Disable canonical prefixes of system headers
GCC know a few pre-defined paths (relative to its location) to
search for headers, libraries, program, etc. By default GCC prefixes
its own path(argv[0]) and calls realpath() which result in absolute
path with all symlink, . and .. removed.
It's usually good to have canonicalised paths, but absolute paths
in *.d file can cause unnecessary relinking when stale entries
in ccache cache hit
Add -no-canonical-prefixes (gcc>=4.6) and
-fno-canonical-system-headers (gcc>4.6) to disable realpath() on
prefixed paths
Change-Id: I58d739e61fb013015fb05a9c98b2132b307f915a
diff --git a/core/combo/HOST_linux-x86.mk b/core/combo/HOST_linux-x86.mk
index 85d536b..1472849 100644
--- a/core/combo/HOST_linux-x86.mk
+++ b/core/combo/HOST_linux-x86.mk
@@ -52,7 +52,8 @@
endif # BUILD_HOST_static
HOST_GLOBAL_CFLAGS += -fPIC \
- -include $(call select-android-config-h,linux-x86)
+ -no-canonical-prefixes \
+ -include $(call select-android-config-h,linux-x86)
# Disable new longjmp in glibc 2.11 and later. See bug 2967937.
HOST_GLOBAL_CFLAGS += -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0
diff --git a/core/combo/TARGET_linux-arm.mk b/core/combo/TARGET_linux-arm.mk
index 81d0813..8c8a01a 100644
--- a/core/combo/TARGET_linux-arm.mk
+++ b/core/combo/TARGET_linux-arm.mk
@@ -103,6 +103,8 @@
-Werror=format-security \
-D_FORTIFY_SOURCE=2 \
-fno-short-enums \
+ -no-canonical-prefixes \
+ -fno-canonical-system-headers \
$(arch_variant_cflags) \
-include $(android_config_h) \
-I $(dir $(android_config_h))
diff --git a/core/combo/TARGET_linux-arm64.mk b/core/combo/TARGET_linux-arm64.mk
index 5e50f9f..6515eb5 100644
--- a/core/combo/TARGET_linux-arm64.mk
+++ b/core/combo/TARGET_linux-arm64.mk
@@ -87,6 +87,8 @@
-Werror=format-security \
-D_FORTIFY_SOURCE=2 \
-fno-short-enums \
+ -no-canonical-prefixes \
+ -fno-canonical-system-headers \
$(arch_variant_cflags) \
-include $(android_config_h) \
-I $(dir $(android_config_h))
diff --git a/core/combo/TARGET_linux-mips.mk b/core/combo/TARGET_linux-mips.mk
index 1250767..015d46b 100644
--- a/core/combo/TARGET_linux-mips.mk
+++ b/core/combo/TARGET_linux-mips.mk
@@ -90,6 +90,8 @@
-Wa,--noexecstack \
-Werror=format-security \
-D_FORTIFY_SOURCE=2 \
+ -no-canonical-prefixes \
+ -fno-canonical-system-headers \
$(arch_variant_cflags) \
-include $(android_config_h) \
-I $(dir $(android_config_h))
diff --git a/core/combo/TARGET_linux-mips64.mk b/core/combo/TARGET_linux-mips64.mk
index 2130d03..a7b03b2 100644
--- a/core/combo/TARGET_linux-mips64.mk
+++ b/core/combo/TARGET_linux-mips64.mk
@@ -95,6 +95,8 @@
-Wa,--noexecstack \
-Werror=format-security \
-D_FORTIFY_SOURCE=2 \
+ -no-canonical-prefixes \
+ -fno-canonical-system-headers \
$(arch_variant_cflags) \
-include $(android_config_h) \
-I $(dir $(android_config_h))
diff --git a/core/combo/TARGET_linux-x86.mk b/core/combo/TARGET_linux-x86.mk
index 4f66765..4ebcd93 100644
--- a/core/combo/TARGET_linux-x86.mk
+++ b/core/combo/TARGET_linux-x86.mk
@@ -122,6 +122,8 @@
-fstack-protector \
-m32 \
-msse2 \
+ -no-canonical-prefixes \
+ -fno-canonical-system-headers \
-include $(android_config_h) \
-I $(dir $(android_config_h))
diff --git a/core/combo/TARGET_linux-x86_64.mk b/core/combo/TARGET_linux-x86_64.mk
index 42953ae..ee6c6e2 100644
--- a/core/combo/TARGET_linux-x86_64.mk
+++ b/core/combo/TARGET_linux-x86_64.mk
@@ -120,7 +120,9 @@
-funswitch-loops \
-funwind-tables \
-fstack-protector \
- -m64
+ -m64 \
+ -no-canonical-prefixes \
+ -fno-canonical-system-headers
# Help catch common 32/64-bit errors.
TARGET_GLOBAL_CFLAGS += \