Make using non-default as/ld/etc easier.

Message ID 20210907074119.1369002-1-galibert@pobox.com
State New
Headers show
Series
  • Make using non-default as/ld/etc easier.
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Commit Message

H.J. Lu via Libc-alpha Sept. 7, 2021, 7:41 a.m.
Add the configure parameters
{AS,LD,AR,OBJDUMP,OBJCOPY,GPROF}=path to optionally force the
path for these programs without having to tweak the output of
$CC -print-prog-name in some way.

In addition, when {AS,LD}=... is used the corresponding program
version is not check.  The user gets to keep all the pieces if it
blows.

In practice, according to a build log on x86-64, $AS and $LD are never
used directly.  $AR, $OBJDUMP and $OBJCOPY are though, and the llvm
variants don't seem to have any issue.

v2: Use variable assignments instead of --with-xxx
v3: Denitsify
v4: Sync with 224edada607ebc6aaa1aadaae423128fae7880df

Signed-off-by: Olivier Galibert <galibert@pobox.com>

---
 aclocal.m4   | 41 +++++++++++++++++++++++-------
 configure    | 72 ++++++++++++++++++++++++++++++++++++++++------------
 configure.ac | 22 +++++++++-------
 3 files changed, 101 insertions(+), 34 deletions(-)

-- 
2.33.0

Patch

diff --git a/aclocal.m4 b/aclocal.m4
index c195c4db56..6852875469 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -110,19 +110,42 @@  rm -fr contest*])
 AC_DEFUN([LIBC_PROG_BINUTILS],
 [# Was a --with-binutils option given?
 if test -n "$path_binutils"; then
-    # Make absolute; ensure a single trailing slash.
-    path_binutils=`(cd $path_binutils; pwd) | sed 's%/*$%/%'`
-    CC="$CC -B$path_binutils"
+  # Make absolute; ensure a single trailing slash.
+  path_binutils=`(cd $path_binutils; pwd) | sed 's%/*$%/%'`
+  CC="$CC -B$path_binutils"
 fi
-AS=`$CC -print-prog-name=as`
-LD=`$CC -print-prog-name=ld`
-AR=`$CC -print-prog-name=ar`
+check_as_version=0
+AC_ARG_VAR([AS], [as program to use])
+if test -z "$AS"; then
+  AS=`$CC -print-prog-name=as`
+  check_as_version=1
+fi
+check_ld_version=0
+AC_ARG_VAR([LD], [ld program to use])
+if test -z "$LD"; then
+  LD=`$CC -print-prog-name=ld`
+  check_ld_version=1
+fi
+AC_ARG_VAR([AR], [ar program to use])
+if test -z "$AR"; then
+  AR=`$CC -print-prog-name=ar`
+fi
+AC_ARG_VAR([OBJDUMP], [objdump program to use])
+if test -z "$OBJDUMP"; then
+  OBJDUMP=`$CC -print-prog-name=objdump`
+fi
+AC_ARG_VAR([OBJCOPY], [objcopy program to use])
+if test -z "$OBJCOPY"; then
+  OBJCOPY=`$CC -print-prog-name=objcopy`
+fi
+AC_ARG_VAR([GPROF], [gprof program to use])
+if test -z "$GPROF"; then
+  GPROF=`$CC -print-prog-name=gprof`
+fi
+
 AC_SUBST(AR)
-OBJDUMP=`$CC -print-prog-name=objdump`
 AC_SUBST(OBJDUMP)
-OBJCOPY=`$CC -print-prog-name=objcopy`
 AC_SUBST(OBJCOPY)
-GPROF=`$CC -print-prog-name=gprof`
 AC_SUBST(GPROF)
 
 # Determine whether we are using GNU binutils.
diff --git a/configure b/configure
index 542802ad35..45dec1e621 100755
--- a/configure
+++ b/configure
@@ -651,12 +651,12 @@  SED
 MAKEINFO
 MSGFMT
 MAKE
-LD
-AS
 GPROF
 OBJCOPY
 OBJDUMP
 AR
+LD
+AS
 LN_S
 INSTALL_DATA
 INSTALL_SCRIPT
@@ -805,7 +805,13 @@  CPPFLAGS
 CPP
 CXX
 CXXFLAGS
-CCC'
+CCC
+AS
+LD
+AR
+OBJDUMP
+OBJCOPY
+GPROF'
 ac_subdirs_all=''
 
 # Initialize some variables set by options.
@@ -1495,6 +1501,12 @@  Some influential environment variables:
   CPP         C preprocessor
   CXX         C++ compiler command
   CXXFLAGS    C++ compiler flags
+  AS          as program to use
+  LD          ld program to use
+  AR          ar program to use
+  OBJDUMP     objdump program to use
+  OBJCOPY     objcopy program to use
+  GPROF       gprof program to use
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@@ -4545,19 +4557,42 @@  fi
 
