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commit 9ba202c78f0aa39f49929eee63c367847da72ee4
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93dc2d |
Author: Florian Weimer <fweimer@redhat.com>
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93dc2d |
Date: Fri Jan 14 20:16:05 2022 +0100
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93dc2d |
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93dc2d |
Add --with-rtld-early-cflags configure option
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93dc2d |
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93dc2d |
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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93dc2d |
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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93dc2d |
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93dc2d |
Conflicts:
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93dc2d |
INSTALL
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93dc2d |
configure
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93dc2d |
manual/install.texi
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93dc2d |
(Missing --with-timeout-factor downstream.)
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93dc2d |
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diff --git a/INSTALL b/INSTALL
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index d6d93ec9be4262d7..d8d4e9f155f56616 100644
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93dc2d |
--- a/INSTALL
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93dc2d |
+++ b/INSTALL
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93dc2d |
@@ -106,6 +106,14 @@ if 'CFLAGS' is specified it must enable optimization. For example:
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93dc2d |
particular case and potentially change debugging information and
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93dc2d |
metadata only).
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93dc2d |
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93dc2d |
+'--with-rtld-early-cflags=CFLAGS'
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93dc2d |
+ Use additional compiler flags CFLAGS to build the early startup
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+ code of the dynamic linker. These flags can be used to enable
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+ early dynamic linker diagnostics to run on CPUs which are not
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+ compatible with the rest of the GNU C Library, for example, due to
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93dc2d |
+ compiler flags which target a later instruction set architecture
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93dc2d |
+ (ISA).
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93dc2d |
+
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93dc2d |
'--disable-shared'
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93dc2d |
Don't build shared libraries even if it is possible. Not all
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systems support shared libraries; you need ELF support and
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93dc2d |
diff --git a/config.make.in b/config.make.in
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index e8630a8d0ccf874d..6d43e691f7823262 100644
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--- a/config.make.in
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+++ b/config.make.in
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@@ -110,6 +110,7 @@ CFLAGS = @CFLAGS@
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CPPFLAGS-config = @CPPFLAGS@
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CPPUNDEFS = @CPPUNDEFS@
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extra-nonshared-cflags = @extra_nonshared_cflags@
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+rtld-early-cflags = @rtld_early_cflags@
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ASFLAGS-config = @ASFLAGS_config@
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AR = @AR@
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NM = @NM@
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93dc2d |
diff --git a/configure b/configure
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index e9d2b1f398c4dba0..03f4e59e754b5463 100755
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--- a/configure
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+++ b/configure
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@@ -681,6 +681,7 @@ force_install
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bindnow
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hardcoded_path_in_tests
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enable_timezone_tools
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+rtld_early_cflags
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extra_nonshared_cflags
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use_default_link
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sysheaders
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@@ -761,6 +762,7 @@ with_selinux
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93dc2d |
with_headers
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93dc2d |
with_default_link
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93dc2d |
with_nonshared_cflags
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+with_rtld_early_cflags
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enable_sanity_checks
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enable_shared
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enable_profile
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@@ -1479,6 +1481,8 @@ Optional Packages:
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--with-default-link do not use explicit linker scripts
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--with-nonshared-cflags=CFLAGS
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93dc2d |
build nonshared libraries with additional CFLAGS
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+ --with-rtld-early-cflags=CFLAGS
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+ build early initialization with additional CFLAGS
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--with-cpu=CPU select code for CPU variant
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Some influential environment variables:
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@@ -3383,6 +3387,16 @@ fi
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+# Check whether --with-rtld-early-cflags was given.
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+if test "${with_rtld_early_cflags+set}" = set; then :
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+ withval=$with_rtld_early_cflags; rtld_early_cflags=$withval
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+else
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+ rtld_early_cflags=
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+fi
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+
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+
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+
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+
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# Check whether --enable-sanity-checks was given.
