trylink: instead of build error, disable --gc-sections if GLIBC && STATIC

nameif: glibc build fixlet

diff --git a/applets/applets.c b/applets/applets.c
index 33951fa..40c4824 100644 (file)
--- a/applets/applets.c
+++ b/applets/applets.c
@@ -10,17 +10,6 @@
 #include <assert.h>
 #include "busybox.h"
 
-/* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
-#if ENABLE_STATIC && defined(__GLIBC__) && !defined(__UCLIBC__)
-#warning Static linking against glibc produces buggy executables
-#warning (glibc does not cope well with ld --gc-sections).
-#warning See sources.redhat.com/bugzilla/show_bug.cgi?id=3400
-#warning Note that glibc is unsuitable for static linking anyway.
-#warning If you still want to do it, remove -Wl,--gc-sections
-#warning from scripts/trylink and remove this warning.
-#error Aborting compilation.
-#endif
-
 #if ENABLE_BUILD_LIBBUSYBOX
 int main(int argc, char **argv)
 {

diff --git a/networking/nameif.c b/networking/nameif.c
index 66376a5..f0b8d11 100644 (file)
--- a/networking/nameif.c
+++ b/networking/nameif.c
@@ -50,7 +50,7 @@ typedef struct ethtable_s {
 #define ETHTOOL_BUSINFO_LEN 32
 /* these strings are set to whatever the driver author decides... */
 struct ethtool_drvinfo {
-       __u32 cmd;
+       uint32_t cmd;
        char  driver[32]; /* driver short name, "tulip", "eepro100" */
        char  version[32];  /* driver version string */
        char  fw_version[32]; /* firmware version string, if applicable */
@@ -58,10 +58,10 @@ struct ethtool_drvinfo {
         /* For PCI devices, use pci_dev->slot_name. */
        char  reserved1[32];
        char  reserved2[16];
-       __u32 n_stats;  /* number of u64's from ETHTOOL_GSTATS */
-       __u32 testinfo_len;
-       __u32 eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
-       __u32 regdump_len;  /* Size of data from ETHTOOL_GREGS (bytes) */
+       uint32_t n_stats;  /* number of u64's from ETHTOOL_GSTATS */
+       uint32_t testinfo_len;
+       uint32_t eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
+       uint32_t regdump_len;  /* Size of data from ETHTOOL_GREGS (bytes) */
 };
 #define ETHTOOL_GDRVINFO  0x00000003 /* Get driver info. */
 #endif

diff --git a/scripts/trylink b/scripts/trylink
index f57a8a1..283edfd 100755 (executable)
--- a/scripts/trylink
+++ b/scripts/trylink
@@ -47,13 +47,30 @@ try() {
 }
 
 check_cc() {
-    if $CC $1 -shared -o /dev/null -xc /dev/null > /dev/null 2>&1; then
-        echo "$1";
+    if $CC $1 -shared -o /dev/null -xc /dev/null >/dev/null 2>&1; then
+       echo "$1";
     else
-        echo "$2";
+       echo "$2";
     fi
 }
 
+check_libc_is_glibc() {
+    local tempname="/tmp/temp.$$.$RANDOM.c"
+    echo "\
+       #include <stdlib.h>
+       /* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
+       #if defined(__GLIBC__) && !defined(__UCLIBC__)
+       syntax error here
+       #endif
+       " >"$tempname"
+    if $CC "$tempname" -c -o /dev/null >/dev/null 2>&1; then
+       echo "$2";
+    else
+       echo "$1";
+    fi
+    rm "$tempname"
+}
+
 EXE="$1"
 CC="$2"
 LDFLAGS="$3"
@@ -64,6 +81,20 @@ LDLIBS="$6"
 # The -Wl,--sort-section option is not supported by older versions of ld
 SORT_SECTION=`check_cc "-Wl,--sort-section -Wl,alignment" ""`
 
+# 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_SECTION=`(
+. ./.config
+if test x"$CONFIG_STATIC" = x"y"; then
+    check_libc_is_glibc "" "-Wl,--gc-sections"
+else
+    echo "-Wl,--gc-sections"
+fi
+)`
+
 # Sanitize lib list (dups, extra spaces etc)
 LDLIBS=`echo "$LDLIBS" | xargs -n1 | sort | uniq | xargs`
 
@@ -76,7 +107,7 @@ try $CC $LDFLAGS \
        -o $EXE \
        -Wl,--sort-common \
        $SORT_SECTION \
-       -Wl,--gc-sections \
+       $GC_SECTION \
        -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
        $l_list \
 || {
@@ -100,7 +131,7 @@ while test "$LDLIBS"; do
                -o $EXE \
                -Wl,--sort-common \
                $SORT_SECTION \
-               -Wl,--gc-sections \
+               $GC_SECTION \
                -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
                $l_list
        if test $? = 0; then
@@ -129,7 +160,7 @@ if ! test -f busybox_ldscript; then
            -o $EXE \
            -Wl,--sort-common \
            $SORT_SECTION \
-           -Wl,--gc-sections \
+           $GC_SECTION \
            -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
            $l_list \
            -Wl,--warn-common \
@@ -151,7 +182,7 @@ else
            -o $EXE \
            -Wl,--sort-common \
            $SORT_SECTION \
-           -Wl,--gc-sections \
+           $GC_SECTION \
            -Wl,-T -Wl,busybox_ldscript \
            -Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
            $l_list \
@@ -207,7 +238,7 @@ if test "$CONFIG_FEATURE_SHARED_BUSYBOX" = y; then
            -o $EXE \
            -Wl,--sort-common \
            $SORT_SECTION \
-           -Wl,--gc-sections \
+           $GC_SECTION \
            -Wl,--start-group $O_FILES -Wl,--end-group \
            -L"$sharedlib_dir" -lbusybox \
            -Wl,--warn-common \
@@ -246,7 +277,7 @@ int main(int argc, char **argv)
                -o $EXE \
                -Wl,--sort-common \
                $SORT_SECTION \
-               -Wl,--gc-sections \
+               $GC_SECTION \
                -L"$sharedlib_dir" -lbusybox \
                -Wl,--warn-common \
        || {