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configure.ac: link test for -fstack-protector-all

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There are (broken) compilers out there that accept -fstack-protector-*
parameters, but do not provide the needed ssp library. As a result,
build does not fail, but link does. Use the local check_link_flag
autoconf function to correctly test for SSP availability.

Required for the Imagination Technologies Codescape IMG MIPS
toolchain, version 2015.10 (and who knows what else).

Fixes #744.
This commit is contained in:
Baruch Siach
2016-04-05 15:24:55 +03:00
committed by John Hood
parent 2ba5d2bbb2
commit 7196dfdb26
1 changed files with 1 additions and 1 deletions
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configure.ac
+1 -1
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@@ -93,7 +93,7 @@ AS_IF([test x"$hardening" != x"no"], [
# This one will likely succeed, even on platforms where it does nothing.
check_cc_cxx_flag([-D_FORTIFY_SOURCE=2], [HARDEN_CFLAGS="$HARDEN_CFLAGS -D_FORTIFY_SOURCE=2"])
check_cc_cxx_flag([-fstack-protector-all],
check_link_flag([-fstack-protector-all],
[HARDEN_CFLAGS="$HARDEN_CFLAGS -fstack-protector-all"
check_cc_cxx_flag([-Wstack-protector], [HARDEN_CFLAGS="$HARDEN_CFLAGS -Wstack-protector"],
[], [-fstack-protector-all])