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trylink: instead of build error, disable --gc-sections if GLIBC && STATIC
nameif: glibc build fixlet
This commit is contained in:
Denis Vlasenko
parent
ddc865fb0d
commit
3f9c848576
@ -10,17 +10,6 @@
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#include <assert.h>
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#include "busybox.h"
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/* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
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#if ENABLE_STATIC && defined(__GLIBC__) && !defined(__UCLIBC__)
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#warning Static linking against glibc produces buggy executables
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#warning (glibc does not cope well with ld --gc-sections).
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#warning See sources.redhat.com/bugzilla/show_bug.cgi?id=3400
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#warning Note that glibc is unsuitable for static linking anyway.
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#warning If you still want to do it, remove -Wl,--gc-sections
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#warning from scripts/trylink and remove this warning.
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#error Aborting compilation.
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#endif
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#if ENABLE_BUILD_LIBBUSYBOX
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int main(int argc, char **argv)
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{
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@ -50,7 +50,7 @@ typedef struct ethtable_s {
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#define ETHTOOL_BUSINFO_LEN 32
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/* these strings are set to whatever the driver author decides... */
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struct ethtool_drvinfo {
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__u32 cmd;
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uint32_t cmd;
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char driver[32]; /* driver short name, "tulip", "eepro100" */
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char version[32]; /* driver version string */
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char fw_version[32]; /* firmware version string, if applicable */
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@ -58,10 +58,10 @@ struct ethtool_drvinfo {
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/* For PCI devices, use pci_dev->slot_name. */
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char reserved1[32];
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char reserved2[16];
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__u32 n_stats; /* number of u64's from ETHTOOL_GSTATS */
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__u32 testinfo_len;
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__u32 eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
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__u32 regdump_len; /* Size of data from ETHTOOL_GREGS (bytes) */
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uint32_t n_stats; /* number of u64's from ETHTOOL_GSTATS */
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uint32_t testinfo_len;
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uint32_t eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
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uint32_t regdump_len; /* Size of data from ETHTOOL_GREGS (bytes) */
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};
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#define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
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#endif
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@ -47,13 +47,30 @@ try() {
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}
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check_cc() {
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if $CC $1 -shared -o /dev/null -xc /dev/null > /dev/null 2>&1; then
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if $CC $1 -shared -o /dev/null -xc /dev/null >/dev/null 2>&1; then
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echo "$1";
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else
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echo "$2";
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fi
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}
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check_libc_is_glibc() {
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local tempname="/tmp/temp.$$.$RANDOM.c"
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echo "\
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#include <stdlib.h>
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/* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
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#if defined(__GLIBC__) && !defined(__UCLIBC__)
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syntax error here
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#endif
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" >"$tempname"
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if $CC "$tempname" -c -o /dev/null >/dev/null 2>&1; then
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echo "$2";
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else
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echo "$1";
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fi
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rm "$tempname"
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}
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EXE="$1"
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CC="$2"
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LDFLAGS="$3"
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@ -64,6 +81,20 @@ LDLIBS="$6"
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# The -Wl,--sort-section option is not supported by older versions of ld
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SORT_SECTION=`check_cc "-Wl,--sort-section -Wl,alignment" ""`
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# Static linking against glibc produces buggy executables
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# (glibc does not cope well with ld --gc-sections).
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# See sources.redhat.com/bugzilla/show_bug.cgi?id=3400
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# Note that glibc is unsuitable for static linking anyway.
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# We are removing -Wl,--gc-sections from link command line.
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GC_SECTION=`(
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. ./.config
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if test x"$CONFIG_STATIC" = x"y"; then
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check_libc_is_glibc "" "-Wl,--gc-sections"
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else
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echo "-Wl,--gc-sections"
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fi
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)`
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# Sanitize lib list (dups, extra spaces etc)
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LDLIBS=`echo "$LDLIBS" | xargs -n1 | sort | uniq | xargs`
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@ -76,7 +107,7 @@ try $CC $LDFLAGS \
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-o $EXE \
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-Wl,--sort-common \
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$SORT_SECTION \
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-Wl,--gc-sections \
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$GC_SECTION \
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-Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
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$l_list \
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@ -100,7 +131,7 @@ while test "$LDLIBS"; do
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-o $EXE \
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-Wl,--sort-common \
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$SORT_SECTION \
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-Wl,--gc-sections \
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$GC_SECTION \
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-Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
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$l_list
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if test $? = 0; then
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@ -129,7 +160,7 @@ if ! test -f busybox_ldscript; then
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-o $EXE \
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-Wl,--sort-common \
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$SORT_SECTION \
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-Wl,--gc-sections \
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$GC_SECTION \
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-Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
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$l_list \
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-Wl,--warn-common \
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@ -151,7 +182,7 @@ else
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-o $EXE \
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-Wl,--sort-common \
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$SORT_SECTION \
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-Wl,--gc-sections \
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$GC_SECTION \
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-Wl,-T -Wl,busybox_ldscript \
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-Wl,--start-group $O_FILES $A_FILES -Wl,--end-group \
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$l_list \
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@ -207,7 +238,7 @@ if test "$CONFIG_FEATURE_SHARED_BUSYBOX" = y; then
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-o $EXE \
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-Wl,--sort-common \
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$SORT_SECTION \
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-Wl,--gc-sections \
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$GC_SECTION \
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-Wl,--start-group $O_FILES -Wl,--end-group \
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-L"$sharedlib_dir" -lbusybox \
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-Wl,--warn-common \
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@ -246,7 +277,7 @@ int main(int argc, char **argv)
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-o $EXE \
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-Wl,--sort-common \
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$SORT_SECTION \
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-Wl,--gc-sections \
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$GC_SECTION \
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-L"$sharedlib_dir" -lbusybox \
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-Wl,--warn-common \
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|| {
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