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Require GCC 4.9 or later for building glibc
- From: Joseph Myers <joseph at codesourcery dot com>
- To: <libc-alpha at sourceware dot org>
- Date: Mon, 19 Jun 2017 15:27:38 +0000
- Subject: Require GCC 4.9 or later for building glibc
- Authentication-results: sourceware.org; auth=none
This patch makes configure require GCC 4.9 or later for building
glibc, and documents that requirement. Requiring GCC 4.9 or later
allows use of _Generic (as in tzcode). It would allow <stdatomic.h>
and _Atomic to be used as well if desired, although we need to avoid
any libatomic dependencies on any platforms. This patch is explicitly
the minimum to implement a new version requirement, with any
consequent cleanups of conditional code (not in installed headers or
files shared with gnulib etc.) to be done separately.
Tested for x86_64.
2017-06-19 Joseph Myers <joseph@codesourcery.com>
* configure.ac (libc_cv_compiler_ok): Require GCC 4.9 or later.
* configure: Regenerated.
* manual/install.texi (Tools for Compilation): Document
requirement for GCC 4.9 or later.
* INSTALL: Regenerated.
diff --git a/INSTALL b/INSTALL
index a2f5a40..71af35b 100644
--- a/INSTALL
+++ b/INSTALL
@@ -420,9 +420,9 @@ build the GNU C Library:
recommend GNU 'make' version 3.79. All earlier versions have
severe bugs or lack features.
- * GCC 4.7 or newer
+ * GCC 4.9 or newer
- GCC 4.7 or higher is required. In general it is recommended to use
+ GCC 4.9 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 6.3 is the newest compiler
diff --git a/NEWS b/NEWS
index 9ee2218..f81d02f 100644
--- a/NEWS
+++ b/NEWS
@@ -107,6 +107,10 @@ Version 2.26
PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND were added as those are supported
by the s390 kernel.
+* The minimum GCC version that can be used to build this version of the GNU
+ C Library is GCC 4.9. Older GCC versions, and non-GNU compilers, can
+ still be used to compile programs using the GNU C Library.
+
Security related changes:
* The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
diff --git a/configure b/configure
index 8390f2b..97a2dad 100755
--- a/configure
+++ b/configure
@@ -5058,7 +5058,7 @@ int
main ()
{
-#if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
+#if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
#error insufficient compiler
#endif
;
diff --git a/configure.ac b/configure.ac
index 4c0a18e..16e97d3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1105,7 +1105,7 @@ AC_CHECK_PROG_VER(AWK, gawk, --version,
AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
AC_TRY_COMPILE([], [
-#if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
+#if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
#error insufficient compiler
#endif],
[libc_cv_compiler_ok=yes],
diff --git a/manual/install.texi b/manual/install.texi
index cbc9128..65174a8 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -467,9 +467,9 @@ recommend GNU @code{make} version 3.79. All earlier versions have severe
bugs or lack features.
@item
-GCC 4.7 or newer
+GCC 4.9 or newer
-GCC 4.7 or higher is required. In general it is recommended to use
+GCC 4.9 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 6.3 is the newest compiler verified to work to build
--
Joseph S. Myers
joseph@codesourcery.com