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Rewrite linker check based on linker verbose output

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This commit is contained in:
hmelder 2023-10-28 14:04:01 +02:00
parent 3ff4ee8a05
commit 44156636d1
1 changed files with 32 additions and 23 deletions
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55
m4/gs_check_abi20_linker.m4
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@ -7,27 +7,36 @@
# This macro checks whether we are using a linker that has known problems with the gnustep-2.0 ABI.
# If so, we currently just print a warning because we don't have a 100% accurate way of checking yet.
#
AC_DEFUN([GS_CHECK_ABI20_LINKER], [dnl
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_PROG_GREP])
AC_CACHE_CHECK([for an gnustep-2.0 ABI compatible linker],[gs_cv_abi20_linker], [dnl
gs_cv_abi20_linker="unknown"
AS_VAR_PUSHDEF([LD], [gs_cv_abi20_linker_prog])
LD=$($CC --print-prog-name=ld)
if $LD --version | $GREP -q 'GNU ld'; then
gs_cv_abi20_linker="unlikely (GNU ld)"
elif $LD --version | $GREP -q 'GNU gold'; then
gs_cv_abi20_linker="yes (GNU gold)"
elif $LD --version | $GREP -q 'LLD'; then
gs_cv_abi20_linker="yes (LLD)"
fi
AS_VAR_POPDEF([LD])
])
if echo "$gs_cv_abi20_linker" | $GREP -q '^yes'; then
_gs_abi20_linker=yes
else
_gs_abi20_linker=no
AC_MSG_WARN([The detected linker might not produce working Objective-C binaries using the gnustep-2.0 ABI. Consider using gold or LLD.])
fi
AS_VAR_IF([_gs_abi20_linker], ["yes"], [$1], [$2])
AC_DEFUN([GS_CHECK_ABI20_LINKER], [
AC_MSG_CHECKING([which linker is being used])
# Write a simple test program to a file.
echo 'int main() { return 0; }' > conftest.c
# Try compiling with verbose output to capture linker information.
$CC $CFLAGS $LDFLAGS -o conftest conftest.c -Wl,--verbose > compile.log 2>&1
# Determine which linker is being used based on the log.
linker="unknown" # Default to unknown.
if grep -q "GNU ld" compile.log; then
linker="GNU ld"
# GNU gold does not print a header line, so we just check for "gold".
elif grep -q "gold" compile.log; then
linker="GNU gold"
# LLD does not print a header line, so we just check for "lld".
elif grep -q "lld" compile.log; then
linker="lld"
fi
AC_MSG_RESULT([$linker])
# Clean up the test artifacts.
rm -f conftest.c conftest
# Based on the identified linker, we may want to display a warning or take other actions.
if test "x$linker" = "xGNU ld"; then
AC_MSG_WARN([The detected linker (GNU ld) might not produce working Objective-C binaries using the gnustep-2.0 ABI. Consider using GNU gold or LLD.])
elif test "x$linker" = "xunknown" && test -n "$explicit_linker_flag"; then
AC_MSG_WARN([Unable to confirm if the explicitly specified linker '$explicit_linker_flag' is compatible with the gnustep-2.0 ABI.])
fi
])