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build: test for support of -flto compiler flag

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... and prepend the $ld_gc_flags instead of appending to the $CFLAGS.
This commit is contained in:
Thomas Haller 2017-02-10 12:22:21 +01:00
parent a981c6c355
commit 923c52ffbb
1 changed files with 8 additions and 3 deletions
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11
m4/compiler_options.m4
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@ -128,9 +128,14 @@ fi
AC_DEFUN([NM_LTO],
[AC_ARG_ENABLE(lto, AS_HELP_STRING([--enable-lto], [Enable Link Time Optimization for smaller size (default: no)]))
if (test "${enable_lto}" = "yes"); then
CFLAGS="-flto $CFLAGS"
CC_CHECK_FLAG_APPEND([lto_flags], [CFLAGS], [-flto])
if (test -n "${lto_flags}"); then
CFLAGS="-flto $CFLAGS"
else
AC_MSG_ERROR([Link Time Optimization -flto is not supported.])
fi
else
enable_lto='no'
enable_lto='no'
fi
])
@ -140,7 +145,7 @@ if (test "${enable_ld_gc}" != "no"); then
CC_CHECK_FLAG_APPEND([ld_gc_flags], [CFLAGS], [-fdata-sections -ffunction-sections -Wl,--gc-sections])
if (test -n "${ld_gc_flags}"); then
enable_ld_gc="yes"
CFLAGS="$CFLAGS $ld_gc_flags"
CFLAGS="$ld_gc_flags $CFLAGS"
else
if (test "${enable_ld_gc}" = "yes"); then
AC_MSG_ERROR([Unused symbol eviction requested but not supported.])