 # Was a --with-binutils option given?
 if test -n "$path_binutils"; then
-    # Make absolute; ensure a single trailing slash.
-    path_binutils=`(cd $path_binutils; pwd) | sed 's%/*$%/%'`
-    CC="$CC -B$path_binutils"
+  # Make absolute; ensure a single trailing slash.
+  path_binutils=`(cd $path_binutils; pwd) | sed 's%/*$%/%'`
+  CC="$CC -B$path_binutils"
 fi
-AS=`$CC -print-prog-name=as`
-LD=`$CC -print-prog-name=ld`
-AR=`$CC -print-prog-name=ar`
+check_as_version=0
+
+if test -z "$AS"; then
+  AS=`$CC -print-prog-name=as`
+  check_as_version=1
+fi
+check_ld_version=0
+
+if test -z "$LD"; then
+  LD=`$CC -print-prog-name=ld`
+  check_ld_version=1
+fi
+
+if test -z "$AR"; then
+  AR=`$CC -print-prog-name=ar`
+fi
+
+if test -z "$OBJDUMP"; then
+  OBJDUMP=`$CC -print-prog-name=objdump`
+fi
+
+if test -z "$OBJCOPY"; then
+  OBJCOPY=`$CC -print-prog-name=objcopy`
+fi
+
+if test -z "$GPROF"; then
+  GPROF=`$CC -print-prog-name=gprof`
+fi
+
 
-OBJDUMP=`$CC -print-prog-name=objdump`
 
-OBJCOPY=`$CC -print-prog-name=objcopy`
 
-GPROF=`$CC -print-prog-name=gprof`
 
 
 # Determine whether we are using GNU binutils.
@@ -4599,8 +4634,8 @@  $as_echo "$libc_cv_prog_ld_gnu" >&6; }
 gnu_ld=$libc_cv_prog_ld_gnu
 
 
-# Accept binutils 2.25 or newer.
-for ac_prog in $AS
+if test $check_as_version = 1; then :
+  for ac_prog in $AS
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -4660,10 +4695,12 @@  $as_echo_n "checking version of $AS... " >&6; }
 $as_echo "$ac_prog_version" >&6; }
 fi
 if test $ac_verc_fail = yes; then
-  AS=: critic_missing="$critic_missing as"
+  AS=: critic_missing="$critic_missing GNU as"
 fi
 
 
+fi
+
 libc_cv_with_lld=no
 case $($LD --version) in
   "GNU gold"*)
@@ -4800,7 +4837,8 @@  fi
     libc_cv_with_lld=yes
     ;;
   *)
-    for ac_prog in $LD
+    if test $check_ld_version = 1; then :
+  for ac_prog in $LD
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -4863,6 +4901,8 @@  if test $ac_verc_fail = yes; then
   LD=: critic_missing="$critic_missing GNU ld"
 fi
 
+
+fi
     ;;
 esac
 config_vars="$config_vars
diff --git a/configure.ac b/configure.ac
index d9232418de..f4ab9664ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -989,11 +989,13 @@  AC_PROG_LN_S
 
 LIBC_PROG_BINUTILS
 
-# Accept binutils 2.25 or newer.
-AC_CHECK_PROG_VER(AS, $AS, --version,
-		  [GNU assembler.* \([0-9]*\.[0-9.]*\)],
-		  [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
-		  AS=: critic_missing="$critic_missing as")
+dnl Accept binutils 2.25 or newer.  Don't check version if the path is forced.
+AS_IF([test $check_as_version = 1],
+  [AC_CHECK_PROG_VER(AS, $AS, --version,
+		    [GNU assembler.* \([0-9]*\.[0-9.]*\)],
+		    [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
+		    AS=: critic_missing="$critic_missing GNU as")
+])
 
 libc_cv_with_lld=no
 case $($LD --version) in
@@ -1013,10 +1015,12 @@  case $($LD --version) in
     libc_cv_with_lld=yes
     ;;
   *)
-    AC_CHECK_PROG_VER(LD, $LD, --version,
-		    [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
-		    [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
-		    LD=: critic_missing="$critic_missing GNU ld")
+    AS_IF([test $check_ld_version = 1],
+      [AC_CHECK_PROG_VER(LD, $LD, --version,
+			[GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
+			[2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
+			LD=: critic_missing="$critic_missing GNU ld")
+    ])
     ;;
 esac
 LIBC_CONFIG_VAR([with-lld], [$libc_cv_with_lld])