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authorDenys Vlasenko2015-10-20 16:16:16 +0200
committerDenys Vlasenko2015-10-20 16:16:16 +0200
commit5134010d88b4aab286b4480822a8d8db8c32d903 (patch)
treecaa2ab5760a5f305c0566b968371cb648acf3f73 /scripts/trylink
parent76efb3ed339c9003449980d3ea4d75ce19a7c3c5 (diff)
downloadbusybox-5134010d88b4aab286b4480822a8d8db8c32d903.zip
busybox-5134010d88b4aab286b4480822a8d8db8c32d903.tar.gz
scripts/trylink: fix bit-rotted linker option verification
To that end, *make it complain* when check_cc fails on options we usually want to succeed. text data bss dec hex filename 929697 932 17692 948321 e7861 busybox-1.23.2/busybox 915361 911 17484 933756 e3f7c busybox-1.23.2.fixed/busybox 927725 932 17448 946105 e6fb9 busybox-1.24.0/busybox 913630 911 17240 931781 e37c5 busybox-1.24.0.fixed/busybox Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'scripts/trylink')
-rwxr-xr-xscripts/trylink59
1 files changed, 35 insertions, 24 deletions
diff --git a/scripts/trylink b/scripts/trylink
index 48c487b..2609997 100755
--- a/scripts/trylink
+++ b/scripts/trylink
@@ -47,18 +47,22 @@ try() {
check_cc() {
local tempname="$(mktemp)"
+ local r
+ echo "int main(int argc,char**argv){return argv?argc:0;}" >"$tempname".c
# Can use "-o /dev/null", but older gcc tend to *unlink it* on failure! :(
- # "-xc": C language. "/dev/null" is an empty source file.
- if $CC $CPPFLAGS $CFLAGS $1 -shared -xc /dev/null -o "$tempname".o >/dev/null 2>&1; then
- echo "$1";
- else
- echo "$2";
- fi
- rm -f "$tempname" "$tempname".o
+ # Was using "-xc /dev/null", but we need a valid C program.
+ # "eval" is needed because CFLAGS can contain
+ # '... -D"BB_VER=KBUILD_STR(1.N.M)" ...'
+ # and we need shell to process quotes!
+ eval $CC $CPPFLAGS $CFLAGS $1 "$tempname".c -o "$tempname" >/dev/null 2>&1
+ r=$?
+ rm -f "$tempname" "$tempname".c "$tempname".o
+ return $r
}
check_libc_is_glibc() {
local tempname="$(mktemp)"
+ local r
echo "\
#include <stdlib.h>
/* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
@@ -66,12 +70,10 @@ check_libc_is_glibc() {
syntax error here
#endif
" >"$tempname".c
- if $CC $CPPFLAGS $CFLAGS "$tempname".c -c -o "$tempname".o >/dev/null 2>&1; then
- echo "$2";
- else
- echo "$1";
- fi
- rm -f "$tempname" "$tempname".[co]
+ $CC $CPPFLAGS $CFLAGS "$tempname".c -c -o "$tempname".o >/dev/null 2>&1
+ r=$?
+ rm -f "$tempname" "$tempname".c "$tempname".o
+ return $r
}
EXE="$1"
@@ -83,32 +85,41 @@ A_FILES="$6"
LDLIBS="$7"
# The --sort-section option is not supported by older versions of ld
-SORT_SECTION=`check_cc "-Wl,--sort-section,alignment" ""`
+SORT_SECTION="-Wl,--sort-section,alignment"
+if ! check_cc "-Wl,--sort-section,alignment"; then
+ echo "Your linker does not support --sort-section,alignment"
+ SORT_SECTION=""
+fi
START_GROUP="-Wl,--start-group"
END_GROUP="-Wl,--end-group"
INFO_OPTS="-Wl,--warn-common -Wl,-Map,$EXE.map -Wl,--verbose"
# gold may not support --sort-common (yet)
-SORT_COMMON=`check_cc "-Wl,--sort-common" ""`
+SORT_COMMON="-Wl,--sort-common"
+if ! check_cc "-Wl,--sort-common"; then
+ echo "Your linker does not support --sort-common"
+ SORT_COMMON=""
+fi
# Static linking against glibc produces buggy executables
# (glibc does not cope well with ld --gc-sections).
# See sources.redhat.com/bugzilla/show_bug.cgi?id=3400
# Note that glibc is unsuitable for static linking anyway.
# We are removing -Wl,--gc-sections from link command line.
-GC_SECTIONS=`(
-. ./.config
-if test x"$CONFIG_STATIC" = x"y"; then
- check_libc_is_glibc "" "-Wl,--gc-sections"
-else
- echo "-Wl,--gc-sections"
+GC_SECTIONS="-Wl,--gc-sections"
+if (. ./.config && test x"$CONFIG_STATIC" = x"y") then
+ if check_libc_is_glibc; then
+ echo "Static linking against glibc, can't use --gc-sections"
+ GC_SECTIONS=""
+ fi
fi
-)`
-
# The --gc-sections option is not supported by older versions of ld
if test -n "$GC_SECTIONS"; then
- GC_SECTIONS=`check_cc "$GC_SECTIONS" ""`
+ if ! check_cc "$GC_SECTIONS"; then
+ echo "Your linker does not support $GC_SECTIONS"
+ GC_SECTIONS=""
+ fi
fi
# Sanitize lib list (dups, extra spaces etc)