Red Hat Bugzilla – Bug 861789
Linking with -flto doesn't work.
Last modified: 2013-07-31 19:52:14 EDT
Attempting to link with arm-linux-gnu-gcc with the -flto flag fails, apparently due to attempting to use the wrong linker:
$ arm-linux-gnu-gcc -march=armv7-m -mthumb -flto -o start.bin.elf start.o
collect2: fatal error: cannot find 'ld'
Removing -flto from the command line causes the link to proceed as expected.
A fix is to add to the gcc configure command line: --with-plugin-ld=ld.
[That looks odd for a cross-compiler. But if you look in the collect2.c source, it makes the linker lookup for LTO match the non-LTO lookup:
static const char *const ld_suffix = "ld";
static const char *const plugin_ld_suffix = PLUGIN_LD;
It is possibly a gcc bug the PLUGIN_LD is defaulting to $TARGET_LD not "ld", since PLUGIN_LD is not something we're searching for in $PATH.
Setting with DEFAULT_LINKER or REAL_LD_FILE_NAME are probably other ways of fixing this. [Or just rip out the convoluted lookup mess from collect2.c and hard-wire something sensible.]
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