{-Werror} to fail), you can
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configure with @option{--disable-werror}.
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@item --build=@var{build-system}
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@itemx --host=@var{host-system}
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These options are for cross-compiling. If you specify both options and
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