Add comments about ARM configure -fno-unwind-tables handling.

diff --git a/ports/ChangeLog.arm b/ports/ChangeLog.arm
index 9db0b1b..8536181 100644 (file)
--- a/ports/ChangeLog.arm
+++ b/ports/ChangeLog.arm
@@ -1,3 +1,12 @@
+2013-03-11  Joseph Myers  <joseph@codesourcery.com>
+
+       * sysdeps/arm/preconfigure.in: Add comment about
+       -fno-unwind-tables addition to CFLAGS.
+       * sysdeps/arm/preconfigure: Regenerated.
+       * sysdeps/unix/sysv/linux/arm/configure.in: Add comment about
+       -fno-unwind-tables removal from CFLAGS.
+       * sysdeps/unix/sysv/linux/arm/configure: Regenerated.
+
 2013-03-11  Roland McGrath  <roland@hack.frob.com>
 
        * sysdeps/arm/bits/setjmp.h: Test [!__ASSEMBLER__] rather than [!_ASM].

diff --git a/ports/sysdeps/arm/preconfigure b/ports/sysdeps/arm/preconfigure
index 0042aaf..7ba1749 100644 (file)
--- a/ports/sysdeps/arm/preconfigure
+++ b/ports/sysdeps/arm/preconfigure
@@ -5,6 +5,11 @@ case "$machine" in
 arm*)
   case $config_os in
   linux-gnueabi*)
+    # If the compiler enables unwind tables by default, this causes
+    # problems with undefined symbols in -nostdlib link tests.  To
+    # avoid this, add -fno-unwind-tables here and remove it in
+    # sysdeps/unix/sysv/linux/arm/configure.in after those tests have
+    # been run.
     if  "${CFLAGS+set}" != "set" ; then
       CFLAGS="-g -O2"
     fi

diff --git a/ports/sysdeps/arm/preconfigure.in b/ports/sysdeps/arm/preconfigure.in
index f3272f1..99f2128 100644 (file)
--- a/ports/sysdeps/arm/preconfigure.in
+++ b/ports/sysdeps/arm/preconfigure.in
@@ -5,6 +5,11 @@ case "$machine" in
 arm*)
   case $config_os in
   linux-gnueabi*)
+    # If the compiler enables unwind tables by default, this causes
+    # problems with undefined symbols in -nostdlib link tests.  To
+    # avoid this, add -fno-unwind-tables here and remove it in
+    # sysdeps/unix/sysv/linux/arm/configure.in after those tests have
+    # been run.
     if [ "${CFLAGS+set}" != "set" ]; then
       CFLAGS="-g -O2"
     fi

diff --git a/ports/sysdeps/unix/sysv/linux/arm/configure b/ports/sysdeps/unix/sysv/linux/arm/configure
index cb94cc5..f66b158 100644 (file)
--- a/ports/sysdeps/unix/sysv/linux/arm/configure
+++ b/ports/sysdeps/unix/sysv/linux/arm/configure
@@ -2,4 +2,5 @@
  # Local configure fragment for sysdeps/unix/sysv/linux/arm.
 
 libc_cv_gcc_unwind_find_fde=no
+# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.in.
 CFLAGS=${CFLAGS% -fno-unwind-tables}

diff --git a/ports/sysdeps/unix/sysv/linux/arm/configure.in b/ports/sysdeps/unix/sysv/linux/arm/configure.in
index 3e67dee..8fffe94 100644 (file)
--- a/ports/sysdeps/unix/sysv/linux/arm/configure.in
+++ b/ports/sysdeps/unix/sysv/linux/arm/configure.in
@@ -2,4 +2,5 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
 # Local configure fragment for sysdeps/unix/sysv/linux/arm.
 
 libc_cv_gcc_unwind_find_fde=no
+# Remove -fno-unwind-tables that was added in sysdeps/arm/preconfigure.in.
 CFLAGS=${CFLAGS% -fno-unwind-tables}