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Require GCC 4.6 or later to build glibc.

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As discussed in the thread starting at
<https://sourceware.org/ml/libc-alpha/2014-10/msg00792.html>, and
continuing into November, this patch increases the minimum GCC version
for building glibc to 4.6 (there seemed to be no clear consensus for
4.7).  In particular, this allows us to use #pragma GCC diagnostic for
fine-grained warning control with -Werror (subject to establishing a
suitable policy for that use).  The documentation has a statement, as
requested, about the most recent GCC version tested for building
glibc, and I've updated <https://sourceware.org/glibc/wiki/Release> to
refer to updating that statement.  A NEWS entry is added for this
change, although previous such changes didn't get them.

Tested for x86_64 (testsuite, and that installed shared libraries are
unchanged by this patch).

	* configure.ac (libc_cv_compiler_ok): Require GCC 4.6 or later.
	* configure: Regenerated.
	* manual/install.texi (Tools for Compilation): Document a
	requirement of GCC 4.6 or later and that GCC 4.9 is the newest
	compiler verified to work.
	* INSTALL: Regenerated.
This commit is contained in:
Joseph Myers 2014-11-14 18:00:34 +00:00
parent c1b0aadcdf
commit 4863355ad5
6 changed files with 25 additions and 8 deletions
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7
ChangeLog
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@ -1,5 +1,12 @@
2014-11-14 Joseph Myers <joseph@codesourcery.com> 2014-11-14 Joseph Myers <joseph@codesourcery.com>
* configure.ac (libc_cv_compiler_ok): Require GCC 4.6 or later.
* configure: Regenerated.
* manual/install.texi (Tools for Compilation): Document a
requirement of GCC 4.6 or later and that GCC 4.9 is the newest
compiler verified to work.
* INSTALL: Regenerated.
* include/string.h [NO_MEMPCPY_STPCPY_REDIRECT] (mempcpy): Do not * include/string.h [NO_MEMPCPY_STPCPY_REDIRECT] (mempcpy): Do not
redeclare with asm name. redeclare with asm name.
[NO_MEMPCPY_STPCPY_REDIRECT] (stpcpy): Likewise. [NO_MEMPCPY_STPCPY_REDIRECT] (stpcpy): Likewise.

9
INSTALL
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@ -329,10 +329,13 @@ build the GNU C Library:
recommend GNU `make' version 3.79. All earlier versions have recommend GNU `make' version 3.79. All earlier versions have
severe bugs or lack features. severe bugs or lack features.
* GCC 4.4 or newer, GCC 4.6 recommended * GCC 4.6 or newer
GCC 4.4 or higher is required; as of this writing, GCC 4.6 is the GCC 4.6 or higher is required. In general it is recommended to use
compiler we advise to use to build the GNU C Library. the newest version of the compiler that is known to work for
building the GNU C Library, as newer compilers usually produce
better code. As of release time, GCC 4.9 is the newest compiler
verified to work to build the GNU C Library.
You can use whatever compiler you like to compile programs that use You can use whatever compiler you like to compile programs that use
the GNU C Library. the GNU C Library.

4
NEWS
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@ -14,6 +14,10 @@ Version 2.21
17555, 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17555, 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585,
17589, 17594. 17589, 17594.
* The minimum GCC version that can be used to build this version of the GNU
C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
still be used to compile programs using the GNU C Library.
* New locales: tu_IN, bh_IN. * New locales: tu_IN, bh_IN.
Version 2.20 Version 2.20

2
configure vendored
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@ -4929,7 +4929,7 @@ int
main () main ()
{ {
#if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4) #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
#error insufficient compiler #error insufficient compiler
#endif #endif
; ;

2
configure.ac
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@ -934,7 +934,7 @@ AC_CHECK_PROG_VER(AWK, gawk, --version,
AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [ AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
AC_TRY_COMPILE([], [ AC_TRY_COMPILE([], [
#if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4) #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
#error insufficient compiler #error insufficient compiler
#endif], #endif],
[libc_cv_compiler_ok=yes], [libc_cv_compiler_ok=yes],

9
manual/install.texi
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@ -372,10 +372,13 @@ recommend GNU @code{make} version 3.79. All earlier versions have severe
bugs or lack features. bugs or lack features.
@item @item
GCC 4.4 or newer, GCC 4.6 recommended GCC 4.6 or newer
GCC 4.4 or higher is required; as of this writing, GCC 4.6 is the GCC 4.6 or higher is required. In general it is recommended to use
compiler we advise to use to build @theglibc{}. the newest version of the compiler that is known to work for building
@theglibc{}, as newer compilers usually produce better code. As of
release time, GCC 4.9 is the newest compiler verified to work to build
@theglibc{}.
You can use whatever compiler you like to compile programs that use You can use whatever compiler you like to compile programs that use
@theglibc{}. @theglibc{}.