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Require GCC 6.2 or later to build glibc.

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As discussed during development for glibc 2.29, when we increased the
required minimum GCC version for building glibc to GCC 5, working
purely based on the times at which such requirements have been
increased in the past it would be appropriate for glibc 2.30 to
require GCC 6 (matching GCC 4.9 having been required for glibc 2.26).
Naming 6.2 specifically as the minimum version then means a separate
version requirement no longer needs to be specified for powerpc64le.

Thus, this patch increases the minimum to 6.2, removing the
documentation of the separate requirement for powerpc64le.  It does
not remove the powerpc64le configure test, or any __GNUC_PREREQ that
could be removed as not being in installed headers or files shared
with gnulib; I think such cleanups are best done separately.

Tested for x86_64.

	* configure.ac (libc_cv_compiler_ok): Require GCC 6.2 or later.
	* configure: Regenerated.
	* manual/install.texi (Tools for Compilation): Update minimum GCC
	version.
	* INSTALL: Regenerated.
This commit is contained in:
Joseph Myers 2019-02-01 16:27:44 +00:00
parent 6175507c06
commit 4dcbbc3b28
6 changed files with 18 additions and 16 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2019-02-01 Joseph Myers <joseph@codesourcery.com>
* configure.ac (libc_cv_compiler_ok): Require GCC 6.2 or later.
* configure: Regenerated.
* manual/install.texi (Tools for Compilation): Update minimum GCC
version.
* INSTALL: Regenerated.
2019-02-01 Florian Weimer <fweimer@redhat.com>
* support/support_test_compare_string.c

9
INSTALL
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@ -459,19 +459,14 @@ build the GNU C Library:
As of relase time, GNU 'make' 4.2.1 is the newest verified to work
to build the GNU C Library.
* GCC 5 or newer
* GCC 6.2 or newer
GCC 5 or higher is required. In general it is recommended to use
GCC 6.2 or higher is required. In general it is recommended to use
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 8.2.1 is the newest compiler
verified to work to build the GNU C Library.
For PowerPC 64-bits little-endian (powerpc64le), GCC 6.2 or higher
is required. This compiler version is the first to provide the
features required for building the GNU C Library with support for
'_Float128'.
For multi-arch support it is recommended to use a GCC which has
been built with support for GNU indirect functions. This ensures
that correct debugging information is generated for functions

5
NEWS
View File

@ -17,7 +17,10 @@ Deprecated and removed features, and other changes affecting compatibility:
Changes to build and runtime requirements:
[Add changes to build and runtime requirements here]
* GCC 6.2 or later is required to build the GNU C Library.
Older GCC versions and non-GNU compilers are still supported when
compiling programs that use the GNU C Library.
Security related changes:

2
configure vendored
View File

@ -5119,7 +5119,7 @@ int
main ()
{
#if !defined __GNUC__ || __GNUC__ < 5
#if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
#error insufficient compiler
#endif
;

2
configure.ac
View File

@ -1017,7 +1017,7 @@ AC_CHECK_PROG_VER(BISON, bison, --version,
AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
AC_TRY_COMPILE([], [
#if !defined __GNUC__ || __GNUC__ < 5
#if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
#error insufficient compiler
#endif],
[libc_cv_compiler_ok=yes],

8
manual/install.texi
View File

@ -499,18 +499,14 @@ As of relase time, GNU @code{make} 4.2.1 is the newest verified to work
to build @theglibc{}.
@item
GCC 5 or newer
GCC 6.2 or newer
GCC 5 or higher is required. In general it is recommended to use
GCC 6.2 or higher is required. In general it is recommended to use
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 8.2.1 is the newest compiler verified to work to build
@theglibc{}.
For PowerPC 64-bits little-endian (powerpc64le), GCC 6.2 or higher is
required. This compiler version is the first to provide the features
required for building @theglibc{} with support for @code{_Float128}.
For multi-arch support it is recommended to use a GCC which has been built with
support for GNU indirect functions. This ensures that correct debugging
information is generated for functions selected by IFUNC resolvers. This