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if test "${enable_sanity_checks+set}" = set; then :
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enableval=$enable_sanity_checks; enable_sanity=$enableval
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diff --git a/configure.ac b/configure.ac
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93dc2d |
index 79f6822d29ce21cf..eb9431875fae1b0e 100644
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93dc2d |
--- a/configure.ac
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93dc2d |
+++ b/configure.ac
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93dc2d |
@@ -162,6 +162,12 @@ AC_ARG_WITH([nonshared-cflags],
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93dc2d |
[extra_nonshared_cflags=$withval],
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93dc2d |
[extra_nonshared_cflags=])
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93dc2d |
AC_SUBST(extra_nonshared_cflags)
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93dc2d |
+AC_ARG_WITH([rtld-early-cflags],
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93dc2d |
+ AS_HELP_STRING([--with-rtld-early-cflags=CFLAGS],
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93dc2d |
+ [build early initialization with additional CFLAGS]),
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93dc2d |
+ [rtld_early_cflags=$withval],
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93dc2d |
+ [rtld_early_cflags=])
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93dc2d |
+AC_SUBST(rtld_early_cflags)
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93dc2d |
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93dc2d |
AC_ARG_ENABLE([sanity-checks],
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93dc2d |
AS_HELP_STRING([--disable-sanity-checks],
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93dc2d |
diff --git a/elf/Makefile b/elf/Makefile
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93dc2d |
index 52aafc89cec835ab..778e393395fc5248 100644
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93dc2d |
--- a/elf/Makefile
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93dc2d |
+++ b/elf/Makefile
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93dc2d |
@@ -152,6 +152,14 @@ CFLAGS-.o += $(call elide-stack-protector,.o,$(elide-routines.os))
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93dc2d |
CFLAGS-.op += $(call elide-stack-protector,.op,$(elide-routines.os))
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93dc2d |
CFLAGS-.os += $(call elide-stack-protector,.os,$(all-rtld-routines))
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93dc2d |
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93dc2d |
+# Add the requested compiler flags to the early startup code.
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93dc2d |
+CFLAGS-dl-printf.os += $(rtld-early-cflags)
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93dc2d |
+CFLAGS-dl-sysdep.os += $(rtld-early-cflags)
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93dc2d |
+CFLAGS-dl-tunables.os += $(rtld-early-cflags)
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93dc2d |
+CFLAGS-dl-write.os += $(rtld-early-cflags)
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93dc2d |
+CFLAGS-dl-writev.os += $(rtld-early-cflags)
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93dc2d |
+CFLAGS-rtld.os += $(rtld-early-cflags)
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93dc2d |
+
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93dc2d |
ifeq ($(unwind-find-fde),yes)
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93dc2d |
routines += unwind-dw2-fde-glibc
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93dc2d |
shared-only-routines += unwind-dw2-fde-glibc
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93dc2d |
diff --git a/manual/install.texi b/manual/install.texi
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93dc2d |
index 1320ac69b3c645f2..816b77a0a25a88a7 100644
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93dc2d |
--- a/manual/install.texi
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93dc2d |
+++ b/manual/install.texi
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93dc2d |
@@ -131,6 +131,13 @@ that the objects in @file{libc_nonshared.a} are compiled with this flag
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93dc2d |
(although this will not affect the generated code in this particular
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93dc2d |
case and potentially change debugging information and metadata only).
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93dc2d |
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93dc2d |
+@item --with-rtld-early-cflags=@var{cflags}
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93dc2d |
+Use additional compiler flags @var{cflags} to build the early startup
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93dc2d |
+code of the dynamic linker. These flags can be used to enable early
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93dc2d |
+dynamic linker diagnostics to run on CPUs which are not compatible with
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93dc2d |
+the rest of @theglibc{}, for example, due to compiler flags which target
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93dc2d |
+a later instruction set architecture (ISA).
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93dc2d |
+
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93dc2d |
@c disable static doesn't work currently
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93dc2d |
@c @item --disable-static
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93dc2d |
@c Don't build static libraries. Static libraries aren't that useful these
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